| 摘要 |
A coupling comprises a socket and a plug removably connected thereto. In the socket and the plug, a first fluid passage and a second fluid passage are formed, respectively. An on-off valve chamber, a first packing chamber and a second packing chamber are arranged in succession in the socket. An elastic packing member and a sealing member are disposed in the first and second chambers, respectively, so that their adjacent surfaces are pressed against each other. An on-off valve chamber having a cylindrical valve body is located in the on-off valve chamber in such a manner that the valve body can approach the first packing chamber and recede from it. It is urged toward the packing by a compression coil spring. An abutment which abuts against the packing is formed on an intermediate portion of the valve body. A communication passageway is provided in the portion of the valve body between the abutment and the free end of the valve body in order to effect communication between the first and second fluid passages through it when the on-off valve is opened. The plug has an insertion section inserted into the socket. As the insertion section is inserted into the socket, it presses the valve body and allows the abutment to be separated from the packing to thereby to permit communication between the first and second fluid passages.
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