Cost-efficient valve design
21 June 2011
Metso has introduced a new valve design derived from its traditional V-port segment valve series. The new two-way-tight, single-seat design is said to be suitable for a range of applications and is available for R-series valves.
The optional two-way-tight feature covers the size range from DN25 up to DN700 in all available pressure classes.
Although the V-port segment valve series is said by the company to improve process performance and reduce variability in control applications, it was aware that there are many applications where two-way-tight, on-off type performance is required. The new V-port segment valve design offers the possibility of combining control and on/off performance in a single valve assembly.
The standard bi-directional shut-off classifications of the V-port segment valves are according to 10x ISO Rate D / FCI 70.2 Class IV; optional improved tightness classes are ISO Rate D / FCI 70.2 Class V at dp 20 Bar.
One of Metso’s paper mill customers installed a DN 600 RE flanged, V-port segment valve in a steam discharge application. In this particular case, low-pressure, superheated steam flows through the two-way-tight valve at 200°C. A traditional valve solution for this application would have been a two-way-tight ball valve. However, by selecting the new two-way-tight, V-port segment valve, the customer was able to save 50% on capital costs.
There are many applications in pulp mills where two-way tightness is required. For example, there are many such valves next to batch and continuous digesters. In the bleaching department, the on-off valve after the chemical mixer is typically quite large and can require the two-way tightness feature.
The two-way-tight option is available for both RA and RE valve series for all standard pressure classes and flange drillings. It is also available in all standard body materials.
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