Duplex Ball Valve

Duplex ball valves and super duplex ball valves are extremely corrosion resistant, particularly resistant to not only chloride stress corrosion but also chloride pitting corrosion.

Corrosion Resistance
Ball valve made of duplex stainless steel are extremely corrosion-resistant. They have high resistance to intergranular corrosion. Even in chloride and sulfide environments, duplex stainless steel ball valve exhibits very high resistance to stress corrosion cracking. The super-duplex ball valves are even more resistant to corrosion.

Duplex Steel and Super Duplex Ball Valve Material:
● Duplex 2205(A890 4A, A182 F51,22Cr-5Ni-Mo-N, DIN 1.4462)
● Super Duplex 2507 (A890 5A, A182 F53,25Cr-7Ni-Mo-N,DIN 1.4410)
● Super Duplex (A890 6A, A182 F55,25Cr-7Ni-Mo-N,DIN 1.4501)
● Super Duplex (A182 F60, UNS S32205)

Duplex and Super Duplex Ball Valve Material 

Duplex 2205 A182 F51 S31803 A890 4A (CD3MN) 22Cr-5Ni-Mo-N 1.4462
Supper Duplex 2507 A182 F53 S32750 A890 5A (CE3MN) 25Cr-7Ni-Mo-N 1.4410
Supper Duplex A182 F55 S32760 A890 6A(CD3MWCuN) 25Cr-7Ni-Mo-N 1.4501
Supper Duplex A182 F60 S32205      

Duplex Steel Ball Valve Drawing

duplex steel ball valve drawing

Material Specifications

No. Part Name A890 4A /F51 A890 5A /F53 A890 6A/F316
1 Nut ASTM A194 8M ASTM A194 8M ASTM A194 8M
2 Bolt ASTM A193 B8M ASTM A193 B8M ASTM A193 B8M
3 Bonnet ASTM A890 4A  ASTM A890 5A ASTM A890 6A
4 Gasket SS316+Graphite SS316+Graphite SS316+Graphite
6 Ball A182 F51 ASTM A182 F53 ASTM A182 F60
7 Body ASTM A890 4A  ASTM A890 5A ASTM A351 CF8M
8 Spring SS 316 SS 316 SS 316
9 Stem A182 F51 A182 F53 ASTM A182 F60
10 Thrust Washer PTFE PTFE PTFE
11 Packing Graphite Graphite Graphite
12 Packing Gland ASTM A890 4A  ASTM A890 5A  ASTM A890 6A
13 Bolt ASTM A193 B8M ASTM A193 B8M ASTM A193 B8M
14 Nut ASTM A194 8M ASTM A194 8M ASTM A194 8M
15 Hand Stop Stainless Steel Stainless Steel Carbon Steel
16 Lock Cast Iron Cast Iron Cast Iron
17 Lever Carbon Steel Carbon Steel Carbon Steel
18 Gasket Duplex Steel Duplex Steel Duplex Steel
19 Pin Stainless Steel Stainless Steel Stainless Steel

Application of duplex ball valves
● Desalination:
 - Reverse osmosis (RO)
 - Brackish water reverse osmosis (BWRO)
 - Seawater reverse osmosis (SWRO)
 - Geothermal water
● Offshore oil and gas industry
● Pulp and paper industry
● Chemical industry: 
 - Sulphuric acid
 - Nitric acid
 - Saliferous fluids, hydroxide

The microstructures of duplex steel consist of a mixture of austenite and ferrite phases. As a result, duplex stainless steels display properties characteristic of both austenitic and ferritic stainless steels. This combination of properties can mean some
compromise when compared with pure austenitic and pure ferritic grades.

Suitable Temperature
The high chromium content of Duplex stainless steel, which protects against corrosion, causes embrittlement at temperatures over about 300°C. At low temperatures, duplex stainless steels have better ductility than ferritic and martensitic grades. Duplex grades can readily be used down to at least -50 °C.

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Valve type (ball, gate, globe, check etc.), valve size, pressure class, valve material, and end connection (flanged, butt welding etc.)