| 摘要 |
<p>An automatic emergency stop apparatus which prevents counter flow and counter fire of gas bodies. The apparatus comprises a check valve, a cut-off valve and a filter unit. The check valve is positioned in the gas inlet portion of a decomposable closed-type valve casing. The check valve is opened only by inflow gas pressure. The cut-off valve engages with a portion of a safety apparatus operated by counter pressures created during counter flow and counter fire conditions. The safety apparatus causes the cut-off valve to automatically stop the flow of gas upon the application of counter pressure. The cut-off valve is positioned in the apparatus gas outlet. The filter unit, which is adapted to buffer the counter pressures caused during the production of the counter fire and to remove carbon sludges, is interposed between the check and cut-off valves.</p> |
