| http://www.w3.org/ns/prov#value | - e the volume of the expansion chamber when the valve closure member is in its closed position and to decrease the volume of the expansion chamber when the valve closure member is in its open position; biasing means in the housing for urging the valve closure member toward its open position; means for supplying a pressurized medium, other than the fluid of said fluid system, to the expansion chambe
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