Super Duplex Stainless Steel grade comprises both the austenitic and ferritic structures and hence has high strength along with pitting, crevice and chloride corrosion resistance. Speciality Valve is a prominent Super Duplex Gate Valve Manufacturer in India, manufacturing gate valves for demanding offshore, marine, desalination, oil and gas and process applications.
Super Duplex Gate Valve Material Grades
F53: UNS S32750 super duplex stainless steel
F55: UNS S32760 super duplex stainless steel
UNS S32750: Commonly associated with 2507 super duplex construction
UNS S32760: Super duplex grade with high resistance to chloride-bearing environments
F61: Applicable super duplex material where specified
Cast and forged material specifications should be matched to the selected valve construction and project requirements.
Super Duplex Gate Valve Configuration
A gate valve is primarily intended for isolation rather than continuous throttling. The gate moves away from the flow passage when opened, providing a relatively unobstructed path through the valve.
Full-bore or reduced-bore configurations
Rising stem arrangement
Flanged, butt-weld or socket-weld ends
Handwheel operation
Electric or pneumatic actuation
Renewable or integral seating according to construction
Solid, flexible or split-wedge arrangements where applicable
Gate geometry and seat design should be selected according to pressure, temperature, flow medium and shut-off requirements.
Technical Specifications
Valve Type: Super Duplex Gate Valve
Body Materials: Super Duplex Stainless Steel and compatible alloys
Nominal Size: DN15 to DN500
Nominal Pressure: PN1.0 to 25 MPa
Pressure Class: Class 150 to Class 2500
End Connections: Flanged, socket-weld and butt-weld
Operation: Handwheel, electric actuated or pneumatic actuated
Trim: Super Duplex, duplex, stainless steel or compatible alloy
Packing: Graphite, PTFE or service-specific material
Seat: Metal or application-specific seating
Final size, pressure-temperature capability and end configuration depend on the selected design.
Super Duplex Valve Materials
Body: Super duplex stainless steel or compatible pressure-boundary alloy
Bonnet: Super duplex, duplex or specified corrosion-resistant alloy
Gate: Super duplex stainless steel or compatible alloy
Stem: Stainless steel, super duplex or service-specific alloy
Trim: SS304, SS316, 13% chromium steel, duplex, super duplex or nickel alloy
Packing: Flexible graphite or PTFE, according to service
Fasteners: Corrosion-compatible grade selected for the valve assembly
The complete wetted construction should be reviewed rather than relying on body material alone.
Corrosion-Resistance Advantages
High resistance to pitting by chlorides
Better resistance to crevice corrosion than conventional stainless steels
Resistance to chloride stress corrosion cracking
High mechanical strength
Suitable for demanding seawater environments
Reduced material thickness may be possible where strength permits
Useful for aggressive offshore and process services
Super duplex should not be treated as universally corrosion-proof. Chloride concentration, temperature, velocity, oxygen content and process chemistry remain important.
Pressure and Connection Arrangements
The valve can be configured with flanged, socket-weld or butt-weld ends according to piping requirements. Flanged construction is suitable where equipment removal is required, while welded connections can be used for permanent piping systems.
For automated applications, actuator selection should consider valve size, differential pressure, stem thrust and required operating time.
Industrial Applications
Offshore Platforms: Seawater, injection-water and process isolation.
Desalination Plants: High-chloride water and brine services.
Marine Systems: Seawater handling and utility piping.
Oil & Gas: Hydrocarbon and water-injection systems.
Chemical Processing: Compatible corrosive process fluids.
Water Treatment: Chloride-bearing and high-salinity applications.
Power Generation: Selected cooling-water and utility systems.
Speciality Valve manufactures super duplex gate valves with material and construction options selected for demanding corrosion and pressure conditions. For a project-specific requirement, get in touch with Speciality Valve, the leading Super Duplex Gate Valve Manufacturer in India with the complete process data.
Visit us: https://www.specialityvalve.com/product/super-duplex-gate-valve/