Selection of valves for drain inlets and vent outlets

Refer to process requirements. It is related to pressure, temperature, and pipe diameter. Plug welding should work, as these types of valves offer the best sealing performance. For reference. Note: When installing such valves, the valve head must be removed. Avoid heating the sealing material and causing it to deform due to welding heat. It is best to use absorbent materials to cool down.

In actual production, due to certain factors that cause internal leakage in the valves, socket-welded gate valves make it impossible to install double valves or blind covers, and the leakage issue cannot be addressed immediately

It is best not to use socket weld valves. As mentioned on the 2nd floor, there are numerous instances of internal leakage in valves during actual production, often requiring repairs, valve replacements, or the use of blind flanges to stop the leakage. The repair and replacement of socket-welded valves involve working with open flames, which increases the difficulty of maintenance. Due to safety requirements, the drain and vent valves on toxic and hazardous pipelines must be blind-sealed during normal operation. For socket-welded valves, threads can be pre-applied at the outlet to allow the use of threaded plugs; however, explosion-proof tools are required to remove these plugs, and it is well known that explosion-proof pliers are not very durable. Therefore, if socket-welded valves are used, circular-plugged versions must not be employed, as this will pose difficulties for maintenance personnel.