Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1983-04-21
1985-08-20
Yuen, Henry C.
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
137492, 1374925, F16K 3112
Patent
active
045358052
ABSTRACT:
A pilot operated valve is disclosed which may be used, for example, in a refrigerant system to control the flow of refrigerant therethrough. The valve has a pilot operated main valve therein which is selectively actuable by a solenoid. With the pilot valve closed, fluid pressure from the inlet side of the valve acts on the main valve so as to positively hold the main valve closed against a valve seat thereby to block the flow of refrigerant through the valve. The pilot valve member is biased toward its closed position both by a spring and by any fluid pressure within the valve downstream from the valve seat. Fluid pressure upstream from the valve seat acts on the pilot valve member so as to exert an opening force thereon. Upon the pressure differential across the main valve seat exceeding a predetermined value, the fluid pressure upstream from the valve seat acting on the pilot valve member overcomes the closing forces exerted on the pilot valve member and therefore opens the pilot valve member to relieve pressure from the back face of the main valve which in turn causes the main valve to open.
A method of relieving pressure from a pilot operated valve is also disclosed.
REFERENCES:
patent: 3250293 (1966-05-01), Adams et al.
patent: 3362679 (1968-01-01), Le Wan
patent: 3806081 (1974-04-01), Otto
patent: 3807438 (1974-04-01), Posipsek
Emerson Electric Co.
Kwon John
Yuen Henry C.
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