Butterfly Valve and Ball Valve Facts

Published: 20th October 2011
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Butterfly valve fully open to fully closed is generally much less than 90 , butterfly valves and butterfly bar itself isn't self-locking capability, in order to position the disc to install the valve stem worm reducer. With worm reducer, not only to create the disc has a self-locking capability, so the disc to quit at any position, but also to enhance the operability of the valve.

Industry-specific characteristics of butterfly valves to high temperature and higher applied pressure range, the valve nominal diameter larger body with carbon steel, valve plate to replace rubber seal ring with metal ring. Big butterfly valve with high temperature of steel plate, primarily for high-temperature medium Flue and gas pipelines.

How does Butterfly Valve Work?
Butterfly valve is used for opening and closing pieces of circular disc and also the turning of the stem to open, close and adjust a valve fluid channel. Butterfly valve panels installed on the pipe diameter direction. Cylindrical channel within the valve body, disc-shaped disc around the axis of rotation, rotation angle 0 ~ 90 between the rotation to 90 , the valve is open all license conditions.

Numerous different types of valves are used in flow control. They are used for a variety of reasons, such as phase (liquid or gases), pressure, piping restrictions and solids content. Other valves are chosen for their capability to open and close in a quarter turn. Of all of the valve types, the butterfly valve is used as a control device for numerous factors such as some or all of the above.

This write-up explains the workings of a butterfly valve and its operation. The butterfly valve offers many benefits that consist of quarter-turn, openness for less plugging and great control capabilities. Both manual and control versions are utilized.

Rotating disk
A butterfly valve is a flow control device that incorporates a rotational disk to control the flowing media in a procedure. The disk is usually within the passageway, but simply because it is relatively thin, it offers little resistance to flow.

Butterfly valve technologies has evolved dramatically over the past half century, as has its industry popularity. This popularity can be partly attributed to the quarter-turn operation, tight shutoff and its availability in a variety of supplies of construction.


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Early use of butterfly valves focused on water applications, but new designs and component supplies have allowed them to be utilized in growing industrial fluid applications. Presently, butterfly valves can be found in almost every chemical plant handling a variety of diverse fluids.

Butterfly valves range in size from 1 in to much more than 200 in and most have a pressure capability of 150-psi to 740-psi cold working pressure. The general temperature rating for a resilient seated valve is 25 Degrees F to 300 Degrees F and 400 Degrees F to 450 Degrees F for a high-performance butterfly valve.

The butterfly valve may be utilized for on-off service or modulating service. Actuation is typically achieved either manually (handle, wrench, gear operator) or via an external power source to cycle the valve automatically.

Automatic actuators consist of electric, pneumatic and hydraulic operators.

There are lots of advantages offered by butterfly valves compared to other types of valves including an inherently easy, economic style that consists of fewer parts, which makes butterfly valves simple to repair and maintain.

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