Valves and valve actuation – Fluid actuated or retarded – Dashpot or fluid controlled retarder or timer
Patent
1994-11-28
1995-09-19
Walton, George L.
Valves and valve actuation
Fluid actuated or retarded
Dashpot or fluid controlled retarder or timer
251 52, F16K 2104, F16K 31143, F16K 4702
Patent
active
054510309
ABSTRACT:
A metering valve includes a valve body with an inlet passage and an outlet passage defined therein, and a movable stem member disposed between the inlet passage and outlet passage. An inner sleeve member is configured within the valve body and has an inner diameter surface defining a chamber, the stem member being movable through the chamber. A piston assembly is disposed within the chamber and is configured with the stem member to move therewith. The piston assembly includes a sealing device which engages with the inner sleeve member inner diameter surface during movement of the piston assembly to the closed mode. A metering passage is defined through the stem member between a location above the sealing device to a location below the sealing device such that the rate of return of the piston assembly from the open mode to the close mode is dependent upon the size of the metering passage. At least one additional vent passage is defined from a location above the sealing device to a location below the sealing device in the closed mode. The vent passage includes at least one hole defined above the sealing device completely through the inner sleeve member, and at least a second hole defined below the sealing device completely through the inner sleeve member. The vent passage is only established upon the sealing device passing across the second hole in its movement from the open mode to the close mode.
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Ashton Craig
Reglebrugge Michael
T&S Brass and Bronze Works, Inc.
Walton George L.
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