Material selection requirements for pneumatic diaphragm pumps

‌ 　　 When selecting the model of the pneumatic diaphragm pump, you will definitely encounter the problem of choosing the material of the pneumatic diaphragm pump; in general, the raw material of the pneumatic diaphragm pump refers to the material that flows through, that is, the part through which the liquid passes. What kind of material pneumatic diaphragm pump to choose depends on what kind of medium you pump.
Introduction and characteristics of raw materials:
1. Cast steel and aluminum alloy raw materials
cast steel A2 material, cast steel is American high toughness and wear-resistant tool steel, which belongs to air-hardened section steel, and its maximum working temperature is 120℃. The mass fraction of carbon of the steel is about 1%, the hardness can reach 57~62HRC after heat treatment, and the mass fraction of chromium is about 5%. After polishing, the surface of the steel is darker, has excellent corrosion resistance, strong ductility, and mold blade The mouth has better damage resistance. The steel has excellent hardenability, uniform carbide distribution, certain impact and good wear resistance. It has outstanding air-quenching function, with small deformation after air-quenching, uniform and fine carbides, and good wear resistance.
2, stainless steel raw materials
Stainless steel (Stainless Steel) is the abbreviation of stainless and acid-resistant steel. It is called stainless steel that is resistant to weak corrosive media such as air, steam, and water, or is stainless steel; there are two commonly used pump body stainless steels: stainless steel 304, stainless steel 316L, The main difference between the two is that 316L contains NI higher than 304, and has better rust resistance. 316L contains MO but 304L does not. Therefore, stainless steel 316L has better acid and alkali corrosion resistance than stainless steel 304.
3, aluminum alloy raw materials
Aluminum alloy has low density but relatively high strength, which is close to or exceeds that of high-quality steel. It has good plasticity and can be processed into various profiles. It has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry and is second only to steel. . Some aluminum alloys can be heat treated to obtain outstanding mechanical, physical and corrosion resistance. Hard aluminum alloys belong to the AI-Cu-Mg series and generally contain a small amount of Mn, which can be strengthened by heat treatment. It is characterized by high hardness but poor plasticity. Super-hard aluminum belongs to the Al-Cu-Mg-Zn series, which can be strengthened by heat treatment and is the highest strength aluminum alloy at room temperature. However, it has poor corrosion resistance and fast softening at high temperature. Wrought aluminum alloys are mainly Al-Zn-Mg-Si series alloys. Although there are many types of participating elements, but the content is small, it has excellent thermoplasticity and is suitable for casting, so it is also called cast aluminum alloy.
4. Polypropylene raw materials
Polypropylene is a product obtained by the polymerization of propylene under the action of a catalyst. The molecule is: -[-CH2–CH(CH3)-]-n. It is a mixture. Polymers are all mixtures.
Polypropylene is a thermoplastic resin made by polymerizing propylene. According to the orientation of the methyl group, there are three types: isotactic polyprolene, atactic polypropylene and syndiotatic polypropylene. It is non-toxic, tasteless, low density, strength, rigidity, hardness and heat resistance are better than low-pressure polyethylene, and can be used at around 100°C. It has outstanding electrical functions and high-frequency insulation and is not affected by humidity, but it becomes brittle at low temperatures, not wear-resistant, and easy to age. Suitable for making general mechanical parts, corrosion-resistant parts and insulating parts. Common organic solvents such as acids and alkalis have little effect on it and can be used for food utensils.
5, PVDF fluoroplastic raw materials
Poly(vinylidene fluoride), the English abbreviation PVDF, is a homopolymer of ethylene or a copolymer of vinylidene fluoride and a few other fluorine-containing vinyl monomers. It combines the characteristics of fluorine resin and general resin, in addition to outstanding In addition to chemical resistance, high temperature resistance, oxidation resistance, weather resistance, and radiation resistance, it also has special functions such as piezoelectricity, dielectric properties, and thermoelectric properties. It ranks second in the production value of fluoroplastics Large product, the global annual production capacity exceeds 53,000 tons.
In the chemical structure, the fluorine-carbon bond is combined. This structure with short bond properties and hydrogen ion form the most stable and strong bond. Therefore, fluorocarbon coatings have specific physical and chemical functions, not only have strong wear resistance and impact resistance, but also have high fade resistance and UV resistance in extremely harsh and harsh environments.

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Precautions for installation of pneumatic diaphragm pump

Precautions for installation of pneumatic diaphragm pump

Pneumatic diaphragm pumps are more and more widely used in various fields. Let’s now talk about the equipment problems of pneumatic diaphragm pumps. Pneumatic diaphragm pumps are placed as close to the product as possible, so that the suction pipe line is shortest, the number of equipment parts is reduced, and the diaphragm is increased. Pump flow, extending diaphragm life.
1. The diameter of the suction pipe of the pneumatic diaphragm pump is the same as the diameter of the inlet port of the pump. The suction pipe at the inlet must be durable and free of wrinkles to be able to produce a high vacuum state. The diameter of the outlet piping should be the same as the outlet diameter, or maybe a little larger to reduce friction loss. All piping and joints must be airtight, otherwise it will reduce the pump’s self-priming ability
2. Pneumatic diaphragm pump location: Noise, safety and other factors usually have requirements for the location of the equipment. Parallel equipment with conflicting requirements may cause blockage of the application area and affect other pump equipment
3. Application of pneumatic diaphragm pump: First of all, the position of the pneumatic diaphragm pump must be easy to check, so that it will be convenient for maintenance personnel to carry out daily inspection and debugging.
4. Air supply pressure of pneumatic diaphragm pump: Each pneumatic diaphragm pump should have a vent pipe, and the vent pipe should be able to supply enough air to achieve the ideal pumping flow. The air pressure depends on different pumping requirements, but do not exceed the maximum allowable pressure. Compressed air higher than the rated pressure may cause personal injury and property loss and damage the performance of the pump.
5. Equipment height of pneumatic diaphragm pump: Please fully consider the self-priming ability of pneumatic diaphragm pump to prevent self-priming ability.
6. The best equipment should be selected at the junction of the shortest and most direct inlet and outlet pipelines. Should try to prevent rated bends and pipe fittings. The pump body can independently support all pipelines. In addition, the pipelines should be placed in an orderly manner to prevent stress on the pump body pipeline equipment; the equipment can move the hose to eliminate the stress caused by the natural reciprocating action of the pump. Connect the pump body to a fixed base, and place a cushion between the pump body and the base will help reduce the pump body sensation.
7, to ensure that the largest particle contained in the fluid does not exceed the maximum safety of the pump through the particle diameter standard. Excessive particles can cause pipeline blockage, overpressure in the pump, and damage to the pump body. When transporting flammable and toxic fluids, please connect the outlet to a safe place away from the work area.
8. Ensure the cleanliness and normal operating conditions of the driving air system. Such as transporting hazardous and toxic fluid pumps, please do not send the pump directly to the manufacturer for repair, properly handle it in accordance with local laws and regulations, and use the manufacturer’s pure accessories to ensure service life.
9. Static sparks may cause blasting and cause personal injury and death accidents and property losses. According to the needs, use a wire with a large cross-sectional area to properly and reliably ground the ground screw on the pump.
10. The pneumatic diaphragm pump and diaphragm should be checked periodically, and the wearing parts should be replaced regularly to extend the service life of the diaphragm pump.
11. The exhaust of the pneumatic diaphragm pump may contain solids. Do not point the exhaust to the work area or people, so as to avoid personal injury. Please use at least 3/8″ inner diameter pipe with smooth inner wall to connect the air inlet.
12. When the diaphragm of the diaphragm pump is damaged, the transported materials will be ejected from the exhaust muffler. The high pressure of the fluid may cause severe personal injury and property damage. Please do not perform any maintenance on the pump body and piping system when the pump is pressurized. For maintenance, block the pump air intake first and turn it aside. The general pressure relief organization relieves the pressure of the pipeline system and gradually loosens the joints of the pipeline.

AODD PUMP FROM CHINA — Air Diaphragm Pump Application area:Chemical Industry; Coating Industry; Painting Industry; Dye Industry; Pigment and Textile Chemical Industry; Food Industry; Water treatment Industry; Petroleum Industry; Environmental protection Industry; Pharmaceutical Industry

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Analysis of applicable occasions for pneumatic diaphragm pumps

Analysis of applicable occasions for pneumatic diaphragm pumps:

Because the pneumatic diaphragm pump has the above characteristics, the pneumatic diaphragm pump has gradually invaded the market of other pumps since its birth, and occupied a part of the pneumatic diaphragm pump. For example: Pneumatic diaphragm pumps in the painting and ceramic industries have taken an absolute leading position, while in other occupations, such as environmental protection, wastewater treatment, construction, sewage, and fine chemicals, it is expanding its market share, and other pumps are not enough. Alternative position.
Pneumatic diaphragm pump is a new type of transportation machinery, and it is currently the most novel type of pump in China. Using compressed gas as the power source, all kinds of corrosive liquids, liquids with particles, high-viscosity, volatile, flammable, and highly toxic liquids can all be exhausted. The pneumatic diaphragm pump has four materials: plastic, aluminum alloy, cast iron, and stainless steel. Pneumatic diaphragm pumps select nitrile rubber, chloroprene rubber, fluorine rubber, polytetrafluoroethylene, polyhexaethylene according to different liquid media. To meet the needs of different users. Settled in various special occasions, it is used to pump various media that cannot be pumped by conventional pumps, and has achieved satisfactory effects.
1. Because it uses gas as power, the flow rate is automatically adjusted with the change of back pressure (outlet resistance), which is suitable for medium and high viscosity fluids. The operating point of the centrifugal pump is set based on water. If it is used for a fluid with a slightly higher viscosity, it must be equipped with a reducer or a frequency converter, which greatly increases the cost. The same is true for gear pumps.
2. In flammable and explosive environments, pneumatic pumps are reliable and low-cost, such as the transportation of fuel, gunpowder, and explosives, because: first, no sparks can occur after grounding; second, no heat is generated during work, and the machine is not It will overheat; Third, the fluid will not overheat, because the pneumatic diaphragm pump will stir the fluid the least.
3. In the poor center of the construction site, such as construction site, industrial and mining wastewater discharge, because the sewage contains many impurities and complex composition, the pipeline is easy to be blocked, which creates an environment with excessive load on the electric pump, and the motor is easily damaged by heat. The pneumatic diaphragm pump can pass particles and has an adjustable flow rate, and automatically stops when the pipeline is blocked.
4. Other pneumatic diaphragm pumps are small in size and easy to move, do not require a foundation, have a small footprint, and are easy and economical to settle. Can be used as a mobile material transport pump.
5. In the treatment of hazardous and corrosive materials, the diaphragm pump can completely isolate the materials from the outside world.
6, or some tests to ensure that no impurities contaminate the material.
7. It can be used to transport fluids with relatively unstable chemical properties, such as photosensitive materials, flocculation fluids, etc. This is because the shear force of the diaphragm pump is low and the physical impact on the data is small.

Diaphragm Pump from china — Double Diaphragm Pump AODD Pump Rubber Diaphragm for Pump for Food& Chemical, Chemical Resistant Diaphragm Pump is the new kind of transportation machine, adopting compress air, smoke and industry exhaust gas as power source.

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Material selection of AODD PUMP

Material selection of AODD PUMP:

AODD PUMP is a multifunctional product, which is widely used. There are five kinds of materials for the pump body of the pneumatic diaphragm pump: cast iron, aluminum alloy, engineering plastics, stainless steel and fluorine-lined plastic. How to choose the material of the pneumatic diaphragm pump? According to many years of experience, how to recommend diaphragm pump products for you:

Generally select according to the purpose of pneumatic diaphragm pump:
一, food pump
1, peanut butter, kimchi, mashed potatoes, red sausage, chocolate, syrup, etc. Recommend the use of stainless steel pneumatic diaphragm pump (Reason for recommendation: stable operation, low vibration, safety and health)
2. Beer and beverages recommend the use of engineering plastic pneumatic diaphragm pumps. (Reason for recommendation: safe and hygienic, strong transportation ability, durable in use)
Second, engineering plastic diaphragm pumps are recommended for special places such as tankers, oil plants, oil wells, tank wells, mines, and tunnels. (Reason for recommendation: safe explosion-proof, corrosion-resistant and wear-resistant)
Three, strong acid, strong alkali, strong corrosive, highly toxic, flammable, volatile liquid, engineering plastic diaphragm pump is recommended for special places. (Reason for recommendation: strong corrosion resistance, safe and reliable)
Note: It is advisable to choose cast iron diaphragm pump for concentrated sulfuric acid transportation.
Fourth, organic solvents, such as alcohol, benzene, phenol, etc., advocate the use of stainless steel pneumatic diaphragm pumps. (Reason for recommendation: safe and reliable)
Five, stainless steel pneumatic diaphragm pump is recommended for paint, gum, pigment and adhesive. (Reason for recommendation: high efficiency and corrosion resistance)
Six, it is recommended to use cast iron pneumatic diaphragm pumps for glue, clean water and cement slurry. (Reason for recommendation: stable operation, economical and practical)
Seven, all kinds of tiles, porcelain, bricks and pottery glaze, etc. Recommend the use of cast iron pneumatic diaphragm pump (Reason for recommendation: stable operation, economical and practical)
Eight, it is recommended to use aluminum alloy diaphragm pumps for sewage and lime water. (Reason for recommendation: easy to use and economical.)
Nine, sewage, high temperature chemical solvents, etc., advocate the use of fluorine plastic diaphragm pumps.

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Instructions for Air Operated Double Diaphragm Pump, a must-read for novices

What should I pay attention to when purchasing a Air Operated Double Diaphragm Pump? First of all, you need to understand whether the diaphragm pump is suitable for your material medium under the working conditions. Diaphragm pumps have high requirements for the viscosity of the material medium. The dynamic viscosity of general materials cannot exceed 10,000 centipoise (CP); confirm whether the flow rate of the diaphragm pump meets the flow rate requirements of the equipment; confirm the suction of the AODD PUMP Whether the process meets the requirements; confirm whether the installation size of the diaphragm pump can be installed on the equipment site;

Different types of media require diaphragm pumps with different pump body materials; in the case of choosing a good pump body material, it is necessary to confirm whether the diaphragm material can be applied and the use of the medium;

There are four major types of diaphragm pumps on the market:

1. For non-corrosive cast steel diaphragm pumps;

2. Aluminum alloy diaphragm pump for partial acid medium;

3. For weak acid and austenitic (304, 304L, 316, 316L) stainless steel diaphragm pumps with high pH;

4. For engineering plastic diaphragm pumps with strong acids and alkalis, under extreme conditions such as pumping aqua regia, the most corrosion-resistant polyvinylidene fluoride (PVDF) material among plastic materials should be used.

In addition to the above four points, it is also necessary to consider the supporting facilities of the on-site power source facilities, such as whether the air supply pressure in the on-site air source pipeline meets the air source requirements of the diaphragm pump; if there is no air source supporting facilities on site, whether the electric diaphragm pump can be used structure.
Air Operated Double Diaphragm Pump manufacturer and supplier from China

This AODD PUMPS is the one of the most innovative pump. For all kinds of corrosive liquid, with particles, high viscosity, volatile, flammable, explosive, poisonous liquid, ceramic glaze thick liquid, fruit purees, glue, oil tankers under-bin liquids such as oil recovery, temporary inverted cans can be smoked light. Pump body flow components material adopt stainless steel, aluminum alloy, cast iron, the diaphragm according to different liquid eyes using butyl rubber, fluorine rubber, neoprene, and four kinds of ptfe

Matters needing attention when conveying dust with AODD PUMP

Pay attention to the following matters when conveying dust with AODD PUMP:

1. Maintain good exhaust and ventilation, away from flammable, explosive and heat sources. Grounding requirements comply with local laws and regulations and some special requirements on site.

2. Ensure that all operators are familiar with the operation and use and master the safety precautions of the pneumatic diaphragm pump. If necessary, provide necessary protective equipment.

3. Ensure that the largest particle contained in the fluid does not exceed the maximum safe passing particle diameter standard of the pump.

4. The intake pressure should not exceed the maximum allowable operating pressure of the pump. Compressed air higher than the rated pressure may cause personal injury and property loss and damage the performance of the pump.

5. Ensure that the piping system of the pneumatic diaphragm pump can withstand the highest output pressure reached, and ensure the cleanliness and normal working conditions of the driving air system.

6. Electrostatic sparks may cause explosions, resulting in personal injury, death, and property loss. Use a wire with a large enough cross-sectional area as needed to properly and reliably ground the ground screw on the pump.

7. Tighten the pump and all connecting pipe joints to prevent electrostatic sparks from being generated by vibration and impact. Use antistatic hose.

8. To periodically check and test the reliability of the grounding system, the grounding resistance is required to be less than 100 ohms.

9. The exhaust of the pneumatic diaphragm pump may contain solids. Do not point the exhaust to the working area or people to avoid personal injury.

10. When the diaphragm fails, the conveyed materials will be ejected from the exhaust muffler.

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Features of Air Operated Double Diaphragm Pump

Features of Air Operated Double Diaphragm Pump:

1. Since air is used as power, the flow is automatically adjusted with the change of back pressure (outlet resistance), which is suitable for medium and high viscosity fluids. The working point of the centrifugal pump is set based on water. If it is used for a fluid with a slightly higher viscosity, it needs to be equipped with a reducer or a frequency converter, which greatly increases the cost. The same is true for gear pumps.

2. It is reliable and low-cost to use pneumatic pumps in flammable and explosive environments, such as fuel delivery, because it is impossible to generate sparks after grounding; second, there is no heat generation during work, and the machine will not overheat; third, fluid There is no overheating because the agitation of the fluid by the diaphragm pump is minimal.

3. In places with harsh construction sites, such as wastewater discharge from construction sites and industrial mines, due to the large amount of impurities and complex components in the sewage, the pipeline is easy to be blocked, which will cause excessive load on the electric pump, and the motor will be easily damaged due to heat. The diaphragm pump can pass particles and has an adjustable flow rate. When the pipeline is blocked, it will automatically stop to unobstructed. Features of pneumatic diaphragm pump

4. In addition, the Air Operated Double Diaphragm Pump is small in size and easy to move, does not require a foundation, occupies a very small area, and is easy and economical to install. Can be used as a mobile material transfer pump.

5. In the treatment of hazardous and corrosive materials, the AODD pump can completely isolate the materials from the outside world.

6. Or ensure that no impurities contaminate raw materials in some tests.

7. It can be used to transport fluids with relatively unstable chemical properties, such as photosensitive materials, flocculants, etc. This is because the shear force of the diaphragm pump is low and the physical impact on the material is small.
Air Operated Double Diaphragm Pump manufacturer and supplier from China

Air Operated Double Diaphragm Pump (AODD pump) is a new type of conveying machine in china, uses compressed air as the power source for various corrosive liquids, liquid with particles, high viscosity, volatile, flammable and highly toxic liquid.

Application of pneumatic diaphragm pump

Pneumatic diaphragm pump is a new type of pump. It has a wide range of uses. It is used in all areas of life. It has no motor itself, so it is very safe. It can be used in various flammable and explosive occasions. It can be used for pneumatic diaphragm pumps. Conveying of materials.
Diaphragm pumps are made of different materials for different purposes, such as cast iron, aluminum alloy, engineering plastics, stainless steel, and better design lining with fluoroplastics…etc, to meet different requirements According to the process requirements of the manufacturers, we will explain the application of different materials for you to explain how pneumatic diaphragm pumps are like choosing materials in different situations!
Cast iron material, not acid and alkali resistant, suitable for sewage, filter press, etc., as long as it is not corrosive, it can be used. Aluminum alloy material is characterized by light weight, easy operation, and convenient mobility. The aluminum alloy diaphragm pump with PTFE diaphragm can be used in rubber factories, resin factories, glue coating factories, paint factories, and printing factories. Pumped! The stainless steel pneumatic diaphragm pump can be used in food factories. It can transport jam, chocolate sauce, peanut butter, anything that can flow and has a certain viscosity, but as long as the viscosity is within a certain range, it can be transported by a pneumatic diaphragm pump. The material can be 304 stainless steel and 316 stainless steel! Pneumatic diaphragm pump, because the engineering plastic material itself can be used to treat acid and alkali media, it can be used to transport some corrosive media, such as chemical treatment plants, industrial wastewater, etc., as well as some cosmetic factories, transportation, emulsion Toiletries, perfumes, shampoos, hair dyes, etc. are all delivered by diaphragm pumps. There is also a diaphragm pump lined with fluoroplastics. This material is well-made and covered with a cast iron shell on the outside of PTFE. , It can reinforce the soft tetrafluoroethylene shape so that it can transport super corrosive liquids like aqua regia. There are many types of diaphragm pumps. If you don’t understand how to choose the material, if you don’t understand how to If you choose the material, we will be patient to help you choose the material that suits you!

Diaphragm pump manufacturers and suppliers from China

AODD PUMP removal and installation steps before and after inspection failure

Air operated double diaphragm pump removal and installation steps before and after inspection failure:

1. Before disassembling the AODD PUMP, mark the left and right air chambers and liquid chambers to facilitate subsequent reassembly.

2. Use a wrench to loosen the small clamp connecting the outlet pipe and the liquid chamber, remove the outlet pipe to see the valve ball and valve seat, take out the ball and seat and check other spare parts of the pump for wear, chemical corrosion, cracks, etc. phenomenon.

3. Use a wrench to loosen the small clamp connecting the inlet pipe and the liquid chamber, remove the outlet pipe to see the valve ball and valve seat, take out the ball and seat and check other spare parts of the pump for wear, chemical corrosion, cracks, etc. phenomenon.

4. Use a wrench to separate the liquid chamber and the pump’s intermediate body, and the diaphragm and diaphragm splint can be seen when the liquid chamber is removed.

5. Use tools or wrenches to fix the left and right edges of the diaphragm outer splint to separate the diaphragm device from the intermediate body. Then turn clockwise to loosen the diaphragm assembly. After removing the outer splint of the diaphragm, take the shaft out of the intermediate body.

6. Separate the shaft from the diaphragm device with clamps (padded wooden boards), and check whether the shaft, splint, and diaphragm are damaged and corroded.

7. Install from step 6 to step 1.

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Performance of AODD PUMP

The AODD PUMP is a double-suction diaphragm pump chamber. Of course, there are also single-chamber pneumatic diaphragm pumps, but the flow and head are definitely not as large as the double-suction diaphragm pump. The Air Operated Double Diaphragm Pump has a long service life. If the internal membrane is used If the quality of the film is good, the service life of the pneumatic diaphragm pump can reach more than 10 years. The advantage of this pump will not stop and never jam. It can transport not only flowing liquid media, but also difficult-to-flow media, and even dust , It has the comprehensive advantages of self-priming pump, submersible pump, mud pump, canned motor pump, etc. It can be described as a powerful diaphragm pump. It is mainly driven by compressed air and driven by general air compressors. Both liquids and liquids with particles can be pumped clean. Because it does not have a motor, it can be used safely in flammable and explosive situations. It can also be used to immerse the pump in a liquid medium. It will not damage the pump when idling. Since there are no rotating parts and shaft seals, it is a leak-proof pump.

1. No need to irrigate and divert water, suction lift up to 7m, head up to 70m, outlet pressure ≤ 0.8Mpa

2. The flow is spacious and the passing performance is good, allowing large particles up to 9.4mm in diameter. When pumping mud and impurities, there is little wear on the pump:

3. The head and flow can be adjusted by the air source pressure (the air source pressure is between 0.1-0.8Mpa);

4. Working environment range: 5-65℃; conveying medium range (-20℃-150℃);

5. The pump has no rotating parts and no shaft seal. The diaphragm completely separates the pumped medium from the moving parts and working medium of the pump, and the conveyed medium will not leak outward. Therefore, when pumping toxic, volatile and corrosive media, it will not cause environmental pollution and endanger personal safety;

6. No need for electricity, safe and reliable to use in flammable and explosive places;

7. Can be submerged in the medium to work;

8. It is convenient to use, reliable in operation, and only needs to open and close the gas valve for starting and stopping. Even if there is no medium for a long time due to unexpected conditions or sudden shutdown, the pump will not be damaged. Once overloaded, the pump will automatically stop, with self-protection performance, when the load returns to normal, it can automatically start operation.

9. Simple structure with few wearing parts. The pump structure is simple, easy to install and maintain. The medium delivered by the pump will not come into contact with moving parts such as the pump air valve, connecting rod, etc., and the performance of other types of pumps will not gradually decrease due to the wear of rotors, pistons, gears, blades and other parts;

10. It can transport more viscous liquids (viscosity below 10,000 centipoise);

11. The pump does not need lubricating oil, even if it is idling, it has no effect on the pump. This is a major feature of the pump.