1.smoke duct butterfly valve  plate is bigger than valve port, seal line is a whole round seal, valve seat is steel casting, in the sealing end is overlaid by special wear-resisting alloy materials that is rigidity seeal. By finish turning,grind and then to make sure the sealing face leakproofness.

2.smoke duct butterfly valve  body adopt bilayer structure that contain liner and shell, the joint of liner and shell use the stainless steel heat distortion absorption cover which can absorb the thermal discrepancy and then to make sure the valve leakproofness under cold or hot condition.

3.smoke duct butterfly valve Principle axis adpot our own special shaft seal unit, with that can make sure damper can turn moothly but no jam and leaking.

4.smoke duct butterfly valve ’s open and shut can be completed by manual,pneumatic or electric operation.

5.Through the space analytic geometry calculaation to make sure the valve deck that diameter is larger thant the valve can roll into and roll out the valve, by which complete overturn, slippage,locking etc. action.

6.Even under high temparature, the damper can ahieve frequent adjustment, tightly isolation, reliable sealing. In emergency and accident conditon, the whole damper open can be controlled within 30s.

1.Medium: cold and hot air.

2.Pipeline shape: Horizontal or vertical round or retangle pipe.

3.Design temparature: ≤400°C

4.Design pressure: ≤11kPa.

5.Driving mode: pneumatic, AC 220V/50Hz (magnetic valve), air sources is compress air 0.4MPa~0.8Mpa.

6.Leaking rate: 0%