Butterfly Valve

A butterfly valve is a disk mounted on a rotating shaft, when is fully closed, the disk completely blocks the line and when is fully opened, the disk is parallel to the gas or liquid flowing. The valve disk is still in the flowing line when is fully open, there will always be a pressure drop across a butterfly valve; if the pressure is significant, it may be difficult to open the valve. Some applications require a bypass valve to bring the pressure difference down before large butterfly valves can operate.

One of the advantages for butterfly valves is that they are relatively inexpensive to build and maintain. They are the most common valve for large volume water systems such as municipal water works. They can be used for dirty liquid applications such as sewage or controlling river water.

Features of Butterfly Valve
Nominal Diameter: DN40-1000mm
Nominal pressure:PN1.0/1.6Mpa
Suitable fluids: Fresh water, sewage, sea water, air, vapor, food, medicine, oils, alkalis, salt and others.
End flange: ANSI B 16.1, EN 1092, AS 2129
Face to face: ANSI B 16.10, EN558-1 Ser. 20
Top flange: ISO 5211
Normal pressure: DN40-DN600 PN1.0/1.6MPa (150/200PSI) DN700-DN1200 PN1.0MPa (150PSI)
Stem: NR/Hypalon/EPDM/Neoprene/NBR/Wear-Resistant EPDM/Viton/Silicon/Heat-Resistant EPDM/White NBR/White EPDM/EPDM (NSF)/PTFE

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