Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1989-11-14
1990-10-23
Chambers, A. Michael
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 44, 1374545, 13750535, F16K 3112
Patent
active
049646117
ABSTRACT:
Valve for pressurized media which includes a valve housing provided with inlet and outlet and a movable main valve plug for infinitely variably controlling the pressurized medium flow through the valve with the aid of a pilot flow originating from the pressurized medium flow and passing through a variable throttling means situated in the main valve plug. For obtaining a compact valve unit, the pilot flow control valve (18) is arranged in a member arranged as a lid on a cartridge sleeve including the valve housing, for opening or closing a pilot flow duct (15) in the cartridge in response to a control signal, a pressure compensation means (54) being arranged in the duct (15) after the throttling means (26) in the main valve plug (5) but before the pilot flow control valve (18), this means (54) being under the action of the pressure in the pilot flow duct (15) prevailing after the throttling means (26) and of a piston sensing the pressure in the valve inlet and/or outlet for throttling or interrupting the pilot flow before the pilot flow control valve (18) in response to pressure changes in the inlet or outlet.
REFERENCES:
patent: 2439523 (1948-04-01), Miller et al.
patent: 2635636 (1953-04-01), Carson, Jr.
patent: 2693823 (1954-11-01), Sogge
patent: 3433262 (1969-03-01), Ray
patent: 3451431 (1969-06-01), Royer
patent: 3474811 (1969-10-01), Blair
patent: 4305566 (1981-12-01), Grawunde
patent: 4699351 (1987-10-01), Wells
Bahco Hydrauto AB
Chambers A. Michael
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