Relay valve for a tow vehicle-trailer braking system

Details Relay valve for a tow vehicle-trailer braking system Relay valve for a tow vehicle-trailer braking system

1975-05-01

1976-10-05

Schwadron, Martin P.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Activation of one path disables second path

60546, 91412, 303 7, 303 40, 1376275, F15B 1304

Patent

active

039837874

ABSTRACT:
A relay valve for transmitting an operational signal to a first brake applying servomotor in a trailer upon actuation of a second brake applying servomotor in a tow vehicle. The relay valve has a housing with a movable wall which sequentially interrupts the communication of vacuum to a power chamber in the first brake applying servomotor and thereafter allows air to be communicated to the power chamber. With air in the power chamber, an operational pressure differential will be developed which will operate the first brake applying servomotor.

REFERENCES:
patent: 3117822 (1964-01-01), Blair
patent: 3667815 (1972-06-01), Zoppi
patent: 3771838 (1973-11-01), Rossigno
patent: 3790807 (1974-02-01), Rossigno
patent: 3856362 (1974-12-01), Howard
patent: 3856363 (1974-12-01), Kasselmann
patent: 3893692 (1975-07-01), Presley
B400,310, Kasselmann et al., "Pressure Differential Trailer Braking System", 1/28/75.

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