Fire Protection 4 Inch Swing Check Valve Flanged Industrial Non Return Valve

The product quality is strictly manufactured in accordance with international and domestic standards such as ANSI, DIN and GB. It undergoes multiple inspections from raw materials to finished products to ensure long-term stable operation. The main body is made of ductile iron, stainless steel or cast steel (customizable on demand), which has high tensile strength, corrosion resistance and wear resistance, and is suitable for different medium working conditions; the valve disc is made of high-quality sealing materials, with excellent sealing performance, no leakage and no jamming, and the sealing surface is precision-processed with a service life of more than 8000 hours; the valve shaft is made of high-strength alloy material, which has undergone heat treatment process, anti-fatigue and not easy to deform, ensuring flexible opening and closing of the valve disc and quick response; the overall structure has passed water pressure and air pressure strength tests, with a pressure rating of up to PN10-PN40 (high-pressure version can be customized), complying with industrial pipeline safe operation standards, and can adapt to the working environment of -20℃ to 120℃, standing up to harsh working conditions.