Bi-directional pressure relief valve

Details Bi-directional pressure relief valve Bi-directional pressure relief valve

1992-02-11

1992-09-01

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

1374545, F16K 1718

Patent

active

051431157

ABSTRACT:
The bi-directional pressure relief valve comprising a valve casing defining a valve bore, a valve chamber at one end of the valve bore and a pressure chamber communicating with the opposite end of the valve bore. The valve chamber has a first port communicating with a first fluid line and a second port communicating with a second fluid line and the first port having a valve seat coaxial with the bore with a cross-sectional area smaller than the cross-sectional area of the valve bore. A poppet type valve member is slidable in the bore and has a reduced end portion engageable with the seat to shut off flow between the first and second fluid lines and a spring yieldably urges the valve member to a closed position. A first chamber vent passage communicates the pressure chamber with the first fluid line and first check valve in the first vent passage is arranged to close and block flow from the first fluid line to the pressure chamber when the fluid pressure at the first fluid line is greater than the fluid pressure in the pressure chamber. A second chamber vent passage communicates the pressure chamber with the second fluid line and a second check valve in the second vent passage is arranged to close and block flow from the second fluid line to the pressure chamber, when the fluid pressure at the second fluid line is greater than the fluid pressure in the pressure chamber.

REFERENCES:
patent: 4228818 (1980-10-01), Nelson
patent: 5072752 (1991-12-01), Kolchinsky
Crossover Relief Valve A6A60 by Sterling Hydraulics Limited (date unknown but prior to 1991) undated.
Crossover Relief Valves A6A125, A6B125 by Sterling Hydraulics Limited (date unknown but prior to 1991) undated.

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