Pneumatic butterfly valve installation solution
Published: September 21, 2019 Author: 【191566.com】
Pneumatic butterfly valve is composed of pneumatic actuator and butterfly valve. The pneumatic butterfly valve uses a circular butterfly plate that rotates with the valve to open and close. The pneumatic valve to achieve the opening action is mainly used as a shut-off valve. Increasing use on medium-caliber pipes.
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, the rotation angle is between 0 ¡ã -90 ¡ã, and when it is rotated to 90 ¡ã, the valve is fully open. The 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 ¡ã, and the operation is simple. At the same time, the valve has good fluid control characteristics. When the pneumatic 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 good flow control characteristics.
The butterfly valve has two types of sealing: spring and metal. Elastically sealed 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 disadvantage of being temperature limited.
If butterfly valves are required for flow control, the main thing is to choose the correct valve size and type. The structural principle of the butterfly valve is particularly suitable for making large-caliber valves. Butterfly valves are widely used not only in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems in thermal power stations.
Commonly used butterfly valves are wafer type butterfly valves and flange type butterfly valves. Wafer type butterfly valve uses double-headed bolts to connect the valve between two pipeline flanges. Flange type butterfly valves have flanges on the valve, and bolts are used to connect the two ends of the valve to the pipeline flange.