With the application of chemical resistant synthetic rubber in butterfly valves, the performance of butterfly valves has been improved. Because synthetic rubber has the characteristics of corrosion resistance, erosion resistance, stable size, good resilience, easy forming and low cost, and can choose synthetic rubber with different properties according to different use requirements to meet the operating conditions of butterfly valves, it is widely used to manufacture lining and elastic seat of butterfly valves.

Attention should be paid to the details of waterproof casing during installation
With the rapid development of China's economy, every city is building high-rise or super high-rise buildings. In order to improve the space of these buildings, designers will set pipes, pools and pump houses in the public rooms. In this case, pipes will pass through the floor and various walls
This urges the designer to do a good job in the installation of the stainless steel waterproof bushing and the clearance between the bushing and the pipeline. If the treatment is not good enough, it will damage the appearance of the building and form the leakage of the pipeline. The waterproof bushing can effectively prevent disclosure and is widely used in building water supply and drainage engineering
Check the quality of flexible waterproof shell, pipe fittings and rubber sealing ring, clear the dirt on the socket and socket, and install the rubber ring in the socket slot. The insertion length of the pipe end should avoid the shrinkage caused by temperature difference, and its value should be determined according to the blocked temperature difference during construction. The construction can be stopped according to the value in Table I29
After the insertion depth, it is required to draw the insertion depth mark at the end of the pipe. Use the feeler to check the apron position along the pipe circumference and along the interface gap
Insert some lubricant on the apron and plug. The lubricant must be non-toxic and odorless, and the cattle must not be fed with bacteria such as soap or detergent. It is strictly prohibited to use butter, flexible waterproof shell, rubber ring, or damage (oil and other oils as lubricants)
Insert the socket into the socket, align the shaft, and use special tension tools, such as tightener, to evenly insert people into the socket. When it is difficult to insert, check whether the rubber ring can be in place