General Product Characteristics

The OMK-40D Electric Actuator is a high-end quarter-turn motorized valve operator engineered by Wuhan Omkee. Integrating all the signature advantages of the OMK series, this device features a space-saving compact design, straightforward installation interfaces, premium manufacturing quality, and extreme field reliability. As a core upgraded model within the series, the OMK-40D expertly combines a continuous resistance signal with passive dry contact position switches, providing a rich, highly redundant feedback interface for modern distributed control systems (DCS) and programmable logic controllers (PLC).

Overall Dimensions and Performance Parameters

Parameter\Performance

OMK-20

OMK-40

OMK-60

DC24V

AC110V

AC220V

AC380V

DC24V

AC110V

AC220V

AC380V

DC24V

AC110V

AC220V

AC380V

Motor Power

35W

40W

40W

30W

70W

90W

90W

40W

70W

90W

90W

40W

Rated Current

3.57A

0.65A

0.37A

0.15A

5.13A

1.12A

0.57A

0.29A

5.13A

1.18A

0.60A

0.29A

Standard Time/Torque

30S/200Nm

30S/400Nm

45S/600Nm

Optional Time / Torque

15S/100Nm

6S/150Nm 15S/200Nm

60S/400Nm

Turning Angle

0~90° Adjustable

Total Weight (kg)

8.0

8.5

9.0

Cold Insulation Resistance (MΩ)

AC110V/220V/380V: 100 MΩ/500VDC

Voltage-Withstand Class

AC110V/220V: 1500VAC one minute, AC380V: 1800VAC one minute

Protection Class

Ip67

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℃

Type of Control Circuit

Type A:Ordinal switch type; Type B:Passive signal feedback type; Type C:Resistance signal feedback type; Type D:Resistance signal and passive signal feedback type; Type E: Adjusting type; Type F: With position transmitter; Type G: DC current control type; Type H: AC 380V power control type

Options of other function

★ Stainless steel support, coupling ★Direct installation board, coupling (ISO5211 Standard) ★Over torque protector ★Heater for eliminating moisture

Comprehensive Industry Applications

The OMK-40D exhibits outstanding adaptability to severe industrial environments and is widely integrated across automated process lines, including:

• Energy and Power Systems: Hydroelectric and thermal power plants, agricultural power drainage, and large-scale pumping stations.

• Process and Chemical Networks: Petroleum refining, petrochemical piping, pulp and paper processing, metallurgy, and iron/steel smelting lines.

• Life Sciences and Utilities: Pharmaceutical formulation plants, food and beverage processing, municipal water supply, and industrial wastewater treatment infrastructure.

• Marine and Infrastructures: Maritime vessel ballast systems, shipbuilding automation, and advanced Building Automation Systems (BAS) for centralized HVAC dampers and smart valve control.

Advanced Component Engineering and Structural Design

• Enclosure and Outer Shell: Fabricated from superior-grade ADC12 die-cast aluminum alloy. The housing undergoes specialized artificial aging, shot blasting, and an electrostatic powder-coating finish. The resulting plastic powder protective coat features a thickness exceeding 0.2 mm and comfortably withstands continuous ambient or media temperatures above 150 degrees Celsius, providing excellent anti-corrosion and weatherproofing properties.

• Worm Gear Transmission Assembly: The interior copper worm wheel is forged from a premium-grade aluminum bronze alloy matching precise engineering ratios and machined to tight dimensional tolerances. The output shaft and drive worm are constructed from 40Cr alloy steel, subjected to induction heat treatment, and finished with a black oxide rust-prevention process. The output shaft and worm wheel are connected through a highly dependable internal spline mechanism, solving the structural vulnerabilities of typical one-piece designs which frequently warp or break under peak torque loads.

• Reduction Gearbox Module: All interior reduction gears are precision-machined from high-quality quenched and tempered steel. They deliver high geometric accuracy, exceptional tooth strength, ultra-low operating noise, superior fatigue resistance, and minimal friction wear. Both ends of the reduction gear train are firmly anchored using high-precision deep-groove ball bearings to dampen vibrations and absorb intense shock loads over prolonged operations. The gear casing is cast from high-strength ADC12 aluminum alloy, guaranteeing stable and seamless power transmission.

• Heavy-Duty Electric Motor: To cope with complex industrial fields and continuous regulation requirements, the internal motors are custom-built with a torque safety factor designed at 1.3 to 1.5 times the rated nominal torque. Crucial parameters—such as internal temperature rise, rotational inertia, and insulation strength—undergo specialized optimization and exhaustive laboratory cycle testing. This guarantees that the actuator can execute high-frequency start-stop cycles under full-load or momentary overload conditions without thermal tripping.

• P6 Precision Bearings: All internal bearings feature small clearances, minimal running noise, and high running accuracy, conforming strictly to the premium low-noise EMQ (ZV2) standard with a P6 precision grade rating. This ultra-smooth performance is sustained through extreme control over the surface roughness of both the raceways and balls, ensuring perfect roundness and structural cage balance.

• Proprietary Stroke Control System: The OMK-40D utilizes an exclusive, in-house developed stroke control mechanism. Users can easily calibrate the travel limit switches by using the top-mounted mechanical adjustment shaft. This design simplifies on-site commissioning, significantly reducing setup time while maintaining highly precise valve positioning.

• Premium Oil Seals and O-Rings: Fully equipped with high-grade imported double-layered skeleton TC oil seals and premium rubber sealing rings manufactured by the renowned German brand Oubosu, ensuring an absolute barrier against lubricant leakage and fluid ingress.

• Industrial Lubrication: The gear assemblies are pre-lubricated for life using top-tier imported Mobil brand specialized synthetic lubricants, guaranteeing smooth mechanical efficiency across wide temperature swings.

• Advanced Dual Feedback System (Potentiometer and Passive Switches): As the core component of the D-type feedback variant, the OMK-40D integrates two independent signal monitoring mechanisms:

  • Continuous Potentiometer Feedback: Features an integrated "SAKAE" conductive plastic potentiometer imported directly from Japan, ensuring outstanding measurement linearity and an extended operational life cycle. It has a total resistance value of approximately 0 to 1000 Ohms (or 500 Ohms), a total resistance tolerance of plus or minus 15 percent, an independent linearity of L plus or minus 0.5 percent, a mechanical travel of 360 degrees continuous, and an electrical travel of 355 plus or minus 5 degrees. The assembly incorporates a unique spring-loaded backlash elimination mechanism to effectively cancel out gear transmission clearances, minimizing actuator hysteresis and facilitating continuous real-time valve position sampling.

  • Passive Dry Contact Position Signaling: Working alongside the continuous potentiometer feedback, the internal circuit includes a dedicated set of independent microswitches. These switches output a separate group of passive dry contact signals corresponding precisely to the fully open and fully closed target end-positions, ensuring high-safety operational monitoring.

Design, Machining, and Comprehensive Quality Assurance

• Engineering and Simulation: Every individual component of the OMK series actuator is designed by specialized engineers with more than 10 years of professional experience in industrial valve automation. Designs are derived from meticulous mathematical theories and empirical analyses of diverse field challenges. Detailed 2D blueprints and comprehensive 3D solid parts models are generated and verified via advanced Unigraphics (UG) CAD/CAM software simulations prior to mold manufacturing and die-casting tool fabrication.

• Precision CNC Machining: The precision machining phase utilizes imported high-accuracy 4-axis CNC machining centers paired with high-efficiency pneumatic fixtures to maximize consistency. Following the machining process, all parts are measured via advanced Coordinate Measuring Machines (CMM) to verify that all critical dimensions, concentricity, and tolerances line up perfectly with design specifications.

• Rigid Testing and Inspection Protocols: Product assembly strictly follows the standardized Product Assembly Operation Instruction Manual. Every single assembled OMK-40D actuator must pass a strict testing routine consisting of four individual testing stages and a final overarching QA inspection before being approved for factory release:

  1. Torque Calibration Test: Each completed actuator undergoes automated torque testing under both nominal voltage and lower-bound negative voltage levels. This test checks whether the unit consistently achieves its specified 1.3 times rated torque safety margin.

  2. Dielectric Voltage-Withstand (Hi-Pot) Test: Every unit is subjected to high-voltage insulation verification. A potential of 1500V AC is applied sequentially to any one of the three motor power leads for 1 continuous minute. To pass, the internal wiring insulation must show zero dielectric breakdown or leakage current spikes.

  3. Continuous Load Sample Testing: Mass-production batches undergo random sampling for prolonged load testing. Selected units are run under full-load conditions for 48 consecutive hours to confirm structural and electrical endurance.

  4. Submersible Hermetic Seal Test: Every individual actuator is subjected to a final immersion seal test. Dry air at a pressure of 0.2 MPa is introduced into the housing cavity via the waterproof cable entry gland, and the unit is fully submerged in a water tank for 1 minute. A total absence of air bubbles confirms the integrity of the shell and seals.

  5. Final Quality Control Audit: Upon passing the above trials, certified quality inspectors conduct a comprehensive final check on each actuator before signing off on its factory compliance certificate.