Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1999-06-01
2000-12-19
Michalsky, Gerald A.
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
G05D 1616
Patent
active
061615706
ABSTRACT:
A pilot operator and a relief valve are provided in the same housing. The pilot-operating mechanism is contained partially within the main closure element of the valve and partially within the valve cap. Inlet pressure to the valve is communicated to the pilot via an access passage extending through the main closure element. In response to high-pressure flow from the inlet, a pilot piston moves a spacer rod through the passage and into engagement with a spring-loaded vent closure. The piston-induced movement of the rod opens the vent to relieve the pressure behind the main closure element, which in turn permits the main closure element to open and relieve the inlet pressure through the valve outlet. Opening of the main closure element terminates flow through the access passage. When the inlet pressure is sufficiently reduced, the pilot piston is unseated by the spring force re-opening the access passage to allow the pressure behind the main closure element to increase and close the main closure element. A back-flow-prevention assembly carried in the main closure element prevents reverse flow of fluids from the outlet to the inlet when the outlet pressure exceeds the inlet pressure.
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Michalsky Gerald A.
Tyco Flow Control, Inc.
LandOfFree
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