Cross line relief valve mechanism

Details Cross line relief valve mechanism Cross line relief valve mechanism

1985-08-30

1986-07-01

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

137493, 1374939, F16K 1718

Patent

active

045974101

ABSTRACT:
A cross line relief valve mechanism includes a pair of opposed relief valves contained in a bore connecting the service passages of a control valve. A high pressure condition in one of the service passages acts directly on the main poppet of one of the relief valves causing it to become unseated and communicating the high pressure condition to a zone in the bore between the two relief valves. The high pressure condition in this zone acts on the pilot poppet of the other relief valve causing it to open which results in the unseating of the main poppet in that relief valve. The high pressure condition in one of the service passages thus results in the opening of both valves so as to allow high pressure fluid to flow from one service passage to the other in order to obtain a balanced condition.

REFERENCES:
patent: 3194261 (1965-07-01), Tennis
patent: 3313316 (1967-04-01), Thomas
patent: 3362430 (1968-01-01), Olen
patent: 3506031 (1970-04-01), Stacey
patent: 4476890 (1984-10-01), Kawasaki

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