What are the problems and answers that arise when using fluorine lined butterfly valves?

The butterfly plate of the fluorine lined butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, with a rotation angle between 0 and 90 degrees. When it rotates to 90 degrees, the valve is fully open. Users of fluorine lined butterfly valves have provided feedback that they may encounter the following problems during use, and the corresponding causes and solutions are attached at the back:

1、 Due to the multi-layer soft and hard stacked sealing ring fixed on the valve plate, when the valve plate is normally open, the medium forms a positive flushing on its sealing surface, and the soft sealing belt in the metal plate 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 a diameter below DN200, as the overall structure of the valve plate is too thick and the flow resistance is high.

3、 Due to the principle of rubber lined butterfly valves, the sealing between the sealing surface of the valve plate and the valve seat relies on the torque of the transmission device to press the valve plate against the valve seat. When in a positive flow state, the higher the medium pressure of the fluorine lined valve exhaust valve, the tighter the sealing compression. When the medium in the flow channel flows back, the sealing begins to leak when the unit positive pressure between the valve plate and valve seat is less than the medium pressure.

4、 A 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 conical structure, and temperature and corrosion resistant alloy materials are deposited on the conical surface of the valve plate; The structure of assembling the spring fixed between the adjusting ring pressure plate and the adjusting bolt on the pressure plate together. This structure 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 that exists in the bi-directional exchange medium transportation process of the valve. The sealing ring is composed of multiple layers of stainless steel sheets on both sides of a soft T-shape, which has the dual advantages of metal hard sealing and soft sealing. It 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 under positive medium pressure, the better the sealing effect. When in a countercurrent state, the sealing 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 by the spring of the regulating 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, this utility model does not install soft and hard multi-layer sealing rings on the valve plate, but is directly installed on the valve body. Adding an adjustment ring between the pressure plate and the valve seat is an ideal bidirectional hard sealing method.