The OMK-40F Electric Actuator is a specialized motorized valve operator engineered by Wuhan Omkee. Integrating all the foundational benefits of the OMK range—including a space-saving compact design, highly convenient installation interfaces, premium manufacturing quality, and robust field reliability—the OMK-40F stands out due to its advanced integrated position transmitter. This model is custom-built for automated industrial systems that require standard current signals (such as 4-20mA) to achieve high-precision continuous feedback of valve displacement under switching control loops.

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 Industrial Applications

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

• Energy and Power Infrastructure: Fluid flow monitoring in hydroelectric and thermal power plants, and automated power drainage or irrigation networks.

• Heavy Chemical and Process Pipelines: Refining processes, chemical piping loops, paper and pulp mass processing, metallurgy, and iron/steel smelting facilities.

• Utilities and Environmental Plants: Large-scale water purification systems, municipal wastewater processing, and desalination installations.

• Hygienic and Specialized Equipment: Pharmaceutical batching, automated food and beverage processing, and commercial marine engineering systems.

• Climate and Facility Automation: High-demand Building Automation Systems (BAS) for smart HVAC dampers and industrial central valve monitoring.

Premium Component Engineering and Material Characteristics

• 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-40F 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.

• High-Accuracy Feedback Potentiometer Assembly: The internal tracking core incorporates a Japan-imported "SAKAE" conductive plastic potentiometer. It offers high precision and an extended lifespan with a resistance value of roughly 0 to 1000 Ohms, a total resistance tolerance of plus or minus 15 percent, independent linearity of L plus or minus 0.5 percent, mechanical travel of 360 degrees, and an electrical travel of 355 plus or minus 5 degrees. The integration of a spring-loaded backlash elimination mechanism eliminates gear mesh play, minimizing hysteresis and allowing for real-time continuous position sampling.

Advanced Position Transmitter Principles

The core feedback capability of the OMK-40F is governed by a high-performance position transmitter that features the following operational characteristics:

1. Current Absorption Circuitry: The output terminal of the position transmitter is designed with a specialized current absorption circuit, which significantly simplifies the adjustment of the current zero point. It is highly flexible and fully compatible with both 4-20mA and 0-10mA current signal standards.

2. Displacement Amplification System: The transmitter features an exposed sensor rod that generates micro-displacements when subjected to physical travel pressure. Inside the transmitter, an integrated mechanical-electronic displacement amplification device magnifies the movement of the capacitor plates several times over. This allows for high-precision, sub-millimeter measurements of small valve strokes within a 10mm range.

3. Mechanical Zero-Adjustment Mechanism: The tail section of the sensor rod is equipped with a mechanical zero-point adjustment device, offering a modification range that spans several times the effective travel length. This design completely overcomes the accuracy degradation issues that typically plague multi-electrode capacitive transmitters when zero-point migration is excessively large.

Engineering, Production, and Quality Management

• Simulated Development: Every component of the OMK-40F is drafted by a senior engineering department with more than 10 years of specific valve automation experience. Designs incorporate empirical solutions to real-world plant problems. Complete 2D construction drawings and 3D solid parts models are generated and simulated under kinetic environments using Unigraphics (UG) software before any mold building or casting processes begin.

• Precision Center 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.

• Rigorous Testing Routines: Product assembly strictly follows the standardized Product Assembly Operation Instruction Manual. Every single assembled OMK-40F 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 10 continuous minutes. A total absence of air bubbles confirms the absolute 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.