Fluid handling – Systems – Multi-way valve unit
Patent
1992-03-24
1993-08-17
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762548, 13762564, 251 3002, F16K 1102, F16K 31124
Patent
active
052360156
ABSTRACT:
A position controlled proportional directional control valve has a main control piston for controlling flow between passages to a pump, a tank, and to passages which may be connected to an operative device, such as a hydraulic motor. The main control piston may be moved in one direction by an operating piston slidably disposed in a centring flange which serves as a mechanical stop for movement of the main control piston in the opposite direction. Acting on the end of the main control piston opposite the operating piston is a centring piston having one end in a pilot control chamber, and which may urge the main control piston against the centring flange either by pressure fluid in the chamber, or upon failure of pressure, by the spring in the chamber. A pilot control valve, under the control of an electrical magnet, moves proportionally to the current in the electrical magnet, to admit fluid under pressure from a pump passage into the pilot control chamber.
REFERENCES:
patent: 2615466 (1952-10-01), Garde
patent: 3339573 (1967-09-01), Bahniuk
patent: 3757823 (1973-09-01), Knutson
patent: 3783901 (1974-01-01), Schneider et al.
patent: 4593719 (1986-06-01), Leonard
Hydrolux S.a.r.l.
Michalsky Gerald A.
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