Modulating pressure operated pilot relief valve

Details Modulating pressure operated pilot relief valve Modulating pressure operated pilot relief valve

G - Physics

05

D

137/39.1

G05D 16/00 (2006.01) F16K 17/10 (2006.01) G05D 16/16 (2006.01)

Patent

CA 1286192

Page 27 MODULATING PRESSURE OPERATED PILOT RELIEF VALVE Abstract of the Disclosure A main valve (16) includes a product pressure inlet (18), an outlet (20), 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 (14) that includes a piston chamber (36) with a reciprocally mounted pilot piston (42). The chamber is in fluid communication with the pressurized head volume and with the outlet and inlet of the main valve. An inlet valve (92) controls flow from the inlet of the main valve into the chamber and is actuated by the pilot piston. The pilot piston includes first and second surfaces (46) and effective areas .delta. A 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 (138) 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 (154) 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 (150) is positioned within the test valve between the field test valve inlet and second outlet. An alternate embodiment of the pilot valve (206) disclosed utilizes a piston (226) operating intermediate a pressure setting spring (234) and main valve head volume (222) vent valve, and having a single pressure sensing chamber (235). The operating piston includes an elongated extension (229) of reduced diameter extending from the piston adjacent the sensing chamber and incorporates an opposite end, secondary relief chamber (230) providing main valve operation at pressures fixedly Page 28 related to the operating piston relief setting. The piston extension operates the vent valve (245) in an adjacent chamber. The piston further defines an internal cavity (240) containing a somewhat coaxial inlet valve (251), (252). Inlet and exhaust valves are in fluid communication through said piston extension. Main valve head volume venting and pressurizing is accomplished through valve body ports cooperating with said inlet and exhaust valves. Product backflow, and main valve head volume repressurization are prevented through the use of ported check valves internal of the pilot operating piston.

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