Proportioning brake valve with dual area secondary piston

Details Proportioning brake valve with dual area secondary piston Proportioning brake valve with dual area secondary piston

1986-04-03

1987-04-28

Reger, Duane A.

Fluid-pressure and analogous brake systems

Motorman's valves

Equalizing

303 7, 303 40, B60T 1512

Patent

active

046608940

ABSTRACT:
A dual circuit brake valve includes a relay piston (50) having primary (82) and secondary (84) areas which are normally communicated to the pressure level at the primary outlet or delivery port (18). The relay piston (50) responds to a pressure differential across the relay piston to control communication to the secondary outlet or delivery port (22). A control mechanism (92) is responsive to a control signal to vent the secondary area (84) to thereby establish a differential area across the relay piston (50), so that the relay piston (50) will establish a pressure level at the secondary outlet or delivery port (22) which is a predetermined fraction of the pressure level at the primary outlet or delivery port (18).

REFERENCES:
patent: 2985489 (1961-05-01), Stelzer
patent: 3413042 (1968-11-01), Herold
patent: 3504698 (1970-04-01), Frill
patent: 3637054 (1972-01-01), Billeter
patent: 3730597 (1973-05-01), Pickert
patent: 4230373 (1980-10-01), Plantan
patent: 4261624 (1981-04-01), Plantan
patent: 4383717 (1983-05-01), Bueler
patent: 4387933 (1983-06-01), Cripe
patent: 4453779 (1984-06-01), Bridigum
patent: 4498712 (1985-02-01), Hart
patent: 4530544 (1985-07-01), Joseph
patent: 4553789 (1985-11-01), Pugh et al.

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