HEA(M) Series Compact Multi-Turn Electric Valve Actuator (50–300 N·m) for Gate, Globe & Knife Gate Valves

Feature & Technical Spec

Engineering & Buyer Advantage

Certifications & 18-Month Factory Warranty

Hearken Flow HEA(M) Series multi-turn electric valve actuators are manufactured in accordance with the ISO 9001:2008 standard. We have applied for CE certification, SIL 3 certification, RoHS compliance, and an IP67 protection rating, and come with an 18-month manufacturer’s warranty.

International safety and quality certifications simplify the qualification review process for engineering bids and help you avoid import clearance delays for global distributors.

Compact Design and Lightweight Enclosure

All 50–300 N·m models use a high-strength die-cast aluminum alloy enclosure with a standard net weight of only about 10 kg.

The lightweight design greatly reduces international air and sea freight costs, simplifies manual handling during installation, and reduces structural stress on the valve stem and piping.

50–300 N·m Torque Output & Controlled Speed

At a stable output speed of 5–6 r/min, the actuator provides rated output torques of 50 N·m (HEA005M), 100 N·m (HEA010M), 200 N·m (HEA020M), and 300 N·m (HEA030M).

Hearken Flow HEA(M) multi-turn electric valve actuator provides enough seating and unseating torque for multi-turn valves while maintaining optimal operating speed to avoid water hammer in the pipeline.

Dual Drive Standards (JB/T 2920 & GB/T 12222)

We use F10/F12 flanges with ISO 5211 (PCD 102/125 mm); it supports direct installation of JB/T 2920 torque-type (non-stem-lifting, max. Φ28 mm) and GB/T 12222 thrust-type drive sleeves via standard adapter flange/sleeve kits, making it suitable for stem-lifting valves.

Our HEA(M) Series multi-turn electric valve actuator can be installed directly and compactly on non-stem-lifting valves, while providing standardized adapter flanges and connection solutions for stem-lifting gate valves and globe valves, simplifying mounting for OEM valve manufacturers.

Suitable Valve Size Range

Standardized torque is suitable for gate valves (DN15–DN200), globe valves (DN15–DN100), and knife gate valves (DN50–DN250) across various pressure ratings (up to PN16).

You can select the exact model required based on the specific specifications of each valve to avoid failures caused by insufficient torque while avoiding unnecessary costs resulting from oversized valves. 

360° Installation Flexibility

IP67 weatherproof housing and symmetrical internal drive mechanism allow the actuator to be installed at any angle within a 360° range (vertical, horizontal, or angled).

Hearken Flow offers maximum installation flexibility in tight pipeline spaces and confined industrial environments.

Modular Control Architecture (On/Off & Modulating)

Hearken Supply standard On/Off or fully integrated with the KZQ-10L smart modulating controller supporting 4–20 mA, 0–5 V, 0–10 V, and RS-485 Modbus RTU.

You can source both standard on-off actuators and high-precision regulating actuators from a single factory, matching diverse project budgets and customer specifications.

High-Precision PID Regulation & Adjustable Deadband

The modulating multi-turn valve electric actuator uses advanced PID control algorithms with deadband sensitivity continuously adjustable from 0.1% to 3.0%.

It can provide precise multi-turn valve position and stroke control across intermediate travel points while effectively suppressing motor hunting and reducing mechanical wear on gear trains.

16-Fault Self-Diagnostics (Er0–Er15) & Fail-Safe Actions

Integrated electronic protection includes 16 fault diagnostic codes (Er0 through Er15, corresponding to stalled rotor, phase loss, sensor failure, and overtemperature, respectively) and programmable fault-safe responses (fault hold, fault disconnect, and fault shutdown).

Supports rapid on-site troubleshooting, provides remote alarm signals, and protects critical pipeline assets during unexpected signal loss or electrical failures.

Problem

Possible Cause

How do we solve it?

Power Indicator & LCD Screen Off

• Power supply is not connected, or voltage is too low.

• Incorrect incoming power wiring.

• Internal power module or transformer damaged.

We need to use a multimeter to verify incoming AC/DC voltage, check power terminals (L/N or U/V/W) against the wiring diagram, and replace the power board if incoming power is normal.

Abnormal Indicator & Screen Display During Operation

• LCD screen or LED indicator damaged.

• Fault code actively triggered.

• Main control circuit board fault.

We need to inspect the digital display for specific error codes, verify supply voltage stability, and replace the display panel or main control circuit board if damaged.

No Operation in Both Local & Remote Modes

• Torque/limit switch wiring is open-circuit or tripped.

• Motor thermal switch is open.

• Controller locked in fault protection mode.

• Motor drive circuit / solid-state relay failure.

We need to check torque and thermal switch wiring continuity (terminals 18–20), power-cycle the HEA(M) series multi-turn electric valve actuator to clear fault locks, and inspect the motor drive circuit.

Local Mode Operates, but Remote Control Fails

• Actuator is not set to "Remote" mode.

• Remote 4–20 mA signal is reversed, disconnected, or missing.

• Position feedback potentiometer unmeshed or slipped.

• Remote control parameter (iP) configured incorrectly.

We press the “Switch” button to switch to remote mode, verify the polarity of the 4–20 mA loop, check the sensor gear meshing, and set the parameter to P=9.1 (iP=0 indicates modulation; iP=1 indicates on/off).

Local Cannot Operate, but Remote Operates

• Actuator is locked in Remote mode.

• Local pushbuttons are stuck, worn, or not fully pressed.

• Local pushbutton circuit board damaged.

We press the “Switch” button to enter local mode, check the mechanical operation of the button, and test the continuity of the keyboard contacts.

Operates in One Direction Only

• Corresponding directional torque/limit switch wiring is open or faulty.

• Actuator hit mechanical travel limit or over-torque stop.

• Motor single-phase winding open, stalled, or wired incorrectly.

• Drive circuit component damaged.

We need to verify the continuity of the limit switches and torque switches, clear any mechanical obstructions from the valve seat and valve stem, measure the resistance of the motor windings, and inspect the drive circuit.

Immediate Operation on Power-Up Without Control Signal

• Wiring connection error.

• Signal-loss fail-safe action triggered (set to Fail-Open or Fail-Close).

• Unexpected control signal presence.

• Configured for 2-wire control mode.

We need to check the control terminal connections, verify the fail-safe behavior (hold/on/off) for parameter P=2.1 (I=0/1/2/3) in the event of a signal loss, and verify the status of the input signal.

Operates at Intermediate Positions, Stops at Limits

• Torque switch wiring reversed.

• Valve disc/stem mechanically jammed upon reaching end limits.

• Limit circuit wiring open.

• Drive circuitry damaged.

We need to check the wiring polarity of the limit switches and torque switches, verify the valve seats are properly aligned to avoid sticking at the end of the stroke, and check the continuity of the wiring.

Action / Movement Direction Reversed

• Motor phase/winding wiring reversed.

• Zero/Span valve stroke calibration was performed in reverse.

• Direct/Reverse action setting (Ac) is configured incorrectly.

• Analog command signal polarity inverted.

Adjust the phase sequence of the motor wiring, recalibrate the zero position and full-stroke limits, or adjust parameter P=2.1 (Ac=0 indicates forward action; Ac=1 indicates reverse action).

No Output Current Feedback or Intermittent

• Output 4–20 mA feedback loop wiring loose or disconnected.

• Feedback potentiometer or encoder sensor damaged.

• Analog feedback circuit board damaged.

We need to check the feedback terminal connections (terminals 6 and 7), verify the signal loop continuity and load resistance (≤500 Ω), and test the sensor resistance linearity.

Feedback Current Drift, Inaccurate or Static

• Feedback potentiometer or encoder sensor faulty.

• Output current calibration error.

• Sensor drive gear slipping or improperly meshed with main shaft.

• Circuit board fault.

We need to tighten the sensor drive gear set, check the meshing between the gears and the main shaft, and recalibrate the output zero point (oL=4 mA) and range (oH=20 mA) via menu P=1.1.

Problem

Possible Cause

How do we solve it?

LCD displays Er0 (Power Phase Loss)

380 V AC 3-phase incoming power is missing a phase, or the power terminals are loose.

We need to inspect the incoming 380V AC 3-phase power lines using a multimeter to confirm phase balance and secure all wiring connections at the power terminals.

LCD displays Er1 (Parameter Storage Error)

The internal memory parameters have not yet been initialized, or the standard 4–20 mA input/output current calibration has not yet been performed.

We need to go to parameter menu P=1.1 to calibrate the 4–20 mA output current (oL/oH), then go to menu P=11.1 to calibrate the 4–20 mA input current (iL/iH), and finally save the settings via P=5.0.

LCD displays Er2 (Internal Over-Temperature)

HEA(M) series multi-turn electric valve actuator internal operating temperature is higher than the safety limit (default 85°C) due to high ambient heat or higher than the duty cycle ratings.

We need to stop the operation to allow the motor to cool down, verify that ambient ventilation complies with operating limits, and reduce the operating frequency to match the rated duty.

LCD displays Er3 (Opening Stall Protection)

When power is applied to the motor, the valve opens; however, due to mechanical binding, a seized valve stem, or gear slippage, the position sensor does not detect any change in the valve’s travel.

We inspect the valve stem, packing gland, and actuator drive bush for mechanical binding or foreign debris, ensuring the valve disc rotates freely.

LCD displays Er4 (Closing Stall Protection)

The motor is energized to close, but the position sensor detects no valve stroke movement due to line blockage, high differential pressure, or tight packing.

We need to check the valve stem, stuffing box, and actuator drive sleeve for mechanical binding or foreign objects, and keep the valve disc can rotate freely.

LCD displays Er6 (Control Signal Loss / Too Low)

The 4–20 mA command signal from the DCS/PLC is disconnected, the polarity is reversed, or the input loop current is below 3.0 mA.

Check the loop wiring at input terminals 4 (+) and 5 (-), measure the signal current with a multimeter, and if the signal source has drifted, recalibrate the input zero-current (iL).

LCD displays Er7 (Control Signal Over-Current)

The input analog command signal exceeds 150% of the rated calibration standard due to an analog output card fault or wiring surge.

We need to check the DCS/PLC analog output channel, verify signal loop resistance (<250Ω), and recalibrate the input range (iH) using a stable 20.00 mA signal.

LCD displays EL (Limit / Torque Switch Reversed)

At the terminal block, the wires for the torque open and torque close microswitches were reversed.

We need to swap the torque open wire and the torque close wire on the internal terminal block.

LCD displays Er9 (Signal Outside Electronic Limits)

The received control signal indicates that the valve position has exceeded the preset electronic lower limit (cL) or upper limit (cH).

Access parameter menu P=2.1 to check and reset the electronic travel limits (cL=0.0%, cH=100.0%) or recalibrate the range of the 4–20 mA control signal input.

LCD displays Er10 (Stroke Span Too Small)

The travel range between the zero (uL) and full (uH) calibration points is too narrow for reliable position sensing.

We need to recalibrate the travel limits by driving the valve to the true mechanical 0% (uL) and 100% (uH) positions to keep the sensor with sufficient travel range across the entire travel range.

LCD displays Er11 (Thermal Switch / Torque Common Disconnected)

The external motor thermal protection switch has tripped, or the torque common wire (Terminal 18) is loose or disconnected.

Test the continuity of the thermal protection switch circuit, and after the motor has cooled down, verify that the torque common wire at Terminal 18 is securely connected.

LCD displays Er12 (Potentiometer / Encoder Sensor Fault)

Position feedback sensor wires are loose, feedback drive gears are unmeshed/slipping, or the potentiometer is rotated into its dead zone.

We need to inspect the feedback sensor wiring (terminals 24–28), ensure the gear between the potentiometer and the drive shaft is meshing properly, and adjust the potentiometer to the valid linear range (500 Ω–10 kΩ).

LCD displays Er13 (Open Over-Torque Tripped)

The HEA(M) series modulating actuator encountered excessive resistance during the opening process or triggered the opening torque limit switch or opening limit switch.

We need to check the valve stem lubrication, packing friction, and pipeline pressure differential, and then verify the trip settings of the opening limit and torque switches.

LCD displays Er14 (Close Over-Torque Tripped)

The HEA(M) actuator encountered excessive resistance during the closing stroke or triggered the closing overtorsion or closing limit switch.

Check the valve seat for solid debris or scale that may be preventing the valve disc from sealing completely, verify the alignment of the valve disc, and check the setting of the closing torque switch.

LCD displays Er15 (Motor Rotation Direction Error)

Due to the reversed phase sequence, the motor’s direction of rotation is opposite to the counting direction of the position feedback sensor.

We swap any two phase wires of the motor (for example, the U and V terminals) to synchronize the motor’s rotation with the feedback sensor’s increments.