| 摘要 |
A locking valve having a housing and a valve element movable with respect to the housing to selectively occlude a passageway through the housing. Stops on the outside of the housing normally limit movement of the valve element to a first range of positions encompassing a normal closed position and a normal open position. An interior locking mechanism concealed within the housing is operative to arrest the valve upon its movement to one of such positions. The interior locking mechanism is also operative to arrest the valve element upon its movement to a position outside of the normal or first range of positions. Thus, the interior locking mechanism cannot be defeated by removing the exterior stops and moving the valve element beyond its normal range of positions. The interior locking mechanism prevents removal of the valve element, and the interior locking mechanism is protected from forcing or picking.
|
