Hydraulic amplifiers with reduced leakage at null

Details Hydraulic amplifiers with reduced leakage at null Hydraulic amplifiers with reduced leakage at null

1994-03-23

1995-08-22

Nilson, Robert G.

Fluid handling

Pressure modulating relays or followers

137 83, F15B 500

Patent

active

054430895

ABSTRACT:
An improved fluid amplifier (39) is operatively arranged in a flow path extending between a source (28, 31) of pressurized fluid (P.sub.s) and a fluid return (38) at a return pressure (R). The amplifier has at least one fluid connection (34 or 35) to a load. The amplifier has a movable mechanical member (24) operatively arranged to control the pressure at, and flow with respect to, the load. The mechanical member has a displacement range encompassing a null position and an off-null position. The improvement broadly includes a variable-impedance orifice (42 and/or 43) arranged in series with the amplifier in the low path. The impedance of the orifice is varied such that the impedance is a maximum when the mechanical member is in the null position and is a minimum when the mechanical member is in off-null position, such that flow from the supply to the return when the mechanical member is in the null position will be less than the maximum flow between the amplifier and the load.

REFERENCES:
patent: 2798461 (1957-07-01), Gold
patent: 2881740 (1959-04-01), Ensinger
patent: 2919681 (1960-01-01), Shultz
patent: 2931343 (1960-04-01), Moog

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