Control valve arrangement

Details Control valve arrangement Control valve arrangement

B - Operations, Transporting

60

T

251/12, 303/34

B60T 17/00 (2006.01) B60T 15/18 (2006.01) B60T 15/42 (2006.01)

Patent

CA 1205504

ABSTRACT A control valve arrangement adapted to produce and maintain a pilot signal comprises a number of standard modules. The basic element has two standard modules, each of which includes a diaphragm-controlled on-off valve. An input signal is applied to a first valve against a reference pressure such that when the valve is on, a signal is generated and held as a pilot pressure. A second valve responds to a fall in input signal pressure to cancel out pilot pressure. The two valves together constitute a bistable operator. A particular use of this operator is in a railway braking system in which the first valve is used as an application valve and the second valve is used as a release valve. A third module may be used as a pilot pressure-maintaining valve.

410461

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