(1) Vacuum butterfly valve: pressure is lower than the standard atmosphere of butterfly valve.
(2) Low pressure butterfly valve: Nominal pressure PN < 1.6 MPa butterfly valve.
(3) Medium pressure butterfly valve: nominal pressure PN 2.5-6.4 MPa butterfly valve.
(4) High pressure butterfly valve Nominal pressure PN to 10.0-80.0 MPa butterfly valves.
(5) Ultrahigh pressure butterfly valve Nominal pressure PN > 100 Mpa butterfly valve.
The butterfly valve butterfly plate is installed on the diameter of the pipe direction. Cylindrical channels in butterfly valve body, disc around the axis of rotation, rotation Angle for 0 ° ~ 90 °, rotate to 90 °, the valve is fully open. This valve shall generally be installed in the pipeline.
