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In the industrial production process, the role of the filter cannot be ignored. In order to improve production efficiency and product quality, a leading filtration solution provider recently launched an innovative filter product - High Low Nozzle Overlapping Basket Filter.Insulation Filter High Low Nozzle Overlapping Basket Filter is a brand-new filter design, aiming to solve the problem that traditional filters are easy to clog when dealing with high-concentration suspended solids. The filter adopts the combination of specially designed nozzle and basket filter, which can maintain a good filtering effect in the case of high concentration of suspended solids.Y Strainer Stainless Traditional filters often face the problem of clogging when dealing with high-concentration suspended solids, resulting in low production efficiency and increased equipment maintenance costs. The High Low nozzle overlaps the basket filter through the design of the nozzle, which can evenly disperse the suspended matter to each area of the basket filter, thus avoiding the problem of clogging. At the same time, the filter also adopts the overlapping design of high and low nozzles, so that the suspended solids form a vortex flow in the filter, which further improves the filtering effect.Y-Type Insulation Filter High Low nozzle overlapping basket filter not only has a breakthrough in filtering effect, but also provides a more convenient solution for cleaning and maintenance. When cleaning the traditional filter, the whole filter needs to be disassembled, but the design of the High Low nozzle overlapping the basket filter makes cleaning easier, just remove the nozzle part for cleaning, which greatly saves time and labor costs. The filter is suitable for various industrial fields, such as chemical industry, food processing, pharmaceutical and so on. In the field of chemical industry, it can effectively filter solid particles in various chemical substances to improve product purity; in the field of food processing, it can filter impurities suspended in liquid to ensure product safety and hygiene. The launch of the High Low nozzle overlapping basket filter will bring more efficient filtration solutions to the industrial field, improving production efficiency and product quality. With the continuous development of industrial technology, we believe that this innovative filter design will be more widely used in the future.

Recently, a new type of valve called a plug valve has been successfully developed and put into the market, attracting widespread attention in the industry. It is understood that the plug valve is a new type of fluid control valve, characterized by a wide range of flow regulation, good sealing, and long service life. Compared with traditional globe valves and regulating valves, the flow regulation of plug valves is more precise and can meet the flow requirements under different working conditions. In addition, the plug valve also adopts a new sealing structure, which can effectively prevent leakage and improve the safety performance of the valve. At the same time, the valve has a long service life, low maintenance costs, and can bring greater economic benefits to users. According to relevant sources, during the research and development process of the plug valve, the team overcame many technical difficulties, continuously tested and optimized, and ultimately successfully developed this new valve with independent intellectual property rights. At present, plug valves have been widely used in various fields, including petrochemical, power, metallurgy, water treatment, and other industries. In the future, plug valves are expected to become one of the important products in the field of fluid control, injecting new impetus into the development of the industry.

Recently, the municipal department announced that it will close a number of valves in the urban area to ensure the safety of urban water supply. It is reported that these closed valves are located on the main water supply pipelines in the urban area, and the closure will have a certain impact on the water use of some residents. But the municipal department said that closing these valves is to better maintain the safety of the city's water supply system to avoid pipe bursts, water leaks and other problems. The city department also stated that closing these valves is a necessary measure, and also appealed for the understanding and support of citizens. The city will notify residents well in advance of the closure and try to minimize the impact as much as possible. It is understood that these closed valves will be closed one after another in the near future, and the closing time is expected to range from a few days to a few weeks. The council will be keeping a close eye on the operation of the water system and address any issues promptly. The move to close the valve has received widespread support from the public. Citizens said that although closing the valve would have some impact on their own water use, they were willing to make certain sacrifices in order to ensure the safety of the city's water supply system. At the same time, the citizens also called on the municipal departments to strengthen the maintenance and management of the urban water supply system to ensure the safety of water for the citizens.

Recently, a well-known water treatment equipment manufacturer launched a brand new forced circulation pump valve, which will bring revolutionary changes to the water treatment industry. It is reported that this forced circulation pump valve adopts advanced control technology, which can accurately control the water flow in the water treatment process, so as to ensure the stability and consistency of water quality. At the same time, the product also has the characteristics of high efficiency and energy saving, which can effectively reduce energy consumption and operating costs in the water treatment process. In addition, this forced circulation pump valve also has the characteristics of intelligence, which can be connected to the Internet to realize remote monitoring and control of equipment, so as to conduct equipment management and maintenance more conveniently and quickly. According to the relevant person in charge of the water treatment equipment manufacturer, this forced circulation pump valve has passed strict tests and verifications, and has been widely used in many water treatment projects, and has achieved good results and reputation. The forced circulation pump valve launched this time will bring more efficient, intelligent and energy-saving equipment solutions to the water treatment industry, making important contributions to the development and progress of the industry.

Intelligent self-priming pump is an innovative product that combines advanced technology and traditional engineering technology. It adopts a self-developed intelligent control system, which can automatically monitor water level, control water flow, realize self-priming, drainage and other functions, and is widely used in urban construction, agricultural irrigation, industrial production and other fields. Recently, a well-known domestic pump company launched a brand new intelligent self-priming pump product. The product adopts a high-efficiency and energy-saving motor, which has the characteristics of low noise, low vibration, and long life, which can greatly reduce energy consumption and maintenance costs. At the same time, the product is also equipped with an intelligent controller, which can realize remote control and monitoring, so that users can keep track of the operation status of the pumping station at any time. It is understood that the intelligent self-priming pump product has been widely used in many projects. In a newly built city park, the pumping station realizes automatic management through an intelligent control system, which not only saves labor costs, but also automatically adjusts the water level according to the weather conditions to ensure clear water quality and pleasant scenery of the lake in the park. In a chemical company, the pumping station achieved an efficient production process by automatically monitoring and controlling water flow, improving production efficiency and quality. According to the relevant person in charge, intelligent self-priming pumps are the development trend of the pump industry in the future and will be applied in more fields. The company will continue to increase investment in research and development, continuously improve product quality and technical content, and provide users with better products and services.

Recently, a new type of valve product called thermal insulation ball valve has attracted widespread attention in the market. This valve adopts advanced insulation material and design, which can effectively reduce the temperature loss of the pipeline and improve the energy utilization efficiency of the pipeline. It is understood that the thermal insulation ball valve adopts a double-layer sphere structure, and the inner sphere and the outer sphere are filled with high-efficiency thermal insulation materials, which can effectively reduce the heat loss of the pipeline. At the same time, the valve is also equipped with advanced sealing structure and fluid control system, which can ensure the stability and flow control performance of the valve. The valve is suitable for various pipelines with high temperature, high pressure and corrosive medium, and is widely used in petroleum, chemical industry, electric power, metallurgy and other fields. Compared with traditional valves, thermal insulation ball valves not only have better thermal insulation performance and flow control performance, but also are more durable and reliable, which can greatly reduce the cost of pipeline maintenance and replacement. It is reported that the product has passed a number of national and industry standard certifications, and has been widely recognized and praised by the market. In the future, thermal insulation ball valves will continue to be continuously optimized and upgraded to provide users with more efficient and reliable pipeline control solutions.

Recently, a new type of centrifugal self-priming pump has attracted widespread attention in the market. This pump has a self-priming function, does not require an additional suction line, and can quickly draw liquid into the pump body and deliver it. It is understood that this centrifugal self-priming pump adopts advanced turbine blade design, which makes a high-speed rotating vortex inside the pump body, thereby generating negative pressure and quickly sucking liquid into the pump body. At the same time, the centrifugal impeller inside the pump body quickly pushes the liquid to the outlet, realizing efficient delivery. The pump has the advantages of compact structure, small volume, low noise, etc., and is suitable for liquid transportation in various occasions. Especially in some occasions that need self-priming function, such as sewage treatment, agricultural irrigation and other fields, the pump has shown good performance. According to a user who uses the pump, the self-priming function of the pump is very convenient, no additional suction pipeline is needed, and the liquid can be directly pumped into the pump body for delivery, which greatly saves installation and operation costs. The introduction of the centrifugal self-priming pump will bring new options to the field of liquid transportation, improve the efficiency and convenience of liquid transportation, and is expected to become a new trend in the field of liquid transportation.

Recently, a well-known manufacturer launched a new high-temperature magnetic pump, which can operate stably at temperatures up to 500°C, filling the gap in the high-temperature magnetic pump market. It is understood that the high-temperature magnetic pump uses advanced ceramic materials and high-temperature alloy materials, which have excellent high-temperature resistance and corrosion resistance. At the same time, the product also adopts a fully enclosed structure design to avoid medium leakage in the pump body and ensure the safety and stability of the production process. The launch of the high-temperature magnetic pump will provide more reliable and efficient fluid delivery equipment for production in the high-temperature industrial field, and is expected to become a new favorite in this field. At the same time, the manufacturer also stated that it will continue to increase research and development efforts and launch more high-performance magnetic pump products to bring more convenience and benefits to industrial production. According to industry analysis, with the continuous development and upgrading of industrial production, the demand for high-temperature magnetic pumps will increase day by day, and the launch of new products from this manufacturer is expected to occupy a place in the market.

The flow control valve is used to control the flow of liquid in the hydraulic system, so as to control the movement speed of the actuator. Flow valves include throttle valve, speed control valve, overflow throttle valve, diverter collector valve and single steady flow valve, etc. Common faults of flow control valve The characteristic of the flow control valve is to control the flow of oil by changing the size of the orifice (throttle gap) under a certain pressure difference, and to ensure smooth operation. This type of valve generally has a higher failure rate in the low-speed and small-flow adjustment section, because the low-speed section has a small orifice, is sensitive to the cleanliness of the oil, and has strict requirements on the internal structure and base sealing. And the speed adjustment is required to be stable. The common faults of flow control valve mainly include flow regulation failure, unstable flow and too large internal leakage. The main reason is that the radial clamping of the spool and the failure of the adjusting device, the oil is not clean, the installation is improper, the tightening of the screws is uneven or the valve body is deformed by excessive tightening, which may cause the radial clamping of the spool and the adjustment failure. . Loose locking device, blocked orifice and reverse connection of oil inlet and outlet may cause unstable production flow. The spool valve sealed by the gap wears too much, which increases the internal leakage and also causes the flow to be unstable. Repair of flow control valve According to the failure phenomenon of the flow control valve, after identifying the cause of the failure, repair it. Check the geometric accuracy of the spool and sleeve. If the gap is too small, grinding and trimming should be carried out to avoid jamming. If the gap is too large, brush plating technology can be used to repair the valve core. If the valve core and seat are not well sealed, they should be ground. The spring is deformed or broken and should be corrected or replaced.

What are the advantages and disadvantages of oxygen shut-off valves? The types of oxygen shut-off valves are divided into external thread type and internal thread type according to the position of the valve stem thread. According to the flow direction of the medium, there are straight-through type, direct-current type and angle type. The globe valve is divided into sealing form, including packing seal globe valve and bellows seal globe valve. The structure of the oxygen globe valve body includes straight-through, straight-through and right-angle types. The straight-through type is the most common structure, but its fluid resistance is the largest. The direct-flow fluid resistance is small, and it is mostly used for fluids containing solid particles or high viscosity. The right-angle valve body is mostly forged, which is suitable for the globe valve with smaller passage and higher pressure. The oxygen shut-off valve is a forced-sealing valve, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters valve six from below the valve disc, the resistance that the operating force needs to overcome is the friction force between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the valve The diameter of the stem should be large, otherwise the failure of the top of the valve stem will occur. After the appearance of the self-sealing valve, the medium flow direction of the oxygen shut-off valve is changed from the top of the valve disc into the valve cavity. At this time, under the action of the medium pressure, the force to close the valve is small, but the force to open the valve is large, and the diameter of the valve stem can be reduce accordingly. At the same time, under the action of the medium, this form of valve is also tighter. my country's valve "Three Chemicals" once stipulated that the flow direction of the globe valve should be from top to bottom. When the oxygen shut-off valve is opened, when the opening height of the valve disc is 25% to 30% of the nominal diameter, the flow rate has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the globe valve should be determined by the stroke of the valve disc. First, the advantages of oxygen shut-off valve: (1) Good sealing performance, small friction between sealing surfaces, and long service life. (2) The structure is simple, and the manufacture and maintenance are more convenient. (3) The working stroke is small and the opening and closing time is short. 2. Disadvantages of oxygen shut-off valve: (1) The adjustment performance is poor. (2) The fluid resistance is large, and the force required for opening and closing is large. (3) It is not suitable for media with particles, high viscosity and easy coking.

What are the core accessories of chemical corrosion-resistant pumps? Chemical anti-corrosion pumps are generally used in pumps that transport corrosive liquids. Due to the particularity of the medium, the requirements for the selection of materials for anti-corrosion pumps are also very strict. Function, then what are the overcurrent components of the pump, and what components are they referring to? 1. What are the overcurrent components of the pump? Many people who are ignorant of chemical anti-corrosion pump products want to know what are the primary flow components of the water pump. In fact, we take the commonly used centrifugal pumps as an example. Centrifugal pumps are classified as vane pumps. The flow components of vane pumps are mainly impellers. , pump cavity, suction chamber, pump cover, seal, pressurized water chamber, pump shaft and other major components. Second, the structure method of water pump impeller and blade The number of semi-open and open impeller blades is less, generally 2~5 pieces, and most of them are used for pumping slurry granular liquid or sewage, such as the impeller of sewage pump. In the field of sewage discharge, in order to ensure that the medium containing solid particles, fibers and other surrounding objects is blocked when conveying, channel-type impellers are often used. The material of the impeller of the water pump must have sufficient mechanical strength, and must have certain wear resistance and corrosion resistance. According to the requirements of the transport medium, cast iron, cast steel, stainless steel or, for example, oil pump products are generally used to transport flammable and explosive oil impellers made of bronze materials. 4. Water pump suction chamber, pump chamber, water pump pressure chamber 1. The pump cavity and the water suction chamber of the pump are located in front of the impeller, and their function is to guide the liquid to the impeller. The pump cavity is also an important position for the liquid to circulate and output in the pump. 2. The pressurized water chamber is located on the periphery of the impeller, sometimes called the pump body. Its function is to collect the liquid flowing out of the impeller, convert most of the kinetic energy into pressure energy, and then send it into the discharge pipe, 3. The materials of the water absorption chamber and the pressurized water chamber should have sufficient mechanical strength, wear resistance and corrosion resistance, and cast iron, cast steel and stainless steel are generally used. The anti-corrosion pump has outer cast steel lined with fluorine plastic and so on. 5. Pump cover. seal The pump cover is the primary component for fixing the impeller and the seal. The impeller rotates to prevent liquid leakage through the seal. When the liquid overflows, the pump cover is the part that directly touches the liquid. 3. The role of water pump impeller and the type of impeller The pump impeller is an important working part of the pump, and its shape, size, and processing technology have a decisive impact on the pump performance. The function of the pump impeller is to transfer the energy input by the prime mover to the liquid. The shape and size of the pump impeller are closely related to the performance of the pump. Pump impellers can generally be divided into single-suction and double-suction. Single-suction impellers absorb water on one side, and small-flow pump impellers mostly use this method. The double-suction impeller absorbs water at both ends, and the impeller of the large-flow water pump adopts the double-suction impeller. There are mainly three structural methods for the impeller of the water pump: the one with front and rear cover plates is called a closed impeller. Only the rear cover is called a semi-open impeller. An impeller without front and rear covers is called an open impeller. Other blade structure methods can also be divided into two types: cylindrical blades and twisted blades. The blades of the centrifugal pump impeller are generally backward curved blades. There are two types of blades: cylindrical and twisted. The use of twisted blades can reduce the load of the blades, improve the suction performance of the centrifugal pump, and improve the anti-cavitation ability, but the manufacturing is difficult and the cost is high. Pump impeller The centrifugal pump for oil refining and chemical industry requires the impeller to be the whole pump impeller that is cast or fully welded. Welded pump impellers are developed in recent years, and are mostly used for casting metal materials with poor performance, such as iron and its alloys, to manufacture special centrifugal pumps for chemical industry. The geometric accuracy and surface finish of the welded pump impeller are better than the cast impeller, which is beneficial to the power of the forward centrifugal pump. Generally, the closed-type water pump impeller has 2-12 backward curved blades, which has high operating power. For example, the aforementioned single-suction and double-suction centrifugal pumps use this impeller. In the meantime, the impeller of the single-stage single-suction centrifugal pump has an axial force, so some impellers have a balance hole at the root of the blade.

How to make the anti-corrosion centrifugal pump last longer? Anti-corrosion centrifugal pump is a pump used in corrosive liquids to transport corrosive liquids such as acid, alkali and salt. The price is slightly higher than ordinary ones according to different raw materials. When users choose anti-corrosion centrifugal pumps, how can they make the centrifugal pumps more efficient? Long-lasting, the first is to choose a pump factory with reliable quality, and the second is to use and maintain the pump during operation. Huaqiang anti-corrosion pump has reliable quality, mature technology, and lifetime warranty replacement of components, which completely solves the user's worries. The following introduces the anti-corrosion centrifugal pump How to operate and maintain the pump correctly? Operation and maintenance of centrifugal pumps 1. Preparation before launching In order to ensure the safe operation of the pump, the unit should be fully and carefully inspected before the pump is started, especially for the pump of the new installation and the pump after the overhaul, and more attention should be paid to the inspection work, so as to find out the problem and deal with it in time. The first checks are as follows: 1. Check whether the anchor bolts and other connecting bolts of the pump motor are loose or fall, and if so, they should be tightened or replaced. 2. Check whether the rotor of the unit is flexible and simple, whether there is metal friction in the pump, and if so, check the reason. This inspection is often carried out by cranking, that is, rolling the coupling of the unit by hand. 3. Check whether the lubricating oil in the bearing is normal and whether the oil is clean. 4. Check whether the gate valve on the outlet pipe is active. 5. Check whether the steering of the motor and the water pump is consistent, and whether the power supply and distribution equipment is fixed; for the water pump of the new installation or the water pump after the overhaul, it is an essential job to check the steering of the motor. 6. Remove the sundries on the water inlet of the pump to prevent damage to the impeller after the sundries are sucked in after starting the machine. 7. Check whether the control system is normal, whether the appearance of each surface is accurate, and if there is remote control, check whether the remote monitoring is accurate and useful. 2. Diversion and initiation 1. Water diversion From the operating principle of the centrifugal pump mentioned above, it is necessary to divert water before the centrifugal pump is started. Generally, small centrifugal pumps mostly use the method of irrigation and exhaust. At this moment, the lower end of the suction pipe should be equipped with a bottom valve. The methods of water diversion include tap water irrigation, overhead box irrigation, and exhalation pump irrigation. Most of the large and medium-sized centrifugal pumps use the method of water-ring vacuum pump to pump air and water. When pumping, when there is water in the exhaust pipe, it means that the suction pipe and the pump are filled with water, and the pump can be started to work. For the self-priming water pump with the water pump device lower than the level of the suction pool, open the water inlet valve, and the water will automatically fill the suction pipe and the pump. 2. Initiate Centrifugal pumps are generally started by closing the gate. When starting, the operator and the crew should not get too close. After the speed of the pump is stable, the valves on the vacuum gauge and pressure gauge should be opened immediately, and the reading on the pressure gauge should rise to the pump. The idling head at zero flow indicates that the pump is now pressurized. Then gradually open the gate valve on the pressure water pipe. At this moment, the reading of the vacuum gauge gradually increases, the reading of the pressure gauge gradually decreases, and the reading of the ammeter on the switchboard should gradually increase. The initiation operation is completed when the gate valve is fully opened. When the pump is closed, the working time should generally not exceed 2~3min; if the time is too long, the water flow in the pump will heat up due to the continuous circulation in the pump, resulting in damage to some parts of the pump. a. Assuming that after the motor is closed, there is only a "hum" sound without rolling, the power should be cut off immediately to check the cause. b. Assuming that the pump rolls without water, the pump should be stopped immediately to check the cause. 3. Working of centrifugal pump 1. After each pump unit is put into work, the relevant record items on the working day report should be filled in in time. For computer management, the daily working data of each pump should be input into the computer's storage system. 2. The new unit uses greased ball bearings. The initial oil change time is after the unit works for 80h~100h, and the oil is changed every 2400h in the future (using molybdenum disulfide lubricant, the time can be doubled). For bearings lubricated by mechanical oil, change the oil every 240h, and always pay attention that the oil level should be between the two scales of the oil scale. 3. Pay attention to the abnormal noise and vibration of the unit. When the pump is working normally, the unit should be calm, and the sound should be uninterrupted in response to the normal connection. Abnormal noises and oscillations are often the harbingers of pump defects. In this case, stop the machine immediately for inspection. 4. Pay attention to the inspection of the bearing temperature and oil quantity of the unit. When the bearing heats up, generally it should not exceed the ambient temperature by 30°C to 40°C, and the height should not exceed 75°C. If there is no thermometer, it can also be touched by hand. Judging by experience, if you feel very hot, you should stop the inspection. 5. The normal dripping level of the stuffing box is generally only controlled to be able to drip down, not connected into a line, that is, 20 to 150 drops per minute. The amount of water dripping can be controlled by loosening and tightening the packing gland. Be careful not to press on one side to prevent wear of the shaft sleeve and gland. 6. If a large pump set adopts a water-cooled bearing or a circulating oil-cooled motor, the water circuit and oil circuit should be dredged. If there is a defect in the circulating cooling system, the pump should be stopped immediately for maintenance. 7. For water pump units without heat preservation methods, when the water pump does not work in winter, the water should be drained from the threaded pipe plug at the bottom of the water pump to prevent the water pump from freezing and cracking. The pump should also be placed to store water for a long time without the need for a pump. 8. When the water level of the injection and suction well is changed, if the water level of the suction well is lower than the planned water level, one or two units should be shut down appropriately to avoid cavitation and damage to the impeller. 9. Regularly check the coupling and the anchor bolts on the unit. If any deviation or looseness is found, it should be corrected and tightened in time. 10. Watch out for changes in surface pointers. Under normal working conditions, the position of the surface pointer should be basically stable at a certain position. If the surface pointer changes and jumps violently, the cause should be identified immediately. For example, if the vacuum gauge is reading up, it may be that the suction pipe is blocked or the water level of the water source is falling; the pressure gauge reading is rising, maybe the pressure water pipe is blocked; Should the speed drop, the impeller is blocked, etc. For the motor, pay attention to whether the reading on the ammeter exceeds the rated current of the motor. If the current is too large or too small, the vehicle should be parked and checked in time. Four, centrifugal pump parking attention Before the centrifugal pump is parked, the vacuum gauge and pressure gauge valve should be closed for the centrifugal pump, and then slowly close the gate valve on the pressure pipe to implement closed-gate parking. After parking, care should be taken to wipe off the water and sludge on the surface of the pump and motor. If the pump is not necessary for a long time or after parking in winter, the water in the pump housing should be drained immediately. For some problems that cannot be dealt with at work, they should be dealt with in time after parking. For pumps with higher head, pay attention to the possible damage caused by water hammer when the pump is stopped. Generally speaking, the pump system has already taken into account the impact of water hammer when the pump is stopped. For operators, it is necessary to pay attention to ensure that the water hammer elimination system is complete and useful at all times. Useful to minimize the impact of water hammer when the pump is suddenly stopped.

What are the commonly used non-metallic materials for valves? Nitrile rubber Buna-N The rated temperature range of the nitrile rubber seat is -18 ℃ ~ 100 ℃. Also commonly called NBR, NITRILE, or HYCAR. It is an excellent general purpose rubber material for water, gas, oil and grease, gasoline (except gasoline with additives), alcohol and glycol, liquefied petroleum gas, propane and butane, fuel oil and many other media . It also has good wear resistance and deformation resistance. Food grade (FG) nitrile rubber valve seat rated temperature range is -18 ℃ ~ 82 ℃. Its composition complies with CFR Part 21 Section 177.2600. Its use range is the same as that of conventional nitrile rubber but requires FDA (US Food and Drug Administration) certification. Ethylene propylene rubber EPDM The rated temperature range of the ethylene-propylene rubber valve seat is -28 ℃ ~ 120 ℃. EPDM is the abbreviation of its composition, that is, a terpolymer of ethylene, propylene and diene, usually also called EPT, Nordell, EPR. Excellent ozone resistance and weather resistance, good electrical insulation performance, good resistance to polar capacitors and inorganic media. Therefore, it can be widely used in HVAC industry, water, phosphate, alcohol, ethylene glycol, etc. Ethylene-propylene rubber seats are not recommended for use with hydrocarbon organic solvents and oils, chlorinated hydrocarbons, turpentine, or other petroleum-based greases. The rated temperature range of food grade ethylene propylene rubber valve seat is -28 ℃ ~ 120 ℃. Its composition complies with CFR Part 21 Section 177.2600. Its use range is the same as that of conventional nitrile rubber but requires FDA (US Food and Drug Administration) certification. PTFE The rated temperature range of the PTFE valve seat is -32℃~200℃. Excellent high temperature resistance and chemical resistance. Because PTFE has high density and excellent permeability, it can also prevent the corrosion of most chemical media. Conductive PTFE is an improved PTFE product that allows electrical current to pass through the lining and thereby cancels the insulating properties of PTFE. Because of its conductive properties, conductive PTFE cannot be tested for quality by electric sparks. Reinforced PTFE RTFE RTFE is a modification of PTFE material. Although pure PTFE has a very low friction coefficient (0.02~0.04), it has a large amount of wear. Moreover, due to its easy creep, poor mechanical properties, low bearing capacity, and poor dimensional stability, it has great limitations as a friction material. Only modification can meet the special requirements of wear-resistant sealing materials from all walks of life through the method of material compounding. In improving the wear resistance of PTFE, some wear-resistant substances such as glass fiber, carbon fiber, graphite, molybdenum disulfide, Bronze powder and some organic compounds make them form network nodes in the PTFE layered structure to improve stiffness, thermal conductivity, creep resistance, and greatly improve wear resistance. Viton The rated temperature of the fluororubber valve seat is -18℃~150℃. Viton is a registered trademark of DuPont, and Fluorel is a registered trademark of 3M Company that is equivalent to fluororubber. This material has high temperature resistance and excellent chemical resistance. Suitable for hydrocarbon products, low and high concentrations of mineral acids, but not for steam media and water (poor water resistance). Ultra High Molecular Weight Polyethylene UHMWPE The rated temperature range of UHMWPE valve seat is -32℃~88℃. This material has better low temperature resistance than PTFE, but still has excellent chemical resistance. UHMWPE also has good wear resistance and corrosion resistance, and can be used in high-abrasion occasions. Silicone copper rubber Silicon copper rubber is a polymer with organic groups composed of silicon and oxygen atoms in the main chain. The rated temperature range is -100℃~300℃. It has good heat resistance and temperature resistance, excellent electrical insulation performance and high chemical inertness. It is suitable for organic acids and low-concentration inorganic acids, dilute alkalis and concentrated alkalis. Disadvantages: low mechanical strength. Post curing is required. Graphite Graphite is a crystal of carbon, a non-metallic material with silver-gray color, soft texture and metallic luster. Mohs hardness is 1~2, specific gravity is 2.2~2.3, and its bulk density is generally 1.5~1.8. It has unique physical and chemical properties such as high temperature resistance, oxidation resistance, corrosion resistance, thermal shock resistance, high strength, good toughness, high self-lubricating strength, thermal conductivity and electrical conductivity. It has special oxidation resistance, self-lubrication and plasticity at high temperature, and also has good electrical conductivity, thermal conductivity and adhesion. It can be used as a filler or performance improver for rubber, plastics and various composite materials to improve the wear resistance, compression resistance or conductivity of materials. Graphite is usually used to make valve gaskets, packings and valve seats. The melting point of graphite is extremely high. It begins to soften and tend to melt when it reaches 3000 °C under vacuum. At 3600 °C, graphite begins to evaporate and sublime. The strength of general materials gradually decreases at high temperature, while graphite is heated to 2000 °C. On the contrary, the strength is doubled compared with that at room temperature, but the oxidation resistance of graphite is poor, and the oxidation speed gradually increases with the increase of temperature.

A chemical pump is necessary when the liquid you are moving cannot be used with a regular style pump. They are often used when a chemical that needs to be transferred is either corrosive or abrasive. Some of the industrial liquids commonly used with chemical pumps include: sulphuric acids, acetic acid and sodium hypochlorite They are far more durable than conventional pumps. Offering you the option of moving fluids in a variety of ways. You will find that a pump usually comes in two different types; a centrifugal pump or positive displacement pump, which one you use will depend on your specific application. When purchasing one of these devices, it is important to make sure you get the right pump that it suited to the type of chemical you plan to transfer. Many centrifugal pumps come in the form of an ANSI process pump, depending on your specific application. Whereas positive displacement pumps are commonly known as screw pumps, diaphragm pumps or plunger pumps. Chemical pumps are powered by a number of different sources. Depending on the device you are looking to get, it could be powered by one of these many sources: AC or DC voltage, hydraulic or pneumatic systems, gasoline or diesel engines, steam, water, and natural gas. Types of Chemical Pumps Magnetic Drive Pumps This style of pump is great for transferring or moving corrosive and aggressive chemicals. It operates by using centrifugal forces to generate velocity. Allowing you to move an hazardous chemicals without the fear of leaks or spills. Drum Pumps A drum pump allows you to transfer chemicals from a 200 litre (44 gallon) drum. Making it easy move chemicals and acids from an extremely awarded barrel drum. Air Operated Diaphragms Pumps These chemical pumps come in a range of sizes and specifications, therefore it is important to pick one that is suited to your needs. A diaphragm pump also includes a discharge check valve to help prevent backflow. Centrifugal Pumps The velocity generated by the centrifugal forces make this pump highly effective at transfers extremely corrosive and hazardous chemicals. By utilising rotating impellers, they can increase velocity, and help to push fluids through an outlet valve. Lobe Pumps This positive displacement style pump is prefect for moving thicker products such as creams and oils.

Analysis of the performance and common shortcomings of high temperature magnetic pump The high-temperature magnetic pump is a kind of non-contact torque transmission through a magnetic drive (magnetic coupling) to replace the dynamic seal with a static seal, so that the pump can be completely leak-free. The permanent magnets made of materials have a wide operating temperature range (-45-400 °C), high coercivity, good anisotropy in the direction of the magnetic field, and no demagnetization when the same poles are close to each other. A good source of magnetic fields. When the high temperature magnetic pump is working, a small amount of liquid must be used to flush and cool the annular gap area between the inner magnetic rotor and the insulating sleeve and the friction pair of the sliding bearing. The flow rate of the coolant is generally 2%-3% of the planned flow rate of the pump, and the annular gap area between the inner magnetic rotor and the insulating sleeve generates high heat due to eddy currents. When the cooling lubricating fluid is not available or the flushing hole is not smooth or blocked, the temperature of the medium will be higher than the working temperature of the permanent magnet, the inner magnetic rotor will gradually lose its magnetism, and the magnetic drive will fail. When the medium is water or water-based liquid, the temperature rise in the annulus region can be maintained at 3-5°C; when the medium is hydrocarbon or oil, the temperature rise in the annulus region can be maintained at 5-8°C. According to the use of the application, the high-temperature magnetic pump is selected for hot water, and the suction pump is selected for low-level water absorption. In addition, the flow rate and head of the pump should also meet the application requirements. Common disadvantages of high temperature magnetic pumps are: 1. The lift is missing. The reasons for this shortcoming are: there is air in the transport medium, the impeller is damaged, the rotation speed is not allowed, the specific gravity of the transported liquid is too large, and the flow rate is too large. 2. The shaft of the high temperature magnetic pump is broken. The material selected for the pump shaft of the CQB type high temperature magnetic pump is 99% alumina porcelain. The primary reason for the breakage of the pump shaft is that the shaft is twisted and broken due to the dry grinding of the bearing due to the empty operation of the pump. When the pump is disassembled for inspection, it can be seen that the bearing has been seriously worn and the first way to prevent the pump from breaking is to avoid the empty work of the pump. 3. Lack of traffic. The main reasons for the lack of flow are: the impeller is damaged, the rotation speed is not enough, the head is too high, and there is debris in the pipe blocked. 4. The high temperature magnetic pump cannot pump liquid. The fact that the high temperature magnetic pump cannot pump liquid is a disadvantage of the pump, and there are many reasons for it. First of all, check whether there is air leakage in the suction pipe of the pump, check whether the air in the suction pipe is discharged, whether the amount of liquid perfused in the high-temperature magnetic pump is sufficient, whether there is debris in the suction pipe, and also check whether the pump rotates (Especially after replacing the motor or after the power supply line is overhauled), you should also pay attention to whether the suction height of the pump is too high. If the above inspection still cannot be solved, the pump can be disassembled and checked to see if the pump shaft is broken. It should also be checked whether the dynamic and static rings of the pump are intact, and whether the entire rotor can move axially. If the axial movement is difficult, check whether the carbon bearing is too tightly combined with the pump shaft

Basic principle and applicable occasions of screw pump The screw pump plays an important role in the industry. Its principle is to use the rotation of the screw to suck and discharge the liquid. It mainly relies on the volume change and movement of the meshing space formed between the pump body and the screw to transport the liquid. The role of the screw pump in various fields of life is also different. It exerts its own characteristics in suitable occasions. It transports the medium containing particles or fibers, and when the inherent structure of the medium is not damaged, it is more ambitious to use a single screw pump for transportation. , we will introduce the relevant content in detail below. First, the basic principle of screw pump 1. The basic principle of the screw pump: the screw pump is a positive displacement rotor pump, which mainly relies on the volume change and movement of the meshing space formed between the pump body and the screw to transport liquid or pressurize the liquid. Divided into single-screw pump, twin-screw pump and triple-screw pump. When the automatic screw rolls, it drives the driven screw that meshes with it to roll together, the volume of the screw meshing space at one end of the suction cavity gradually increases, and the pressure drops. The liquid enters the meshing space volume under the action of the pressure difference. When the volume increases to a larger size to form a sealed cavity, the liquid moves axially one after another in the sealed cavity until one end of the cavity is discharged. At this time, the volume of the screw meshing space at one end of the discharge cavity is gradually reduced, and the liquid is discharged. 2. The working principle of the screw pump is similar to that of the gear pump, except that the screw replaces the gear in the structure. The pump has two structures of single-suction and double-suction, but the single-screw pump has only single-suction. The pump must be equipped with a safety valve (single screw pump does not have to be equipped) to prevent damage to the pump or the prime mover due to some reasons such as blockage of the discharge pipe that causes the pump outlet pressure to exceed the allowable value. 2. Application occasions of screw pump 1. Transport lubricating oil, transport fuel oil, transport various oils and polymers, suitable for transporting viscous liquids. 2. Transporting high-viscosity medium: According to the size of the pump, it can transport the medium with viscosity from 37000-200000 centipoise. 3. Transporting media containing particles or fibers: the particle diameter can be 30mm (not exceeding the rotor eccentric distance). Fiber length can be 350mm (proper pitch of 0.4 rotor). 4. When the conveying pressure is required to be stable and the inherent structure of the medium is not damaged, it is more ideal to use a single screw pump for conveying.

1. Overview of chemical process pumps There are many types of chemical process pumps, which can be divided into vane pumps according to their working principles, such as centrifugal pumps, axial flow pumps, mixed flow pumps, partial flow pumps, vortex pumps, etc.; positive displacement pumps, such as reciprocating pumps (including plunger pumps, piston pumps, etc.) pumps, diaphragm pumps, etc.); rotary pumps (including screw pumps, liquid ring pumps, gear pumps, sliding vane pumps, Roots pumps, radial piston pumps, etc.); other types of pumps, such as production process or product characteristics, can be divided into It is high pressure methylamine pump, cryogenic pump, phosphoric acid slurry pump, etc. In chemical or petrochemical production, pumps operate under high temperature, low temperature (or ultra-low temperature), high pressure, flammable, explosive, toxic and strong corrosive media, and some still have high inlet pressure, high lift, high viscosity, small flow, Working under high cavitation conditions puts forward very strict requirements for the performance of chemical pumps, especially for corrosion resistance, no leakage (for toxic media) and wear resistance. In order to meet the special requirements of chemical production, chemical special pumps are also produced in the chemical machine work, such as plastic pumps, glass pumps, ceramic pumps, graphite pumps, shielded pumps, magnetic pumps, impurity pumps, etc. The media that need to be transported in the process of phosphate fertilizer production mainly include phosphate slurry, phosphoric acid slurry, various filtrates, concentrated phosphoric acid, dilute phosphoric acid, concentrated sulfuric acid, dilute sulfuric acid and fluorosilicic acid, etc. The pump is easily corroded by the medium or corroded and washed away. Second, chemical process pump operation requirements In chemical or petrochemical production, pumps operate under high temperature, low temperature or ultra-low temperature, high pressure, flammable, explosive, toxic and strong corrosive media. Working under the conditions of small flow and high cavitation, the performance of the chemical pump has very strict requirements, especially for corrosion resistance, leakage and wear resistance. In the work, we also specialize in the production of special chemical pumps, such as plastic pumps, glass pumps, ceramic pumps, graphite pumps, shielded pumps, magnetic pumps, impurity pumps, etc. 3. Working conditions of chemical process pump It is suitable for conveying neutral or corrosive, clean or liquid medium containing solid particles, low temperature or high temperature. Working pressure: higher 2.5Mpa; Working medium temperature: -70℃-180℃; Maximum flow: 2000m3/h; higher lift: 160m; Speed: 1450r/min and 2900r/min; Matching motor maximum power: 315Kw. Fourth, the benefits of chemical process pumps 1. The impeller can be closed, semi-open and open. It can transport clean, particle-containing, and a small amount of gaseous media. It can also transport high temperature, low temperature and strong corrosive media. The impeller is equipped with a balance hole and an anti-corrosion ring to balance the axial force. 2. The pump body and the bearing frame are connected by the central connecting section. According to different working conditions, different materials can be used for the central connecting section to avoid serious corrosion of the bearing frame and bearing when transporting strong corrosive media. A water-cooling cavity is arranged in the central connecting section, and the circulating water is cooled to block the high-temperature medium and transmit the high temperature to the bearing. 3. The sealing method can choose packing seal, single or double-end mechanical seal, and cartridge type single-end mechanical seal. According to different conditions and the user's requirements for cooling and flushing, the seal can be selected from the case according to the API682 design specification. 4. There are three methods for bearing erection: air-cooled heat sink, air-cooled fan, and water-cooled cavity. Users can choose according to the operating conditions. The bearings are lubricated by the oil ring splashing thin oil from the oil tank. The oil in the oil tank is cooled by the water in the water cooling chamber, and the heat in the bearing is taken away by the cold water to ensure that the bearing is in normal working condition at any time. 5. According to the temperature and pressure of the medium, the support method is to use the center support and the tripod support.

Precautions for the use of single screw pump in the food industry Anyone who knows the single screw pump should know that the single screw pump is very suitable for some jobs with a relatively high level of hygiene, such as medical work, food and beverage work, etc. So what are the precautions when the single screw pump is used in food work? ? 1. The most important point of using a single screw pump in food work is hygiene and cleanliness, so it must be cleaned and disinfected when the single screw pump is put into use. 2. If the single-screw pump is placed in a humid environment for a long time or used in a humid environment, it will easily corrode, so we must pay attention to anti-corrosion, and if it produces corrosion and rust, it must be dealt with in time, and the parts should be replaced. To be replaced in time. 3. After the single-screw pump has been placed for a long time in use, it may cause deposition or dryness when transporting the medium, which also needs to be cleaned. For details, please refer to the manual provided by the manufacturer. 4. Because the stator of the single-screw pump will experience thermal and chemical effects when cleaning the single-screw pump, it must be started 2~3 times a minute when starting to use the single-screw pump. The purpose of this is to ensure the single-screw pump. The cavity between the pump stator and the rotor can be thoroughly cleaned. 5. The lower part of the motor is equipped with an upper-thrust bearing. There is a groove on the thrust bearing for dry cooling, and it is a stainless steel thrust plate for grinding, which is responsible for the axial force of the pump.

What should be paid attention to in the installation of the suction pipeline of the self-priming pump The self-priming pump adopts the self-priming pump body structure with radial liquid return. The self-priming pump body is composed of a suction chamber, a liquid storage chamber, a scroll chamber, a liquid return hole, a vapor-liquid separation chamber, etc. After the self-priming pump starts normally, the impeller will suck the liquid stored in the chamber and the gas in the suction pipeline. Inhaled at the same time, and fully mixed in the impeller, under the effect of centripetal force, the liquid is brought into the vapor to the outer edge of the scroll, and a certain thickness of milky white foam belt and high-speed running liquid ring are produced on the edge of the impeller. The vapor-liquid combination enters the vapor-liquid separation chamber according to the outer diffusion pipe, and then the whole process is cyclically opened, and the gas in the suction pipeline continues to decrease until the gas is exhausted, and the whole process of self-priming is carried out. The suction pump is invested in all normal operations, and there is a refrigeration chamber at the bottom of the rolling bearing body of some self-priming pumps. Self-priming pump motor heating causes and solutions Summary Self-priming pump motor heating is not always a problem of motor product quality, talk about what causes motor heating and how to deal with it: 1. The mechanical seal of the self-priming pump is too tight during installation and removal. Solution: Re-scheduling the amount of bullet yellow reduction. 2. The quality of the assembly line of the self-priming pump is poor, and the balance between the motor and the pump shaft of the self-priming pump is not uniform. Solution: Check the quality of the assembly line of the self-priming pump, and the reassembly is effective. 4. The transported material share is very large. Solution: Add the motor output power to deal with the heating of the self-priming pump motor. 3. The working voltage on the spot is not stable or the applicable cable of the self-priming pump motor does not exceed the standard. Solution: To deal with the problem of working voltage, replace the standard cable. The installation of the suction line of the self-priming pump should pay attention to: A. The installation height-width ratio of the suction inlet should not exceed 5 meters. When the standard is approved, the installation height-width ratio of the suction inlet should be as small as possible smaller than the water storage plan of the storage tank, and the length of the suction pipe should be reduced as much as possible. Install the elbow, which is beneficial to reduce the self-priming time and improve the self-priming effect. B. The gate valve, flange plate, etc. in the suction pipeline should be resolutely prevented from leaking steam or water leakage, that is, no steam leakage is allowed in the suction pipeline. C. The self-priming pump body should be prevented from inhaling solid and other dirt, so the suction pipeline should be set with filtering equipment. The reasonable total blanching area of the filter equipment should be 2-3 times the cross section of the suction pipe, and the filter equipment should be protected regularly. D. The suction pipeline and the discharge pipeline need to have their own support frame, and the self-priming pump body itself cannot bear the load of the pipeline.

What is the reason for the severe vibration of the pump body of the screw pump The screw pump is a very high-quality pump, which relies on the volume change of the sealed cavity formed by the screw and the bushing to inhale and discharge the liquid. It has the advantages of stable flow, self-priming ability, low noise, long life and reliable operation. It can transport high-viscosity media, and it does not form eddy currents and is insensitive to the viscosity of the media. So it is widely used today. There are always some common problems when people use the screw pump. Of course, this does not explain the quality of the screw pump. Any equipment will encounter various problems during the use process, and these problems are generally caused by human beings or some other factors. . We must first check carefully to see if the parts of the screw pump are defective, find out where the problem comes from, and prescribe the right medicine. For example, when using a screw pump, the pump body often vibrates violently or generates noise. What is the reason? Generally speaking, it is because the water pump equipment is not strong or the water pump equipment is too high; the ball bearing of the motor is damaged; the main shaft of the water pump is bent or is not concentric or parallel to the main shaft of the motor. We don't need to be serious when encountering such problems, and this situation can also be dealt with. The first method is to stabilize the equipment height of the screw pump or the descending pump; correct the bent main shaft of the pump or adjust the relative orientation of the pump and the motor. Introduction to the precautions recommended by the screw pump The screw pump is a screw pump that needs to be primed before the first recommendation, and does not need to be primed when it is recommended again. It can automatically extract the gas in the suction pipe and transport the liquid normally. A suction chamber is added at the inlet of the screw pump, and the suction pipe is above the center line of the impeller. After the pump is stopped, a part of the liquid remains in the suction chamber. When the pump is again recommended, it is recommended to enter the gas-liquid separation chamber added at the outlet to separate the gas and liquid, and the liquid returns. Go to the suction chamber until the suction tube is filled with liquid, and the liquid is transported normally. Stainless steel screw pump is an energy-saving pump product developed by absorbing, digesting and improving relevant technical data at home and abroad. It has the advantages of compact structure, simple protection, high efficiency, and strong self-priming capacity adjustment. The screw pump pipeline does not need to be equipped with a bottom valve, and it is only necessary to ensure that the pump body has a quantitative liquid infusion before operation.