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Flowserve Corporation has introduced the Limitorque QX valve actuator to its range of electronic actuators.

The Limitorque QX is a quarter-turn, smart electronic valve actuator designed to enhance safety and reduce downtime through improved diagnostics, built-in self-test (BIST) features, and Limigard fault protection capabilities.

The Limitorque QX complements the multi-turn MX actuator by including an absolute encoder, which tracks position without the use of batteries.

The Limitorque QX uses the technology of brushless DC motors, which eliminates sparks, reduces mechanical and electrical noise, and dissipates heat better than DC motors with brushes.

A brushless actuator is designed to last longer than conventional motors and allows for more accurate positioning.

The Flowserve Limitorque QX is available for optional multi-turn functionality.

Designed to thrive in the most extreme and harsh environments, the actuators are powder coated in a polyester resin.

The actuators are double sealed, containing any leakage within a separate terminal compartment, and include solid-state components for higher reliability and specification.

The Limitorque QX features an LCD screen control panel, which can be rotated 180deg.

Available in 10 languages, including English, Spanish, French, Italian, German, Portuguese, Japanese (Katakana), Mandarin, Russian and Malay, the panel supports diagnostic graphs for clear data analysis and collection.

Flowserve introduced absolute encoder technology for smart actuators in the Limitorque MX, and continues its use in the Limitorque QX.

An absolute encoder helps simplify valve automation through configuration and setup, normal operations, diagnostics, and troubleshooting.

The QX encoder employs system-on-chip technology, which uses a pair of contactless magnets that excite Hall-effect devices and provide redundant, 12-bit resolution over 360deg.

The implementation of a redundant encoder design means the device can continue to function reliably even after a number of faults have been accumulated.

The redundancy feature is part of the BIST functionality of both the MX and QX.

The BIST feature is incorporated into a controls platform that verifies and validates the reliability of its components, a design that aids companies in meeting the Safety Integrity Level (SIL) requirements of IEC 61508.

The Limitorque QX has Limigard circuit-protection technology, which continually monitors the motor and control relays, internal logic circuits, and external command signals to detect and alarm malfunctions.

The actuator has optional digital components and can operate on a number of networks with different protocols including Foundation Fieldbus, Profibus DP and Profibus PA, Modbus and Devicenet.

This helps the software identify preventative maintenance concerns, reduce downtime and improve operational efficiency.

The Limitorque QX offers Bluetooth wireless connectivity at a range up to 10m.

When used with Limitorque Dashboard Windows-based software, diagnostic information can be transferred to a Windows mobile-equipped personal digital assist (PDA), laptop computer or mobile phone.

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