Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Patent
1995-03-31
1997-08-12
Thorpe, Timothy
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
417360, 417548, 417554, 92255, 92128, F04B 5316
Patent
active
056558856
ABSTRACT:
A double-displacement pump is compact, has a modular fluid subassembly made up a substantially cylindrical pump body and a piston reciprocally driven within the pump body. An outlet fluid cavity is formed between the pump body and a surrounding housing structure, enabling the subassembly to be removed as a unit without the need to disconnect auxiliary systems, such as a pressure control system or a priming system. In a preferred embodiment, the subassembly is retained within the housing structure by an inlet fitting which includes a check valve. A second check valve is then provided in the piston itself, which has a stem threadingly engaged with a reciprocal drive element. A sleeve received over the stem serves to compress a fluid sealing structure against a flange of the piston when the stem is fully engaged with the drive element.
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McAndrews, Jr. Roland G.
Thorpe Timothy
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