What is a butterfly valve?

Butterfly valve, also known as flap valve, is a simple control valve. Butterfly valve, which can be used to control the opening and closing of low-pressure pipeline medium, refers to a valve whose closing part (disc or butterfly plate) is a disc and rotates around the valve shaft to realize opening and closing.

Butterfly valve is a kind of valve which uses the disc-shaped opening and closing piece to rotate back and forth about 90 degrees to open, close or adjust the medium flow. Butterfly valve is not only simple in structure, small in size, light in weight, low in material consumption, small in installation size, small in driving torque, simple and fast in operation, but also has good flow regulation function and sealing characteristics. It is one of the fastest growing valve varieties in recent ten years. Butterfly valves are widely used. The variety and quantity of its use are still expanding, and it is developing towards the direction of high temperature, high pressure, large caliber, high sealing, long service life, excellent adjustment characteristics and multi-purpose of one valve. Its reliability and other performance indicators have reached a high level.

structure

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

trait

1. Butterfly valve has the characteristics of simple structure, small volume, light weight, low material consumption, small installation size, fast switching, 90 reciprocating rotation and small driving torque. Used to cut off, connect and adjust the medium in the pipeline, with good fluid control characteristics and sealing performance.

2. The butterfly valve can transport mud, and the liquid accumulated at the nozzle is the least. Good sealing can be achieved at low pressure. Good regulation performance.

3. The butterfly plate is streamlined, and the fluid resistance loss is small, which can be described as an energy-saving product.

4. The valve stem is a through rod structure, which has good comprehensive mechanical properties, corrosion resistance and scratch resistance after quenching and tempering. When the butterfly valve is opened and closed, the valve stem only rotates without lifting, so the packing of the valve stem is not easy to be damaged and the seal is reliable. It is fixed with a conical pin of the butterfly plate, and the protruding end is designed to prevent the valve stem from falling out when the joint between the valve stem and the butterfly plate is accidentally broken.

5. Connection methods include flange connection, clamping connection, butt welding connection and lug clamping connection.

The driving forms include manual, worm gear transmission, electric, pneumatic, hydraulic, electro-hydraulic linkage and other actuators, which can realize remote control and automatic operation.