The products,installed in the water pipeline and other pipelines to avoid stealing ,look the same as the ordinary ones but install concealed clutch device on the internal valve stem ,which is mysterious when the special key is inserted into the bolt holes to adjust the on-off state, then control handwheel switch valve.Benefits and Features:Special wrench locking valve:It is simple and convenient to use special wrench switch valve.Resilient Seated Gate Valves with lock:It has high level of safety that each valve,with lock device, can only be turned on with different keys.
