Valve opening and closing failure

    The poor opening and closing of the valve manifests itself as the valve cannot be opened or closed, and the valve cannot operate normally. The reasons are: the valve stem is rusted; the gate is stuck or the gate is rusted in the closed state for a long time; the gate is detached; the foreign matter is stuck in the sealing surface or the groove; In the above circumstances, repair and lubricate the transmission parts; repeatedly open and close the valve and hydraulically impact foreign bodies; replace the valve.