Two-stage valve

Details Two-stage valve Two-stage valve

1992-09-25

1993-08-31

Look, Edward K.

Power plants

Pressure fluid source and motor

Pulsator

605471, 303 71, 303 842, F15B 700, B60T 1300

Patent

active

052398285

ABSTRACT:
A two-stage brake control valve has a larger first stage and a smaller second stage. First stage operates to fill a brake. Then, after a transition phase only the second stage is used to supply the working pressure. A check valve is between the first stage pressure chamber a sump. The check valve opens if the pressure in the first stage pressure chamber exceeds a predetermined value. To minimize the operating force of the valve and to avoid a sudden change of the valve working pressure during the changing phase, the closing force of the check valve is controlled as a function of the valve working pressure. The valve working pressure acts on a valve spool which influences the closing force of the check valve in the way that the closing force decreases with increasing working pressure.

REFERENCES:
patent: 4262969 (1981-04-01), Chatterjea
patent: 4738109 (1988-04-01), Miller et al.
patent: 4963692 (1990-10-01), Halabiya
patent: 5020864 (1991-06-01), Tanaka
patent: 5076647 (1991-12-01), Grana et al.
patent: 5152588 (1992-10-01), Bright et al.

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