Duplex and Super Duplex

Piston valve Duplex

DN : 1"
Class : 150 Lbs
Grade :

Duplex and Super Duplex steels are austenitic-ferritic whose main characteristic is the resistance to intergranular corrosion and pitting.
Their mechanical properties are generally superior to those of conventional stainless steels.
Temperature is a limiting factor in their use (300°C). The Austenitic-ferritic nature requires special attention for welded construction.

Grade:318LN, A182 F51, A182 F55, A479 F51, A479 F55, UNS S31803, UNS S32205, UNS S32750, UNS S32760, X2CrNiMoN22-5-3, X2CrNiMoCuWN25.7.4, 1.4501, 1.4462, URANUS 45N®, URANUS 52N®

Guichon Valves manufactures valves from the following Duplex and Super Duplex grades:

Piston valve, Globe valve, Gate valve, Slide valve, Ball and plug valve, Tank bottom valve, Control valve, Injection valve, Sampling valve, Piloted safety valve, Check valve & Sight glasses & Strainers, Multiways valve.


  • Construction methods: Fabricated (Welded), Cast


  • Service conditions: High pressure, High temperature, Low temperature, Corrosion, High viscosity, Vacuum, Reliability
  • Type of fluids: Liquids, Liquids with solid particles – Slurry, Gas, High viscosity fluids
  • Application: Fine chemicals, Plastics and polymers, General chemicals, Petrochemicals, Nuclear and Naval / Submarine, Cryogenic service