Self-priming diaphragm pumps
Ideal for pumping thick, muddy, abrasive liquids with solids in suspension.
Often used for smaller wellpointing applications such as installing small pump chambers, where a vacuum prime centrifugal pump is too large.
The system consists of a diaphragm guided by a coupling rod. The flow generated by the movement of the diaphragm is controlled by check valves at the suction and delivery.
As the diaphragm rises away from the bottom of the casing it produces a vacuum which draws the liquid into the casing through the suction valve. When the diaphragm is on the downstroke, the liquid is expelled through the delivery valve.
Caffini Diaphragm Pump - Honda engine
|Model||Solids (mm)||Max Head (m)||Max Flow (l/min)||Engine|
|Caffini Lib 1-3||50||15||330||Honda GX160|
|Caffini Lib 1-4||60||15||500||Honda GX270|
|Caffini Lib 2-6||60||15||800||Honda GX390|
Diaphragms made from
No rotating part or seal in
Helical cut gears reduces
Heavy rubber check valves
Chamber on the suction side
Caffini models have either
Only a few spare parts
Cast iron, aluminium,