with one lift valve being actuated to initiate the flow through the coupling after the two coupling parts are locked against withdrawal

Full Title

Couplings of the quick-acting type ( radially-binding sleeves F16L17/04, F16L21/06; connecting hoses to rigid members F16L33/00) > with fluid cut-off means > with fluid cut-off means in only one of two pipe-end fittings > with one lift valve being actuated to initiate the flow through the coupling after the two coupling parts are locked against withdrawal