The opening and closing part of vacuum butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to open and close or adjust the valve called butterfly valve. The vacuum butterfly valve is generally less than 900 when it is fully opened or fully closed. The butterfly valve and butterfly rod are not self-locking. In order to locate the butterfly plate, a worm gear reducer should be installed on the valve rod. The 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 operation performance of the valve.
Industrial special vacuum butterfly valve features high temperature resistance, high pressure range, large valve nominal diameter, valve body made of carbon steel, sealing ring of valve plate adopts metal ring instead of rubber ring. Large high temperature butterfly valve is made of steel plate by welding, which is mainly used for the flue gas duct and gas pipeline of high temperature medium.
vacuum butterfly valve advantages:
1. The opening and closing is convenient, quick, labor-saving, low fluid resistance, and can be operated frequently.
2. Simple structure, small volume and light weight.
3. It can transport mud with little liquid accumulated at the pipe mouth.
4. Under low pressure, good sealing can be achieved.
5. Good regulation performance.
vacuum butterfly valve disadvantages :
1. The range of working pressure and temperature is small.
2. Poor sealing.
The vacuum butterfly valve can be divided into bias plate butterfly valve, vertical plate butterfly valve, inclined plate butterfly valve and lever butterfly valve according to its structure. According to the sealing form, it can be divided into two types: relatively sealed butterfly valve and hard sealed butterfly valve. Rubber ring seal is generally used for soft seal type and metal ring seal is generally used for hard seal type.
According to the connection type, it can be divided into flange connection butterfly valve and wafer connection butterfly valve; according to the transmission mode, it can be divided into manual butterfly valve, gear transmission butterfly valve, pneumatic butterfly valve, hydraulic butterfly valve and electric butterfly valve.
The installation and maintenance of vacuum butterfly valve should pay attention to the following items:
1. During installation, the disc shall be stopped at the closed position.
2. The opening position shall be determined according to the rotation angle of butterfly plate.
3. For butterfly valve with bypass valve, the bypass valve shall be opened before opening.
4. The installation shall be carried out according to the installation instructions of the manufacturer. The heavy vacuum butterfly valve shall be provided with a solid foundation.