VALVE DEVICE

摘要

PURPOSE:To ensure shutting-off of gas in abnormalities by bonding radially a valve rubber to a valve stem provided with a flat top to provide a structure determining the axial position of the valve rubber by an abutting portion having smaller diameter than said top. CONSTITUTION:A valve rubber 15 formed with a valve seat surface 12 abutting against a holding shoulder 8, a central aperture 13 adhering radially closely to a seal groove and a projection 14 on the rear side of the seat surface 12 is fitted onto a valve stem 11 provided with a flat top. Thus, the valve can be easily swung to absorb the inclination of mounting surfaces and a valve seat surface so that gas enclosing property is improved and gas can be positively shut off in abnormalities.