| 摘要 |
A housing in which a locking tube is contained is threaded into a suitable threaded opening in the valve casing with the opening communicating with the interior of the casing adjacent the seal piston; the locking tube is threaded within the housing and is engageable with the seal piston to lock the seal piston against the valve insuring positive sealing engagement; a detector push-rod is axially movable within the locking tube and is spring loaded against the seal piston; when sealing has been effected, the push-rod effects the actuation of a limit switch to initiate the operation of a signal device.
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