In the 1930s, the United States invented the butterfly valve, which was introduced into Japan in the 1950s and was not commonly used in Japan until the 1960s. Promotion in China was after the 1970s. Small operating torque, small installation space and light weight. Take DN1000 as an example, the butterfly valve is about 2T, while the gate valve is about 3.5T, and the butterfly valve is easy to combine with various driving devices, and has good durability and reliability. Faulty butterfly valve in daily work and eliminate methods: 1, before installation, please confirm the product performance and medium flow arrow is consistent with the movement conditions, and the valve insert the plug cavity clean, not allowed in the ring and butterfly attached There are foreign bodies, not clean before the butterfly must not be closed, so as not to damage the ring. 2, the flange plate supporting the installation of special disc flange recommended, that is HGJ54-91 socket welded steel flange. 3, installed in the pipeline location, the best position for the legislation, but can not flip. 4, the need to regulate the use of traffic, a worm gearbox control. 5, open, close the number of disc valve, in about two months time, open the worm gear box cover, check the butter is normal, should maintain the right amount of butter. 6, check the connection parts require compression, that is, to ensure that the filler bees sex, but also to ensure flexible stem rotation. 7, metal seal butterfly valve products are not suitable for installation at the end of the pipeline, such as must be installed at the end of the pipeline, the need to take the export flange, to prevent the backlog seal, over. 8, the valve stem to install the use of regular inspection of the valve to check the effectiveness of the use, found that the failure to be ruled out in time. 9, the possible failure to eliminate the method as shown in the following table: Common faults and solutions of the butterfly valve Possible causes of failure Sealing surface leakage 1, butterfly plate, sealing surface with debris 2, butterfly plate, sealing surface closed position mismatch 3, the export side of the installation of flange bolts uneven force or not according to the requirements of Figure 1 4, the pressure test direction is not required to eliminate the method according to Figure 1, to eliminate impurities, cleaning the valve cavity 2, adjust the adjustment of the worm gear or electric actuator Screw to close the valve in the correct position 3, check the installation flange plane and the bolt pressing the country should be uniform compression 4, according to the direction of the tip seal pressure on both ends of the valve to eliminate leakage 1, both sides of the gasket failure 2, the pipe flange uneven or not compressed 3, the seal, the next seal gasket failure to eliminate 1, replace the gasket 2, the flange bolts (uniform force) 3, remove the valve Pressure ring, replace the seal, failure gasket butterfly valve can be divided according to the structure of the bias plate, vertical plate, inclined plate and lever. Sealing by the form can be divided into two types of soft seal and hard seal. Rubber seals are generally used rubber ring seal, hard seal is usually used metal ring seal. According to the connection type can be divided into flange connection and the clamp connection; According to the transmission can be divided into manual, gear transmission, pneumatic, hydraulic and electric several.
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