In this week’s post, our colleague Steve Da Shi is explaining the features and how does the Finetrol balanced plug control performance differ from the other eccentric plug designs:
Although Finetrol belongs to the eccentric plug valve category (IEC 60534-1 Sect 220.127.116.11), it has design differences that distinguish it from other eccentric plug valves currently available on the market. One of the special design features is a balanced plug that delivers benefits when it comes to better accuracy in flow control.
The patented Finetrol™ plug is contoured with a plug tail-element that balances the flow force and provides a wider valve opening from 0° up to 90°. The normal eccentric rotary plug valve only opens up to around 60°.
In a conventional eccentric plug design, the flexible arm connection between the plug and valve stem generates additional torque against the valve stem by the flow forces. Depending on the available actuator torque, this can create challenges for the valve’s controllability and stability, especially when the valve opening is small.