Fluid handling – Line condition change responsive valves – Pop valves
Patent
1978-11-06
1980-03-11
Weakley, Harold W.
Fluid handling
Line condition change responsive valves
Pop valves
137508, 1375123, 1375125, F16K 1720
Patent
active
041923430
ABSTRACT:
The housing of a pressure-relief valve has an inlet port forming an inlet valve seat, an outlet port, a valve chamber between the ports, and an abutment in the valve chamber. A valve body in this chamber has an inlet end engageable in the inlet valve seat and an outlet end, and is displaceable in the housing between a closed position with its inlet end seated in and blocking the inlet valve seat and an open position engaging the abutment and with its inlet end spaced from the inlet valve seat. A pilot piston in the valve chamber has a throughgoing passage opening at one end at the outlet port and forming at its opposite end an outlet valve seat engageable with the outlet end of the valve body. This piston is itself displaceable in the housing between an open position with its outlet valve seat spaced from the outlet end of the valve body in either position thereof and a closed position with its outlet valve seat engaging and blocked by the outlet end. A spring urges this piston into the closed position. The effective area of the valve body is considerably smaller than that of the piston so that the pressure at which the valve opens is considerably higher than that at which it closes.
REFERENCES:
patent: 2050853 (1936-08-01), Murphy
patent: 3975116 (1976-08-01), Feild
patent: 4082104 (1978-04-01), Keeney
Ross Karl F.
Weakley Harold W.
Woma-Apparatebau Wolfgang Maasberg & Co. GmbH
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