News

Installation method of butterfly plate of electric flange butterfly valve

Update:29-07-2020
Summary:

The main features of flanged butterfly valves are: 1. S […]

The main features of flanged butterfly valves are:

1. Small and light, easy to disassemble and repair, and can be installed in any position.

2. The structure is simple and compact, the operating torque is small, and the 90° turn to open quickly.

3. The flow characteristics tend to be straight, and the regulation performance is good.

4. The connection between the butterfly plate and the valve stem adopts a pinless structure, which overcomes possible internal leakage points.

5. The outer circle of the butterfly plate adopts a spherical shape, which improves the sealing performance and prolongs the service life of the valve. It still maintains zero leakage after opening and closing more than 50,000 times under pressure.

6. The seal can be replaced, and the seal is reliable to achieve two-way sealing.

7. The butterfly plate can be sprayed with a coating layer, such as nylon or PTFE, according to user requirements.

8. The valve can be designed as flange connection and wafer connection.

9. The driving mode can be manual, electric or pneumatic.

 

Electric flange butterfly valve is suitable for water supply and drainage, sewage, food, heating, gas, ship, hydropower, metallurgy, energy system, textile and other industries with temperature ≤120℃ or ≤150℃ and nominal pressure ≤1.6MPa. It is especially suitable for two-way sealing. And the valve body is easy to rust occasions, used as flow adjustment and interception medium.

Valves with metal seals generally have a longer life than valves with elastic seals, but it is difficult to achieve a complete seal. Metal seals can adapt to higher operating temperatures, while elastic seals have the defect of being limited by temperature.

The electric flange butterfly valve is usually composed of a quarter-stroke electric actuator (0~90° partial rotation) and an electric flange butterfly valve through a mechanical connection, after installation and debugging.

The butterfly plate of the electric flange butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the electric flange 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 opened.

The electric flange butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be opened and closed quickly by rotating 90°, and the operation is simple. At the same time, the valve has good fluid control characteristics. When the flange butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics. The butterfly valve has two sealing types: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be embedded in the valve body or attached to the periphery of the butterfly plate.

Valves with metal seals generally have a longer life than valves with elastic seals, but it is difficult to achieve a complete seal. Metal seals can adapt to higher operating temperatures, while elastic seals have the defect of being limited by temperature.

If the butterfly valve is required to be used as a flow control, the main thing is to correctly select the size and type of the valve. The structure principle of the electric flange butterfly valve is especially suitable for making large diameter valves. China Guowei Valve Manufacturing Co., Ltd. butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also used in cooling water systems of thermal power stations.

Commonly used electric flange butterfly valves include wafer butterfly valves and flange butterfly valves. Wafer type butterfly valve uses double-head bolts to connect the valve between two pipeline flanges. Flanged butterfly valve has flanges on the valve, and bolts are used to connect the flanges on both ends of the valve to the pipeline flanges.

When in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics. Electric flange butterfly valve has two sealing types: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be embedded in the valve body or attached to the periphery of the butterfly plate.

Valves with metal seals generally have a longer life than valves with elastic seals, but it is difficult to achieve a complete seal. Metal seals can adapt to higher operating temperatures, while elastic seals have the defect of being limited by temperature.

https://www.plasticpipevalve.com/