diaphragm pump features, uses and working principle

diaphragm pump is a new type of conveying machinery, using compressed air as the power source, using the diaphragm in the cylinder block back and forth agitation to do work, to achieve the purpose of conveying a variety of media.

Air operated double diaphragm pump is suitable for conveying all kinds of corrosive, with particles of liquid, as well as high tolerance, volatile, flammable, highly toxic liquid.

Selection of materials:

1, shell selection of materials are: aluminum alloy, cast iron, stainless steel.

2, diaphragm selection of materials are: butadiene rubber, neoprene rubber, fluorine rubber, PTFE.

Pneumatic diaphragm pump working principle:

In the two symmetric working chamber of the pump, each is equipped with a piece of elastic diaphragm, connecting rod two diaphragm connected into one, compressed air from the pump inlet joint into the valve, promote the diaphragm action in the two working chamber, driving the connecting rod connected two diaphragm synchronous movement. At the same time, the gas in another working chamber is discharged from the back of the diaphragm out of the pump. Once it reaches the end of the stroke, the valve mechanism automatically leads the compressed air to another working chamber, pushing the diaphragm to move in the opposite direction, so as to form the synchronous reciprocating motion of the two diaphragmes. Each working chamber is provided with two one-way ball valves, the reciprocating motion of the diaphragm, resulting in the change of the content of the working chamber, forcing the two one-way ball valves to open and close alternately, so as to continuously suck and discharge the liquid.


1, can be pumped all kinds of sewage.

2, can be pumped all kinds of chemical caustic agent, oil, mud, cleaning oil scale.

3, can be pumped all kinds of highly toxic, flammable, volatile liquid.

4, can be pumped all kinds of strong acid, strong alkali, strong corrosion liquid.

5, can be pumped all kinds of high temperature liquid, the highest temperature can withstand 150℃.

6, can be used as a variety of solid-liquid separation equipment before the pressure feeding equipment.

Pneumatic diaphragm pump features:

1, do not need irrigation water, suction up to 7m, up to 50m head, outlet pressure)6kgf/CmZ.

2, good flow performance, allow through the maximum particle diameter of 10mm. Pumping mud, impurities, little wear on the pump.

3, head, flow can be achieved through the valve opening stepless adjustment (air pressure adjustment between l and 7kgf/cmZ).

4, the pump has no rotating parts, no shaft seal. By a pair of diaphragm reciprocating motion, pumping a variety of media, because the moving parts of the pump and the working medium are completely separated, so that the transmission medium will not leak outwards, avoid environmental pollution and personal harm.

5, do not use power supply, can be used in flammable, explosive places, safe and reliable.

6, can be immersed in the medium instead of submersible pump pumping liquid.

7, open, stop the pump, just open and close the gas valve can be operated. Even if there is no medium pumping for a long time or sudden stop due to unexpected circumstances, the pump will not be damaged as a result. Once overload, the pump will automatically stop, with self-protection ability. When the load returned to normal, and can automatically start running.

8, simple structure, less wearing parts. Diaphragm pump has simple structure, convenient installation and maintenance. Pump conveying medium will not contact with the distribution valve, connecting rod and other moving parts, to avoid the corrosion and wear of parts.

9, can transport more clear liquid.

10, do not use oil lubrication, even idling, there is no effect on the pump.

diaphragm pump features, uses and working principle-China Saiken Pumps