HEA Series Rotary Electric Quarter-Turn Actuator (30 N.m – 2000 N.m) | ISO 5211 Direct Mount for Ball & Butterfly Valves

Feature & Technical Spec

Engineering & Buyer Advantage (For OEMs & Distributors)

Standard ISO 5211 Direct Mounting & Double-Square Drive

The bottom mounting flange complies with ISO 5211/DIN 3337 standards (sizes F03 to F12). We use dual internal star/square valve-stem drive interfaces (size range: 9×9 mm to 27×27 mm) and offer a round-keyed shaft option.

You can mount on quarter-turn ball valves, butterfly valves, and plug valves directly without expensive brackets or custom couplings. Our HEA actuator also supports both straight (0°) and 45° mounting, reducing mount time by up to 50%.

Dual Travel Limits and Built-in Auxiliary Signal Contacts

Hearken Flow HEA actuators use an internal microswitch (SPDT, 250 VAC, 10 A) featuring color-coded cams, as well as two auxiliary passive contacts for remote “on/off” status feedback; features an externally adjustable mechanical limit bolt (travel adjustment range: ±5°).

“On/Off” confirmation signals can be sent directly to the PLC/DCS without the external limit switch box; the dual mechanical limit design avoids excessive torque from damaging the valve’s soft seals and packing.

High-Efficiency Self-Locking Worm Gear Transmission

We use the precision alloy steel worm shaft and aluminum bronze worm wheel drive mechanism to provide a mechanical self-locking function to avoid reverse rotation caused by reverse flow of the medium or pressure surges. It operates at low noise levels of ≤50 dB and is lubricated with long-life extreme-pressure (EP) grease.

During power outages or pipeline pressure fluctuations, the valve remains securely locked in the 0° or 90° position without any positional drift. No periodic lubrication is required, making it 100% maintenance-free.

Class F Motor with Auto-Reset Thermal Overload Protection

Hearken Flow HEA actuators use High-torque, low-inertia, fully enclosed squirrel-cage motors with Class F insulation. The built-in thermal protector trips at 120°C ± 5°C and automatically resets when the motor cools down to 97°C ± 5°C.

The thermal overload protection helps avoid motor burnout caused by unexpected valve seat jamming, frequent start-stop cycles, or incorrect wiring, greatly reducing the risk of warranty claims and associated costs.

Anti-Condensation PTC Space Heater

An optional 5W–10W PTC heater is available (supports 220VAC, 110VAC, and 24VDC voltages). The space heater automatically regulates the internal temperature to keep electronic components and microswitches dry.

The space heater avoids internal moisture condensation and short-circuit failures caused by extreme fluctuations in temperature between day and night when installed outdoors or in tropical or cold climates.

Safe and Convenient Manual Operation

Includes an external hex spanner/lever mechanism stored securely in a dedicated housing clip (optional handwheel available for large sizes).

You can quickly adjust the position manually or test the valve quickly during commissioning or an unexpected power outage without disassembling the actuator.

Optional Extended Angles (180° / 270°) & Modulating

Hearken Flow HEA series rotary electric actuator supports a standard 90° stroke, as well as optional 180° and 270° multi-position strokes suitable for three-way and four-way directional control valves. Also available with proportional modulating cards (4–20mA / 0–10V) or RS485 Modbus RTU bus control.

You can meet standard on/off control requirements while easily offering extended stroke and smart modulating from a single supplier to address complex project requirements.

Problem

Possible Cause

How do we solve it?

Motor does not rotate or stops running with power connected

Internal thermal protector tripped due to continuous high-duty cycling or mechanical overload (which cuts off power at 120°C ± 5°C); loose supply wiring terminals or line voltage drop exceeding ±10%.

All Class F motors equipped on HEA actuators feature built-in automatic reset thermal overload protection: the power is automatically cut off when the temperature reaches 120°C and automatically resets once the temperature drops below 97°C. We advise using a multimeter to measure the line voltage at the power supply terminals and using the manual handle to check whether the valve rotates smoothly and freely.

Actuator rotates in the opposite direction of valve travel

The “Open” and “Close” control wires are reversed on single-phase AC/DC models, or the phase sequence is incorrect for 380V/440V three-phase power supplies.

For single-phase 110V/220VAC and 24VDC models, we suggest swapping the control wires for Terminal 2 (Open) and Terminal 3 (Close). For 380VAC 3-phase actuators, disconnect power and exchange any two phase wires (U/V/W); on KZQ digital HEA series actuators, rotation direction can also be changed directly via software parameters without rewiring.

Valve fails to seal completely (seat leakage) or actuator over-travels past 0°/90°

The internal limit switch cam has shifted or is not securely locked by the lock nut; the external mechanical limit bolt is improperly adjusted.

Our HEA series rotary electric quarter-turn actuator uses a dual-limit design (mechanical and electronic limits). We advise manually positioning the valve to the fully closed or fully open position, loosening the cam lock nut, rotating the color-coded cam (red for Close, Yellow for Open) until you hear the microswitch click, tightening the lock nut, and finally turning the external mechanical limit bolt back two full turns.

Motor hums or triggers stall alarm ("Err3/Err4" / Block Error)

Debris in the pipeline jams the valve disc or ball, valve stem packing is too tight, or external mechanical limit bolts are set too far inward.

We have built a real-time stall diagnosis function into the KZQ controller. When the torque is higher than the set value, the HEA actuator automatically stops the motor to avoid damage to the gears or valve stem. We suggest you use the manual handle to check the valve’s mechanical torque, remove any debris from the pipeline, and loosen the external mechanical limit bolts appropriately.

Actuator continuously hunts or oscillates around the setpoint in modulating mode

The deadband parameter “d” is set too narrow (below 0.4%); there is electrical noise in the analog signal line; or there is mechanical backlash at the valve stem connection.

In environments with severe vibration or significant electrical noise, we suggest increasing the deadband parameter “d” to 0.5%–1.5% via the menu. Additionally, we also advise using shielded twisted-pair signal cables with a single-point ground connection and ensuring there is no backlash at the valve stem connection.

Position feedback error or "Err12" displayed on KZQ controller

Potentiometer feedback wiring loose, potentiometer resistance overrun, or absolute encoder gear teeth dislocated.

We suggest checking that potentiometer terminals (0%, RV, 100%) are securely connected. When the valve is at 90° full open, use a multimeter to measure the resistance. Adjust the potentiometer drive gear so that the reading falls between 350 Ω and 600 Ω, then lock it in place.

The KZQ module displays “Err10” or “Run Range Error” during calibration.

The stroke difference between the calibrated fully closed position (uL) and the fully open position (uH) is too small (uH - uL < 150).

This safety error is designed to prevent invalid short-stroke operations. We advise manually rotating the valve to the fully closed (0°) and fully open (90°) positions to ensure a full mechanical stroke, and then re-running the one-touch automatic calibration procedure (press and hold the UP and DOWN buttons at the same time for 3 seconds).

Actuator moves to unexpected position when 4–20mA control signal is lost

The fail-safe (signal loss) parameter is configured as “Fail-Open” (I=1) or “Fail-Close” (I=3), rather than “Hold” (I=2).

Hearken Flow offers three preset fail-safe actions for control signal interruptions: Hold, Fully Open, or Fully Closed. We can preset this logic at the factory, or you can update the “I” parameter directly via the keypad menu or infrared remote control.

KZQ LCD displays "Err2" / "OverHeated Error" (Internal Over-Temperature)

The ambient temperature exceeds 80°C, the operating frequency is too high, or the internal overheating alarm threshold “t” is set too low.

Our HEA modulating actuator modules have built-in temperature sensors. If fluid temperature exceeds 65°C, we suggest installing a medium- or high-temperature mounting bracket to isolate pipe heat and ensure parameter "t" is set within 70°C–80°C.

RS485 Modbus RTU Communication Timeout or No Response

Modbus slave address conflict, baud rate mismatch, or reversed A(+) / B(-) communication polarity.

We advise verifying each HEA actuator on the RS485 loop has a unique slave address (Menu 1.6.1 / Parameter Ad), setting the master and slave baud rates to match (default 9600 bps), and verifying terminal A(+) and B(-) polarity.

Remote open and close signals are triggered at the same time ("OP&CL.SIG.ON")

The external PLC or relay logic closes the passive contacts for the remote “On” and remote “Off” signals at the same time.

When a dual-action command is received, the controller stops the motor to prevent circuit conflicts. We suggest reviewing the external PLC program and implementing electrical or software interlocks to ensure the “ON” and “OFF” signals are not activated at the same time.

Function:

On/off or modulating

Material

Housing:

Aluminum alloy, epoxy powder coated

Gear:

Steel/aluminum bronze

Screws:

Stainless steel

Indicator Cover:

Polycarbonated

Shaft/Adaptor:

Alloy steel

Seal:

NBR

Lubrication:

Aluminum-based grease

Technical Date

Power Supply:

24VDC,110VAC,220VAC

Motor:

Squirrel cage asynchronous motor

Limit Switch

SPDT,250VAC 10A, each for open and close positions

Rotation:

90° (±10°), other rotation on request

Manual Operation:

Mechanical handle standard

Conduit Entry:

2 x M18

Operating Temp:

-20°C to + 70°C

Ambient Humidity:

Max.90%RH

Vibration Tested:

XYZ10g,0.2~34Hz,30 minutes

Mounting:

ISO5211

Torque Output:

30Nm to 1000Nm (2000Nm on request)

Self-locking device:

Self-locking by worm and worm gear