Importance

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Abstract

A valve assembly is provided, including at least a first valve unit and a second valve unit. The first valve unit is movably mounted within the second valve unit, and includes a first valve housing defining a first valve volume. The second valve unit includes a second valve housing defining a second valve volume different from the first valve volume. The second valve housing includes at least one first port and at least one second port. The first valve unit includes a first valve element reciprocably movable with respect to the first valve seat to selectively open and close a first fluid path through the first valve volume, and a first mechanical biasing element. The second valve unit includes a second valve element reciprocably movable with respect to the second valve seat to selectively open and close a second fluid path through the second valve chamber, the second valve element being affixed to first valve housing for reciprocal movement therewith; and a second mechanical biasing element. The first valve unit is connectable to a reciprocable actuator element, the first valve element and the second valve elements being reciprocally movable responsive to reciprocal movement of the reciprocable actuator element to selectively open the first flow path and the second flow path, respectively.

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First Claim