How to adjust the leakage of pneumatic three eccentric flange hard seal butterfly valve? 3. When selecting the filter pressure reducing valve, pay attention to the pressure range, flow medium, working temperature, drainage device (self draining, manual draining) and filter element precision of the filter pressure reducing valve.
4. When selecting limit switches, pay attention to whether the feedback mode (mechanical and inductive), the color of position indication and the corresponding explosion-proof grade meet the requirements.
4. Classification according to working pressure
(1) Vacuum butterfly valve. Butterfly valve with working pressure lower than standard atmospheric pressure.
(2) Low pressure butterfly valve. Butterfly valve with nominal pressure PN ≤ 1.6MPa.
(3) Medium pressure butterfly valve. Butterfly valve with nominal pressure PN 2.5 〜 6.4 MPa.
(4) High pressure butterfly valve. Butterfly valve with nominal pressure PN 10.0~80.OMPa.
(5) Ultra high pressure butterfly valve. Butterfly valve with nominal pressure PN<100MPa.
