Electric Actuator - SQX Range | Bernard Controls | Philippopoulos s.a.
Electric Actuator - SQX Range | Bernard Controls | Philippopoulos s.a.

Electric Actuator - SQX Range | Bernard Controls

Bernard Controls SQX Electric Explosion-Proof Actuator

The SQX series comprises electric quarter-turn actuators for ball valves, butterfly valves, plug valves, and dampers in hazardous areas requiring explosion-proof protection. Direct torque output ranges from 80–800 Nm, with engineered solutions up to 1,000,000 Nm using appropriate gearboxes.

Standards and Operating Environment

  • ATEX, IECEx, CSA/FM, INMETRO, EAC certifications for Ex-rated installations.
  • NEMA 7 / NEMA 9 for North American hazardous location compliance.
  • IP68 10 m / 96 h and NEMA 6 ingress protection.
  • Duty classes per EN 15714-2: On-Off (Class A), Inching/Positioning (Class B), Modulating (Class C).
  • Ambient temperature: -20 to +70 °C, with low-temperature option down to -60 °C.

Control and Feedback

Standard configuration includes INTELLI+ integrated control, local indication, position and torque sensors, adjustable torque limits, and PST (Partial Stroke Test) capability. Torque is adjustable from 40–100% of nominal in 1% increments. Absolute position sensing is battery-free.

Electrical Signals and Communication

Supports 3-phase, single-phase, or DC supply up to 690 V, 50/60 Hz. Analog control (4–20 mA / 0–10 V), position and torque outputs, fault relay, additional signaling relays, and fieldbus options (Profibus DPV1, Modbus RTU, Foundation Fieldbus, HART) are available.

Applications

Used in oil & gas, chemical plants, fuel gas systems, storage tanks, ESD isolation, steam lines, process water, and industrial gas networks. Media compatibility is determined by the valve; SQX selection is based on torque, 90° operating time, Ex zone, supply voltage, duty class, and feedback requirements.

FAQ

When is SQX selected over SQ?
When Ex certification and explosion-proof enclosure are required by the installation.

What is checked during maintenance?
Ex cable glands, grounding, IP sealing, torque settings, PST, handwheel operation, alarm history, and signal integrity to PLC/DCS.

Datasheet and documents

Description

PRODUCT SPECIFICATIONS

TORQUE RANGE

  • 80 to 800 Nm (direct)
  • Up to 1,000,000 Nm on request

COMPLIANCE WITH INTERNATIONAL EXPLOSION-PROOF STANDARDS: ATEX, INMETRO, IEC-EX, EAC-EX, NEMA 7 & 9...

TYPE OF CONTROLS:

  • Electromechanical SWITCH
  • Hardwired
  • Smart INTELLI+® (v2)
  • SIL2

BC DUTY & MODULATING CLASSIFICATION:

  • On-Off: Class A+
  • Inching / Positioning: Class B+
  • Modulating: Class III

ENVIRONMENT: IP 68 / C3 UP TO C5-M / T: -20°C ...+70°C (OPTION LOW T: -60°C)

SPECIAL CONFIGURATIONS: CORROSION PROTECTION, FIRE PROOFING, EXTREME TEMPERATURES

PRODUCTS BENEFITS

  • Asynchronous motor with high starting torque & S4 Service duty
  • Gears are self-locking
  • Non-rotative declutch-free handwheel with electric motor priority
  • INTELLI+® integrated control available: advanced control solution for your critical applications
  • Double sealing
  • Partial stroke test (PST) included
  • Programmable timer
  • Separated control box & LCS available
  • Wide range of fieldbus available
  • SIL certification as an option

Accessories & Compatibility