| 摘要 |
<p>The invention relates to a door closer, particularly to relief valve constructions for door closer fluid. A valve (1) according to the invention includes a gasket groove (3) fitted with a gasket (4), which is arranged to allow the door closer fluid to emerge from the door closer so that the gasket groove (3) allows the gasket (4) to protrude from the groove and/or break once the fluid pressure within the door closer reaches a certain level.</p> |
