Hydraulic circuit including pressure compensating valve

Details Hydraulic circuit including pressure compensating valve Hydraulic circuit including pressure compensating valve

1992-09-14

1995-04-25

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91446, 13759613, 13759614, F15B 1302

Patent

active

054090385

ABSTRACT:
A hydraulic circuit including a pressure compensating valve, which aims at preventing the delay in operation of the valve due to the time required for the inflow of fluid in amount corresponding to stroke volume thereof, thereby improving the response of thereof. This hydraulic circuit includes a pressure compensating valve (3) provided between the delivery side of a hydraulic pump (1) and the inlet of a directional control valve (4), the pressure compensating valve (3) being arranged to be urged by the pressure applied to first pressure receiving portion (6) to position (D) where the area of opening thereof is kept maximum, and also urged by the pressure applied to second pressure receiving portion (8) to position (E) where the area of opening thereof is kept minimum, the portions (6) and (8) being connected with the outlet and inlet sides of the valve (4). The circuit includes a hydraulic cylinder (30) adapted to push the valve (3) to the position (D) and whose piston elongating chamber (31) is connected with an exterior pressurized fluid supply (11) and whose piston retracting chamber (34) is connected with the portion (6) so that when the valve (4) is located at neutral position (A) the valve (3) is held at position (D).

REFERENCES:
patent: 3937129 (1976-02-01), Miller
patent: 4967557 (1990-11-01), Izumi et al.
patent: 5056312 (1991-10-01), Hirata et al.
patent: 5062350 (1991-11-01), Tanaka et al.
patent: 5083430 (1992-01-01), Hirata et al.
patent: 5134853 (1992-08-01), Hirata et al.
patent: 5146747 (1992-09-01), Sugiyama et al.
patent: 5150574 (1992-09-01), Hirata et al.
patent: 5152143 (1992-10-01), Kajita et al.

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