The Bendix Corporation

Bendix Westinghouse Limited

Sidney A Lippiatt

David John Knight

A pressure reducing valve is constricted with a stepped piston affording a pressure responsive area on one side responsive to the pressure at an output port and a smaller pressure responsive area on the other side, contained between the seals of the two piston diameters and responsive to the pressure at an input port, the piston carrying a self lapping valve assembly connected via a passage to the smaller area for controlling the pressure at the output port in relation to that at the input port.

Proportioning valve with pressure port communicating with stepped area

A tractor/trailer vehicle fluid pressure braking control system enabling two line control of trailer service and secondary braking includes for tractor braking a service brake control valve for controlling the fluid pressure applied both to service brake actuators and to a trailer service brake control line, a secondary control valve which controls the magnitude of a counteracting pressure applied to tractor spring brakes and also to a relay valve which controls a pressure in a trailer secondary spring brake control line.

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Bath, United Kingdom

Sidney A Lippiatt