Dual position pilot operated valve assembly

Details Dual position pilot operated valve assembly Dual position pilot operated valve assembly

2011-03-15

2011-03-15

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

C251S030010, C251S030020, C251S030030

Reexamination Certificate

active

07905467

ABSTRACT:
A dual position pilot operated valve assembly having a main piston, with a valve member, reciprocable within a valve body, wherein the valve body is adapted for sealingly mating with a valve seat and passage located intermediate the valve body inlet and outlet ports, the valve body having a cylindrical adapter secured to an open end thereof and housing a secondary piston, reciprocable therein, with an axial stem depending from the second piston bottom surface and extending through the adaptor to the first piston cavity for intermittent contact therewith; and an end cap secured to and closing the adapter and having an inlet port interconnected with a source of high pressure control gas and respective first and second conduits leading to the main and secondary piston bore cavities, with an adjustment mechanism controlling the degree of opening/closing of the valve assembly. Several methods of operation are also set forth.

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