Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1991-02-06
1992-03-31
Hepperle, Stephen M.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
F16K 1724
Patent
active
050998757
ABSTRACT:
A flow limiter for use in association with a control valve for minimizing flow losses in an actuator control system to provide unrestricted control over the flow up to the desired maximum flow quantity value. A cylindrical sleeve is mounted within a housing and a piston is slidably contained within the sleeve to establish a variable chamber between the front wall of the piston and the back wall of the sleeve. A series of circumferentially spaced metering ports are contained in the variable chamber which are opened and closed by the piston. A control orifice is formed in the front wall of the piston and a biasing spring is arranged to act on the piston outside the flow path of the fluid to normally hold the piston in a home position wherein the metering ports are fully opened. The spring allows the piston to move toward a second position when the pressure over the orifice reaches a predetermined value, thus closing the metering ports to maintain the flow at a desired flow. The size of the control orifice to minimize the pressure drop over the orifice when the flow is below the desired maximum value.
REFERENCES:
patent: 3170481 (1965-02-01), Presnell
patent: 3381708 (1968-05-01), Chenoweth
patent: 3630228 (1971-12-01), Turner et al.
patent: 3752183 (1973-08-01), Griswold
patent: 4080993 (1978-03-01), Lind
patent: 4112978 (1978-09-01), Olbrich et al.
Hepperle Stephen M.
Moog Controls Inc.
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