Pneumatic diaphragm pump features, uses and working principle

Pneumatic diaphragm pump features, uses and working principle:

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

Medium that can be transported: pneumatic diaphragm pump is suitable for transporting a variety of corrosive, with particles of liquid, as well as high permeability, volatile, flammable, highly toxic liquid.

Material selection:

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 symmetrical working chambers of the pump, each is equipped with a flexible diaphragm, the connecting rod will connect the two diaphragmes into one, compressed air from the pump inlet joint into the air distribution valve, to promote the diaphragm action in the two working chambers, and drive the two diaphragm connected by the connecting rod synchronous movement. At the same time, the gas in the other working chamber is discharged from the back of the diaphragm, and once it reaches the end of the stroke, the valve mechanism automatically draws the compressed air to the other working chamber, pushing the diaphragm to move in the opposite direction, so that the synchronous reciprocating movement of the two diaphragmes is formed. Each working chamber is provided with two one-way ball valves, and the reciprocating movement of the diaphragm causes the change of the content of the working chamber, forcing the two one-way ball valves to open and close alternately, so that the liquid is continuously sucked and discharged.


1, can be pumped all kinds of sewage.

2, can be pumped a variety of chemical etchant, oil, mud, cleaning oil scale.

3, can be pumped a variety of highly toxic, flammable, volatile liquids.

4, can suction a variety of strong acid, strong alkali, strong corrosion liquid.

5, can be pumped a variety 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, head up to 50m, outlet pressure)6kgf/CmZ.

2, good flow performance, allowing the maximum particle diameter of 10mm. Little wear to the pump when pumping mud and impurities.

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

4, the pump has no rotating parts, no shaft seal. By the reciprocating movement of a pair of diaphragm, pumping a variety of media, because the moving parts of the pump and the working medium are completely separated, so that the conveying medium will not leak outwards, avoiding 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 to operate. Even if there is no medium pumping for a long time or sudden shutdown due to unexpected circumstances, the pump will not be damaged as a result. Once overloaded, the pump will automatically shut down, with self-protection ability. When the load is restored to normal, it can automatically start running.

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

9, can transport more clear liquid.

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

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