Controlled prevention of premature snuffle valve actuation in hi

Details Controlled prevention of premature snuffle valve actuation in hi Controlled prevention of premature snuffle valve actuation in hi

1995-05-16

1997-08-12

Gluck, Richard E.

Pumps

Motor driven

Fluid motor

F04B 4314

Patent

active

056558945

ABSTRACT:
A hydraulically driven membrane pump, particularly a high pressure membrane pump, having a membrane which is held on its edges by a clamp between a pump housing and a pump cover, which membrane separates a pumping space from a hydraulic compression space, and may particularly be a metal membrane. A hydraulic membrane drive in the form of a reciprocating displacement piston is slidably mounted in a cylindrical bore in the pump housing, which piston is disposed between the compression space and a reservoir space for the hydraulic fluid. A leak replenishment device including a snuffle link in the form of a connecting channel between the compression space and the reservoir space, which snuffle link is normally closed off by an underpressure-controlled spring-loaded snuffle valve. The snuffle link between the compression space and the reservoir space is controlled via the position of the piston, wherewith the piston serves as the slide element of a slide valve which blocks the snuffle link between the compression space and the reservoir space, at least at the beginning of the suction stroke of the piston, and only opens the link when the piston has been retracted through a part of its suction stroke.

REFERENCES:
patent: 2902936 (1959-09-01), Bradley
patent: 3277829 (1966-10-01), Burgert
patent: 3354831 (1967-11-01), Acker et al.
patent: 4365745 (1982-12-01), Beck
patent: 4430048 (1984-02-01), Fritsch
patent: 5246351 (1993-09-01), Horn

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