Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1989-07-17
1990-06-12
Chambers, A. Michael
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
1375133, 137517, 137529, 13761416, F16K 1700
Patent
active
049324357
ABSTRACT:
The problem of controlling overspeed and/or oscillation of a variable displacement hydromechanical actuation system is solved by a multi-stage flow regulating valve (18) which includes a valve body (20, 22) having a fluid inlet (24) and a fluid outlet (26) defining a flow path (A,B) through the valve body. A first stage valve piston (30) is reciprocally mounted within a cylinder (28) in the valve body (20) in the flow path between the inlet and the outlet for restricting fluid flow in response to a first range of incoming fluid pressure. The first stage piston (30) has an inlet orifice (34) exposed to the incoming fluid and an outlet port (36) in registry with the outlet (26) of the valve body (20). A second stage valve piston (44) is reciprocally mounted within the first stage piston (30) and has an orifice plate (46) for covering the inlet orifice (34) of the first stage valve piston (30). The orifice plate has smaller orifices (48) for further restricting fluid flow through the valve body. The first stage piston is loaded by a spring (38) defining a first range of incoming fluid pressure and the reference pressure on the second stage valve piston defines a second range of incoming fluid pressure to provide a distinct multi-level range of regulating pressures.
REFERENCES:
patent: 3170481 (1965-02-01), Presnell
patent: 3399692 (1968-09-01), Hebert
patent: 3464439 (1969-09-01), Budzich
patent: 3672167 (1972-06-01), Griesenbrock
patent: 3794077 (1974-02-01), Fanshier
patent: 3872884 (1975-03-01), Busdiecker et al.
patent: 4279268 (1981-07-01), Aubert
patent: 4437493 (1984-03-01), Okuda et al.
Stroze Mark S.
Tsai Shan-Chin
Chambers A. Michael
Sundstrand Corporation
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