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What are the classification criteria for pneumatic butterfly valves
Published: March 14, 2016 Author: 【191566.com】 Hits: Times

There are many classification standards for pneumatic butterfly valves, so how are they classified?

Classification by structure

(1) Central seal butterfly valve; (2) Single eccentric seal butterfly valve; (3) Double eccentric seal butterfly valve; (4) Triple eccentric seal butterfly valve

2. Classified by sealing surface material

(1) Soft-seal butterfly valve; 1) Sealing pair is made of non-metal soft material to non-metal soft material; 2) Sealing pair is made of metal hard material to non-metal soft material.

(2) Metal hard seal butterfly valve. The sealing pair is composed of a metal hard material to a metal hard material.

3. Classified by sealed form

(1) Forced sealing butterfly valve: 1) Elastically sealed butterfly valve. The sealing specific pressure is generated by the valve plate pressing the valve seat when the valve is closed, and the elasticity of the valve seat or valve plate; 2) The torque sealed butterfly valve. The specific pressure of the seal is generated by the torque applied to the valve shaft;

(2) Pressure-seal butterfly valve. The specific pressure of the seal is generated by the pressure of the elastic sealing element of the valve seat or valve plate;

(3) Automatically sealed butterfly valve. The specific pressure of the seal is automatically generated by the medium pressure.

4. Classified by working pressure

(1) Vacuum butterfly valve; (2) Low pressure butterfly valve; (3) Medium pressure butterfly valve; (4) High pressure butterfly valve; (5) Ultra high pressure butterfly valve.

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