Low pressure selector

Details Low pressure selector Low pressure selector

1976-09-09

1977-08-30

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

303 6C, 188151A, 116 65, B60T 1722

Patent

active

040457680

ABSTRACT:
A low pressure selector for communicating therethrough fluid from the lower pressure source of a pair of pressure sources includes a housing with input ports for connection to the pressure sources and an output port. A piston member is mounted within a cavity, advantageously formed by walls of the housing, for reciprocating movement therein in response to pressure supplied from the pair of pressure sources to the input ports. Sealing members provided on the piston member cooperatively operate with the walls of the housing cavity and the piston member, to effectuate communication of fluid from the lower pressure source to the output port. The low pressure selector is advantageously employed in a vehicle pneumatic brake system to communicate the fluid from the lower pressure source of first and second sources of supply pressure of the system to a low pressure responsive monitor which warns the operator of the vehicle of a drop in supply pressure from either source below a preset minimum.

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