Working principle of pneumatic butterfly valve

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 activation action is mainly used as a shut-off valve. It can also be designed to have the function of adjustment or section valve and adjustment. At present, domestic production of butterfly valves The manufacturer has Fuer Valve Co., Ltd., whose products have certain price advantages and technical advantages in the industry. It is used more and more on low pressure large and medium caliber pipes.

The pneumatic butterfly valve uses a circular butterfly plate that rotates with the valve to open and close. The pneumatic valve to achieve the activation action is mainly used as a shut-off valve. It can also be designed to have the function of adjustment or section valve and adjustment. At present, the disc valve is at low pressure. Increasingly used on large and medium caliber pipes.

The main advantages of the disc valve are simple structure, small size, light weight, and low cost. This feature is particularly prominent in pneumatic disc valves. It is installed in a high-altitude underpass, and is easy to control and operate through a two-position five-way solenoid valve. It can also adjust the flow medium. The fluid resistance is small, the effective flow area is large when the large-diameter pneumatic disc valve is fully opened, and the opening and closing is quick and labor-saving. The disc can be opened and closed by rotating the disc by 90 degrees. Because the medium force of the disc plate on both sides of the shaft is nearly equal, The generated torque is in the opposite direction, so the opening and closing torque is small, and good sealing can be achieved under low pressure. The sealing materials of the disc valve include nitrile rubber, fluoro rubber, edible rubber, and PTFE lining, so the sealing performance is good. The valve is a soft and hard laminated metal sheet, which has the important advantages of metal hard sealing and elastic sealing, and has excellent sealing performance at low temperatures.

Butterfly valve structure working principle applicable environment analysis

The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. 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 it rotates to 90 °, the valve is fully opened.

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 only rotating 90 °, and the operation is simple. At the same time, the electric valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the 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 seal and metal seal. Elastically sealed valve, the seal ring can be embedded in the valve body or attached to the periphery of the butterfly plate.

Metal sealed valves generally have a longer life than elastically sealed valves, 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 especially 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 for thermal power stations.