Two-stage valve

Details Two-stage valve Two-stage valve

B - Operations, Transporting

60

T

B60T 11/28 (2006.01) B60T 11/224 (2006.01) B60T 11/26 (2006.01)

Patent

CA 2079137

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.

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