Welded Check Valve

Welded check valves are mainly opened or closed automatically by the flow and force of the medium itself to prevent the medium from flowing back. It is widely used in many industries such as petroleum, chemical, electric power, metallurgy, pharmaceutical, food, etc., especially in pipeline systems with high pressure, high temperature and corrosive media, and its superior performance and reliable sealing have been widely recognized and applied.

 

welded check valve

 

Applications
Petrochemical industry: high-temperature oil pipelines, reactor outlet backflow prevention;
Electric power energy: boiler steam system, high-temperature and high-pressure cooling water circulation pipeline;
Nuclear industry: leakage control of radioactive medium pipelines.

Selection points
Pressure and temperature matching:
For conventional high pressure, select PN40~160 carbon steel valve body, and for ultra-high temperature (＞425℃), chromium-molybdenum steel or WC6/WC9 alloy material is required;
Medium characteristics:
For particle-containing fluids, a swing structure is preferred to avoid valve disc jamming;
Corrosive media (such as acid, urea) need to be lined with PTFE or a stainless steel valve body;
Welding process requirements:
Carbon steel valves use arc welding, and stainless steel requires argon arc welding to avoid intergranular corrosion.

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