How Butterfly Valves Work

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This 3D animated video explains how the butterfly valve works. We look at the valve’s main parts, how it functions, advantages and disadvantages.

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▶️Butterfly valves can be used to stop, start and regulate flow.

Butterfly valves are rotary motion valves, also known as quarter turn valves. Quarter turn valves are fast to operate as they only require 90 degrees of rotation in order to move from the fully open to fully closed position.

A gearbox can be used to make operation of the valve easier for the operator. Gearboxes allow for incremental movement of the valve although the response time (how long it takes to move from the open to close position, or vice versa) is longer.

The butterfly valve offers great advantage compared to the ball and gate valves as it is comparatively small, this is particularly true as the flow capacity of the valve increases.

Butterfly valves have a very low pressure drop and are well suited to high flow, low pressure, systems. The butterfly valve is ideally suited for large pipe bore applications and offers very little resistance to flow when fully open.

Like most common valve designs, butterfly valves consist of an actuator, stem, disc, bonnet and body.


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