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Class Information
Number: 137/630.18
Name: Fluid handling > Systems > Sequentially progressive opening or closing of plural valves > Screw-actuated differential valves
Description: Systems in which (1) at least one of the valves is screw actuated and the remaining valve or valves are biased so that as the screw is actuated one of the valves is moved to or from its seated position and further actuation of the screw in the same direction then moves the remaining valve or valves, against the bias, to or from the seated position, or (2) both valves are screw actuated by a common operator and a lost motion connection is provided between the two movable valve elements or between one of the valve elements and its screw actuator.

Patents under this class:

Patent Number Title Of Patent Date Issued
7240694 Flow control valve for refrigeration system Jul. 10, 2007
6957661 Valve with pressurization rate reduction device Oct. 25, 2005
6901962 Surge prevention device Jun. 7, 2005
4266573 Anesthesia machine having proportion limiting control system May. 12, 1981

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