Patent ID: 7174910

Claim:
A valve core for opening and closing a core mounting throughbore, comprising: a cylindrical core body fixed inside the throughbore and having a distal opening; a moving shaft inserted through the core body so as to be directly moved and having an end; a plug formed integrally at the end side of the moving shaft so as to open and close the distal opening of the core body; a biasing member biasing the moving shaft so that the distal opening of the core body is closed by the plug; a cylindrical sealing member; an outer sealing portion formed integrally on the cylindrical sealing member and fitted with the outer periphery of the core body so as to be held between the core body and the inner wall of the throughbore thereby to adhere closely to the outer periphery of the core body; and an inner sealing portion formed integrally on the cylindrically sealing member so as to adhere closely to an outer face of the plug, the inner sealing portion including a cylindrical portion with a distal end and a cylinder side taper formed by gradually spreading a distal end side inner diameter of the cylindrical portion, and the plug includes a columnar portion fitted into the cylindrical portion of the inner sealing portion and a shaft side taper adhering closely to the cylinder side taper.