Measuring and testing – Fluid pressure gauge
Reexamination Certificate
2009-04-13
2010-06-22
Thompson, Jewel (Department: 2855)
Measuring and testing
Fluid pressure gauge
Reexamination Certificate
active
07739914
ABSTRACT:
A system and method of preloading a valve tester control assembly circuit includes a valve testing control apparatus comprising a fluid supply, a motor, and a fluid control assembly controlling working fluid flow from the fluid supply to the motor. The fluid control assembly comprises an operation valve fluidly connected to the fluid supply, an adjustable pressure-responsive valve fluidly connected to the operation valve, and a preload valve fluidly connected between the pressure-responsive valve and the motor. The method includes closing the preload valve so that fluid does not pass through the motor, opening the operation valve so that the fluid supply is in fluid communication with the pressure-responsive valve, operating the fluid supply to supply fluid to the pressure-responsive valve, and adjusting the pressure-responsive valve so that a pressure-sensing gauge in fluid communication with the pressure-responsive valve senses a desired maximum pressure for the fluid during testing of a valve.
REFERENCES:
patent: 4114426 (1978-09-01), McLean
patent: 4174733 (1979-11-01), Eidsmore et al.
patent: 4278864 (1981-07-01), De Facci et al.
patent: 5398721 (1995-03-01), Pryor
Proehl Jeffrey A.
Thompson Jewel
Woods, Fuller, Shultz & Smith P.C.
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