B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/87
B60T 13/28 (1980.01)
Patent
CA 1123028
ABSTRACT The specification discloses a unitary valve for controlling air pressure in a towed vehicle's air brake system and includes a housing, a supply pressure inlet to the housing, first and second reservoir ports in the housing, a first check valve between the supply pressure inlet and the first reservoir port, a second check valve between the supply pressure inlet and the second reservoir port, relay valve means in the housing, a control inlet in the housing to the relay valve means, a pressure inlet to the relay valve means, a third check valve between the first reservoir and the pressure inlet, a fourth check valve between the second reservoir and the pressure inlet, a parking brake outlet in the housing from the relay valve means, the relay valve means being operative for connecting pressure from its pressure inlet to its parking brake outlet in response to pressure in its control inlet, a feedback outlet in the housing and means for placing the feedback outlet in pressure communication with the pressure at the pressure inlet.
382731
Macrae & Co.
Wagner Electric Corporation
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