Classification of fluorine-lined butterfly valves and connection methods

Classification of fluorine-lined butterfly valves and connection methods Introduction of classification of fluorine-lined butterfly valves 1. Classification of fluorine-lined butterfly valves by performance (1) Soft sealing butterfly valves. 1) The sealing pair is composed of non-metallic soft material to non-metallic soft material. 2) The sealing pair is composed of metal hard material and non-metal soft material. (2) Metal hard sealing butterfly valve. The sealing pair is composed of metal hard material to metal hard material. 2. Fluorine-lined butterfly valves are classified by structure (1) Center-sealed butterfly valves (2) Single-eccentric-sealed coal valves (3) Double-eccentric-sealed butterfly valves (4) Triple-eccentric-sealed stomping valves 3. Fluorine-lined butterfly valves are classified by sealing form (1) Forced sealing butterfly valve 1) Elastic sealing 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) External torque sealing butterfly valve. The sealing specific pressure is generated by the torque applied to the valve shaft (2) Pressurized sealing butterfly valve. The sealing specific pressure is generated by the charging of the elastic sealing element on the valve seat or valve plate (3) Automatic sealing butterfly valve. The sealing specific pressure is automatically generated by the medium pressure. The classification of the connection method of the fluorine-lined butterfly valve Precautions for butterfly valve: 1. Since the multi-layer soft-stacked sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a positive scouring on its sealing surface, and the sealing performance will be directly affected after the belt is scoured. 2. Restricted by structural conditions, this structure is not suitable for valves with a diameter below DN200, because the overall structure of the valve plate is too thick and the flow resistance is large. Product application of fluorine-lined butterfly valve: D371F46 wafer type fluorine-lined butterfly valve is suitable for various concentrations of aqua regia, sulfuric acid, hydrochloric acid, hydrofluoric acid and various organic acids, strong acids, strong oxidants at -50℃～150℃, FEP also It is suitable for use in pipelines with various concentrations of strong alkali organic solvents and other corrosive gases and liquid media. The characteristics of fluorine-lined butterfly valve: In the reverse flow state, the sealing between the valve plate and the valve seat depends on the torque of the driving device to press the valve plate to the valve seat. With the increase of the reverse medium pressure, when the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the deformation stored by the spring of the adjusting ring after being loaded can compensate the tight pressure between the valve plate and the valve seat sealing surface play an automatic compensation role. Therefore, the utility model does not install the soft and hard multi-layer sealing ring on the valve plate as in the prior art, but is directly installed on the valve body, and adding an adjusting ring between the pressure plate and the valve seat is an ideal two-way hard sealing method . It will replace gate valve and ball valve.
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