Assertion: relay's output | /r/HasProperty | directed towards the trailer relay valve
Facets:
value: in tractors
type: OTHER
Source sentences:
text: In tractors that are not equipped with a trailer hand valve, only the merged outputs of the foot-valve (i.e., via a single two-way check valve) are directed towards the trailer relay valve; however, the fact that the foot-valve's delivery-port outputs are still merged enables the trailer's service brakes to still be controlled even if there is failure within one braking circuit of the tractor.