This DN150 (6") Class 150 swing check valve is designed to API 603 and BS 1868. The body is cast from CK3MCuN super duplex stainless steel, and the disc and trim are CK3MCuN with Stellite 6 hardfacing. End connections are RF flanged to ASME B16.5. The valve operates automatically to prevent flow reversal. The swing disc provides reliable sealing, and the super duplex material offers excellent resistance to corrosion, pitting, and stress corrosion cracking, particularly in seawater and chloride-containing environments. It is suitable for industrial pipeline systems that require backflow prevention under moderate pressure and highly corrosive conditions.

This DN80 (3") Class 1500 swing check valve has a pressure seal cover (PSC). It meets API 6D and BS 1868. The body is cast steel A216 WCB. The trim is 13% Cr+HF stainless steel. End connections are butt-welding per ASME B16.25. The PSC design gives reliable sealing at high pressure. Sealing gets tighter as pressure goes up. The valve works automatically to stop flow reversal. The swing disc gives reliable sealing. The stainless trim resists wear and corrosion well. It is used in high-pressure industrial pipelines that need strong backflow prevention.