| 摘要 |
<p>This invention relates to a valve arrangement for filling a pressure vessel with hydraulic fluid under pressure and for relieving fluid under pressure from the vessel at a predetermined pressure above the filling pressure wherein the valve arrangement comprises a one-way pressure relief valve which are carried by a common valve arrangement body which is located wholly within the pressure vessel, in use, and a hydraulic fluid inlet adaptor which is fixed, in use to the outer wall of the vessel with a single fluid passage extending, in use, between a fluid inlet to the adaptor and the inlet into the valve arrangement body for delivering hydraulic fluid under pressure to the filler valve and through which hydraulic fluid is vented from the pressure relief valve at or above the predetermined fluid pressure in the pressure vessel and to a mine support preload device including the valve arrangement.</p> |
