Super duplex steel ball valve is a type of valve whose main components-including the valve body, ball, stem, and metal seats-are cast or forged from materials such as ASTM A995 Gr.5A (CE3MN), ASTM A995 Gr.6A (CD3MWCuN), A182 F53, A182 F55, or 2507. It exhibits high strength and excellent resistance to pitting and crevice corrosion in seawater and other chloride-containing environments.
The material used for the valve body has a Pitting Resistance Equivalent Number (PREN) > 40, with a chromium content of 25%, high molybdenum (>3.5%), and high nitrogen (0.22%–0.3%). Its microstructure consists of austenite and ferrite, theoretically each accounting for 50%, combining the advantages of both austenitic and ferritic stainless steels.
This type of steel is characterized by low carbon content, high chromium, molybdenum, and nitrogen, offering high strength, good overall performance, and superior resistance to pitting and crevice corrosion. As a result, this product is widely used in strongly oxidizing and reducing acidic environments and exhibits exceptional resistance to stress corrosion cracking in chloride-containing media. It is particularly suitable for use in corrosive conditions involving both erosion and abrasion.
Specification
Size Range And Pressure Class
Size from 2" to 48" (DN50-DN1200)
Pressure from 150LBS to 2500LBS (PN16-PN420)
Design Standards
Design / Manufacture as per the standards
API 6D; ASME B16.34; DIN 3357; EN 13709; GB/T12237; BS5351
Face to Face Length (Dimension) as per the standards
ASME B16.10; EN 558-1 Gr. 14 (DIN 3202-F4); DIN 3202-F5; DIN 3202-F7; BS5163
Flanged Dimension according to the standards
ASME B16.5; EN 1092-1; BS4504; DIN2501;
Flanged to ASME B16.5 (2" ~ 24") and ASME B16.47 Series A / B (26" and above) Clamp / Hub ends on request.
Testing according to the standards
API 598; API 6D; EN 12266-1; EN 1074-1; ISO5208
Construction Materials
UNS S31803 /S32205 (Duplex2205), A890/A995 GR.4A (J92205) /A351 CD3MN
UNS S32750 (Super Duplex2507), A890/A995 GR.5A / A351 CE8MN (CD4MCu)
UNS S32760, A890/A995 GR.6A (CD3MWCuN)
ASTM A182 F51, X2 CrNiMoN 22 5 3 / X2CrNiMoN22-5-3 (1.4462)
ASTM A182 F52, (1.4460)
ASTM A182 F53, X2CrNiMoCuN 25.6.3 (1.4410)
ASTM A182 F55, X2CrNiMoCuWN 25.7.4 (1.4501)
ASTM A182 F60, (1.4462)
Performance Advantages: Multi-Dimensional Technological Breakthroughs
Sealing Performance
Bidirectional Sealing: The ball and seat utilize elastic materials (e.g., PTFE) to accommodate bidirectional pressure, preventing media leakage.
Self-Reinforced Sealing: As media pressure increases, sealing force strengthens simultaneously, ensuring reliability under high-pressure conditions.
Operational Flexibility
90° Quick On/Off: A full open/close operation is achieved by rotating the ball, compatible with electric, pneumatic, or manual drives for integration into automated control systems.
Low-Torque Design: Minimal fluid resistance ensures smooth operation, reducing operator fatigue.
Durability & Maintainability
Simple Structure: Fewer components lower failure rates and extend maintenance intervals.
Anti-Jam Design: A smooth ball surface minimizes media buildup, preventing jamming caused by impurities.
Safety Features
Anti-Static Structure: A conductive pathway between the stem and ball dissipates frictional charges, preventing hazards from static electricity.
High-Temperature & High-Pressure Resistance: 2507 duplex steel withstands temperatures up to 300°C and pressure ratings up to PN64, making it suitable for extreme conditions.
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