What are the advantages and disadvantages of butterfly valve and the key points of installation and maintenance?

Butterfly valve refers to the closing part (valve disc or butterfly plate) as a disc, around the valve shaft rotation to reach the opening and closing of a valve, in the pipe mainly cut off and throttle for use. Butterfly valve opening and closing part is a disc-shaped butterfly plate, in the valve body around its own axis rotation, so as to achieve the purpose of opening and closing or adjustment.

What are the advantages and disadvantages of butterfly valve and the key points of installation and maintenance?

Butterfly valve can be divided into offset plate, vertical plate, inclined plate and lever type. According to the sealing form can be divided into two sealing and hard sealing. Soft seal butterfly valve type is generally rubber ring seal, hard seal type is usually metal ring seal. It can be divided into flange connection and clip connection; manual, gear transmission, pneumatic, hydraulic and electric.

Advantages of butterfly valve

1, open and close convenient and fast, labor-saving, small fluid resistance, can be often operated.

2, simple structure, small volume, light weight.

3, can transport mud, the least liquid at the pipeline mouth.

4, under low pressure, can achieve good sealing.

5. Good adjustment performance.

Disadvantages of butterfly valves

1. Use pressure and working temperature range are small.

2. Poor sealing ability.

Installation and maintenance of the butterfly valve

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

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

3, the butterfly valve with a bypass valve, should first open the bypass valve before opening.

4. It should be installed according to the installation instructions of the manufacturer. The heavy butterfly valve should be set up with a solid foundation.

5. The butterfly plate of the butterfly valve is installed in the diameter direction of the pipe. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation Angle is between 0 and 90. When the rotation reaches 90, the valve is fully open.

6, if the butterfly valve is required to use as a flow control, the main thing is to correctly choose the size and type of the valve. The structural principle of butterfly valve is especially suitable for making large diameter valves. Butterfly valve is not only widely used in oil, gas, chemical industry, water treatment and other general industries, but also used in the cooling water system of thermal power station.

7, the commonly used butterfly valve has the Wafer type butterfly valve and flange type butterfly valve two kinds. The butterfly valve is to connect the valve between two pipe flanges, flange butterfly valve is with a flange on the valve, with the flange on the two ends of the valve flange on the pipe flange.