Fluid valve device and a positive-displacement pump

Details Fluid valve device and a positive-displacement pump Fluid valve device and a positive-displacement pump

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 43/02 (2006.01) F16K 7/17 (2006.01)

Patent

CA 2084681

ABSTRACT OF THE DISCLOSURE A fluid valve device for on-off control of fluid through a passage extending between two fluid ports and including a valve seat comprises a hollow valve member which is movable into and out of sealing engagement with the valve seat and defines a valve chamber. The valve chamber communicates with one of the fluid ports through the valve seat and is associated with a valve member actuating device which translates the pressure of the fluid received in the valve chamber from an inlet for the fluid flow into a force acting on the valve member to displace it relative to the valve seat. The valve member actuating device in one embodiment includes a thrust surface on the valve member which is directed away from the valve seat and forms part of the wall of the valve chamber. A second thrust surface on the valve member is directed oppositely and defines a chamber 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 of the fluid being pumped.

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