| 摘要 |
A valve or valve assembly for inclusion in an emergency air supply line to the trailer braking system of an articulated vehicle, the valve having: ```an air inlet, connectable to an upstream side of the emergency air supply line; ```an air outlet, connectable to a downstream side of the emergency air supply line; ```a closing member, biased towards a closed position in which passage of air through the valve between the air inlet and air outlet is substantially prevented; ```operating means for opening the closing member; wherein the valve also includes ```control means for retaining the closing member in an open position on receipt of an electrical signal, the signal being derived from an electrical braking system of the vehicle. When such a valve is included in the emergency air supply line to a trailer braking system, the emergency braking system is not deactivated automatically when the emergency line is connected, by virtue of the closing member being biased towards a closed position which prevents passage of air through the valve. Rather, the emergency braking system is deactivated only when the operating means are activated, eg by operation of the foot brake. |
