Center Line-type Butterfly Valve  is suitable for water supplying and draining,gas pipe as adjust flux and cut off medium in foodstuff,pharmacy,chemical industry,petroleum,electric power,light textile,paper making etc with temperature≤120°C,nominal pressure≤1.6Mpa,the main characteristic such as:1.Novel and reasonable design,special structure,light, Easy instllation and mintenance.It can be mounted wherever needed.2.Tiny operative moment,quick 90 degrees on-off operation. 3.Miniminzed operating torque,energy saving. 4.Flow curve tending to straight line.Excellent regulation performance. 5.Long servie life.Standing the test of tens of thousands opening/closing operation.6.Bubbles-tight sealing with no leakage under the pressure test.7.Wide selection of materials, applicable for various medeium.