| 摘要 |
<p>The invention relates to a refillable CO2 gas cylinder that comprises a valve (1) for drawing and refilling CO2. Said valve comprises a valve housing (2) with a connection thread (2b) and a valve bore (3) in which a valve body (4) is received and can be axially displaced. Said valve body is spring-biased towards the exterior against a sealing seat (8) and adjoins an exterior actuation pin (6). The invention also relates to a pertaining filling device and to a filling method. The aim of the invention is to better protect the cylinder against being unrightfully refilled, especially not by simply connecting the cylinder to a high pressure CO2 source. To this end, the inventive valve body (4) forms a piston-cylinder unit together with an axially displaceable locking member (5). Said piston-cylinder unit can be impinged upon with CO2 pressurized gas via an overflow channel (11) that leads through the valve body (4) to the exterior. The locking member (5) can be axially extended towards the interior until it buts against a stop (2c) in the valve bore (3).</p> |
