PRODUCTS > Pneumatic butterfly valve > Pneumatic flange type multi layer metal hard sealing butterfly valve

Pneumatic flange type multi layer metal hard sealing butterfly valve

Nominal diameter: DN50 ~ 2000mm
Nominal pressure: 1.6MPa
Suitable temperature: ≦425℃
Applicable medium: water, oil or non corrosive medium, nitric acid medium, acetic acid medium
Body material: WCB, CF8/304, CF3M/316L
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Product introduction
      Pneumatic flange type multi layer metal hard sealing butterfly valve adopts three eccentric multi layer metal hard sealing structure, without mechanical wear, can achieve zero leakage, and has excellent two-way sealing function.

Application range
     Flange type pneumatic multi-level metal seal butterfly valve for the best device industry.methaslurgy.electric power, food, medicine, drainage, gas pipeline to transport different medium for regulating flow, cut off or connected to the fluid. The use of different materials, manual electric pneumatic butterfly valve, can be separately applied to water, sewage, sea water, air, steam, gas, combustible gas, corrosive medium, oil, food and other media, the highest working temperature of 600 DEG C. Is widely used in metallurgy, electric power, petroleum, chemical industry, water supply and drainage and municipal construction and other industrial pipelines, adjust the flux and set off fluid.

Structure characteristics
      Knot structure: the stem axis and the butterfly plate sealing surface offset between a size of A, and with the body channel axis offset a size of B, the valve seat rotation axis and valve body channel axis forming an eccentric angle alpha, so form three eccentric. The butterfly valve from 0 DEG to 90 DEG is opened, the disc sealing surface of the valve seat sealing surface will be out immediately in the opening moment, in the 90 and 0 degrees off, only in the closing moments of the butterfly plate conical sealing surface will contact and compress the valve seat conical seal. Therefore, there is no friction between the valve seat and the sealing surface of the butterfly plate, which removes the possibility of wear and leakage.

Torque seal
      Pneumatic flange type multi-level metal hard seal butterfly valve structure, so that when the butterfly valve closed, its sealing pairs, two sealing surface seal between the pressure from the stem to the stem driven by the torque generated. Not only eliminates the seal caused by conventional elastic seat elastic material aging, cold flow, elastic failure and other factors than the pressure decrease and disappear, but also by the external driving torque change, realize the sealing pressure can be adjusted, so that the three eccentric butterfly valve sealing performance is improved, the service life of the butterfly valve is greatly improved.

Hard and soft laminated metal sealing structure

The sealing surface of the butterfly plate seal with soft stacked stainless steel plate and flexible graphite plate, which has the dual advantages of ametal sealandsealthe, both in low and high temperature conditions, both with excellent sealing performance.
Two way seal: because the sealing cover cone angle is smaller than the friction angle of the sealing material, when the butterfly plate is closed to the sealing position, the self-locking can be realized immediately, and the reverse pressure shock can be taken.
Fire protection structure: all metal structure itself has fire safety characteristics.
Valve sealing surface: the use of surfacing carbide or stainless steel, making the sealing surface strength, hardness and wear resistance, can be continuously open and shut more than 60000 times without damage.
Sealing ring: the sealing ring is clamped by the pressure plate on the butterfly plate. It is easy to install, adjust and replace.
The upper part and the lower part of the valve stem are provided with shaft sleeves to prevent abrasion and adhesion, and the service life is improved.
The three-dimensional eccentric hard seal butterfly valve is flexible, labor-saving, convenient and reliable. The connecting ways include flange, butt clamp, butt welding and lug pair. Not only can cut off the medium, but also can adjust the medium flow freely.

Standard specification
Design and manufacture standards: GB/T 12238-2008
Structural length standard: GB/T 12221-2005
Connecting flange standard: GB/T 9113
Pressure temperature rating: GB/T 12224-2005
Test standard: GB/T 13927-2008

Parts, materials and working conditions

Working pressure(MPa)
Applicable temperature(℃)
Applicable medium
Water, oil, or non corrosive media
Nitric acid medium
Acetate medium
Material Science
Body valve, disc
The stem
Valve face
Butterfly plate seal face
304+Flexible graphite
Flexible graphite