| 摘要 |
<p>The invention relates to a valve characterised in that the inside end of the hollow rod carries a hollow closing block that can slide over the reduced end of the rod and through the liquid chamber of the fastening body, acting as a mobile piston. A first spring mounted on the hollow rod acts on the mobile piston, said spring generating the closing action of the mobile block over a step of the liquid chamber, while a second spring acts on the end of the hollow rod, in the opposite direction to that of the first spring, until, in the absence of any manual opening action, the slidable closing block acts as a closing abutment against the inner step of the chamber of the manual fastening body.</p> |
