www.saVRee.com Diaphragm Pumps pg. 2
Diaphragm Pump Parts
Diaphragm pumps are typically pneumatically operated, but may also be electrically or
mechanically operated. Electrically operated pumps require electric motors whilst
pneumatically operated pumps require an air distribution valve. This article focuses upon
air actuated diaphragm pumps because they are the most common.
Good to know – ‘non-return’ valves are also known as ‘check’, ‘one-way’, ‘reflux’, ‘foot’ and ‘retention
valves’, but all terms mean the same thing!
Are you enjoying this PDF so far? Then be sure to check out our online engineering video
courses. We have over 60 hours of engineering video content already online, and its all
delivered in a simple and easy to understand format. Enjoy!
How does a diaphragm pump work?
Diaphragm pumps require compressed air, electrical current, or mechanical movement
in order to work; the following example assumes compressed air is used as this is the most
common medium used to operate a diaphragm pump. It is possible to have a single or
double diaphragm pump, but the double diaphragm pump is far more common due to its
higher efficiency (a result of its double acting motion).
Good to know – double acting pumps discharge fluid whilst moving in two directions
(bidirectional). Single acting pumps discharge fluid whilst moving in only a single direction (uni-
directional). Hydraulic pistons and pneumatic rams often utilise a single or double acting
design.