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Various classifications ventilation butterfly have?

Author： Published：2013-12-23

Ventilation valve, of course, maybe you know maybe you do not know , it has several categories , according to the working pressure , temperature decile. Yes, you should know that if I need to use the ventilation valve . Then look at the following classification of it, I hope for your help:
1 , according to the working pressure ventilation valve classification
( 1 ) vacuum valve . Standard atmospheric pressure is lower than the heap working calendar butterfly .
( 2 ) low-pressure valve . Nominal pressure PN <1.6MPa butterfly .
( 3 ) the pressure valve . Nominal pressure PN is 2.5 - 6.4MPa butterfly .
( 4 ) high-pressure butterfly valve . , PN is 10.0 - 80.0MPa butterfly .
( 5 ) high pressure valve . Nominal pressure PN> 100MPa butterfly .
2 , ventilation valve classified by structure
( 1 ) center sealing butterfly valve
( 2 ) single eccentric valve seal coal
( 3 ) double eccentric butterfly valve seal
( 4 ) triple eccentric valve seal stamp
3 , ventilation valve sealing surface material classification according to
( 1 ) soft sealing butterfly valve
a. sealing materials from non-metallic soft soft non-metallic material .
b. sealing materials by a rigid metal soft nonmetallic materials .
( 2 ) metal seal butterfly valve. Sealing materials from metal to metal hard rigid material.
4 , ventilation valve by Operating Temperature Classification
( 1 ) high temperature butterfly valves . t> 450 ℃ of butterfly
( 2 ) the temperature butterfly valve . 120 ℃ <T
( 3 ) at room temperature butterfly valves . Butterfly a 40 ℃ <T <120 ℃ for
( 4 ) cryogenic butterfly valves . A 100 ℃ <T
( 5 ) cryogenic butterfly valves . t < 100 ℃ of a valve
5 , ventilation valve seal form by Category
( 1 ) mandatory sealing butterfly valve .
a. elastic sealing butterfly valve. Sealing pressure when the valve is closed by the valve plate extrusion resilient seat , seat or valve plate production.
b. applied torque seal butterfly valve. Sealing pressure generated by the applied torque on the valve shaft.
( 2 ) pressurized sealing butterfly valve . Sealing pressure seal or valve seat by a bomb pieces of board member filling pressure generated .
( 3 ) self-sealing valve . Sealing pressure generated automatically by media pressure .
6, the air valve is connected by way of classification
( 1 ) Wafer Butterfly
( 2 ) Flange butterfly
( 3 ) lug butterfly valve
( 4 ) Welded Butterfly