Pumps

Diaphragm pumps or Membrane Pumps are positive displacement pumps that are found throughout many industries with many applications. They use flexible materials for the reciprocation properties such as Teflon, Rubber, Silicon, and others molded into a diaphragm. Including in the pump or system are backflow prevention devices such as ball, and check valves.

There are different type of technologies to drive the diaphragm such as piston-shaft connections, hydraulic oil, or air. In all cases, the differential pressure exerted into the diaphragm is what makes it fill the "wet side" with the fluid to be pump and empty it.

Reliability of these pumps is pretty remarkable. Some are put through very though applications since there are not rubbing parts inside the pumps. The failures of diaphragm pumps are typically of corrosion created on the material of the diaphragm by the liquid being pumped, or rupture of the flap by too much pressure.

Diaphragm Pumps can be driven by many different source of power such as Pneumatic (Air), Electric Motors (AC and DC), Hydraulic Motors, and even gas, air, water with pressure relief valves.

Construction of a Diaphragm Pump

The following lists will provide you with an idea of the most common materials used in the development and construction of Diaphragm Pumps.

 

Most common materials used for the Diaphragm:

 

• Buna N
• EPDM
• Viton
• Silicon
• Telfon (PTFE)
• Other plastic and rubber compunds

 

Most Common materials used for the Housings, and other metallic parts:

 

• Aluminum
• Iron
• Teflon
• Bronze
• Stainless Steel

Advantage of Diaphragm Pumps

• Solid Handling capacity
• Suction Lift
• Self Primers
• Dry running capacity
• high viscous liquid
• Low Shear

Applications of Diaphragm Pumps

• Industrial
• Chemical
• Hygienic