Butterfly valve

          Butterfly valve, also known as flap valve, is a type of regulating valve with a simple structure that can be used for on/off control of low-pressure pipeline media. Butterfly valve refers to a valve whose closing element (valve disc or butterfly plate) is a disc that rotates around the valve axis to achieve opening and closing.

          Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media. It mainly plays a role in cutting off and throttling on pipelines. The butterfly valve opening and closing component is a disc-shaped butterfly plate that rotates around its own axis inside the valve body to achieve the purpose of opening, closing, or adjusting.

structure

Mainly composed of valve body, valve stem, butterfly plate, and sealing ring. The valve body is cylindrical in shape, with a short axial length and a built-in butterfly plate.

characteristic

1. Butterfly valves have the characteristics of simple structure, small volume, light weight, low material consumption, small installation size, fast opening and closing, 90 ° reciprocating rotation, and small driving torque. They are used to cut off, connect, and regulate the medium in pipelines, and have good fluid control characteristics and closing sealing performance.

2. Butterfly valves can transport mud and accumulate the least amount of liquid at the pipeline outlet. Under low pressure, good sealing can be achieved. Good regulation performance.

3. The streamlined design of the butterfly plate reduces fluid resistance loss, making it an energy-saving product.

4. The valve stem is a through stem structure that has undergone quenching and tempering treatment, and has good comprehensive mechanical properties, corrosion resistance, and abrasion resistance. When the butterfly valve is opened and closed, the valve stem only rotates and does not move up or down. The packing of the valve stem is not easily damaged and the seal is reliable. Fixed with the butterfly plate cone pin, the extended end is designed to prevent the valve stem from bursting out in case of accidental breakage at the connection between the valve stem and the butterfly plate.

5. The connection methods include flange connection, clamp connection, butt welding connection, and lug clamp connection.

The driving forms include manual, worm gear transmission, electric, pneumatic, hydraulic, electro-hydraulic linkage and other actuating mechanisms, which can achieve remote control and automated operation.

advantage

1. Easy and quick opening and closing, labor-saving, low fluid resistance, and can be operated frequently.

2. Simple structure, small external dimensions, short structural length, small volume, light weight, suitable for large-diameter valves.

3. It can transport mud with minimal liquid accumulation at the pipeline outlet.

4. Under low pressure, good sealing can be achieved.

5. Good regulation performance.

6. When fully open, the effective flow area of the valve seat channel is larger and the fluid resistance is smaller.

7. The opening and closing torque is relatively small, and due to the fact that the butterfly plates on both sides of the shaft are subjected to the same medium effect, the direction of torque generated is opposite, making opening and closing more effortless.

8. The sealing surface material is generally made of rubber or plastic, so it has good low-pressure sealing performance.

9. Easy to install.

10. Flexible and labor-saving operation, available in manual, electric, pneumatic, and hydraulic modes.