If you have an application that requires you to continuously and accurately regulate a fluid’s flow rate, you are probably using a control valve. Control valves are designed to have either linear or rotary motion. Is your valve's motion right for your process? Does it really make a difference?
The linear-style valve is the most common type of valve available today. It is well-known for its simple design and ease of maintenance. Linear valves, also known as multi-turn valves, have a sliding-stem design that pushes a closure element into an open or closed position. These types of valves are extremely versatile with many different trim sizes and design options available. A linear-motion valve is also more resistant to cavitation compared to a rotary valve. Although linear valves are typically more expensive, they offer precise accuracy and 1:1 linear flow control.
A globe valve would be an example of a control valve with linear motion.
It should be noted that rotary valves are limited to certain pressure drops and are known to have cavitation and flashing problems. However, as technology continues to advance, these problems are becoming less common.
A v-port ball valve, like the one pictured here, is a great example of a control valve with rotary control.
Still not sure if a linear or rotary control valve is ideal for your application? Ask us about it! We have a team of experienced engineers who are happy to provide technical assistance to businesses in Wisconsin and Upper Michigan.