| 摘要 |
<p>A container (10) for pressurised fluid, e.g. carbon dioxide, is fitted with a self-sealing valve (11) comprising a valve body (12), a valve stem (13) mounted in the valve body for axial movement relative thereto, and a valve member (14) connected to the inner end of the valve stem. A first 'O' ring seal (21) creates a seal between the valve stem and the valve body and a second 'O' ring seal (25) creates a seal between the valve member and the valve body under the urging force of pressurised fluid in the container. The valve stem has an axially extending discharge passage (19) which communicates with the outside of the valve stem at a position intermediate the seals (21 and 25) and a valve operating member (33) is threadably connected to the valve body so that when it is turned in an appropriate direction the operating member engages with an abutment (37) on the valve stem to move the valve stem and valve member against the urging force of the pressurised fluid to break the seal between the valve member and the valve body and so allow fluid within the container to pass through the discharge passage in the valve stem. The valve member is equipped with a pressure relief valve which includes a burstable metal disc (29).</p> |
