They are widely used in on/off and control flow of medium a variety
pipeline, such as oil field, chemistry industry, power plant and long
distance pipeline under working temperature 600oC.

Features:
1) Design standard: GB12237, JB/T 7745
2) Face to face: GB12221, GB/12237, JB/T7745
3) Flange ends: GB/T9113, GB/T13402, JB/779
4) Test and inspection: JB/T9092, GB/T13927
5) Nominal pressure: PN1.6 ~ 25.0MPa
6) Nominal diameter: DN15 ~ 1500mm
7) Type of connection: flange, butt-welding, thread
8) Driving: hand-operating, electric-driving, hydraulic driving,
pneumatic-operating, gear-operating