Butterfly valve is a kind of valve that opens, closes and regulates fluid passage by reciprocating about 90 degrees of disc-type opening and closing parts.
It is simple in structure, small in volume, light in weight and low in consumables. It is not used in large caliber valves.
(2) Quick opening and closing, low flow resistance;
(3) It can be used in medium with suspended solid particles. According to the strength of sealing surface, it can also be used in powder and granular media. It can be used for two-way opening and closing of ventilation and dust removal pipelines, and is widely used in gas pipelines and waterways of metallurgical, light industry, electric power and petrochemical systems.
(1) The range of flow regulation is not large, when the opening reaches 30%, the flow will be more than 95%.
Because of the restriction of butterfly valve structure and sealing material, it is not suitable for high temperature and high pressure pipeline system. The general working temperature is below 300 C and PN40.
(3) Sealing performance is worse than ball valves and globe valves, so it is used in places where sealing requirements are not very high.