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Apr 2, 2015
Achieving better accuracy in flow control with a unique plug shape
Mr. Da Shi
Technical Product Manager, Neles, Shanghai
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 126.96.36.199), 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.
To improve controllability and stability, Finetrol’s plug balances the flow forces by bringing them closer to the stem’s centerline to reduce the dynamic forces during valve operation. Thanks to its unique plug shape, the tail element of the Finetrol plug can be extended to the maximum opening angle – from 50° or 60° to a full 90°.
Cv-value vs opening angle of Finetrol™ and Competitor’s product (size 1½”)
Even if the flow coefficient Cv does not increase by much, Finetrol™ can still modulate the same flow capacity with a significantly wider valve opening range. This results in a much better control resolution, which brings more control accuracy to both large and small flows. Ultimately, this leads to better valve operation, longer lifetime and less maintenance along with a lower risk of compromising production safety.
This blog post has been up-dated in July 2020, due to company name change to Neles.
Neles™ Finetrol™ eccentric rotary plug valve is designed for liquid, gas, vapor and slurry control in general and demanding applications. Neles Finetrol is certified to SIL 3. Excellent control performance and capability to handle impure fluids makes Finetrol well suited in refining and petrochemical industry applications.
Neles globe valves are high performance control valves designed to provide the best possible control accuracy and wide rangeability with all the inherent benefits of linear control valves. The quick-change trims and top-entry construction enable easy valve assembly and service, leading to extended operational life. Wide range of various trim designs are available from standard to low noise and anti-cavitation applications. Keeping track of the performance of the globe valves is simple with online monitoring. Neles globe valves are certified to SIL 3.