Advantages and disadvantages of butterfly valve and structure diagram

Advantages and disadvantages of butterfly valve and structure diagram

The butterfly valve opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve opening and closing or adjustment. When the butterfly valve is fully open to fully closed, it is usually less than 900. The butterfly valve and the butterfly rod itself have no self-locking force. For the positioning of the butterfly plate, a worm gear reducer must be installed on the valve rod. The use of worm gear reducer can not only make the disc plate have self-locking ability, stop the disc plate at any position, but also improve the operation performance of the valve.

The characteristics of the industrial special butterfly valve can withstand high temperature, and the applicable pressure range is also high. The nominal diameter of the valve is large. The valve body is made of carbon steel. The sealing ring of the valve plate uses a metal ring instead of a rubber ring. Large high-temperature butterfly valves are manufactured by welding steel plates, and are mainly used for flue gas ducts and gas pipelines of high-temperature media.

(1) Advantages of butterfly valve:

1. Opening and closing is convenient and quick, labor saving, low fluid resistance, and can be operated frequently.

2. Simple structure, small size and light weight.

3. Mud can be transported, and there is little liquid accumulated in the pipe mouth.

4. Under low pressure, a good seal can be achieved.

5. Good adjustment performance.

(2) Disadvantages of butterfly valve:

1. The operating pressure and working temperature range are small.

2. Poor sealing.

(3) Installation and maintenance of butterfly valve:

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

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

3. Butterfly valves with bypass valves should be opened before opening.

4. The installation should be carried out according to the manufacturer's installation instructions. The heavy-weight butterfly valve should be installed with a solid foundation.