Double offset metal seated butterfly valve is stainless steel laminated graphite seat for zero leakage design.Double offset metal seated butterfly valve size range: NPS 2 to NPS 48,Class range: PN10/16/25/40/150LB/300LB. Double offset metal seated butterfly valve can be used in high-pressure systems such as ethanol or HVAC and metal seats are also provided to meet fire-testing requirements such as API 607.
Double offset metal seated butterfly valve specification
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TYPE: |
Double offset, metal seated |
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SIZE & CONNECTIONS: |
DN50 to DN2000 |
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MEDIUM: |
Air, Inert Gas, Oil, Seawater, Waste water, Water |
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MATERIALS: |
Carbon Steel / Stainless
Steel / Alu Bronze |
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PRESSURE RATING: |
PN10/16, Class 150/300 |
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TEMPERATURE: |
-40°C to 450°C |
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SEAT: |
Graphite+Stainless steel |
Double offset metal seated butterfly valve feature
1.The double offset metal seated butterfly valve has two offsets at the center that produce cam action at the time of the application process.Triple eccentric butterfly valve has three different offset valves. Two offsets are located at the center whereas the third is on the seat surface which creates the shape of the disk and seat form of the cone.
2.The double offset metal seated butterfly valve can be used for an application of up to 325°C and can be used in pressure as high as 50 bars. While a Triple eccentric butterfly valve can be used for a demanding & long-term application of up to 932°F (500°C) and the valve is designed to withstand a high pressure of up to 725 psi (50 bar).
3.Double offset metal seated butterfly valve seat is made up of soft material while in triple offset butterfly valve seat is made of hard metal.
4.One of the key distinctions between the two butterfly valves is their appearance. In the double offset butterfly valve, the two offsets of this type of valve allow easy opening and retain their strong sealing strength.
Double offset metal seated butterfly valve introduction
Double offset metal seated butterfly valve has a two-offset disk which can be used up to 1,480 psi [10 MPa]. Compared to the single-eccentric design, the double offset butterfly valve uses a stem which is present behind the disk. In the high-performance butterfly valve, the second offset stem is pushed back to one side from the middle of the disk. This offset geometry allows the disk to be rubbed over the seat with just 1° to 3° of 90° rotation.
The action of the double offset metal seated butterfly valve refers to the cone profile while sealing the valve. The configuration of the disc and shaft offsets produces the cam action of the disk in the seat, minimizing the torque required to operate the butterfly valve.
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