Patent ID: 7299897

Claim:
A positive displacement valve for use in a hydraulic circuit, the positive displacement valve comprising: a pair of longitudinally-moveable, spaced-apart pistons, each operatively connected by longitudinal shaft means to each other so that movement of one piston causes an equal movement of the other, each situated within a corresponding cylinder member, the cylinder members arranged in juxtaposed relation to each other, each cylinder member having mutually opposed ends and an aperture proximate each of the opposed ends thereof so as to permit ingress and egress of a pressurized hydraulic fluid to and from said cylinder members, respectively; and piston phasing means integral with at least one of the cylinder members comprising at least one egress port situated in said at least one cylinder member proximate at least one opposed end of said at least one cylinder member, said egress port together with an associated aperture forming a pair of apertures proximate the at least one opposed end of said at least one cylinder member, said egress port operable to permit egress of at least some of the pressurized hydraulic fluid that is ingressing into the as least one cylinder member.