Butterfly valve simple structure, small size, light weight, only by a few parts, simple operation, and the valve has good fluid control characteristics.

When the butterfly valve is fully open, 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 seal types: bomb seal and metal seal. Flexible seal valve, seal ring can be inlaid on the body or attached to the butterfly plate around. The valve with metal seal is generally longer than the valve with elastic seal, but it is difficult to achieve complete seal.

Metal seal can adapt to higher working temperature, elastic seal has temperature limitation. If the butterfly valve is required to be used as a flow control, the main thing is to choose the correct size and type of valve. The structure principle of butterfly valve is especially suitable for the production of large diameter valves. Butterfly valve is not only widely used in petroleum, gas, chemical, water treatment and other general industry, but also used in the cooling water system of thermal power station. Commonly used butterfly valves are clamp butterfly valves and flanged butterfly valves.

The clamp butterfly valve is connected between two pipe flanges with a double-headed bolt, flanged butterfly valve is a valve with a flange, with a bolt on both ends of the valve flange connected to the pipe flange. Valve strength performance refers to the ability of the valve to withstand medium pressure. Valves are mechanical products that bear internal pressure, so they must have sufficient strength and stiffness to ensure long-term use without rupture or deformation.