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Moog provides Servovalves for the World

Moog Controls : 04 August, 2006  (New Product)
Moog is supplying over 600 digital Servovalves and Servo-Proportional valves on a new machine developed by pulp and paper industry machinery builder Metso Paper, Inc., Jyvaskyla, Finland. Moog
Moog is supplying over 600 digital Servovalves and Servo-Proportional valves on a new machine developed by pulp and paper industry machinery builder Metso Paper, Inc., Jyvaskyla, Finland. Moog’s Digital Interface Valve (D638 Series) and the Digital pQ Servo-Proportional Valves (D941 Series) will be used on Stora Enso´s, Kvarnsveden mill, new high quality SC paper machine with start-up.

This new paper machine has a wire width of 11.3 meters and a speed of 2000 meters per minute, which will make it the world’s largest paper machine. Metso Paper is the global market leader of papermaking lines and is a leading supplier of pulping equipment and board making lines.

Moog has developed a new hydraulic valve platform, Digital Interface Valves, with microprocessor based electronics and a fieldbus interface. These new valves can replace analog technology and offer configurable functions that enable customers to define the dynamic behavior of the valve and adapt its characteristics to particular application requirements, while providing high-precision digital flow and pressure control. These valves are central to implementing a distributed control concept in a machine because tasks can be assigned to local devices rather than the main control device, providing our customer’s machines with increased flexibility and functionality.

Recently, Metso Paper challenged Moog to provide a very accurate pQ control that included failsafe features for a multiple axes, running continuously on a paper machine, according to Jocke Gabran, Area Manager, Moog Finland. Gabran met with representatives of Metso Paper and recommended Moog’s D638 series NG 6, which is currently the most compact NG6 size Digital pQ available on the market and the D941 series NG10, which combines digital electronics with high flow capabilities.

Moog’s Direct Drive Servo-Proportional Valves, Digital Interface Valve (D638 Series), are operating in multiple applications around the world. Prototypes are being tested for other models including the Digital pQ Servo-Proportional Valves (D941 Series) for pressure control and pressure limiting applications. This new product development platform is part of Moog’s ongoing initiative to extend digital intelligence to its most advanced hydraulic and electric motion control products.

Key benefits of Digital Interface Valve products for customers are:

Fieldbus Communication: Diagnostic capabilities, integrated monitoring of key environmental and internal characteristics, and valve parameter modifications can be accessed on-site or remotely.
Flexibility: The ability to download parameters via the fieldbus connection or directly from the upper PLC program enables optimum tuning of valve parameters during the machine cycle, even while the machine is operating. The Windows-based graphical user interface is easy to learn and convenient
Cost Savings: Since the pressure control loop can be tuned via software rather than passive electronic components, it is now possible to stock a single valve for multiple applications reducing the need to stock several valve models.
Lower Installation Costs: A serial wiring scheme reduces the amount of wiring and improves noise immunity.
Some special benefits of the design of the pQ Servo-Proportional Valve (D941 Series) include:

Superior Control: The improved frequency response of the design allow high spool position loop gain, providing excellent static and dynamic response and superior control system performance. The improved valve dynamic performance is due to the extremely high natural frequency of the ServoJet pilot stage (500 Hz) and the implementation of advanced current control algorithms, which is only possible via digital electronics.
Energy Savings: Considerably improved flow recovery (more than 90% of the pilot stage internal leakage flow) contributes to energy savings, especially for machines with multiple valves.
Reliability: The high-pressure recovery of the ServoJet pilot stage (more than 80% delta p at 100% command signal) provides higher spool driving forces and ensures enhanced spool position repeatability.
Safety: Fail-safe versions with defined safe spool position using a spring, a poppet valve or by external supply cut off ensure operator safety.
'Our relationship with Metso goes back to the mid 1980´s. We started supplying them with mechanical feedback valves, then moved on to electric feedback valves and now are taking them into the new digital valve technology,' said Gabran.
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