Handle butterfly valve simple structure, small volume, light weight, only a few parts. Moreover, the valve can be opened and closed quickly by rotating only 90°, which is easy to operate. At the same time, the 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 better flow control characteristics. Handle butterfly valve has two types of seal seal and metal seal. Resilient sealing valve, sealing ring can be embedded in the body or attached to the disc around.

Valves with metal seals generally have longer service lives than those with elastic seals, but it is difficult to achieve complete sealing. The metal seal can adapt to higher working temperature, while the elastic seal has the limitation of temperature.