PLUG STRUCTURE FOR COUPLER

摘要

A projected connection section (32) to be connected with a socket (S10) is provided at a plug body (31) of a plug (P10), and a valve seat (33) is provided in the plug body. A valve body (35) having a valve head (35a) that is urged to the valve seat (33) to seal it is placed in the plug body (31) and the projected connection section (32). Break-off start sections (71, 72) are arranged at at least portions of the projected connection section (32) and/or a valve stem (35b). The break-off start sections (71, 72) previously determine Positions where a break-off occurs when a force exceeding a normal use range is applied are determined in advance by the break-off start sections (71, 72), and even if the break-off occurs, sealing between the valve seat (33) and the valve head (35a) can be maintained.