| 摘要 |
A pressure relief valve for the control of pressure in a pressure vessel comprising a body and a piston 12 and cylinder 17 assembly in the body. The piston is coupled to a valve element 14 controlling pressurised fluid flow past an associated valve seat, and the valve element is biased by a spring 18 to a valve closing position. The piston is at least partially isolated from influence of said pressurised fluid, and pressure sensitive means (30 Fig. 2, not shown) controls application of pressurised fluid to said piston when said valve element is lifted from its seat whereby said valve element is lifted to its full extent from the seat for maximum relief. <IMAGE> |
