Positive-displacement pump with inlet float chamber

Details Positive-displacement pump with inlet float chamber Positive-displacement pump with inlet float chamber

1994-12-23

1996-06-18

Bertsch, Richard A.

Pumps

Expansible chamber type

Valve in collapsible wall pumping member

417490, 417507, F04B 4300

Patent

active

055271642

ABSTRACT:
A fluid valve device for on-off control of fluid flow through a passage extending between two fluid ports (12, 15) and including a valve seat (17A) comprises a hollow valve member (21) which is movable into and out of sealing engagement with the valve seat and defines a valve chamber (20). The valve chamber (20) communicates with one of the fluid ports (15) through the valve seat (17A) and is associated with a valve member actuating device (A) which translates the pressure of the fluid received in the valve chamber (20) from an inlet (12/14) for the fluid flow into a force acting on the valve member to displace it relative to the valve seat (17A). The valve member actuating device in one embodiment includes a thrust surface (A) on the valve member (21) which is directed away from the valve seat and forms part of the wall of the valve chamber (20). A second thrust surface (C) on the valve member (21) is directed oppositely and defines a chamber (V) which is isolated from the valve chamber and the flow passage. A positive-displacement pump includes the fluid valve device as an inlet valve for controlling the admission into the pump chamber (20) of the fluid being pumped.

REFERENCES:
patent: 2593316 (1952-04-01), Kraft
patent: 2811929 (1957-11-01), Rupp
patent: 3804113 (1974-04-01), Garcea
patent: 3811803 (1974-05-01), Frohberg
patent: 4737083 (1988-04-01), Meyer
patent: 4922955 (1990-05-01), Uri
patent: 5004002 (1991-04-01), Kobayashi
patent: 5085400 (1992-02-01), Petersen

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