Duplex steel ball valve using a fixed ball form, the medium acts on the sealing side of the force than the floating ball greatly reduced, opening and closing torque is reduced.
Specifications
|
Size Range |
Body Material |
|
2"-48" DN50-DN1000 |
Casted: 4A, 5A Forged: 2205/F51, 2207/F53 |
|
Pressure Rating |
Wedge Material |
|
Class150-Class2500 PN16-PN200 |
Casted: 4A, 5A Forged: 2205/F51, 2207/F53 |
|
End Connection |
Seat Material |
|
Flange (FF, RF, RJ), Butt Welding |
Casted: 4A, 5A Forged: 2205/F51, 2207/F53 |
|
Structure Style |
Stem Material |
|
Full Port, OS&Y, Bolted Bonnet / Pressure Seal Bonnet Solid Wedge |
Casted: 4A, 5A Forged: 2205, 2207 |
|
Actuator Options |
Design Standard |
|
Handwheel, Bevel Gear, Pneumatic, Electric |
API600, API602, API603, GB/T 12234 |
|
Temperature Range |
Face to Face Standard |
|
-196℃~650℃ |
ASME B16.10, GB/T 12221, GB/T 15188.1 |
|
Connection Standard |
Test Standard |
|
Flange Drilling: ASME B16.5, ASME B16.47, GB/T 9113, JB/T 79 Butt Weld: ASME B16.25 |
API 598, JB/T 9092, GB/T 13927 |
- Characteristics of Duplex Steel Materials
The excellent performance of duplex stainless steel valves is determined by the properties of its materials and the structural characteristics of the valve itself:
The so-called "duplex stainless steel" means that in its solid solution structure, the ferrite phase and the austenite phase account for approximately half each, and generally the small amount of phase is not less than 30%.
Due to the presence of ferrite and austenite in its structure, duplex stainless steel has the higher strength and chloride stress corrosion resistance of ferrite stainless steel and the excellent toughness and welding performance of austenitic stainless steel. Advantages, its main performance characteristics are as follows:
1. Molybdenum-containing duplex stainless steel has good chloride stress corrosion resistance under low stress.
2. Molybdenum-containing duplex stainless steel has good pitting corrosion resistance. When they have the same pitting resistance equivalent value (PRE=Cr%+3.3×Mo%+16×N%), the critical pitting potential of duplex stainless steel and austenitic stainless steel are similar. The pitting corrosion resistance of duplex stainless steel and austenitic stainless steel is equivalent to ANSI 316L. The pitting and crevice corrosion resistance of high-chromium duplex stainless steel containing 25% Cr, especially nitrogen, exceeds ANSI 316L.
3. It has good resistance to corrosion fatigue and wear and corrosion.
4. Good comprehensive mechanical properties. It has high strength and fatigue strength, and its yield strength is twice that of 18-8 austenitic stainless steel. The elongation in the solid solution state reaches 25%, and the toughness value Ak (V-shaped notch) is above 100J.
5. Good weldability and low tendency of hot cracking. Generally, no preheating is required before welding, and no heat treatment is required after welding. It can be welded with dissimilar types such as 18-8 austenitic stainless steel or carbon steel.
6. The hot processing temperature range of duplex stainless steel containing low chromium (18% Cr) is wider than that of 18-8 austenitic stainless steel, and the resistance is smaller.
7. The work hardening effect is greater than that of 18-8 type austenitic stainless steel during cold working. When the tube and plate undergo deformation in the early stages, greater stress must be applied to deform.
8. Compared with austenitic stainless steel, it has a large thermal conductivity and a small linear expansion coefficient.
9. It has various brittleness tendencies of high-chromium ferritic stainless steel and is not suitable for use in working conditions above 300°C.
- Gate Valves Duplex Steel
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