Name: HUM Industrial Quarter-Turn Electric Actuator for Ball & Butterfly Valves
Brand: HEARKEN
SKU: 00051
Rating: 4.9 (76 reviews)

Description of Hearken HUM Series Quarter-turn Electric Actuator

Hearken Flow HUM series electric quarter-turn actuators operate ball, butterfly, and plug valves across a torque range of 7 Nm to 150 Nm. ISO 5211 mounting for faster installation and easier valve replacement. The HUM series 1/4 turn electric actuator can help you reduce stock complexity and build compact, bracket-free actuated valve packages. We provide custom branding, special wiring, and stem machining to match your market requirements.

Top-down view of Hearken Flow HUM-1 electric quarter-turn actuators lined up on factory assembly workbench

Front view of Hearken Flow HUM-1 electric actuator showing technical nameplate and wiring diagram

atch production of Hearken Flow HUM-1 DC24V electric actuators ready for export in factory workshop

Technical Specifications of HUM Series Quarter Turn Electric Actuators

Model	Voltage	Current	Rated Power	Switching Speed (0~90°)	Output Torque (Nm)	Max Stroke	Output Connection Size	Manual Mode	Provides output adapter sleeve
HUMS	AC220V(50Hz)	30mA	6W	25s	15	0~360°	□14x18mm F03/F05	N/A	□14x11, □14x9
HUMS	AC110V(50Hz)	35mA	6W	25s	15	0~360°	□14x18mm F03/F05	N/A	□14x11, □14x9
HUMS	DC24V	20mA	6W	25s	15	0~360°	□14x18mm F03/F05	N/A	□14x11, □14x9
HUM-1	AC220V(50Hz)	0.25A	15W	12s	35	0~360°	□14x18mm F03/F05	8mm Square Output Shaft at the bottom	□14x11, □14x9
HUM-1	AC220V(50Hz)	0.25A	15W	2.5s	15	0~360°
HUM-1	AC220V(50Hz)	0.25A	15W	1s	7	0~360°
HUM-1	DC24V	0.5A	18W	10s	35	0~360°
HUM-1	DC24V	0.5A	18W	2.5s	15	0~360°
HUM-1	DC24V	0.5A	18W	1s	7	0~360°
HUM1S	AC220V(50Hz)	0.25A	15W	12s	50	0~360°	□14x18mm F03/F04/F05	8mm Square Output Shaft at the bottom	□14x11, □14x9
HUM1S	AC220V(50Hz)	0.25A	15W	2.5s	15	0~360°
HUM1S	AC220V(50Hz)	0.25A	15W	1s	7	0~360°
HUM1S	DC24V	0.5A	18W	10s	50	0~360°
HUM1S	DC24V	0.5A	18W	2.5s	15	0~360°
HUM1S	DC24V	0.5A	18W	2.5s	7	0~360°
HUM-3	AC220V(50Hz)	0.45A	25W	8s	150	0~360°	□17x20mm F07	8mm Square Output Shaft at the bottom	□17x14
HUM-3	AC220V(50Hz)	0.45A	25W	1s	35	0~360°
HUM-3	AC380V(50Hz)	0.25A	30W	8s	160	0~360°
HUM-3	AC380V(50Hz)	0.25A	30W	1s	45	0~360°
HUM-3	DC24V	0.3A	30W	8s	150	0~360°
HUM-3	DC24V	0.3A	30W	1s	45	0~360°

Technical Features of Quarter Turn Electric Actuator

Feature & Specification	Engineering & Application Advantage
Certifications & Compliance	CE, RoHS, ISO 9001, SIL 3 Certified. Fully compliant with international safety and quality standards for automated valve packages.
Flange Mount Standard HUMS through HUM-3-1 connects directly to ISO 5211 valves. Custom adaptation kits available for non-standard stems or high-temperature steam lines.	Mounts directly onto standard valve top flanges without external brackets, reducing assembly labor and mounting space. Mounting kits adapt HUM actuators to non-standard or severe-service valves.
Rated Output Torque 7 Nm to 150 Nm	Covers small to medium quarter-turn valve sizes with standardized body dimensions, allowing broad valve compatibility across fewer actuator models.
Motor Technology Hearken Flow HUM Series quarter-turn electric actuators use a brushless DC (BLDC) design rated for 100% continuous duty cycle, low power draw, Class F insulation, and built-in thermal overload protection.	Supports continuous operation without overheating or thermal shutdown under heavy modulation cycles. Low power draw reduces operating energy costs and extends motor service life.
Corrosion-Resistant Enclosure IP67 rated waterproof/dustproof. Standard Nylon housing resists heat, acid, and alkali. Heavy-duty Aluminum alloy housing optional.	Seals internal electrical components against moisture, chemical vapor, and outdoor exposure for reliable operation in industrial environments.
Dual Position Feedback Mechanical dome position indicator on the top cover. Wires directly to the control box to output open/close position signals.	Top visual dome provides clear local position checking, while internal limit switches output electrical signals for PLC integration and remote monitoring.
Emergency Manual Override Integrated manual override device for power outages. Operates via handwheel or wrench without special tools.	Allows manual valve operation during power cuts via handwheel or wrench to maintain process safety.
Anti-Condensation Space Heater (Optional) Internal thermostat-controlled heating element avoids moisture condensation inside the housing.	Avoids internal condensation during severe ambient temperature fluctuations, protecting sensitive electrical circuits in outdoor or high-humidity installations.
Operating Environment Ambient temperature range: -10°C to 60°C. Ambient humidity range: 30% to 95% RH. Supports 24V DC, 110V/220V AC. Custom wiring and stem machining available.	Suitable for standard indoor, outdoor, and high-humidity industrial field installations.
Customization Custom private labeling and stem machining available.	We provide custom nameplates, tailored wiring diagrams, and stem machining for OEM integration.
Factory Warranty	18-Month Warranty from shipment date, backed by 100% factory torque, pressure, and insulation testing.

Need Help Selecting the Right Control Type? Send us your control system requirements. Request Control Selection Advice →

Automate Small-to-Medium Valves with Hearken Flow

If you assemble electric-actuated valves or supply stocking distributors, our HUM series quarter-turn electric actuators can be direct-mounted straight onto your valves.

Standardized Mounting for Compact Valves (DN6 to DN125 / 1/8" to 5")	High-Temperature & Steam Line Options (Up to 180°C)	Precision Stem Socket Machining
From 1/8" UPVC ball valves up to 5" flanged butterfly valves, HUM series electric actuators mount directly onto standard ISO 5211 top flanges (F03 through F07). You do not need extra brackets, which keeps your stock simple.	For high-temperature water, steam, or thermal oil lines, we add thermal isolation brackets to block heat transfer. Internal electronics stay cool and safe from high heat.	We can machine stem sockets (9×9 mm, 11×11 mm, 14×14 mm, or custom Double-D/Keyway shapes) to match your valve stem seamlessly.

Commercial Terms & Flexible OEM Supply:

Standard Sample Lead Time: 3 – 5 business days for standard voltage and mounting configurations.
OEM & Private Labeling: Low MOQ for custom nameplates, tailored wiring, and custom stem machining (Contact us for OEM quantity).
Warranty Guarantee: 18-month direct factory warranty with lifetime technical support.

Need a Factory Quote?

Share your required torque, voltage, operating pressure, and valve stem dimensions with us at [email protected]. We will calculate the safety margins and send you direct factory pricing.

Applications of HUM Series Quarter Turn Electric Valve Actuator

Hearken Flow HUM series electric actuators are used across different industrial liquid, gas, and automated equipment systems:

Water Treatment & RO Plants
Boilers, Chillers & HVAC Systems
LPG & Fuel Lines
OEM Machinery & Electrical Equipment
Chemical & Industrial Processing

Hearken Flow HUM Series Intelligent Diagnostics & Debugging Guide

We provide on-site button control, menu parameter configurations, and error code diagnostics for the HUM intelligent control board.

1. Digital Display Fault Code Diagnostics

When powered on, the HUM control board displays KLKJ during initialization before entering normal operation. If an anomaly occurs, the LED screen displays one of the following fault codes:

F-oF — Valve Position Feedback Disconnection
- Probable Cause: Internal position feedback potentiometer wire is disconnected, loose, or damaged.
- Action: Inspect internal potentiometer wiring connections to the control board and verify signal continuity.
L-oF — Analog Control Input Signal Loss
- Probable Cause: Incoming 4–20mA analog control signal is missing, interrupted, or out of normal current range.
- Action: Inspect control signal input loop wiring, verify PLC/DCS output status, and measure signal current at the input terminals.
Lock — Motor Stall / Rotor Lock
- Probable Cause: Motor is stalled due to valve seat obstruction, excessive differential pressure, or mechanical stem binding.
- Action: Disconnect main power immediately. Check valve seat for foreign debris, test stem movement using manual override, and verify line pressure.
L-UP — Forward Over-Torque (Opening Stroke)
- Probable Cause: Actuator encountered excessive mechanical resistance or over-torque condition during the opening stroke in switch control mode.
- Action: Check valve opening stroke for mechanical binding and inspect opening travel limit switch settings.
L-do — Reverse Over-Torque (Closing Stroke)
- Probable Cause: Actuator encountered excessive mechanical resistance or hard seat binding during the closing stroke in switch control mode.
- Action: Clean valve seat sealing faces, inspect closing travel limit switch settings, and recalibrate zero-point position.

2. Control Panel Button Functions

UP Key:
- Manual Mode: Controls actuator forward rotation.
- Auto Mode: Toggles LED digital display (control signal vs. valve position signal).
- Parameter Mode: Navigates menu items upward. Combined with A/M, cancels parameter edits and moves up one menu level.
DO Key:
- Manual Mode: Controls actuator reverse rotation.
- Auto Mode: Press & hold for ~3 seconds to access Parameter Setting menu.
- Parameter Mode: Combined with A/M, confirms parameter settings and moves down one menu level.
A/M Key:
- Operation: Toggles between Automatic (Auto) and Manual (Manual) operating modes.
- Parameter Mode: Shifts decimal point position during parameter setup.
SET Key:
- Calibration: Combined with UP / DO, sets zero-point (0%) and full-scale (100%) mechanical limits; combined with A/M, calibrates the input control signal.

3. Intelligent Control Board Menu Parameters

To access the configuration menu, press and hold the DO button for 3 seconds:

Prompt Code	Default Value	Parameter Function & Description
dFh	1.0	Sensitivity Setting: Adjusts actuator response sensitivity (Range: 0.1% to 25.0%).
In	4-20	Control Mode Selection: • 4-20: Analog control mode (4–20mA proportional signal) • do: Switch (On/Off) control mode • PU: Two-dimensional control mode
0-99	OFF	Feedback Signal Reversal: Switches valve position feedback signal direction (0% to 100% or 100% to 0%).
dFch	OFF	Auto Rotation Direction: Automatically identifies and adjusts forward/reverse rotation direction.
End	593	Chip Version: Displays board firmware version (select to exit parameter setup).

Ready to Get Direct Factory Pricing? Send us your required torque, voltage, and quantity Submit RFQ for Factory Direct Pricing →

Wiring Diagram & Terminal Definition (AC220V On-Off Type)

Standard AC220V Terminal Definitions
Terminal No.	Function	Wiring Logic & Operation
1 & 3	Open Valve	Connect 1 to AC Line (L), 3 to AC Neutral (N) to drive valve open.
1 & 4	Close Valve	Connect 1 to AC Line (L), 4 to AC Neutral (N) to drive valve close.
5	Active Open Feedback	Outputs AC220V N signal when valve reaches fully open position.
6	Active Close Feedback	Outputs AC220V N signal when valve reaches fully closed position.
G	Grounding	Connect to system safety earth ground.
LS3 (C / NO / NC)	Dry Contact Open Feedback	Passive Limit Switch: C-NO closes and C-NC opens when fully open.
LS4 (C / NO / NC)	Dry Contact Close Feedback	Passive Limit Switch: C-NO closes and C-NC opens when fully closed.
Optional Space Heater Wiring (Terminals 7 & 8) Heater Operation: Connect AC220V (L/N) to Terminals 7 and 8 to activate the internal anti-condensation heater. Disconnect power to stop heating.

Wiring Diagram & Terminal Definition (DC24V On-Off Type)

Standard DC24V Terminal Definitions
Terminal No.	Function	Wiring Logic & Operation
1	Power (+)	Connect to DC24V Positive (+).
2 & 3	Open Valve Control	Connect 1 to DC24V (+), 2 & 3 to DC24V (-) to drive valve open.
2	Close Valve Control	Connect 1 to DC24V (+), 2 to DC24V (-) to drive valve close.
4	Active Open Feedback	Outputs DC24V (+) signal when valve reaches fully open position.
5	Active Close Feedback	Outputs DC24V (+) signal when valve reaches fully closed position.
G	Grounding	Connect to system safety earth ground.
C1 (NO1 / NC1 / C1)	Dry Contact Open Feedback	Passive Contact: C1-NO1 closes and C1-NC1 opens when fully open.
C2 (NO2 / NC2 / C2)	Dry Contact Close Feedback	Passive Contact: C2-NO2 closes and C2-NC2 opens when fully closed.
Optional Space Heater Wiring Heater Operation: Connect DC24V (+/-) directly to the dedicated heater supply ports to activate the anti-condensation element.

Modulating Type (4–20mA Proportional Control)

Modulating Type (4–20mA Proportional Control)
Terminal / Port	Signal Type	Wiring & Function
Power (L / N)	Main Supply	Connect main AC power supply corresponding to module voltage rating.
IN (4–20mA + / -)	Control Input	Receives 4–20mA analog control signal from PLC/DCS to modulate valve position.
OUT (4–20mA + / -)	Position Feedback	Outputs continuous 4–20mA analog signal representing real-time valve opening %.
S5 & S6	Dry Contact Open	Passive Contact: Closes when valve reaches 100% open position.
S3 & S4	Dry Contact Close	Passive Contact: Closes when valve reaches 100% closed position.
S1 & S2	Fault Alarm Contact	Passive Contact: Closes upon system fault or drive alarm condition.

How to Select the Right HUM Series Quarter Turn Electric Actuator

Hearken Flow HUM series electric quarter-turn actuator sizing depends on five parameters:

Step 1: Calculate Required Torque & Safety Margin

The output torque of the Hearken HUM Series electric quarter-turn actuator needs to be higher than the valve's peak breakaway torque under maximum working pressure. Standard selection applies a safety factor based on required torque:

Torque Safety Factor Reference

Valve Operating Torque	Recommended Safety Factor	Required Actuator Output Formula
Up to 98 Nm	1.5 (+50% margin)	Valve Torque × 1.5
Over 98 Nm	1.3 (+30% margin)	Valve Torque × 1.3

*Note: Recommended safety factors apply to standard ball valves handling clean liquids or gases at ambient temperatures. Applications involving slurry, high-viscosity fluids, or high-temperature steam typically require an expanded safety factor of 1.8 to 2.0 due to increased friction over time.

Sizing Calculation Examples

Example A (Small/Medium Valve): Valve breakaway torque is 60 Nm (under 98 Nm).
- Calculation: 60 Nm × 1.5 = 90 Nm
- Selection: Choose a Hearken Flow HUM model electric actuator rated at 90 Nm or higher.
Example B (Large Valve): Valve breakaway torque is 200 Nm (over 98 Nm).
- Calculation: 200 Nm × 1.3 = 260 Nm
- Selection: Choose a Hearken Flow HUM model electric actuator rated at 260 Nm or higher.

Need engineer verification for your valve torque? Share your parameters for confirmation. Verify Torque →

Step 2: Power Supply Selection

Hearken Flow HUM series quarter-turn electric actuators integrate with standard industrial electrical systems across common AC and DC voltage configurations:

AC Voltage: 220V AC / 110V AC (50/60 Hz)
DC Voltage: 24V DC

Step 3: Control Mode Selection

Control specifications depend on whether your system requires basic two-position isolation or continuous flow modulation:

ON/OFF Type: Two-position isolation (fully open / fully closed) via internal limit switches.
Modulating Type: Continuous proportional position control via standard 4-20mA or 0-10V DC input/output signals.
Fast-Acting Type (Quick Open/Close): High-speed operation for 10 Nm to 50 Nm models, featuring a 100% continuous duty cycle for frequent, rapid valve switching without overheating.
Supercapacitor Failsafe (Power Backup): Built-in supercapacitor energy storage automatically drives the actuator to a preset fail-safe position (Fail-Close or Fail-Open) upon main power failure—providing maintenance-free emergency shutdown without battery degradation.
Modbus RS485 Communication: Integrated RS485 interface supporting Modbus-RTU protocol for multi-drop industrial network integration.

Step 4: Mechanical Mounting (ISO 5211)

Direct mounting compatibility depends on top flange and drive stem dimensions:

Flange Standard: ISO 5211 standard (e.g., F03 / F05 / F07 / F10)
Drive Stem: Double D, Square, or Keyway stem connection options

Need 2D/3D CAD models or custom stem sleeve machining? Download drawings or submit your dimensions. Download CAD / Specs →

Step 5: Environmental & Enclosure

Enclosure ratings and internal accessories depend on site conditions:

Protection Rating: Standard IP67 weather-proof
Available Options: Internal space heater (anti-condensation)

Need to select the Right Model for Your Valve?

Send your valve specifications or datasheet to Hearken Flow at [email protected] for a fast, accurate sizing recommendation.

Cross-Reference Guide: Direct Equivalent & Drop-In Alternative for UNID (MIT-UNID-CNS) UM Series Electric Actuators

This guide offers the best cross reference from UNID (MIT-UNID-CNS)’s UM series electric actuators to a Hearken Flow equivalent HUM series. You may need to add options to the Hearken Flow HUM series to match UNID (MIT-UNID-CNS)'s options. If you need assistance with UM Series model cross reference, please contact Hearken Flow Customer Service at Email [email protected].

UNID to Hearken Flow Cross-Reference Table

UNID Model (MIT-UNID-CNS)	Hearken Flow HUM Alternative	Output Torque	ISO 5211 Mount	Standard Voltages
UMS	HUMS	15 Nm	F03 / F05	DC24V, AC110V, AC220V
UM-1	HUM-1	35 Nm	F03 / F05	DC24V, AC110V, AC220V
UM-1S	HUM-2	50 Nm	F03 / F04 / F05	DC24V, AC110V, AC220V
UM-3	HUM-3	150 Nm	F07	DC24V, AC110V, AC220V
UM-3-1	HUM-3-1	150 Nm	F07	DC24V, AC110V, AC220V

Advantages for Alternative Orders

No Bracket Adjustments: Same ISO 5211 bolt pattern and stem sockets—mounts directly onto your existing setup without changing brackets.
In-House Stem Machining: We machine the inner square or double-D drive socket in our factory to match your valve stem dimensions.

Disclaimer: UNID and MIT-UNID-CNS are trademarks of their respective owners. Hearken Flow is an independent manufacturer. UNID model numbers (UMS, UM-1, UM-1S, UM-3) are used solely for cross-reference and dimensional comparison.

FAQs of HUM Series Quarter Turn Electric Actuators

Q1: Do Hearken Flow HUM series electric actuators support fail-safe (power backup) operation?

A: Yes. Emergency fail-safe automatic return is available utilizing an integrated supercapacitor energy storage module, which automatically drives the valve to a preset safety position (Fail-Close or Fail-Open) upon power outage.

Q2: Can HUM electric actuators operate at a 100% continuous duty cycle?

A: Yes. Customized HUM models can be engineered for 100% continuous duty cycle operation, running continuously without overheating or thermal overload.

Q3: How do I operate the HUM electric actuator manually during a power failure?

A: All HUM actuators are designed with an integrated manual override clutch mechanism. Manual positioning is operated via the square drive shaft at the bottom of the housing using standard external wrenches or socket tools.

Q4: What is the difference between HUM-1 and HUM-1S models?

A: HUM-1 provides an output torque of 35 Nm with a lightweight, high-strength Nylon enclosure. HUM-1S provides 50 Nm of torque with a heavy-duty Aluminum alloy enclosure for demanding site conditions.

Q5: Does the optional anti-condensation space heater share the same power terminal with the main actuator?

A: No. The internal space heater requires an independent power supply wired directly to its dedicated terminals.

Q6: How does the anti-condensation space heater operate when the valve is closed?

A: The heater remains continuously energized as long as its independent power circuit is active. This ensures round-the-clock moisture prevention inside the enclosure, regardless of whether the valve is open or closed.

Q7: Are 24V DC and 220V AC voltage options priced differently?

A: No. Standard 24V DC and 220V AC voltage configurations carry the same standard factory pricing.

Q8: Can the bottom drive stem socket be customized (e.g., to 11×11 mm)?

A: Yes. We can supply reduction sleeves/adapters for standard socket sizes, or directly machine custom square/double-D stem sockets in our factory for volume orders.

Q9: Do HUM electric actuators ship with standard Hearken Flow branding or unbranded private labels?

A: We offer flexible OEM branding options, including unbranded (neutral) nameplates or custom private-label branding tailored for distributors and valve manufacturers.

Q10: What certifications does the HUM series hold, and is it explosion-proof?

A: The HUM series is certified to CE, RoHS, ISO 9001, and SIL 3 standards, with an IP67 weatherproof enclosure.

Q11: What is your standard lead time and minimum order quantity (MOQ) for OEM orders?

A: Standard sample orders ship within 3 to 5 business days. For custom private-labeling, specific stem machining, or OEM wiring, we offer flexible low-MOQ options. All HUM actuators are covered by an 18-month factory warranty.

HUM Industrial Quarter-Turn Electric Actuator for Ball & Butterfly Valves

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