Name: OMK-Ex05H Flameproof Part-Turn Electric Actuator (50 Nm / 3-Phase AC Control)
SKU: imSj-pQUTJuugfzk0gPf-Q

OMK-Ex05H Flameproof Part-Turn Electric Actuator (50 Nm / 3-Phase AC Control)

The OMK-Ex05H is a robust, high-efficiency flameproof part-turn electric actuator designed and manufactured by OMKEE. Engineered specifically for 3-Phase AC 380V power systems, this model is optimized for industrial sectors where high-power efficiency and balanced three-phase load distribution are required for valve and damper automation.

Product Information

Brand:

OMKEE

Model number:

OMK-Ex05H

Standard Torque/Speed:

20S/50Nm

Control Voltage:

AC380V

Explosion-Proof Rating:

Ex db IIB T4 GB

3-Phase Control Logic & Passive Feedback Architecture

The OMK-Ex05H is tailored for large-scale industrial infrastructure where 3-phase power is the standard for plant-wide motor control:

Phase-Reversal Commutation: Directional control is achieved through an external phase-reversing circuit. By swapping two phases of the 3-phase AC 380V supply, the actuator reverses the motor's rotation to perform opening or closing operations.
Passive Dry Contact Integration: The feedback circuit is electrically decoupled from the high-voltage motor supply. When the valve completes its $90^\circ$ travel, the mechanical limit cam trips a set of dry contacts. This provides a clean, unpowered confirmation signal to the plant's PLC or DCS, shielding sensitive control hardware from 380V surges.

Overall Dimensions and Performance Parameters

Performance Parameters Type Power	OMK-Ex05
	DC24V	AC24V	AC110V	AC380V	AC220V
Motor Power	13W	10W	10W	6W	10W
Rated Current	1.28A	1.50A	0.24A	0.07A	0.15A
Standard Time/Torque	20S/50Nm
Optional Time/Torque	4S/20Nm 10S/30Nm				4S/20Nm 10S/30Nm 60S/50Nm
Turning Angle	0 ~ 360° Adjustable
Available Control Circuit	Types of A、B、C、D、E、F、G、H
Total Weight	3.0kg
Insulating Resistance	DC24V/AC24V：100MΩ/250VDC AC110V/AC220V/AC380V：100 MΩ/500VDC
Withstand Voltage Class	DC24V/AC24V：500VAC 1minutes、AC110V/AC220V:1500VAC 1minutes、AC380V:1800VAC 1minutes
Protection Class	IP67
Explosive-proof grade	Exd Ⅱ BT4Gb
Installation Angle	360° at any angle
Electric Interface	One G1/2 Water-proof Cable Connector（For types with 4-20mA DC, etc. control signals , add one more）
Ambient Temperature	-30℃ ~+60℃
Optional Function	◆Heater for eliminating moisture

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Core Engineering & Durability Features

1. Flameproof ADC12 Aluminum Enclosure

The internal components are housed within a premium ADC12 aluminum alloy flameproof chamber. The enclosure undergoes artificial thermal aging, shot-blasting, and is finished with a thermo-sprayed outdoor powder coating thicker than 0.2 mm. This finish resists heat up to 150°C and protects against corrosive gases common in petrochemical environments.

2. High-Efficiency Motor & Spline Transmission

Torque Reserve: The 3-phase motor is designed with a 1.3x to 1.5x torque safety reserve, ensuring consistent breakaway force even under high friction loads or pressure transients within process pipes.
Spline-Joint Integrity: The gear train utilizes a high-performance aluminum bronze worm wheel and a 40Cr alloy steel worm shaft (black-oxide treated). To prevent structural failure, the output shaft connects to the worm wheel via a spline joint, providing superior stress distribution compared to traditional one-piece shaft designs.

3. Precision Gearbox & EMQ P6 Bearings

All internal reduction gears are precision-machined from quenched and tempered steel, known for high fatigue strength and wear resistance. Every gear shaft is supported by P6-grade deep-groove ball bearings meeting the EMQ (ZV2) standard, which minimizes vibration and noise while ensuring the actuator can handle long-term shock loads.

4. Imported Sealing and Lubrication

To guarantee a maintenance-free, leak-proof lifespan:

Lubrication: Internal gears are lubricated with high-grade imported Mobil synthetic grease.
Sealing: The unit is protected by dual-lipped skeleton TC oil seals from the German brand Oubaisi, preventing grease leakage and sealing the enclosure against environmental contaminants.

Manufacturing & Quality Assurance (FAT)

Every OMK-Ex05H is manufactured through a closed-loop system: 2D/3D parts are modeled using UG software for predictive stress analysis, machined on high-precision 4-axis CNC centers, and verified by Coordinate Measuring Machines (CMM) to ensure design tolerance compliance.

Pre-Shipment Inspection Protocol

1.1.3x Torque Test：Under-Voltage Margin Verification。

Every unit is tested under rated and negative voltage conditions to verify a minimum 1.3x safety margin in output torque.

2.Insulation Integrity Test：1500V High-Voltage Dielectric Test。

The motor phases are subjected to 1500V high-voltage stress for 1 minute to confirm zero insulation breakdown.

3.Thermal Endurance Test：48-Hour Continuous Operational Load。

Random batch samples are run continuously under full-load conditions for 48 hours to confirm mechanical durability and thermal stability.

4.10-Minute Submersion/IP68 Test：0.2 MPa Pressure Retention Test。

Each unit is pressurized to 0.2 MPa while submerged. Zero bubble emission for 10 minutes is required to certify enclosure integrity.

Global Compliance and Applications

The OMK-Ex05H conforms to the JB/T8219-1999 standard for industrial actuators and holds certifications from the Shanghai Institute of Process Automation Instrumentation (Report No. C16040-WT). The manufacturing process adheres to ISO 9001:2008 and carries the CE mark, ensuring readiness for international trade and installation.

Typical Use Cases:

Energy Infrastructure: Large-scale coal-fired or hydroelectric power generation plant fuel control and water bypass systems.
Heavy Industry: Steel processing, blast furnace air flow control, and large-scale metallurgical ventilation dampers.
Large-Scale Processing: Industrial water treatment plants, chemical process distribution hubs, and automated paper manufacturing lines.
Marine & Shipbuilding: Ballast water management and large-scale deck piping flow control.

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