Sealing valve for gas bottle

摘要

A gas bottle or other such pressurised gas container is fitted with an openable sealing valve which in a closed condition prevents escape of gas from the bottle. The valve comprises a body 14 forming a convergent outlet passage 18 and a movable valve member 22 which in the closed condition is urged against the body to seal the passage. The valve member presents a continuous sealing edge 32 which is formed by a material (e.g. acetal resin) which is hard but sufficiently compressible to be spread slightly by compression against the body to form a seating but is insufficiently soft for it to be extruded away from the edge in repeated operation of the valve. The valve member is allowed some latitude for movement laterally of the passage, permitting self-centring of the member.