Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Reexamination Certificate
2007-01-30
2007-01-30
Keasel, Eric (Department: 3753)
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
C251S285000
Reexamination Certificate
active
11118655
ABSTRACT:
Disclosed is a two-port valve in which a fluid passage between two ports is gradually openable without a rapid flow rate, by stepwise lifting a valve member off a valve sent using two pistons, to open the valve in a phased manner. A cylinder portion2for driving a valve member4has a first piston24through which a valve shaft11slidably extends, a sleeve35movably disposed in a second pressure chamber27to limit an operating stroke of the first piston24, and a second piston37slidably disposed in the sleeve35and connected to the shaft11. In an initial phase of opening of the valve, the pistons24, 37acting like a unit are together moved to a position at which the first piston24contacts the sleeve35, to slightly open the valve member4. Thereafter, the valve member4is moved by the second piston37to its fully open position.
REFERENCES:
patent: 6244563 (2001-06-01), Ejiri
patent: 6494229 (2002-12-01), Kajitani
patent: 6814338 (2004-11-01), Kajitani
patent: 08-166085 (1996-06-01), None
Ganjian Peter
Keasel Eric
SMC Corporation
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