The burner cooling water shut-off valve cannot be closed

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This post was last edited by xklcj on 2015-8-6 at 12:31. The inlet and outlet shut-off valves for the burner cooling water serve as an important safety interlock mechanism in the gasification furnace; they isolate the furnace in case the cooling water coils are punctured, thereby preventing the leakage of hot raw gas. However, several plants have found that when this interlock is triggered, the inlet and outlet valves for the burner cooling water fail to close completely due to factors such as high back pressure. As a result, raw gas leaks into the burner cooling water pipelines, causing them to overheat or even get punctured and lead to leaks. Should any tests be conducted before installing these shut-off valves to ensure that they can close completely and accurately in the event of a leak or high pressure difference, thus ensuring the safety of the gasification furnace? What measures should be taken, and what kind of testing should be conducted prior to installation, to ensure that the burner cooling water shut-off valve can still close properly under the most severe operating conditions? For example, methods such as increasing the instrument air pressure of the cut-off valve or enlarging the cylinder of the cut-off valve to increase torque! I hope everyone can discuss this and share any good experiences that others might find useful to learn from!