June 14, 2011 - Metso enhances R-series valves with a two-way-tight, single-seat design suitable for a wide range of applications. The optional two-way-tight feature covers the size range from DN25 up to DN700 (1” up to 28”) in all available pressure classes.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. There are a lot of applications where two-way-tight, on-off type performance is required.
The customer benefit is that it offers the possibility of combining control and on/off performance in a single valve assembly. The standard bi-directional shut-off classifications of the 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 @ dp 20 bar. In pulp mills there are many applications 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.
