Introduction:
Characteristics of new long-life stainless steel butterfly valve and problems existing in its use. At present, telescopic butterfly valve, as an element to realize the on-off and flow control of pipeline system, has been applied in many fields such as petroleum, chemical industry, metallurgy, hydropower and so on. It has been widely used in this field. In the known butterfly valve technology, the sealing form mostly adopts sealing structure, and the sealing material is rubber, PTFE and so on. Due to the limitation of structural characteristics, it is not suitable for industries such as high temperature resistance, high pressure resistance, corrosion resistance and wear resistance. At present, the more advanced butterfly valve is the triple eccentric metal hard seal butterfly valve. The valve body and the valve seat are connected parts, and the sealing surface of the valve seat is covered with heat-resistant and corrosion-resistant alloy materials. Compared with the traditional butterfly valve, this butterfly valve has the advantages of high temperature resistance, easy operation, no friction when opening and closing, compensation sealing with the increase of torque of transmission mechanism when closing, and improved sealing performance and service life of the butterfly valve.
Precautions:
1. Before assembly, check that all parts of pneumatic butterfly valve are free of defects and models, that there are no sundries in the valve body, and that the solenoid valve and muffler are not blocked.
2. Close the valves and gas cylinders.
3. Knock the cylinder into the valve (the installation direction can be parallel or vertical to the valve body), and then see if the screw holes are aligned, there will be no big deviation. If there is any deviation, just turn the cylinder slightly and then tighten the screws.
4. After the installation, debug the pneumatic butterfly valve (under normal circumstances, the air supply pressure is 0.4~0.6MPa). When debugging, manually operate the solenoid valve (it will be effective only after the solenoid valve coil is cut off) and observe the opening and closing of the telescopic butterfly valve. If it is found that the valve is struggling at the beginning of the opening and closing process, and then it is normal, it is necessary to reduce the cylinder stroke (at the same time, slightly adjust the stroke adjustment screws at both ends of the cylinder, when adjusting, run the valve to the open position, then turn off the air source and adjust it again) until the valve is closed smoothly without leakage. It should also be noted that the adjustable muffler can adjust the opening and closing speed of the valve, but it should not be too small, otherwise the valve may not act.
5, hair should be kept dry before installation, shall not be stored in the open air.
6. Check the pipeline before installing the butterfly valve to ensure that there are no foreign bodies such as welding slag in the pipeline.
7. The manual opening and closing resistance of the telescopic butterfly valve body is moderate, and the torque of the butterfly valve matches the torque of the selected actuator.
8. The flange used to connect the telescopic butterfly valve has correct specifications, and the pipe clamp flange conforms to the butterfly valve flange standard. It is recommended to use special flanges for butterfly valves, and flat welding flanges are not allowed.
9. Ensure that the flange is welded correctly. After the butterfly valve is installed, the flange shall not be welded again to avoid scalding the rubber parts.
10, the installed pipe flange should be centered, and the butterfly valve should also be centered.
1 1. Install all flange bolts and tighten them by hand. Ensure that the butterfly valve and flange are aligned, and then carefully open and close the butterfly valve to ensure flexible opening and closing.
12. Open the valve completely and tighten the bolts diagonally with a wrench. Do not tighten the bolt too tightly without washer, so as to avoid serious deformation of the valve ring and excessive opening and closing torque.
Matters for use:
1. Because the multilayer soft and hard laminated sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium washes its sealing surface, and the soft sealing band in the metal sheet interlayer will directly affect the sealing performance after being washed.
Secondly, due to the structural conditions, this structure is not suitable for making valves with a diameter below DN200, because the overall structure of the valve plate is too thick and the flow resistance is large.
Thirdly, due to the principle of triple eccentric structure, the seal between the sealing surface of the valve plate and the valve seat depends on the torque of the transmission device to make the valve plate press on the valve seat. In the forward flow state, the higher the medium pressure, the tighter the seal extrusion. When the medium in the flow channel flows reversely, with the increase of medium pressure, when the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the seal begins to leak.
High performance soft sealing butterfly valve
It is characterized in that the sealing ring of the valve seat is composed of multiple layers of stainless steel sheets on both sides of the soft T-shaped sealing ring.
The sealing surface between the valve plate and the valve seat is of an inclined conical surface structure, and the inclined conical surface of the valve plate is surfacing with a temperature-resistant and corrosion-resistant alloy material; The spring fixed between the pressure plates of the adjusting ring is assembled with the adjusting bolts on the pressure plates. This structure effectively compensates the tolerance zone between the shaft sleeve and the valve body and the elastic deformation of the valve stem under medium pressure, and solves the sealing problem of the valve in the process of bidirectional exchange of medium transportation.
The sealing ring composed of soft T-shaped stainless steel sheets on both sides has the dual advantages of metal hard sealing and soft sealing, and has zero leakage sealing performance at low temperature and high temperature. The test shows that the pressure on the sealing surface is generated by the torque of the transmission device and the pressure of the medium acting on the valve plate when the pool is in a positive flow state (the flow direction of the medium is the same as the rotation direction of the butterfly plate). When the positive medium pressure increases, the tighter the compression between the inclined conical surface of the valve plate and the sealing surface of the valve seat, the better the sealing effect.
When in the 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. 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 in the adjusting ring spring after loading can compensate the tight pressure between the valve plate and the valve seat sealing surface, which plays an automatic compensation role.
Therefore, different from the prior art, the utility model does not install the soft and hard multilayer sealing ring on the valve plate, but directly installs it on the valve body, and adds an adjusting ring between the pressure plate and the valve seat, which is an ideal two-way hard sealing mode. It will replace gate valves and ball valves.
Yongjia Libai Valve Co., Ltd.? Bailey SD34 1X- 10 telescopic butterfly valve? Reference price: 150 yuan/piece.
Shandong Haidian valve co., ltd? Haidian D94 1W-2.5C telescopic butterfly valve? Reference price: 300 yuan/piece.
Wuxi meidie valve industry co., ltd? Wuxi Mei Butterfly Valve Industry M-D67 1X- 16Q Telescopic Butterfly Valve? Reference price: 1 15 yuan/piece.
Wenzhou Jiasheng Valve Co., Ltd.? Jiasheng valve SD34 1X/SD343H telescopic butterfly valve? Reference price: 260 yuan/piece.
Shanghai Zhenghu Valve Co., Ltd.? Shanghai Zhenghu valve S9343H- 10C/ 16C/ telescopic butterfly valve? Reference price: 150 yuan/piece.
Tianjin fifteen valve co., ltd? 15 SD34 1X, SD97 1X telescopic butterfly valve? Reference price: 50 yuan/unit.
Guangzhou shengfeibo valve co., ltd? Bohai SD34 1X/42X43X telescopic butterfly valve? Reference price: 368 yuan/piece
Wenzhou Bao Zhong Valve Manufacturing Co., Ltd.? Bao Zhong ds 941x/j-10c/16c telescopic butterfly valve? Reference price: 430 yuan/unit.
Yongjia huirui valve co., ltd? Hui Rui SD343W- 16P telescopic butterfly valve? Reference price: 180 yuan/piece.
Gongyi city Yueyang Pipeline Equipment Factory. Yueyang 50-2200 telescopic butterfly valve? Reference price: 90 yuan/Taiwan.
Dunbang Valve (Shanghai) Co., Ltd.? SD64 1X telescopic butterfly valve? Reference price: 450 yuan/Taiwan.
Flanders Control Equipment (Guangzhou) Co., Ltd.? Flanders D34 1X- 10? Telescopic butterfly valve? Reference price: 888 yuan/piece
Zhejiang Gaoyuan Valve Co., Ltd.? Far-high valve SD643H- 16C telescopic butterfly valve? Reference price: 180 yuan/piece.
Shanghai shangquan valve manufacturing co., ltd? Shangquan SD 341x-6/116 telescopic butterfly valve? Reference price: 380 yuan/unit.
Yongjia jihui valve co., ltd? Ji Hui valve SD343W- 10P telescopic butterfly valve? Reference price: 660 yuan/piece.
Conclusion: Bian Xiao's introduction of telescopic butterfly valve ends here. Do you have a deeper understanding of the price of telescopic butterfly valves? For more information, please pay attention to the Tuba Rabbit website. Wish you a happy life.
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