| 摘要 |
<p>Pressure relief apparatus for ensuring that the pressure of fluid in a vessel does not exceed a known maximum value, comprising a bursting disc assembly (10) together with a pressure relief valve means (40), there being a sealed interspace (76) between the assembly (10) and the valve means (40). The apparatus also includes indicator means (56,74) for indicating when the pressure in said interspace (76) reaches a first known minimum value, while said valve means, (40) includes secondary relief valve means (54) which permit flow of fluid therethrough from the interspace (76) when the pressure in said interspace (76) reaches a further known value at least equal to said first known value but less than said known maximum value, and primary relief valve means (46) which permit flow of fluid therethrough from the interspace (76) when the disc (12) of the assembly (10) bursts. Preferably the primary and secondary relief valve means (46,54) and the indicator means (56,74) are incorporated in a single valve unit (40).</p> |
