Relay valve assembly

Details Relay valve assembly Relay valve assembly

1987-04-20

1988-10-11

Kashnikow, Andres

Fluid-pressure and analogous brake systems

Load control

Responsive to fluid pressure spring

303 2, 303 40, B60T 818, B60T 1502

Patent

active

047766484

ABSTRACT:
A relay valve is provided within a single housing and includes a brake cylinder relay valve with combined highway override, a dual pressure brake cylinder limiting valve responsive to load, highway supply line and rail supply line charge check valves and a rail reservoir protection valve. The brake cylinder relay valve includes a valve spool positioned by a first piston responsive to the control signal from a control valve to determine the flow to the brake cylinder and a second piston responsive to the highway supply line to connect the brake cylinder to exhaust. The limiting valve includes a first piston responsive to load signals to define the first set of limits and a second piston in tandem with the first piston responsive to load signals and emergency brake signal in the brake pipe for increasing the response of the first piston to the load signals in response to an emergency signal on the brake pipe.

REFERENCES:
patent: 2178928 (1939-11-01), Campbell
patent: 2861843 (1958-11-01), Bentz et al.
patent: 3125379 (1964-03-01), Valentine
patent: 3136588 (1964-06-01), McClure
patent: 3275380 (1966-09-01), May
patent: 3730597 (1973-05-01), Pickert
patent: 4202276 (1980-05-01), Browne et al.
patent: 4202277 (1980-05-01), Browne et al.
patent: 4387933 (1983-06-01), Cripe
patent: 4421360 (1983-12-01), Newton

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