Pressure responsive fluid valve assembly

Claim 1

A fluid pump comprising: a fluid inlet manifold, a fluid outlet manifold spaced from the inlet manifold; a number of fluid piston and cylinder assemblies spanning the distance between said manifolds and operable to sequentially pump fluid from the inlet manifold to the outlet manifold when the pistons of said assemblies are reciprocated in respective cylinders thereof; means coupled with the pistons of said assemblies for sequentially reciprocating the same; a fluid pressure regulator, said regulator including a barrel; means on said manifolds for mounting the barrel thereon in spanning relationship thereto and in fluid communication therewith; a fluid valve within the barrel and including a pair of valve members, one of which is movable; means biasing the valve members toward each other, each valve member having a working face, the working faces of the valve members being in face-to-face relationship, the working face of at least one of said valve members having a tapered configuration to define there between a transversely wedge-shaped annular space having a maximum separation at the outer periphery in the range of 0.0001 inch to 0.01 inch, when the valve members are closed, one of the valve members having an orifice extending thereinto from the working face thereof, said working faces being engageable with each other to block said orifice and thereby close said valve,; means placing the orifice in fluid communication with the inlet manifold; and means placing the outlet manifold in fluid communication with a region adjacent to the outer peripheries of said working faces, each working face having an effective length from its outer periphery to its center of at least 1.5 times the radius of the orifice.