As a displacement element, they have an elastic diaphragm whose axial movement is caused either by a direct drive by means of a drive rod or indirectly by transmitting the displacement pressure of a plunger.
In the positive displacement pump the movement of the fluid is forced by reducing the volume of the pump chamber.
Read more Screw pumps belong to the group of rotary positive displacement pumps.
Read more Plunger pumps have a displacement body (plunger) which performs an axial movement in the pump working chamber.
Read more Rotary lobe pumps belong to the group of rotary positive displacement pumps.
Read more Reciprocating piston pumps (also oscillating pumps) are a group within the positive displacement pumps where the volume of the pump chamber is periodically changed by an axial movement of the inner part (piston).
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