Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1986-05-19
1988-12-20
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
137492, G05D 1600
Patent
active
047919558
ABSTRACT:
A main valve includes a product pressure inlet, an outlet, a movable closure member and a pressurized head volume above the closure member. Product pressure relief flow through the main valve is controlled by a modulating, pressure operated pilot relief valve that includes a piston chamber with a reciprocally mounted pilot piston. The chamber is in fluid communication with the pressurized head volume and with the outlet and inlet of the main valve. An inlet valve controls flow from the inlet of the main valve into the chamber and is actuated by the pilot piston. A vent valve is mounted within the piston chamber and controls fluid flow from the piston chamber to the outlet of the main valve and is actuated by the pilot piston. The pilot piston includes first and second surfaces and effective areas exposed to the pressure in the piston chamber and an end isolated from the piston chamber and in fluid communication with the main valve inlet. A field test valve is also included with an inlet for the introduction of test pressure. The test valve includes a first outlet in fluid communication with the inlet and a poppet valve mounted between the inlet and first outlet. The field test valve further includes a second outlet in fluid communication with the field test inlet and the inlet of the main valve. A shuttle valve is positioned within the test valve between the field test valve inlet and second outlet.
REFERENCES:
patent: 2849987 (1958-09-01), Shafer
patent: 2877791 (1959-03-01), Rich
patent: 3083726 (1963-04-01), Woelfel
patent: 4129141 (1978-12-01), Vogeli
patent: 4384590 (1983-05-01), Friend
patent: 4615356 (1986-02-01), Reip
Cohan Alan
Dresser Industries Inc.
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