Patent ID: 7146824

Claim:
A valve plug threadedly engaged thereby to be inserted from an open end of a passage for charging with and/or releasing from a compressed fluid toward an inner part of the passage, thereby closing a smaller diameter portion, the valve plug comprising: a threadedly engaging member threadedly engaging a portion of the passage located nearer to the open end side than the smaller diameter portion; a turn head turnably connected to an end of the threadedly engaging member and having a distal end inserted into the smaller diameter portion so as to adhere closely to an open edge of the smaller diameter portion; a support shaft protruding from either one of the threadedly engaging member and the turn head toward the other, the support shaft having a distal end formed with a flange and a cylindrical portion formed so as to protrude from said other of the threadedly engaging member and the turn head toward said one of the threadedly engaging member and the turn head, wherein the flange is accommodated in the cylindrical portion and the cylindrical portion has a distal end inwardly bent so that the turn head is turnably connected to said one end of the threadedly engaging member; and wherein the cylindrical portion has an inner face and the flange has an end face, said inner face and said end face being opposed to each other, the valve plug further comprising an elastically compressible member provided between the inner face of the cylindrical portion and the end face of the flange.