Fluorine-lined butterfly valve performance classification

Fluorine-lined butterfly valve performance classification The disc of the fluorine-lined butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it rotates to 90°, the valve is fully open. The characteristics of the new high-life stainless steel butterfly valve and the problems in the use of the butterfly valve At present, the fluorine-lined butterfly valve and the rubber-lined butterfly valve, as a component used to realize the on-off and flow control of the pipeline system, have been used in petroleum, chemical, metallurgy, hydropower It has been widely used in many fields. In the known butterfly valve technology, the sealing form mostly adopts the sealing structure, and the sealing material is rubber, polytetrafluoroethylene, etc. Due to the limitation of structural characteristics, it is not suitable for industries such as high temperature resistance, high pressure, corrosion resistance and wear resistance. A relatively advanced butterfly valve is a three-eccentric metal hard-sealed butterfly valve. The valve body and the valve seat are connected components, and the sealing surface layer of the valve seat is surfacing with temperature-resistant and corrosion-resistant alloy materials. The multi-layer soft stacked sealing ring is fixed on the valve plate. Compared with the traditional butterfly valve, this kind of butterfly valve has high temperature resistance, easy operation, no friction when opening and closing. The advantages of excellent sealing performance and extended service life. This type of valve should generally be installed horizontally in the pipeline. A. The fluorine-lined butterfly valve still has the following problems during use: 1. Since the multi-layer soft and hard laminated sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a positive scour on its sealing surface, and the metal After the soft sealing tape in the interlayer is washed, it directly affects the sealing performance. 2. Restricted by structural conditions, the 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 the rubber-lined butterfly valve, 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 to the valve seat. In the positive flow state, the higher the medium pressure, the tighter the seal squeezes. When the medium in the flow channel flows back, the seal begins to leak when the unit positive pressure between the valve plate and the valve seat is less than the medium pressure as the medium pressure increases. Fourth, the high-performance fluorine-lined butterfly valve is characterized in that: the valve seat sealing ring is composed of multi-layer stainless steel sheets on both sides of the soft T-shaped sealing ring. The sealing surface of the valve plate and the valve seat is an inclined conical structure, and the temperature and corrosion resistant alloy materials are surfacing on the inclined conical surface of the valve plate; the spring fixed between the adjusting ring pressure plates and the adjusting bolts on the pressure plate are assembled together. This structure effectively compensates the tolerance zone between the shaft sleeve and the valve body and the elastic deformation of the valve stem under the medium pressure, and solves the sealing problem of the valve during the two-way exchange of medium conveying. The sealing ring is composed of multi-layer stainless steel sheets on both sides of the soft T-shaped, which has the dual advantages of metal hard sealing and soft sealing, and has zero leakage sealing performance under low temperature and high temperature conditions. The test proves that when the pool is in a positive flow state (the direction of medium flow is the same as the rotation direction of the butterfly plate), the pressure on the sealing surface is generated 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 conical surface of the valve plate and the sealing surface of the valve seat are, the better the sealing effect will be. In the reverse flow state, the seal between the valve plate and the valve seat is driven by the torque of the driving 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 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 the gate valve and the ball valve B. The performance of the fluorine-lined butterfly valve is classified into several categories. Sealed stomping valve 2. Classification according to the material of the sealing surface (1) Soft sealing butterfly valve. 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. 3. The fluorine-lined butterfly valve is classified according to the 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) The additional torque seals the 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. 4. Fluorine-lined butterfly valves are classified according to working pressure (1) Vacuum butterfly valves. Butterfly valve whose working pressure is lower than standard reactor atmospheric calendar. (2) Low pressure butterfly valve. Butterfly valve with nominal pressure PN < 1.6MPa. (3) Medium pressure butterfly valve. Butterfly valve with nominal pressure PN of 2.5--6.4MPa. (4) High pressure butterfly valve. The nominal pressure PN is 10.0--80.0MPa butterfly valve. (5) Ultra-high pressure butterfly valve. Butterfly valve with nominal pressure PN>100MPa. 5. The fluorine-lined butterfly valve is classified according to the working temperature (1) High temperature butterfly valve. Butterfly valve with t>450C (2) Medium temperature butterfly valve. 120Cvalve application is a good way to humanize Lianke Valve and engage your target customers.
Grab great deals to buy at Lianke Valve Co.,Ltd.. Visit us today on Lianke Valve.
Through our distribution and marketing competencies, Lianke Valve Co.,Ltd. provides creative, customized, solutions for our customers. As a result, we achieve superior profit growth as the valve application company of choice.