Description
The Flowserve Limitorque QXM, limited multi-turn, non-intrusive electronic valve actuator is designed for limited, short stroke, light torque rising stem valve applications such as choke or control valves in the power, oil & gas, and water industries.
- Non-intrusive electronic design
- Weatherproof, explosion-proof, and submersible applications
- 100% repeatable and redundant absolute encoder for position sensing
- 3-phase, 1-phase, and DC motors
- Lower operating costs compared to pneumatic actuators, with the added advantages of electrical operation
- Greater process control from accuracy that meets and exceeds EN 15714 (Class D) and IEC 60034 standards for modulating service
- Increased reliability via electromagnetic noise protection of analog process control signals, electronic torque switch
- All global explosion-proof certifications
- Meets pertinent European Directives (CE mark)
- Designed to meet EN-15714
- AWWA C540
Applications include choke valves and small control valves in upstream oil and gas, water and power markets up to 20 drive sleeve turns. The QXM encoder is the same one used in the Limitorque QX. It employs system-on-chip technology, which permits redundant, 12-bit resolution over 20 total turns or an accuracy of better than 2 degrees of rotation. This redundancy feature is part of the B.I.S.T. (built-in-self-test) feature of the QX and MX. QXM also utilizes the same brushless direct current (BLDC) voltage motor as the innovative QX smart actuator. The use of a BLDC motor will meet most global voltage requirements without the need to change motors. This unique feature is an advanced technology which eliminates sparks, reduces mechanical and electrical noise, and dissipates heat better than DC motors with brushes. A BLDC motor lasts longer than conventional motors and allows for more accurate positioning. This is especially important in functions which require choke valves and control valves. The use of a BLDC motor in conjunction with the absolute encoder assists in providing the precision that users are demanding in their processes. The Limitorque QXM is available for limited multi-turn valves that require a minimum of 18 ft-lb (24 Nm) to a maximum of 250 ft-lb (337 Nm) of torque and from 3–24 RPMs.
Modulating Service: QXM is available for modulating applications up to 1800 starts per hour
Network Service: QXM is available for network applications that utlize Modbus, Foundation Fieldbus, Profibus DP or PA, DeviceNet, and HART
Linear Control Valve Service: QXM is available for use with control valves that may require exacting position utilizing a linear thrust base
Torque Rating Range: From 18 to 250 ft-lb output torque