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Which principles are working behind the butterfly valve


The butterfly is a type of valve and it is used for the control the flow. It will use the metal disc. Here get the information about which principles are working behind the butterfly valve? – PowerPoint PPT presentation

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Title: Which principles are working behind the butterfly valve

The Working Principle Behind A Butterfly Valve
  • A valve that can be used for regulating or
    isolating the flow is called a butterfly valve.
  • This valve is used to open or close the circular
    butterfly plate, which rotates with a pungent and
    is used as a cut-off valve.
  • A butterfly valves manufacturers suggest that the
    valve can be designed to have the function of
    paragraph valve and adjust the disc.

Operation principle
  • The more and more used valve in the low pressure
    caliber pipes is cast iron butterfly valve.
  • The closing mechanism proceeds further in the
    form of a disk.
  • The operation of a butterfly valve is quite
    similar to that of a ball valve, which allows a
    quick shut off.
  • The reason behind butterfly valves being commonly
    favored in the industry is that they are lower in
    cost as compared to the other valve designs as
    well as lighter in weight.
  • Therefore, it requires less support. In the
    center of the pipe, the disc is positioned,
    through which the rod is connected to an actuator
  • The actuator, as it starts rotating, turns the
    disc either perpendicular or parallel to the
  • The disk is always present within the flow, which
    is not the case with a ball valve.
  • Therefore, regardless of the valve position, a
    pressure drop is always induced in the flow.

Structure of the butterfly valves
  • The structure of the butterfly valve is very
    simple, small in size and light in weight with
    only a few parts in them.
  • According to butterfly valves manufacturers, only
    90-degree rotation is required for the valve to
    be opened and closed quickly.
  • The electric valve, at the same time, has good
    fluid control characteristics.
  • The thickness of the butterfly plate is the only
    resistance when the medium flows through the
    valve body and the valve is in a fully open
  • As a result, the pressure drop generated by the
    valve is very small and thereby it has better
    flow control characteristics.
  • When the valve is closed, the disc is turned in
    such a way that it fully blocks off the
  • In case the valve is fully open, the disc is
    rotated with a quarter turn, hence ensuring that
    an almost unrestricted passage of the fluid is
  • The valve, in some cases, may also be opened
    incrementally to throttle flow.

  • Butterfly valves are most economical for large
    lines in water treatment, chemical services, and
    fire protection systems.
  • General sizes available of the valve are 2 to
    48', although for certain butterfly valves
    manufacturers sizes up to 96 are available.
  • The butterfly valve is an economical choice for
    larger line sizes due to the valve design,
    including a small face-to-face dimension and
    lower weight than most of the other valve types.
  • Face-to-face dimensions and pressure ratings of
    the butterfly valves are complied with ASME,
    which enables the valve to be easily retrofitted
    in line regardless of the manufacturer.
  • The ASME pressure classes followed by most of the
    butterfly valves manufacturers include 150, 300,
    and 600 allowing a maximum pressure of 1500 psi.
  • Butterfly valves can be configured accordingly,
    i.e. it can be configured to operate either
    manually, electronically or pneumatically.

  • The electronically operated valves need a signal
    to the gearbox to both open or close.
  • Whereas for pneumatic valves, it can be either of
    the two sides single or double actuated.
  • Also, they operate the most rapidly amongst
  • Butterfly valves also come in with different
    styles and shapes.
  • Large pump lines and front suctions are two
    examples of butterfly valves that offer high
    performance across various systems.
  • This was a detailed description concerning
    butterfly valves and its various operating
    principles, structure, and applications.

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