Patent ID: 8627851

Claim:
A rebuildable multi-position valve assembly factory pre-adjusted to operate at a calibrated operating pressure P C , comprising: a valve housing; a stator element defining a stator face; a rotor element rotatably mounted about a rotational axis, said rotor element defining a rotor face disposed opposite said stator face, at a rotor-stator interface; and a pre-adjusted pressure adjustment assembly movable between a release position and a hard stop position, hard stopped relative to said valve housing and biasing said valve assembly to operate substantially at said calibrated operating pressure, P C , said pressure adjustment assembly including: a pressure adjuster device; a retainer member movably disposed between said valve housing and said pressure adjuster device for movement of the pressure adjustment assembly between the release position and the hard stop position, said pressure adjuster device configured to movably cooperate between at least one of the rotor element and the stator element, and the retainer member, in the hard stop position to adjustably generate an axial compression pressure between the stator face and the rotor face at said calibrated operating pressure, P C , to enable fluid-tight, selective relative rotation between the rotor face and the stator face between two or more rotor positions when said pressure adjustment assembly is oriented in the hard stop position; and a lock structure configured to lock the pressure adjuster device relative to the retainer member, when the pressure adjuster device is oriented in a factory adjusted set position at said calibrated operating pressure, P C , such that said pressure adjuster device and said retainer member move together as a single unit, wherein, when said pressure adjustment assembly is oriented in said release position, the axial compression pressure between said stator face and said rotor face is substantially removed from said rotor-stator interface, and wherein, when said pressure adjustment assembly is oriented in said hard stop position, the axial compression pressure between said stator face and said rotor face is substantially reproduced at said calibrated operating pressure, P C .