Air Operated Diaphragm Pumps manufacturer and supplier from China

Material: Stainless steel , Cast Iron，polypropylene, Aluminium alloy，Fluoroplastic， PTFE , PFA
Size: 1/2″~4” , DN10mm~DN100mm
Flow Rate (Q) 0 – 60 (m3/h)
Lift Head (H) 0 – 70 (m)

A diaphragm pump or AODD PUMP is really a positive displacement pump that utilizes a mix of the reciprocating action of the rubber, thermoplastic or teflon diaphragm and appropriate valves on each side from the diaphragm (check valve, butterfly valves, flap valves, or other type of shut-off valves) to function a fluid.
According to the material can be polypropylene AODD Pump, stainless steel AODD Pump, aluminum alloy AODD Pump!

When the level of a chamber of either kind of pump is elevated (the diaphragm upgrading), pressure decreases, and fluid is attracted in to the chamber. Once the chamber pressure later increases from decreased volume (the diaphragm moving lower), the fluid formerly attracted was forced out. Finally, the diaphragm upgrading once more draws fluid in to the chamber, finishing the cycle. This course of action is comparable to those of the cylinder within an car engine. Diaphragm Pumps generate a hermetic seal between your drive mechanism and also the compression chamber, allowing the pump to transfer, compress, and evacuate the medium with no lubricant.

For more information, please contact us：https://www.saikenpumps.com/Air-Operated-Double-Diaphragm-Pump/

How to solve the problems of Air Operated Double Diaphragm Pump and increase the service life

What are the problems that need our attention when using Air Operated Double Diaphragm Pump? What is the cause of the problem? How can the service life of the pump be increased?

The pump is running, but the flow rate is too low.
(1) Check the pump body for cavitation, and adjust the inlet pressure of compressed air. Reduce the running speed of the pump to adjust the viscosity and concentration of the liquid.
(2) Check whether the valve ball is stuck. If the conveyed liquid does not match the material of the valve ball. The valve ball will expand. Please replace the ball and seat with suitable materials.
(3) Please check whether the inlet pipe is blocked.
How can the AODD PUMP fail to start or move slowly?
(1) Check whether the filtering, pressure regulating and lubricating device and the air inlet filter are blocked.
(2) Check whether the air valve is stuck by impurities, please remove and clean the air valve, and check whether the piston in the air valve has scratches. If the surface of the piston is shiny and not black, it means that the piston and the “O” ring need to be replaced. Traces of injury. Please replace with a new product
(3) Check the spindle and “O” ring for scratches, abrasions and flattening marks, and replace them if they are damaged.
How to deal with liquid leakage from the gas chamber outlet?
(1) Please check whether the diaphragm is broken.
(2) Check whether the diaphragm is correctly installed and locked.
Where is there a lot of bubbles in the outlet liquid?
(1) Please check whether the diaphragm is broken.
(2) Check whether the pump body and pipeline leak.

Five, the role, significance and status of the Air Operated Double Diaphragm Pump seal
　(1) Function: Improve machine efficiency and reduce energy consumption. Reduce friction loss, change the sealing method, change the paving system, safety and environmental protection.
　(2) Significance: Although the sealing technology is not a leading technology, it is a decisive technology. Although the seal is not large, it is just a component, but it determines the safety and reliability of the machine. Pneumatic diaphragm pump seals account for 60% of the workload in daily equipment maintenance.
　(3) Status: More than 86% of petrochemical process equipment uses pneumatic diaphragm pumps for sealing. With the development of sealing technology, the pneumatic diaphragm pump seal of mechanical pump occupies a more important position.

Flushing of pneumatic diaphragm pump seal
　　 Flushing is the most effective measure to control the temperature and extend the seal life of the pneumatic diaphragm pump. The purpose of flushing is to take away heat, reduce the temperature of the sealed chamber, prevent the vaporization of the liquid film, improve the lubrication conditions, prevent dry running, prevent the accumulation of impurities and the formation of airbags. Flushing is actually a direct cooling method, which includes forward flushing, back flushing, full flushing and comprehensive flushing. The sources of flushing fluid are internal flushing and external flushing. According to the flushing population, there are single-point flushing and multi-point flushing. 　(1) Forward flushing When the temperature of the medium is 0~80°C, forward flushing is the usual flushing cooling method. It is the most commonly used method, and it is divided into two types: self flushing and external flushing.
2) Backwash the sealing medium drawn from the sealing cavity back to the lower pressure in the pump (usually at the entrance of the pump), and use the sealing medium to circulate and flush the sealing cavity. This method is often used in occasions where the difference between the sealing pressure and the discharge pressure is extremely small.
　(3). Full flushing introduces the sealing medium from the high pressure side of the pump (pump outlet), and then draws the medium from the sealing cavity back to the low pressure side of the pump for cyclic flushing. This flushing is also called through flushing.
(4) Two-way flushing For dual-support pumps, two-way flushing can be used. The pressure in the seal cavity at the outlet end is higher than the pressure of the inlet seal to connect the seal chambers at both ends. The outlet end of the pump is reverse flushed, and the inlet end of the pump is forward. Flushing is called two-way flushing.

How to calculate the flow rate of the gear pump

How to calculate the flow rate of the gear pump:

The displacement V of a gear pump is equivalent to the sum of all tooth valley volumes of a pair of gears. If the tooth valley volume is roughly equal to the volume of the gear teeth, then the displacement of the gear oil pump is equal to the sum of the tooth valley volume and the tooth volume volume of a gear. It is equivalent to the annular volume swept by the plane formed by the effective tooth height (h=2m) and tooth width, namely:

V =πDhB = 27πzm²B

In the formula: D is the gear index circle diameter, D=mz (cm); h is the effective tooth height, h=2m (cm); B is the gear width (cm); m is the gear module (cm); z is Number of teeth.

In fact, the volume of the tooth valley is slightly larger than the volume of the tooth, so π in the above formula is often replaced by 3.33, then the formula (3-10) can be written as:

V=6.66zm²B

The flow rate q(1/min) of the gear oil pump is:

q=6.66zm²Bηv-3 X10

In the formula: n is the gear oil pump speed (rpm); ηv is the volumetric efficiency of the gear oil pump.

In fact, the oil delivery volume of the gear oil pump is pulsating, which means the average oil delivery volume of the pump.

It can be seen from the above formula that the relationship between flow and several main parameters is:

(1) The oil delivery volume is proportional to the square of the gear modulus m.

(2) When the volume of the pump is constant, the number of teeth is small, the modulus is large, so the oil delivery volume increases, but the flow pulsation is large; when the number of teeth increases, the modulus is small, the oil delivery volume decreases, and the flow pulsation is also small. For low-pressure gear oil pumps on machine tools, take z=13～19, and for medium-high pressure gear oil pumps, take z=6～14, and when the number of teeth z<14, make corrections.

(3) The oil delivery volume is proportional to the tooth width B and the speed n. Generally the tooth width B=(6～10)m; the speed n is 750r/min: 1000r/min, 1500r/min. If the speed is too high, it will cause insufficient oil absorption, and the pump will not work normally if the speed is too low. Generally, the larger circumferential speed of the gear should not be greater than 5-6m/s.

https://www.saikenpumps.com/Plastic-Magnetic-Drive-Pump/

Gear pump manufacturers and suppliers from China

Precautions for magnetic pump

Precautions for magnetic pump:
　
　　1. To prevent the particles into

　　 (1) does not allow any ferromagnetic impurities, particles into the magnetic actuator and the bearing friction pair. (2) The transmission medium easy to crystallize or precipitate after going to the timely processing (after the pump stopped pumping cavity infusion of water, running clean emissions after 1min) in order to protect the life of sliding bearings. (3) transport medium containing solid particles should be filtered at the entrance to the pump flow tube.

　
　　2. To prevent the demagnetization

　　
　　(1) magnetic moment can not be designed too small. (2) should be run under the specified temperature conditions, the temperature exceeded medium is strictly prohibited. Magnetic pumps can be installed in the outer surface of isolated sets of platinum resistance temperature sensor detecting temperature annulus region in order to overrun when the temperature alarm or shut down.

　
　　3. Prevention of dry friction

　　
　　(1) idling is strictly prohibited. (2) The medium is strictly prohibited for taking the time. (3) In the case of export of valve closure, pump continuous operation time of no more than 2min, to prevent overheating and loss of magnetic actuators.

Magnetic pump manufacturers and suppliers from China

The correct selection method of magnetic pump

Based on the current status of domestic magnetic pump production and the development of magnetic materials and sliding bearings, in order to ensure the quality of the project, the following steps can be used when selecting magnetic pumps.

1. For pumps whose power is less than 10KW, the use of magnetic pumps can ensure the use effect.
2. When the shaft power of the pump is greater than 10KW or the temperature of the medium is higher than 100°C, the domestic magnetic pump should be handled carefully. The material of the magnetic steel and the structure of the bearing material should be restricted, and the canned pump should be selected if necessary.
3. At present, domestic magnetic drive pump manufacturers are generally medium and small factories, and the development and research methods are relatively weak. For pumps that exceed the range of product parameters, it is generally not appropriate to entrust the manufacturer to research or develop them to ensure the quality and progress of the project.
4. The quality of the magnetic steel material is related to the life, reliability and price of the pump. When ordering, the magnetic steel material, the supplier and its performance indicators should be clarified. The material and life of the sliding bearing should also be clarified.

Magnetic drive pump manufacturers and suppliers from China

Gear pump working principle application industry

Performance characteristics

The gear pump adopts involute gears or arc gears. Generally have a safety valve. Gear oil pump is suitable for conveying lubricating and non-corrosive oils and other liquid media, and suitable for conveying high-lift media. The gear oil pump is lubricated by the conveyed medium. The advantage is that the medium is not demanding. The general pressure does not exceed 6MPa. It has the characteristics of self-priming, uniform flow and reliable operation.

Working principle

The gear oil pump is a positive displacement rotary pump. The work is accomplished by installing two gears of the same size in the casing to mesh and rotate. One driving wheel and one driven wheel. The two ends of the gear are sealed by the front and rear covers. The gear divides the inside of the pump casing into two. There are two independent working chambers, namely the suction chamber and the discharge chamber. The driving gear of the gear oil pump drives the driven gear to rotate during delivery. When the gear is disengaged, the volume of the chamber gradually increases. A partial vacuum is formed in the suction chamber, and the liquid is sucked in. The liquid fills the teeth of the gear and is brought to the discharge cavity. When the gear enters the mesh, the volume gradually decreases to form a high-pressure liquid and discharge it out of the pump through the pump discharge port. According to the continuous rotation and meshing of the gears, the liquid is continuously discharged to complete the conveying work.

The scope of use

Gear oil pumps are widely used in petroleum, chemical, shipbuilding, electric power, grain and oil, food, medical, building materials, metallurgy and other industries. Gear oil pumps are not suitable for conveying solid particles, fibers, and corrosive media. They are suitable for conveying lubricating oil with a temperature below 180°C and a viscosity between 5 and 1500 cst or other liquids with similar properties. It is suitable for all kinds of occasions where heat preservation is required in the process of outdoor installation in alpine areas with solidification at room temperature. Gear oil pumps are relatively cost-effective.

Gear pump manufacturers and suppliers from China

Applicable occasions of AIR OPERATED DOUBLE DIAPHRAGM PUMP

Because the AIR OPERATED DOUBLE 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 AODD PUMP. For example, pneumatic diaphragm pumps in the painting and ceramic industries have an absolute dominant position, while in some other industries, such as environmental protection, wastewater treatment, construction, sewage, and fine chemical industries, it is expanding its market share and has other pumps. Alternative status.

Pneumatic diaphragm pump is a new type of conveying 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 be exhausted by light extraction. The pneumatic diaphragm pump has six materials: plastic, aluminum alloy, cast iron, stainless steel, perfluorinated, and steel lined with PTFE. The pneumatic diaphragm pump adopts nitrile rubber, neoprene rubber, fluorine rubber, polytetrafluoroethylene, polyhexaethylene according to different liquid media. To meet the needs of different users. It is installed in various special occasions and used to pump various media that cannot be pumped by conventional pumps, and has achieved satisfactory results.
1. Due to the use of gas as power, the flow rate is actively 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, and 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 the transportation of fuel, gunpowder and explosives, because:
First, it is impossible to produce sparks after grounding;
Second, there is no heat generation during work, and the machine will not overheat;
Third, the fluid will not overheat, because the pneumatic diaphragm pump has the least agitation to the fluid.
3. In the harsh center of the construction site, such as construction site, industrial and mining wastewater discharge, due to the large amount of impurities in the sewage and the 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 will automatically stop when the pipeline is blocked.
4. In addition, the pneumatic diaphragm pump is small in size, easy to move, does not require foundation, has a small footprint, and is easy and economical to install. Can be used as a mobile material delivery pump.
5. In the treatment of hazardous and corrosive materials, the diaphragm pump can completely isolate the materials from the outside world.
6. Or in some experiments, ensure that no impurities contaminate the raw materials.
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 material is small.

AODD PUMP manufacturers and suppliers from China

You come to know about AIR OPERATED DOUBLE DIAPHRAGM PUMP

Introduce the AIR OPERATED DOUBLE DIAPHRAGM PUMP:
Pneumatic diaphragm pump is a new type of conveying machinery, and it is currently the most novel type of pump in China. Using compressed air as the power source, it can be used for various corrosive liquids.
The AODD PUMP has four materials: engineering plastics, aluminum alloy, cast iron, stainless steel, and fluoroplastics. The pneumatic diaphragm pump adopts nitrile rubber, neoprene rubber, fluororubber, polytetrafluoroethylene, polyhexaethylene, etc. according to different liquid media to meet the needs of different users. It is installed in various special occasions and used to pump various media that cannot be pumped by conventional pumps, and has achieved satisfactory results.

Diaphragm pump manufacturers and suppliers from China

Analysis of the types of AIR OPERATED DOUBLE DIAPHRAGM PUMP

Analysis of the types of AODD PUMP

AIR OPERATED DOUBLE DIAPHRAGM PUMP, also known as control pump, is the primary type of actuator. After receiving the control signal from the modulation unit, the flow of the fluid can be changed through power operation. Diaphragm pumps are generally composed of actuators and valves. With compressed air as the power source, it can pump all kinds of corrosive liquids, granular liquids, high viscosity, volatile, flammable, and highly toxic liquids.
Pneumatic diaphragm pump has four kinds of materials: plastic, aluminum alloy, cast iron and stainless steel. There are four kinds of materials for electric diaphragm pumps: plastic, aluminum alloy, cast iron, and stainless steel. Diaphragm pumps use nitrile rubber, chloroprene rubber, fluorine rubber, polyvinylidene fluoride, and polytetrahydroethylene according to different liquid media. To meet demand. Placed in various special occasions, it is often used for pumping medium that cannot be pumped. Diaphragm pumps can be divided into pneumatic, electric and hydraulic power according to the power of the actuator. They are pneumatic diaphragm pumps driven by compressed air, electric diaphragm pumps driven by electricity, electro-hydraulic diaphragm pumps driven by the pressure of liquid media (such as oil), as well as solenoid valves, electronic, intelligent, and field bus barriers, depending on their function And characteristics. Membrane pump. Diaphragm pumps have many varieties and different structures, but they are constantly updated and changed. Generally speaking, valves are universal. They can not only be matched with pneumatic actuators, but also with electric actuators or other actuators.
Category: Electro-pneumatic diaphragm pump-3 inch plastic electro-pneumatic diaphragm pump-A80 Verderair Almatec series adds the largest scale pump A80. The pump is a large-capacity design and consists of three parts: two compartments and a central body, operation and Easy to maintain. The import and export standard is DN80, the maximum flow rate is 48 cubic meters per hour, and the maximum particle size is 15mm.
Diaphragm pump, pneumatic diaphragm pump, peristaltic pump, hose pump, magnetic pump, Verderair Almatec has a wide range of applications, from the chemical to the food industry. Almatec small pumps are generally used for circulation and sampling, while large pumps are primarily used in the chemical and OEM markets. Pneumatic valve is an important part of pneumatic diaphragm pump. The patented A80 valve is completely free of metal, with high reliability and low noise. This unique design provides a continuous balanced load for the barrier without pressure difference, thereby prolonging the life of the barrier.
One, diaphragm pump selection
The valve body selection of the diaphragm pump is the most important link in the selection of the diaphragm pump. There are many types of valves for diaphragm pumps. The commonly used ones are straight-through single-seat, straight-through two-seat, angle, barrier, small flow, three-way, eccentric rotation, butterfly, sleeve, spherical, etc. 10 types. Before selecting a valve, carefully analyze the medium, process conditions and parameters of the control process, collect the data that meets the requirements, understand the requirements of the diaphragm pump system, and determine the type of valve used based on the collected data. When making specific choices, the following aspects can be considered:
(1) The shape and structure of the valve core are primarily based on the selected flow characteristics and unbalanced force.
(2) Wear resistance When the fluid medium is a suspension containing a high concentration of abrasive particles, serious conflicts will occur every time the valve core and valve seat are closed. Therefore, the flow of the valve should be stable, and the internal material of the valve should be hard.
(3) Because of the corrosiveness of the medium, under the condition of satisfying the conditioning function, try to choose a valve with a simple structure.
(4) When the temperature and pressure of the medium are high and change greatly, the valve core and seat materials should be used as the valve with little temperature and pressure change.
(5) Avoid flashing and cavitation only in liquid media. In the actual production process, flashing and cavitation not only affect the calculation of the flow coefficient, but also cause vibration and noise and shorten the service life of the valve. Therefore, flashing and cavitation should be avoided when selecting valves.
2. Selection of diaphragm pump
(1) The output force of the actuator, regardless of its type, is the effective force to overcome the load (mainly refers to the unbalanced force and unbalanced torque plus conflict, sealing force, gravity and other related forces). Therefore, in order to make the diaphragm pump work normally, the supporting actuator should be able to produce a satisfactory output force, overcome various resistances, and ensure high sealing performance and valve opening. Regarding dual-effect pneumatic, hydraulic and electric actuators, there is generally no reset spring. The magnitude of the effect has nothing to do with the direction of the effect. Therefore, the key to selecting an actuator is to find the maximum output force and torque of the motor. Regarding the single-effect pneumatic actuator, the output force is related to the valve opening, and the force on the diaphragm pump will also affect its movement characteristics. Therefore, it is necessary to establish a force balance in the entire opening range of the diaphragm pump.
(2) After the output power of the actuator is determined by the type of the actuator, the corresponding actuator is selected according to the requirements of the process environment. On-site explosion-proof requirements use pneumatic actuators, junction boxes are explosion-proof, and electric actuators cannot be used. If there is no explosion-proof requirement, pneumatic and electric actuators can be selected, but considering energy saving, electric actuators should be used as much as possible. In hydraulic actuators, its use is not as widespread as pneumatic and electric actuators, but its conditioning accuracy is high.

Use common sense of stainless steel magnetic pump

Common sense and working conditions of stainless steel magnetic pump
Stainless steel magnetic pump is suitable for transporting low viscosity, non-flammable, explosive and easy to vaporize. It is widely used in high-rise building water supply and drainage plant filtration and transportation, pipeline pressurization, etc.; flushing and cleaning system, water treatment system and other equipment supporting systems; ultrafiltration system , Reverse osmosis system, distillation system, separator, swimming pool and other water treatment environments.
Device specifications and precautions for use of stainless steel magnetic pump: Magnetic drive can be divided into synchronous or asynchronous design. Most stainless steel magnetic pumps use synchronous design. The motor is connected with the outer magnet through an external coupling, and the impeller is connected with the inner magnet. There is a fully sealed barrier sleeve between the outer magnet and the inner magnet to completely separate the inner and outer magnets so that the inner magnet is in the medium. The rotor of the motor directly drives the impeller to synchronize through the attraction of the magnetic poles between the magnets. scroll.
1. Check whether the rotation direction of the motor is consistent with the steering symbol of the stainless steel magnetic drive pump.
2. Before the pump stops working, the sweep valve should be closed first, and then the suction pipe door should be closed.
3. The stainless steel magnetic pump should be installed horizontally and not erected. For occasions with special requirements for vertical installation, the motor must face upwards.
4.Stainless steel magnetic pump should be checked before use, the motor blades should be sensitive to rolling, without jamming and abnormal noise, and all fasteners should be tightened.

Inverter selection only needs to consider the load power. Many users usually only match the inverter capacity based on the power of the drive motor when purchasing inverters. If the comprehensive factors are not fully considered, the inverter may be damaged due to improper use. Equipping with necessary braking units and filters may cause safety risks.
1. Uneven load: Some loads are sometimes light and sometimes heavy. At this moment, the inverter capacity should be selected according to the heavy load conditions, such as rolling mill machinery, destruction machinery, mixers, etc.
2. Large inertia load: such as centrifuges, punches, rotary kilns in cement plants, the motor has energy feedback when decelerating, and a frequency converter with a larger capacity should be used to accelerate the start to prevent oscillation.
3 .Crane load: The characteristic of the load of the stainless steel magnetic pump is that the impact is great when starting, so a certain margin of the inverter is required. At the same time, put the elbow under the heavy object, so use the brake unit or use the shared bus method.