Relay valve device

Details Relay valve device Relay valve device

1986-04-09

1987-07-14

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Motorman's valves

Multiple motors

303 40, 303 84R, B60T 1506, B60T 1518, F15B 1102

Patent

active

046798650

ABSTRACT:
A relay valve device having a first control surface and a second control surface. A shut-off device is located in the line feeding the control pressure into the second control surface throughout the period in which a signal pressure is present, and connecting the second control surface to atmosphere at other times. Thus, the relay valve device releases a greater pressure into a load circuit when actuated during effectiveness of the signal pressure than while the signal pressure is not effective. The shut-off device having a pressure relief valve with a switch-off device so that when the signal pressure is effective, the switch-off device switches OFF the pressure relief function of the pressure relief valve and so that when the signal pressure is not effective, the pressure relief valve is opened as long as the control pressure remains below the relief pressure and is closed when the control pressure moves above the relief pressure.

REFERENCES:
patent: 3941432 (1976-03-01), Blanz
patent: 3992065 (1976-11-01), Pekrul
patent: 4116492 (1978-09-01), Reinecke
patent: 4418965 (1983-12-01), Reinecke
patent: 4498710 (1985-02-01), Smith
patent: 4575157 (1986-03-01), Reinecke
patent: 4609230 (1986-09-01), McCann

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