| 摘要 |
A quick-action shut-off value includes a valve member normally urged by the inlet pressure to close a valve seat, a movable carrier member normally urged towards the valve seat by a biassing spring, but moved away from the valve seat by the inlet pressure, and a lost-motion connection between the valve member and carrier member effective, when the carrier member and the valve member are in their initially closed positions with respect to the valve seat and the inlet pressure increases, to permit the inlet pressure initially to move the carrier member away from the valve seat while the valve member is held to the valve seat by the inlet pressure, until the lost-motion connection is taken-up, whereupon the carrier member moves the valve member away from the valve seat to open the valve.
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