PRODUCTS > Pneumatic butterfly valve > AW pneumatic flange hard sealing butterfly valve

AW pneumatic flange hard sealing butterfly valve

Nominal diameter: DN50 to 2000mm
Nominal pressure: 0.6~4.0MPa
Applicable temperature: carbon steel: -29℃~425℃, stainless steel -40℃~600℃
Applicable medium: air, water, steam, gas, oil, acid, alkali, salt, weak corrosive medium, etc.
Body material: cast iron, stainless steel, alloy steel, chromium molybdenum steel
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First: AW pneumatic flange seal butterfly valve overview

        Multi layer hard seal butterfly valve products, long life, energy-saving butterfly valve. The structure is designed with the principle of three dimensional centering. The valve seat adopts a hard, soft and sealed multi layer structure. It is exquisite in workmanship and advanced in technology. This product is composed of main body parts, such as valve body, butterfly plate, multi-level valve seat, valve stem and transmission mechanism. Therefore, it is widely used in metallurgy, power, petroleum, chemical, air, gas, flammable gas and water supply and drainage pipelines.

Two: AW pneumatic flange sealing butterfly valve features

       Because this product is used in valve design principle of three-dimensional space trajectory eccentric, the sealing surface of the sealing surface to achieve the ideal, no friction, no interference between each other, and the sealing material selection properly, so that the valve sealing performance, corrosion resistance, high temperature resistance and wear resistance has been a reliable guarantee. Its main features are as follows:
1, Small opening moment, flexible and convenient, labor-saving and energy saving.
2, Three-dimensional structure of the heart, so that the more closed butterfly plate tight, its sealing performance is reliable, to achieve no leakage.
3, High pressure resistance, corrosion resistance, wear resistance, long service life, etc.

Three: AW pneumatic flange, hard sealing butterfly valve, standard

Design standard: GB/T12238-1989; JB/T8527-1997
Flange size:GB/T9113.1-2000;GB/T9113.2-2000
Structure length: GB/T12221-1989
Pressure test: GB/T13927-1992; JB/T9092-1999

Four:  AW pneumatic flange hard sealing butterfly valve actuating mechanism

       Using the new GT series of pneumatic actuators, a double acting and single acting (spring), gear drive, safe and reliable; AW series of large diameter valves using pneumatic actuator fork transmission, reasonable structure, large output torque, a double acting and single acting.
1, Gear type double piston, the output torque is large, small size.
2, Cylinder selection of aluminum and gold materials, light weight, beautiful appearance.
3, Manual operation mechanism can be installed at top and bottom.
4, Rack type connection can adjust the opening angle and rated flow.
5, Actuators optional live signal, feedback instructions and various accessories to achieve automatic operation.
6, IS05211 standard connection for the installation of products to replace the convenience.
7, Adjustable ends of the screws can make the standard products at 0 degrees and 90 degrees, there is an adjustable range of + 4 degrees. Ensure the synchronization accuracy with the valve.

Five: AW pneumatic flange, rigid butterfly valve attachment options

The following attachments can be selected according to different controls and requirements:
Cut off type accessories: single electric controlled electromagnetic valve, double electronically controlled solenoid valve, limit switch back detector.
Adjustable accessories: Electrical positioner, pneumatic positioner, electrical converter.
Air source treatment accessories: air filter pressure reducing valve, gas source treatment triple parts.
Manual mechanism: HVSD hand operated mechanism


Nominal diameterDN(mm)50~200050~500
Nominal pressurePN(MPa)
Test pressureStrength test0.
Sealing test0.661.11.762.754.4
Airtight seal test0.
Leakage rate<0.1×DNmm3/s(Conform to GB/T13927-92 standard)
Applicable temperatureCarbon steel:-29℃~425℃ Stainless steel-40℃~600℃
Applicable mediumAir, water, steam, gas, oil, acid, alkali and salt have weak corrosive medium
Drive formWorm and worm gear drive, pneumatic drive, electric drive

Seven: AW pneumatic flange, hard sealing butterfly valve main parts of the material

Part nameMaterial Science
Valve bodyCast iron, stainless steel, alloy steel, chromium molybdenum steel
DiscCast iron, stainless steel, alloy steel, chromium molybdenum steel
Seal ringStainless steel and high temperature resistant asbestos board are combined into multiple layers
The stem2Cr13、1Cr13Stainless steel, chrome molybdenum steel
BearingAustenitic stainless steel, 304 Nitrided
FillerFlexible graphite

Eight: AW pneumatic flange seal butterfly valve, three eccentric features and principles

1, Off the center of the pipeline
2, Off the center of the sealing surface
3, Tilting cone
      When the valve is opened, the butterfly plate and valve seat in the closing moment contact, the use of butterfly plate eccentric 1, eccentric 2 quickly out of the seat, reducing the sealing pairs of wear, friction torque is small, open flexible. Eccentric cone 3, so that the valve opens or closes, the butterfly plate through the valve seat hole to achieve contact sealing. In addition, the rotating radius of the conical butterfly plate is larger than the rotary radius of the contact position of the sealing pair, so the butterfly plate will appear more closed when the valve is closed, and the self-locking can be realized to prevent the butterfly plate from being crossed.