Fluid handling – Line condition change responsive valves – Direct response valves
Reexamination Certificate
2007-06-05
2007-06-05
Keasel, Eric (Department: 3753)
Fluid handling
Line condition change responsive valves
Direct response valves
C137S516250, C137S543230
Reexamination Certificate
active
11054506
ABSTRACT:
A fluid control valve having a spring biased shuttle plunger member which opens or closes fluid flow through a plurality of radially spaced apart fluid passageways disposed between an upstream chamber and downstream chamber in the valve body responsive to a fluid pressure greater than the spring force and any differential pressure between the upstream and downstream chambers to prevent fluid from being supplied at a pressure higher than a desired operating pressure and prevent high dynamic differential pressures, such as a “water hammer” or explosive pressure. Alternatively, in a normally closed embodiment, pilot fluid at a pressure greater than the spring force and any differential pressure in the upstream chamber is utilized to open the valve, which is then closed by the spring force.
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Keasel Eric
Roddy Kenneth A.
Rost Andrew J.
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