Ventilation butterfly valve 

 Product Overview 

 I plant the production of welded steel plate manufacturing ventilation valve has a short structure size, light weight, convenient installation. The valve driving torque is small, open and close a flexible, easy to operate. Valve oil seal ring on the set, no visible gap between the sealing, leak rate is small. Butterfly valve plate and the expansion of the gap between large, can effectively prevent heating or cooling caused by stuck. The valve can be equipped with a variety of drives, such as manual devices, worm gear, pneumatic devices, electric devices. Ventilation butterfly valve is widely used in metallurgy, petrochemical, power, building materials, mining and other industrial pipelines, gas control or gas for media regulation. 
 Uses and Features 

 Round Venetian-style butterfly valve with electric actuator package is widely used in electrical construction materials, metallurgy, mining, electricity production process, automatic or manual control to adjust the flow of the pipeline in the medium used. Butterfly valve using louvres multi-axis structure, the liquid evenly, even hoisting force, motion sensitive, and reliable performance. 

 Standard 

 Design standards: GB/T12238-1989 JB/T8692-1998 
 Flange size: GB/T9115.1-2000 
 Structure Length: GB/T12221-1989 
 Pressure test: GB/T13927-1992; JB/T9092-1999 

 Main technical parameters 
 Nominal diameter DN (mm) 50 ~ 2000 
 Nominal pressure PN (MPa) 0.05 0.25 0.6 
 Test pressure strength test 0.075 0.375 0.9 
 Seal leakage test ≤ 1% 
 Medium gas, dust and gas, the flue gas. 
 Drive in the form manually, Worm gear, gas transmission, electricity transmission.