A locking device for water valves having an actuation mechanism that couples to the water valve nut to secure the water valve. The shaft portion is rotatably received in a bore formed in the first locking member. A rotational force, inputted to the input member, can be transmitted to or cut-off from the output member via pressure-contact or release between the driving clutch plates and driven clutch plates. When the state of a step does not satisfy the specification, the refinement system identifies a step whose widening operator was the source of the state that did not satisfy the specification and applies a more precise operator that eliminates the problem with the widening. Only when the first intelligent inching switch and the second intelligent inching switch are pressed down simultaneously, the left riveting cylinder and the right riveting cylinder can be started to drive the left riveting die and the right riveting die to rivet the brush holder and the brush holder plate which are positioned on the positioning mechanism. The neighbor list comprises a list of identifiers of radio access point devices that are candidates for handover of service.