Patent ID: 8297593
Filing Date: 2012-10-30
Classification: F16K

Abstract:
1. Valve for bottles of pressurised or liquefied gas, comprising: a valve body comprising a gas flow channel; a first sealing seat in said gas flow channel; an obturating member having a free end provided with a shoulder; an annular seal mounted on said free end of the obturating member, said annular seal having a front end face facing said first seat and a rear end face resting on said shoulder of said obturating member; wherein said free end of said obturating member comprises a radial end projection penetrating radially into an internal annular shoulder of said annular seal, said free end being tapered, narrowing from said shoulder in the direction of said radial projection; a holding ring circumferentially surrounding said annular seal and comprising a radial lip that bears on the outer edge of said front end face of said annular seal; said obturating member being able to be moved axially towards said first seat into a first sealing position, in which said annular seal is pressed against said first seat such that it ensures the main gas-tightness of the valve; wherein said annular seal comprises an external annular shoulder encircling its front end face; said radial lip of said holding ring carries an axially protruding annular bead facing said external annular shoulder of said annular seal; and said holding ring is fixed to the obturating member by an external circumferential gas-tight weld, such that said annular bead penetrates axially into said external annular shoulder of said annular seal to compress it.