| 摘要 |
<p>PURPOSE:To prevent gas leak at the time of closing a master plug one and reopening it by providing a pressing means for detaching a socket and a locking means at a plug provided with an automatic blocking seal valve, and releasing the lock by the lowering of pressure on the upstream side. CONSTITUTION:A plug 6 is provided with a seal valve 10 so as to be opened by inserting a socket 9. A pressing member 19 for detaching the socket 9 is provided at the plug 6 in such a way as to be moved by a spring 20. There are also provided with a locking means A for holding the pressing member 19 and a socket automatic detaching means B for releasing the hold. The locking means A is formed by fitting a locking member 27 at a pressure receiv ing plate 21, and the socket automatic detaching means B is formed of a dia phragm 22 and the pressure receiving plate 21. When a master plug is closed, the pressure is lowered so as to release the lock and close the seal valve 10. The seal valve is not opened even if the master plug is reopened, thereby preventing gas leak to obtain safety.</p> |
