Two line pilot valve
AssigneeBarber Industries Ltd.
InventorClarence W. Johnson
Life of this patent
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Abstract
A two line pilot valve used to exhaust hydraulic fluid from a control circuit when the operating conditions within which a flowline is intended to operate are outside of predetermined limits. The pilot exhausts fluid within a control circuit to a reservoir which allows a dump valve to dump fluid from an actuator which causes the actuator to close the flowline. The pilot has a first poppet sleeve which contacts an o-ring. When the poppet sleeve and o-ring separate, fluid is allowed to pass from the inlet port of the pilot to the exit port and thereby exhaust the fluid of the control circuit.
Claims16
A two-line pilot valve to operatively sense the pressure in a flowline, said pilot comprising a body operable to be mounted to a base housing, a pushrod movable within said base housing and body, an inlet port and an outlet port, a first poppet sleeve mounted on said pushrod, a first poppet sleeve shoulder on the inside circumference of said first poppet sleeve operable to interact with a first pushrod flange on the outside circumference of said pushrod, a spring operable on said first poppet sleeve to urge said first poppet sleeve shoulder into a contacting relationship with said first pushrod flange, a first core ring mounted about said pushrod, a first o-ring mounted on said first core ring and being operable to simultaneously contact one end of said first poppet sleeve and the inside circumference of said body, an inlet port operable to admit fluid to a circumferential cavity surrounding said poppet sleeve and defined on one end by said first o-ring of said core ring and at the opposite end by a seal between said body and said first poppet sleeve, said outlet port communicating with said inlet port to thereby exhaust fluid through said pilot valve when said first poppet sleeve is out of contact with said first o-ring of said first core ring.
A control and actuator circuit used to terminate flow in a flowline, said circuit comprising an actuator adapted to move between a first position wherein said flowline is open and a second position wherein said flowline is closed, a first circuit operable to provide hydraulic fluid to and to allow exit of hydraulic fluid from said actuator and a control circuit operable to sense the pressure of said flowline and to initiate the closure of said actuator, said control circuit including a two line pilot valve operable to exhaust hydraulic fluid from said control circuit to a reservoir when the pressure within said flowline falls outside predetermined operating limits and a dump valve operably initiated by said control circuit to exhaust the hydraulic fluid within said first circuit and said actuator when said pilot valve exhausts hydraulic fluid in said control circuit to said reservoir.
A control and actuator circuit used to terminate flow in a flowline, said circuit comprising an actuator adapted to move between a first position wherein said flowline is open and a second position wherein said flowline is closed, a first circuit operable to provide hydraulic fluid to and to allow exit of hydraulic fluid from said actuator and a control circuit operable to sense the pressure of said flowline and to initiate the closure of said actuator, said control circuit including a two line pilot valve operable to exhaust hydraulic fluid from said control circuit to a reservoir when the pressure within said flowline falls outside predetermined operating limits, a dump valve operably initiated by said control circuit to exhaust the hydraulic fluid within said actuator when said two-line pilot valve exhausts hydraulic fluid in said control circuit to said reservoir, said two line pilot valve comprising a body operable to be mounted to a base housing, a pushrod movable within said base housing and body, a spring housing operatively connected to said body, a first sleeve movable on said pushrod, a first sleeve flange on the inside periphery of said first sleeve operable to interact with a first pushrod flange on the outside circumference of said pushrod, a spring operable on said first sleeve to urge said first sleeve flange into a contacting relationship with said first pushrod flange, a core ring mounted about said pushrod having a first o-ring operable to contact the outside circumference of one end of said first sleeve, an inlet port operable to admit fluid to an area surrounding the circumference of said first sleeve and an outlet port operable to communicate with said inlet port to exhaust fluid when said first sleeve is out of contact with said first o-ring.
Dependencies are inferred from the claim text.