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?

1. The Working Principle
Behind A Butterfly Valve

2. INFORMATION
• 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.

3. 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 passes.
• The actuator, as it starts rotating, turns the disc either perpendicular or
parallel to the flow.
• 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.

4. 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 position.
• 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 passageway.
• 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 allowed.
• The valve, in some cases, may also be opened incrementally to throttle
flow.

5. Applications
• 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.

6. • 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 others.
• 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.

7. CONTACT US
www.gmengg.com
valve@gmengg.com
+91 2827 287658
+91 92280 05558
+91 92280 05559
G M ENGINEERING PRIVATE LIMITED
Plot No: 2632
G.I.D.C., Lodhika
Metoda – 360 021 (Rajkot).
Gujarat [INDIA]