PILOT RELAY VALVE WITH LOAD PISTON

摘要

2117896 9322173 PCTABS00027 A relay valve (10) for a fluid pressure braking system includes a relay piston (16) and a load piston (34) which is responsive to the pressure at the inlet port (38) of the relay valve to exert a biasing force on the relay piston loading the latter against the inlet/exhaust valve (56). The biasing force is opposed by fluid pressure at the inlet port acting across the effective area of the inlet/exhaust valve. The biasing force is greater than the spring force holding the inlet/exhaust valve closed, so that the valve responds immediately to pressure signals transmitted through the control port of the relay valve.