I. According to the connection method:
(1) Welded butterfly valve
Welded butterfly valve is a kind of non-closed butterfly valve, widely used in the production process of building materials, metallurgy, mining, electric power and other medium temperature ≤ 300 ℃ nominal pressure of 0.1Mpa pipeline, used to communicate, open and close or adjust the amount of medium.
(2) flange type butterfly valve
The flange type butterfly valve has a vertical plate structure, and the valve stem is a sealing ring of an integral metal hard-sealed valve. It is a composite structure of a flexible graphite plate and a stainless steel plate. The sealing ring of the soft seal valve is made of nitrile rubber, which is installed on the butterfly plate.
(3) Lug type butterfly valve
(4) Wafer type butterfly valve
The butterfly plate of the wafer butterfly valve is installed in the diameter direction of the pipe. The valve is fully open.
Wafer type butterfly valve has simple structure, small size and light weight. Butterfly valve has two types of sealing: elastic seal and metal seal. Elastically sealed valve. The seal can be embedded in the valve body or attached to the periphery of the butterfly plate.
2. According to the sealing method:
(1) When the sealing specific pressure is closed by the valve, the valve plate kneads the valve seat, and the elasticity of the valve seat or the valve plate occurs. Elastically sealed butterfly valve.
(2) The specific pressure of the seal is triggered by the torque applied to the valve shaft. Plus torque sealed butterfly valve.
(3) The specific pressure of the seal is triggered by the pressure of the sealing member of the spring seat on the valve seat or the valve plate. Pressure-sealed butterfly valve.
(4) The specific pressure of the seal is initiated by the medium pressure. Actively sealed butterfly valve.
3. By driving method
(2) Pneumatic butterfly valve
(3), hydraulic butterfly valve
(4) Manual butterfly valve
Four. Sealing material:
(1) Soft seal butterfly valve.
(2) Non-metal soft materials constitute non-metal soft materials.
(3) Metal hard materials constitute non-metal soft materials.
(4) Metal hard seal butterfly valve. The sealing pair is composed of metal hard data to metal hard data.
V. According to working pressure:
(1) Butterfly valve whose working pressure is lower than the standard atmospheric pressure. Vacuum butterfly valve.
(2) Butterfly valve with pressure PN <1.6MPa. Low pressure butterfly valve.
(3) Butterfly valve with pressure PN of 2.5--6.4MPa. Medium pressure butterfly valve.
(4) Butterfly valve with pressure PN of 10.0-80.0MPa. High pressure butterfly valve.
(5) Butterfly valve with pressure PN> 100MPa. Ultra high pressure butterfly valve.
6. According to working temperature:
(1) Butterfly valve with t> 450 ° C. high temperature.
(3 a 40C
(4) a 100
(5) Butterfly valve with t <100 ° C. Ultra-low temperature butterfly valve.
7. According to the structural method:
(2) Single partial pain
(3) Double Migraine
(4) Three Migraine Sealed Butterfly Valves
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