Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1998-03-31
1999-10-26
Hepperle, Stephen M.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
G05D 701
Patent
active
059710128
ABSTRACT:
A valve comprises a valve body having an inlet and an outlet defining a flow passage through the valve body. A piston is mounted in a bore intersecting the flow passage and the piston divides the bore into first and second chambers. The piston remains substantially motionless during upstream pressure fluctuations after the desired fluid flow rate through the valve has been established. A reference pressure passage communicates with the inlet and the first chamber of the bore. Springs in the second chamber bias the piston against the fluid pressure from the first chamber. A sleeve on the piston is configured to variably sheath a cover over the outlet such that reciprocation of the piston during initiation of fluid flow through the valve varies the effective area of openings in the cover to achieve the desired differential pressure across the flow control throttle, thus setting the flow rate constant unless the throttle position is changed.
REFERENCES:
patent: 562131 (1896-06-01), Gordon
patent: 3643685 (1972-02-01), Hays
patent: 4098285 (1978-07-01), Karing
patent: 5107886 (1992-04-01), Taylor
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