PTFE lined valve: What are the problems in the use of PTFE lined butterfly valves?

PTFE lined valve : Fluorine-lined Butterfly Valve What are the problems in use?
　　
1、 Due to the multi-layer soft and hard stacked sealing ring fixed on the valve plate, when the valve plate is in a normally open state, the medium forms a positive flushing on its sealing surface. The soft sealing tape in the metal sheet interlayer is directly affected by the flushing, which directly affects the sealing performance.
　　
2、 Due to structural limitations, this structure is not suitable for valves with diameters below DN200, as the overall structure of the valve plate is too thick and has high flow resistance.
　　
3、 Due to the principle of rubber lined butterfly valves, the sealing between the sealing surface of the valve plate and the valve seat is achieved by the torque of the transmission device, which presses the valve plate against the valve seat. When in a positive flow state, Clamp type fluorine lined butterfly valve Pipe clamp valves, fluorine lined valves, and exhaust valves have tighter sealing and compression as the medium pressure increases. When the medium in the flow channel flows backwards and the unit positive pressure between the valve plate and the valve seat is less than the medium pressure as the medium pressure increases, the seal begins to leak.
　　
4、 The high-performance fluorine lined butterfly valve is characterized in that the valve seat sealing ring is composed of multiple layers of stainless steel sheets on both sides of a soft T-shaped sealing ring.
　　
The sealing surface between the valve plate and the valve seat is a slanted cone structure, and a heat-resistant and corrosion-resistant alloy material is welded on the slanted cone surface of the valve plate; Fluorine lined DC globe valve The structure in which the spring fixed between the adjusting ring pressure plate and the adjusting bolt on the pressure plate are assembled together. This structure effectively compensates for the tolerance zone between the shaft sleeve and the valve body, as well as the elastic deformation of the valve stem under medium pressure, solving the sealing problem of the valve in the bi-directional exchange of medium transportation process.
　　
A sealing ring is composed of multiple layers of soft T-shaped stainless steel sheets on both sides, check valve It has the dual advantages of metal hard seal and soft seal, and has zero leakage sealing performance in both low and high temperature conditions. The experiment proves that when the pool is in a positive flow state (the direction of medium flow is the same as the direction of butterfly plate rotation), the pressure on the sealing surface is generated by the torque of the transmission device and the effect of medium pressure on the valve plate. The tighter the compression between the inclined conical surface of the valve plate and the sealing surface of the valve seat when the positive medium pressure increases, the better the sealing effect.
　　
When in reverse flow state, the seal between the valve plate and the valve seat is pressed against the valve seat by the torque of the driving device. As the reverse medium pressure increases, when the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the deformation energy stored in the spring of the adjusting ring of the colloid mill emulsifier filter after being loaded compensates for the tight pressure on the sealing surface between the valve plate and the valve seat, playing an automatic compensation role.
　　
Therefore, unlike existing technologies that install soft and hard multi-layer sealing rings on the valve plate, this utility model directly installs them on the valve body, and adding an adjusting ring between the pressure plate and the valve seat is an ideal bidirectional hard sealing method.

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