| 摘要 |
A lock apparatus for attachment to the top of an input pipe communicating with a storage tank includes an open-ended cylindrical housing for mounting to the top of the input pipe, a valve assembly pivotally mounted in the housing with a valve activating axle protruding through an orifice in the housing, and a locking mechanism. The valve assembly includes at least one valve plate with a seal member provided around the edge of the valve plate for sealing the space between the edge of the valve plate and the cylindrical housing when the valve assembly is closed. The locking mechanism includes a latch pivotally attached to the protruding end of the axle, a lock flange attached to the outside of the housing and a tamper prevention flange above and in linear alignment with the axle and the latch to prevent unauthorized tampering with the axle and attached latch. The latch may be coupled to the lock flange and locked to maintain the valve in the closed position across the interior of the housing.
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