| 摘要 |
The safety closing equipment of a valve (1) which contains sealing plug (3) with linear movement, is controlled by a control shaft (13) driven by a motor shaft (14) mounted on an extension of the control shaft (13) and joined to it by a detachable joining piece (16). It is made up of internal pieces which ensure the joining between the control shaft (13) and the motor shaft (14) when held together by an external shroud (17) around the control shaft (13). The external shroud (17) is connected to an external actuator (18) independent of the valve (1), which operates by sliding the external shroud (17) around the control shaft (13) in a manner to liberate the internal pieces (50,51) and only then to move along the control shaft (13).
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