What Is a High-Performance Butterfly Control Valve? 

• Single Offset – Allows the continuous seal 
• Double Offset – Reduces seal wear 
• Triple Offset – Isolation / On-Off 

High-Performance Butterfly Control Valves are intended for general service and do not require precision control. They are often used in applications that require larger sizes and high temperatures due to their low cost of maintenance in comparison to other variations of control valves. They excel in constant process load applications.  

The control range for high-performance butterfly valves is approximately 30 to 50% open, a third as large as a ball or globe-style valves. Butterfly valves have become available with contoured disks that provide an inherent equal percentage flow characteristic, which gives a linear installed characteristic.  

Definition For Control Valve 

A control valve is a power-operated device that modulates the fluid flow rate in a process control system. The control valve assembly has a significant impact on process control performance.  

Applications For High-Performance Butterfly Control Valve 

• High Flow / Low-Pressure Drop applications where the process is clean.
• Limited control range (between 25% / 50%).
• Fisher’s new Control Disk™ stretches control range between 10% to 70% open.

Control Valves – Key Takeaways 

• Valve, actuator & positioner combination is key to controll valve performance.
• Several Styles of Rotary Control Valves – Choice dependent upon pressure drop, rangeability, and fluid.
• Actuation is very important in control applications -Spring & diaphragm provide the best control.
• Positioner – Key element to maximise control performance.
• Process Conditions and customer requirements determine ultimate selection.