Product characteristics and performance of the hot

Product characteristics and service performance of butterfly valve

butterfly valve refers to a valve whose closing part (disc or disc) is a disc and rotates around the valve shaft to open and close. It is mainly used for cutting off and throttling on the pipeline. The opening and closing part of butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjustment. The butterfly valve is usually less than 90 from full open to full close. The butterfly valve and the butterfly rod have no self-locking ability of the existing building energy-saving glass. In order to position the butterfly plate, a worm gear reducer should be installed on the valve rod. Using worm gear reducer can not only make the butterfly plate have self-locking ability, stop the butterfly plate at any position, but also improve the operating performance of the valve

industrial butterfly valves are characterized by high temperature resistance, suitable for making good materials in China, high pressure range, large nominal diameter of the valve, carbon steel valve body, and metal ring instead of rubber ring for the sealing ring of the valve plate. Large high-temperature butterfly valves are made of welded steel plates and are mainly used for smoke and air ducts and gas pipelines of high-temperature media

the advantages of butterfly valve are as follows:

1. It is easy to open and close, labor-saving, low fluid resistance, and can be operated frequently

2. Simple structure, small volume and light weight

3. The mud can be transported, and the liquid accumulated at the pipe mouth is the least

4. Good sealing can be achieved under low pressure

5. Good regulation performance

butterfly valves have the following disadvantages:

1. The range of operating pressure and temperature is small

2, poor sealing

butterfly valves can be divided into offset plate, vertical plate, inclined plate and lever type according to their structural forms. According to the sealing form, it can be divided into relatively sealed type and hard sealed type. The soft seal type usually adopts rubber ring seal, and the hard seal type usually adopts metal ring seal

according to the connection type, it can be divided into flange connection and wafer connection; According to the transmission mode, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric

the installation and maintenance of butterfly valves should pay attention to the following matters:

1. During installation, the valve disc should stop at the closed position

2. The opening position should be determined according to the rotation angle of the butterfly plate

3. For butterfly valves with bypass valves, open the bypass valve before opening

4. The capacity of modified plastics should be expanded by about 60% according to the installation instructions of the manufacturer. The butterfly valve with large weight should be set with a solid foundation