Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1981-08-05
1984-05-01
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
137492, 137557, F16K 3136
Patent
active
044455313
ABSTRACT:
For use with a safety relief valve, a pilot valve is disclosed. The preferred and illustrated embodiment of the pilot valve incorporates a pressure moved spindle within a housing, the housing being drilled and incorporating a valve and valve seat mechanism. The device is adapted to be connected to a high pressure inlet source. In addition, it has a flow path from the inlet through a needle orifice. This needle orifice chokes the flow into an outlet port. The outlet is provided for controlling a safety relief valve. A third path past the valve element is included which conducts fluid to an exhaust port. A coil spring forms a force in one direction for the valve element while the inlet line pressure forms a force in the opposite direction. When the inlet pressure is sufficiently high, the valve element is moved, thereby opening the valve. This embodiment is enhanced by indicating the operative position which is monitored by a pressure driven differential area piston having a protruding plunger which provides an output indication indicative of the operative state of the valve.
REFERENCES:
patent: 3406671 (1968-10-01), Weise
patent: 3699991 (1972-10-01), Munch
patent: 4203467 (1980-05-01), Cardi
patent: 4285362 (1981-08-01), Taylor
Agco, "Safety Relief Valves", Anderson, Greenwood & Co., Catalog 1531, Jul. 1980.
Anderson Greenwood & Co.
Cohan Alan
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