Duplex Steel Check Valve
6 products found
A duplex steel check valve is an automatic non-return valve cast or forged from premium duplex stainless steel alloys (such as UNS S31803 or S32205) featuring a balanced, dual-phase ferritic-austenitic crystalline structure. This specific metallurgical composition delivers twice the mechanical yield strength of standard austenitic grades alongside elite resistance to chloride stress corrosion cracking, pitting, and crevice degradation. Operating automatically based on pipeline fluid kinetics, the internal swing disc or piston lift plug opens smoothly under forward flow and seals firmly against the seat ring when the fluid decelerates, preventing reverse flow and protecting upstream pump systems from water hammer. Offshore piping contractors and desalination plant operators can eliminate chloride-induced cracking and maximize backflow protection by importing certified duplex steel check valves directly from specialized manufacturers in China via our advanced B2B commercial platform.
Wenzhou Unique Valve Co., Ltd.
Non-Return Valve
Wenzhou Unique Valve Co., Ltd.
API 6D Check Valve, Soft Seated, 1/2-48 Inch, 150-2500 LB
Wenzhou Unique Valve Co., Ltd.
Soft Seated Check Valve with RF End, DN15-DN1200, PN16-PN420
Wenzhou Unique Valve Co., Ltd.
API 6D Flanged Check Valve, ASTM A352 LCB, 18 Inch, 150 LB
Bosseal Valves (Suzhou) Co., Ltd.
ASTM A182 F51 Swing Check Valve, API 602, 2 Inch, 1500 LB
Model Number: 2S15JF51
Bosseal Valves (Suzhou) Co., Ltd.
Duplex Stainless Steel Non-Return Valve, 24 IN, CL 300
Model Number: 1842051
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