Relief valve

Details Relief valve Relief valve

1999-06-11

2000-11-07

Rivell, John

Fluid handling

Line condition change responsive valves

Direct response valves

137514, 251 53, F16K 1706

Patent

active

061421766

ABSTRACT:
A relief valve, including a case having an inner bore, and an opening defining an outlet; a valve seat adjacent to a forward end of the case, the valve seat defining an inlet, a plunger slidably disposed within the case and pressed forward by a spring to shut off fluid communication between the inlet and the outlet, a piston slidably disposed within the case, and slidably receiving the plunger, the piston being configured for pushing forward a rear end of the spring, and which piston moves forward with the increase in the pressure at the inlet to compress the spring, thereby regulating a relief pressure, wherein the piston further comprises a first sliding portion configured for sliding with liquidtightness in the inner bore of case, and a sliding bore formed along a central axis of the piston, a rear portion of the plunger slidably inserted and fitted in the sliding bore formed along a central axis of the piston, and the plunger further comprising a through hole configured for feeding a pressurized liquid from the inlet to the rear of the plunger, and wherein the piston further comprises rearward acting face and a forward acting face, and the piston moves by a difference between the combined rearward acting forces given to a bottom face of the sliding bore and the rearward acting face by the pressurized liquid, and forward acting force given to the forward acting face by the pressurized liquid.

REFERENCES:
patent: 4051864 (1977-10-01), Iwatsuki
patent: 5638860 (1997-06-01), DeRoche
patent: 5669356 (1997-09-01), Wall et al.
patent: 5975129 (1999-11-01), Williams

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