Butterfly Valves

Butterfly valves and ball valves both have similar operating principles. All that the butterfly is is a disc attached to a rod. When the valve opens, the disc is moved back to admit the flow. The valve closes when the rod turns the disc by a quarter turn to a point perpendicular to the flow direction. The butterfly valves are utilized for on-off or modulating services due to their lightweight, lower costs, compact installation footprint, availability in large sizes, and speedy operation. These valves are operated by handles, gears, or mechanical actuators. 

Advantages:

  • Small and swiftly opening and closing when activated, butterfly valves are tiny.
  • The disc is lighter than the ball valve, thus the valve needs less structural support for a similar diameter.
  • The accuracy of butterfly valves makes them particularly useful in industrial settings.
  • They are highly dependable and require very little maintenance.

Disadvantages:

  • Even when fully open, a piece of the disc is exposed to the flow.
  • The butterfly valve always causes a pressure switch across the valve, regardless of the setting.
  • The thicker liquids may prevent the disc from rotating.

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