Metso Automation has launched the new Neles® RotaryGlobe control valve, which combines the best features of proven linear and rotary valve technologies in small-bore control valves capable of operating cost-effectively up to ASME 1500 pressure class. The globe-style body design leads to a high pressure-recovery factor and minimizes potential leak paths and provides enhanced anti-cavitation performance, whereas the rotary motion stem is employed to provide improved control of fugitive emissions. And, as in globe valves, the interchangeable trim selection includes low Cv, low noise and anti-cavitation trims to meet a wide range of applications with the same basic valve design. These factors combined with compact size and the low emission characteristics of a rotary valve create a unique design, which offers higher standards of performance in flow-control accuracy and reliability, whilst reducing lifetime costs and maintenance requirements. The valves are designed to control a wide range of process liquids, gases and vapours in normal, difficult and even severe service. Applications for the new valve span the petrochemical, chemical, oil and gas, refining, power generation and pulp and paper industries.
The modular design offers interchangeability of parts across the size range, a choice of body materials and a range of linear, equal percentage and balanced trims to accommodate even difficult applications; for example, under high-noise conditions, the low-noise trim can reduce noise by up to –20dB.
The new valve, available in the size range from ½ in. to 2 in., operates in the temperature range –80 C to 425 C and meets all the requirements of both ASME and EN standards. It also fulfils all the latest safety requirements and environmental standards, e.g. TA-Luft, Clean Air Act, ISO 15848-1.
Since the beginning of 2006, a significant number of the new valves, equipped with Neles actuators and Neles ND9000® intelligent valve controllers, have been undergoing extensive tests in customers’ processes all over the world. Well over 100,000 field test hours in a range of duties and across a wide range of industries have been completed during the first quarter of 2007.
The Neles RotaryGlobe control valve has been specifically engineered for easy maintenance. For example, inline service is provided by the top-entry design. Internal parts, Cv values and flow characteristics are easy to change using interchangeable trim parts. Metso’s latest Neles ND9000® intelligent valve controller ensures the high standard of control performance; its user-friendly software with online diagnostics enables true predictive maintenance capabilities.
