Classified by work pressure
(1) Vacuum butterfly valve. Butterfly valves whose working pressure is lower than the atmospheric pressure of the standard reactor.
(2) Low-pressure butterfly valve. Butterfly valve with nominal pressure PN<1.6MPa.
(3) Medium pressure butterfly valve. A butterfly valve with a nominal pressure PN of 2.5-6. 4MPa.
(4) High pressure butterfly valve. A butterfly valve with a nominal pressure PN of 10.0-80.0MPa.
(5) Ultra-high pressure butterfly valve. Butterfly valve with nominal pressure PN>100MPa.
Classified by working temperature
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