www.saVRee.com Diaphragm Pump Explained| 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!
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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.