Double Diaphragm Pumps are displacement pumps that compress fluid by decreasing the volume of a chamber containing the fluid. Two diaphragms are mechanically, hydraulically, or pneumatically oscillated to displace the liquid or gas. A chamber is divided with one side using hydraulic fluid, air, or a motorized drive to move the diaphragm.
The media is pulsed through the pump without contacting the actuating media. Double diaphragm pumps are often a component in a complete fluid transfer system where a switch or valve is used to control the flow of the media continuously or on demand. In applications where sludge, sewage, or other suspended solids are parts of the consistency of the media, a strainer can be used to protect the pump from debris.