What are the problems in the use of fluorine-lined butterfly valves? Let's take a look:
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1. Since the multi-layer soft and hard stacked sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium will form a positive erosion on its sealing surface. The soft sealing band in the metal sheet sandwich will directly affect the sealing performance after being washed.
2. Due to 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.
3. Due to the principle of rubber-lined butterfly valve, the sealing between the sealing surface of the valve plate and the valve seat is to press the valve plate against the valve seat by the torque of the transmission device. In the state of positive flow, the higher the medium pressure, the tighter the sealing extrusion. When the flow channel medium flows back, as the medium pressure increases, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the seal begins to leak.
Fourth, 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 the soft T-shaped sealing ring.
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The sealing ring is composed of a soft T-shaped multi-layer stainless steel sheet on both sides, which has the dual advantages of a metal hard seal and a soft seal, and has a sealing performance of zero leakage regardless of low temperature and high temperature. The test proves that in the positive flow state of the pool (the flow direction of the medium is the same as the rotation direction of the butterfly plate), the pressure of the sealing surface is produced by the torque of the transmission device and the action of the medium pressure on the valve plate. When the positive medium pressure increases, the tighter the oblique cone surface of the valve plate and the sealing surface of the valve seat are pressed, the better the sealing effect.''
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When in the reverse flow state, the seal between the valve plate and the valve seat depends on the torque of the drive device to press the valve plate against 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 energy stored by the spring of the adjusting ring after being loaded compensates for the tight pressure of the sealing surface of the valve plate and the valve seat Play the role of automatic compensation.''
Therefore, the utility model does not install soft and hard multi-layer sealing rings on the valve plate as in the prior art, but directly installs on the valve body. Adding an adjustment ring between the pressure plate and the valve seat is a very ideal two-way hard sealing method. . It can replace gate valves and ball valves.
Regarding the instructions for the use of fluorine-lined butterfly valves; the models of the valves are based on the type of fluid used, pressure, temperature range and other factors. Therefore, when selecting a valve, be sure to confirm the respective "Instructions for Use" and "Available Range" before using it. If it is used without following the regulations within the scope of the instructions for use of the valve, accidents may occur.
The performance classification of fluorine-lined butterfly valve is as follows: '
1. Classified by structure: (1) Central sealing butterfly valve (2) Single eccentric sealing coal valve (3) Double eccentric sealing butterfly valve (4) Triple eccentric sealing valve ''
2. Classified by sealing surface material: (1) Soft sealing butterfly valve. (2) The sealing pair is composed of non-metallic soft material to non-metallic soft material. (3) The sealing pair is composed of metallic hard materials and non-metallic soft materials. (4) Metal hard sealing butterfly valve. The sealing pair is composed of a metal hard material to a metal hard material.
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