1, hard seal butterfly valve is the use of soft and hardlayer of the sheet metal layered composition, throughhigh precision machining process, embedded inagreement with the valve seat disc, and has dual advantages of metal seal and the seal of flexibility, both in low and high temperature conditions, both withexcellent sealing properties.

2, using three-dimensional asymmetric structure valve seat and disc almost no friction, has a sealing function is closed tightly.

3, unique structure, flexible operation, labor saving,convenient, free from media pressure, high, low impact,reliable sealing performance, long service life.

4, hard seal butterfly valve is provided with a seal ofturbine regulating device, the long-term use if the sealing performance, adjustable disc sealing ring to the seatnear the can restore the original sealing performance,greatly improving the service life.