Duplex SS Flanged Butterfly Valve

Duplex SS Flanged Butterfly Valve

ZFV duplex SS 2205/4A , 2507/5A butterfly valve. Butterfly valve shown in photo is PN16, DN80, material duplex 2204, flaned end. Duplex stainless steel is a kind of material that there is ferrite phase and austenite meet each half in its solid solution structure, generally the amount of less...

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ZFV duplex SS 2205/4A , 2507/5A butterfly valve. Duplex stainless steel is a kind of material that there is ferrite phase and austenite meet each half in its solid solution structure, generally the amount of less content also need Reaching 30%. In the case of low C, Cr content of 18% to 28%, Ni content of 3% to 10%. Some steel also contains Mo, Cu, Nb, Ti, N and other alloying elements.

* Size : DN80

* Pressure : PN16 

* Connection Type : Flanged 

* Operation : Lever Operation

* Torque : 90N.m

* Face to face: 114mm

* Seal Structure : SS316 + graphite

* Application : Water , Oil , Gas, Acid 

* Painting Color : No painting

* Suitable Temperature : -29°C ~ 325°C

* Suitale Pressure : PN≤1.6Mpa

* Function : Regulation

* Material : Body: Duplex SS 2205, 

                  Disc: Duplex SS 2205, 

                  Seal: laminated S31254+graphite.

                  Stem: A182-F51

* Design and manufacture BS EN 593 

* Face to face dimension BS EN 558

* End flanges dimension BS EN 1092-1

* Test & inspection as BS EN 12266-1

* Origin : CHINA


The steel has the characteristics both of austenitic and ferritic stainless steel, compared with the ferrite, plasticity, higher toughness, no room temperature brittleness, resistance to intergranular corrosion and welding performance are significantly improved, while also maintaining iron qualified stainless steel 475 ℃ brittleness and high thermal conductivity, with superplasticity and so on.

Compared with the austenitic stainless steel, high strength and resistance to intergranular corrosion and resistance to chloride stress corrosion performance of duplex stainless steel has improved significantly. Duplex stainless steel has excellent resistance of pitting corrosion , but also a section of nickel stainless steel.

Because of its anti-chloride corrosion performance, commonly be used in seawater media.

There are 2205,2507 two kinds of material in market. 

-2205 corresponds to the casting material grade ASTM A890 4A, forging material grade ASTM A182 F51.

-2507corresponds to the casting material grade ASTM A890 5A, forging material grade ASTM A182 F53

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