Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Reexamination Certificate
2005-02-15
2005-02-15
Jacyna, J. Casimer (Department: 3751)
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
C251S062000
Reexamination Certificate
active
06854705
ABSTRACT:
A valve is formed to resist snap-action closure forces and provides a smooth closing action to minimize or eliminate water hammer. The valve is opened and closed by modulating the relative air pressures above and below a piston in the valve. Because the air pressures above and below the piston produce partially offsetting forces on the piston, the net closure force on the valve plunger is limited, and the rate of valve closure is reduced enough to achieve the effect of minimizing water hammer. A separate vent port volume may vent to atmosphere to further limit valve closure speed, and to further reduce water hammer. The valve can provide the capability to control the flow of fluids over a wide temperature range over a long service life while reducing or eliminating water hammer. The valve is well suited for use in injection mold temperature control systems.
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Yokota Manufacturing Co., Ltd., Non-Water Hammer Check Valve (Mar. 21, 2002), available at http://www.aquadevice.com/english/04valve13slsn2.htm.
CITO Products, Inc.
Foley & Lardner LLP
Jacyna J. Casimer
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