Flow force compensation

Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves

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Details

91448, 91468, F16D 3102

Patent

active

054470935

ABSTRACT:
In load sensing systems, pressure compensating valves are normally used to maintain a predetermined pressure differential across the orifices in the directional control valve at a predetermined level. The predetermined pressure level acting across the directional control valve can be adversely affected by flow forces acting on a valving element of the pressure compensating valve. In the subject invention, flow force compensation is provided by having a forced balancing device connected to a pressure compensated valve device so that a force that is directly proportional to the degree of flow forces acting on the pressure compensating valve device is transferred to a valving element thereof in opposition to the flow forces that are acting on the valving element. The subject arrangement is also applicable to providing flow force compensation for negative load pressure compensating valve devices. By having flow force compensation that is directly responsive to a predetermined differential pressure across a directional control valve, the predetermined pressure differential thereacross can be more precisely maintained regardless of varying load conditions in the fluid system.

REFERENCES:
patent: 3777773 (1973-12-01), Tolbert
patent: 3982469 (1976-09-01), Bianchetta
patent: 4180098 (1979-12-01), Budzich
patent: 4282898 (1981-08-01), Harmon et al.
patent: 5062350 (1991-11-01), Tanaka et al.
patent: 5083430 (1992-01-01), Hirata et al.
patent: 5150574 (1992-09-01), Hirata et al.
patent: 5285642 (1994-02-01), Watanabe et al.
patent: 5333449 (1994-08-01), Takahashi et al.

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