Butterfly Valves

PCI has a complete range of Butterfly Valves based in Geelong. These include wafer, lugged and double flanged variants in Cast Iron, Stainless Steel and UV stabalised PVC. These Butterfly Valves can be combined with different kinds of actuation such as manual (lever), gear box, double acting pneumatic, spring return pneumatic or electric operation. Many models hold watermark and standards mark certification for civil and potable water applications. Butterfly valves are a popular option for valves above 50mm due to the economic deisgn of the valve when compared to other valve designs.

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What Makes it a Butterfly Valve?

The main thing distinguishing a butterfly valve from other valves is its design and operation. Unlike gate valves, which use a wedge-shaped gate to isolate, butterfly valves use a flat, circular disc that rotates around an axis perpendicular to the flow direction. This design allows for quick opening and closing, making them suitable for applications that require rapid opening or closing.

How Do Butterfly Valves Work?

Butterfly valves work by rotating a flat, circular disc within a pipe to isolate the flow of fluid or gas. The disc is attached to a shaft that runs through the centre of the valve body, and the shaft is connected to an actuator that rotates the disc. When the disc is rotated so that it is perpendicular to the flow direction, it blocks the flow completely. When it is rotated so that it is parallel to the flow direction, it allows maximum flow. The disc can also be positioned at any angle in between to allow a degree of flow regulation.

How Butterfly Valves Compare to Ball Valves

Although butterfly valves and ball valves share some similarities in terms of their function, they differ in their design and operation. Butterfly valves use a flat, circular disc that rotates around an axis perpendicular to the flow direction, while ball valves use a spherical ball with a hole in the centre that rotates within a housing. Butterfly valves are typically used on applications larger than 50mm where they become more economical than the same size ball valves. Ball valves will generally give a tighter seal but also require more torque to operate than the equivalent sized butterfly valve.

What Industries Would Use a Butterfly Valve?

A butterfly valve can be used in a wide range of industries that require fluid or gas isolation or basic flow control. Some of these industries include the chemical and petrochemical industries, HVAC and building services, and the pharmaceutical and biotech industries. On top of that, these valves can also be used in water and wastewater treatment plants to isolate or regulate the flow of water in the treatment process. Plus, they are often utilised in the food and beverage industry by isolating the flow of products in processing and packaging applications. Some types of Butterfly valves can even be used to isolate the flow of water, steam and gases in power generation plants.