News - The Advantages of a Butterfly Valve

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Home > News > The Advantages of a Butterfly Valve - Part 1

The Advantages of a Butterfly Valve - Part 1 - 2013-06-21 14:37:10

A Soft seated butterfly valve, otherwise known as quarter-turn valves, isolate and control the flow of a liquid. Most often used in water or waste treatment, especially in the field of agriculture, butterfly valves also have the distinction of being one of the most common valve types on the market. Butterfly valves serve reliably even when heavy duty is required. These valves need very little maintenance and are extremely durable.
Butterfly valves are devices used for flow control, usually the flow of a fluid through a section of pipe. The butterfly valve operates similarly to an electric ball valve. A flat disc located at the pipe’s center has a rod running through it, which connects to the actuator on the exterior of the valve. Turning the actuator rotates the plate to a position either perpendicular or parallel to the flow. The flow may be regulated more specifically through different disc rotations.
The “butterfly” is the metal disc mounted on the rod. When the valve is in the closed position, the disc is rotated to a position in which it totally blocks the passage of liquid. When the Single Eccentric Butterfly Valve is open fully, the disc has been rotated one quarter turn, allowing for nearly unrestricted passage. Flow may be incrementally regulated by various positions of the valve. This advantageous feature of butterfly valves makes them ideal for many industrial uses. The size of butterfly valves is one more of their advantages. Since they are lighter and smaller than other valve forms, they do not necessitate the large degree of supporting structure required for other valves, such as the electric ball valve.
The butterfly valve has a resilient seat, a body, a butterfly disk, packing, a stem, an actuator, and a notched positioning plate. It has stainless steel, cast steel, cast iron, EPDM, NBR, ductile iron etc material. When the resilient seat is mounted in the valve body, it is under compression and makes a seal around the edges of the disk and the lower and upper points at which the stem runs through the seat. Packing provides a positive seal all around the stem for extra protection, should the seal made by the seat suffer damage.
Double Eccentric Butterfly Valve are available in different styles, such as high-performance and eccentric valves. Butterfly valves can be found on fire apparatus and large lines, such as tank to pump lines and rear and front suctions.
The design of the butterfly valve does give it a disadvantage, because unlike an electric ball valve, a portion of the disc will always be in contact with the liquid, regardless of whether it is in the open or closed position, and this causes a constant pressure switch regardless of the setting. Viscous or thick liquids also may slow the disc’s functional movement.
Though Triple Offset Butterfly Valve may be configured for electronic or manual operation, the most rapid is pneumatic control. The gearbox must receive a signal to both open and close an electric ball valve. However, an advantage to pneumatic operation lies in its flexibility, for it permits either double or single actuation. Single actuation requires a fail-safe, so that in the event of power loss, on a spring-loaded system, the valve will change to the closed position if open. So, a signal must be sent to open the valve initially. Double actuation valves need signals to both open and close the mechanism, because they are not spring-loaded.

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