The butterfly valve is a device that allows you to achieve better flow control. The design uses a metal disc that rotates a quarter of a turn around a fixed rod shaft at a time. The 90-degree turn allows quick control between the open and closed positions. In addition, the size of the disc is usually the same as the inner diameter of the adjacent pipe to provide full color capability.

Naturally, butterfly valves are manufactured in a variety of sizes and design configurations to provide specific flow control functions. As a result, different applications and industries include everything from HVAC and firefighting to mud and sanitation.

Advantages of butterfly valve

Light and compact

Butterfly valves are ideal for a variety of applications because they are very lightweight and provide reasonable flow control in a compact design. For more extreme fluid handling, you will usually want to use metal sealed valves, while soft sealed butterfly valves are best for low pressure and low temperature applications. The butterfly disk takes up very little space, but provides enough strength for most pump systems.

Simple and cost effective

Butterfly valve design is very simple, very low maintenance requirements. They are easy to install and operate. In addition, they are usually much cheaper than ball valves of the same size. They do not require much torque to operate efficiently and can be automated for energy efficient operation.

Fast and efficient

The 90-degree turning radius allows for quick sealing at start-up, providing more precise flow control with minimal effort to open and close the valve. Different butterfly valves need to be considered, including zero offset, double offset and triple offset. Stress often determines which type you need. The greater the offset, the more pressure the valve can handle.

Pressure control

In addition to precise flow control, butterfly valves are also excellent in terms of pressure control. They experience minimal pressure drops during operation before the fluid quickly recovers energy after leaving the valve. This allows the pump system to operate efficiently at a consistent fluid pressure.

Disadvantages of butterfly valve

Corrosion and viscous fluids

Viscous and corrosive fluids tend to wash the disc of the butterfly valve during operation, which can cause the disc to quickly break down and lose seal pressure. If you are dealing with high viscosity liquids, you may want to consider a more robust ball or gate valve instead of a butterfly valve.

Cavitation and blocking flow

When the valve is in the open position, it does not provide a full port due to the disc. In specific applications, this can lead to excessive debris buildup around the valve, cavitation problems, or the potential for blocking flow. If a full diameter is required, a ball valve may be a better solution.

Non-high pressure throttling

The opening of the butterfly valve is limited to between 30 and 80 degrees, making it very effective in low-pressure throttling applications. However, higher pressure may result in better results through the stop valve. To learn more about butterfly valves from a leading valve manufacturer and determine if this is the right solution for your application and pump system, contact DXP Pacific today. Let our pump experts help you find the right equipment to optimize your production.

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