OMK-250F Part-Turn Electric Actuator (2500Nm / Transmitter Feedback Type)

Precision Position Transmitter Technology

The OMK-250F is distinguished by its advanced position transmitter, which converts mechanical valve movement into a reliable industrial-standard current loop:

• High-Precision Displacement Amplification: The transmitter features an exposed plunger that detects internal movement. An internal displacement amplification mechanism magnifies the plate movement, allowing the device to perform high-precision measurements even for small strokes (within 10mm).

• Flexible Current-Loop Output: The circuit is designed to sink current, making it highly versatile for integration with different control logic boards. It supports both 4-20mA and 0-10mA standards.

• Mechanical Zeroing: The plunger tail is equipped with a precision mechanical zero-adjuster. This allows users to fine-tune the zero-point across a wide range, effectively overcoming the precision degradation issues commonly found in multi-electrode capacitive transmitters when zero-point migration occurs.

Key Component Features & Material Engineering

1. Ultra-Protected ADC12 Aluminum Enclosure

Built to survive the most punishing outdoor processing environments, the shell is constructed from premium ADC12 die-cast aluminum. The raw casting undergoes an extensive surface treatment regimen: artificial aging, shot-blasting, liquid impregnation, and surface oxidation.

It is finished with a premium thermo-sprayed AkzoNobel powder coating thicker than 0.2 mm that safely withstands temperatures above 150°C, preventing peeling, blistering, or corrosion under aggressive chemical vapors or continuous outdoor weathering.

2. High-Torque Motor with 1.5x Safety Reserve

To handle erratic pipeline loads, OMKEE motors feature a 1.3x to 1.5x torque safety reserve. Crucial parameters—including motor temperature rise, rotational inertia, and insulation wear—undergo strict empirical testing. This ensures the actuator can handle frequent start-stop full loads without stalling under peak pipeline stresses.

3. Spline Joint and Forged Worm Gear Drive

Managing 2500 Nm of torque requires an uncompromised drive joint. The internal worm wheel is forged from a high-performance aluminum bronze alloy, matched with a 40Cr alloy steel worm shaft that has undergone thermal tempering and black-oxide anti-rust plating.

Instead of fragile, cheap one-piece structures that shear under intense rotational shocks, the OMK-250F uses a robust spline connection to lock the output shaft and the worm gear together. This setup spreads heavy mechanical torque evenly across the joint, eliminating structural weak points at the shaft neck.

4. Precision Gearbox & Low-Noise P6 Bearings

• Premium Reduction Gears: Cut entirely from high-grade quenched and tempered steel, the gear train delivers exceptional wear resistance, high fatigue strength, and low noise. The reduction box uses cast ADC12 aluminum for stabilized power transmission.

• P6 Deep-Groove Bearings: Both ends of the gear units are held firmly by P6-grade deep-groove ball bearings built to the strict EMQ (ZV2) standard. This controls internal vibration and resists sudden load shocks by focusing on optimal raceway surface roughness, ring roundness, and correct retainer design.

• Seals & Lubrication: Every unit is filled with imported high-performance Mobil grease and protected by dual-lipped skeleton TC oil seals from the German brand Oubaisi to guarantee a zero-leak system.

Design, Machining, and Quality Assurance Protocols

The OMK-250F follows a closed-loop engineering process to ensure reliable performance for global buyers:

• UG Software Simulation: Experienced engineers design every part in 2D and 3D based on classical actuator theory and field usage data. We verify structural fits using UG (Unigraphics) software simulation before building molds.

• 4-Axis Machining Centers: Fine metal cutting is executed on imported, high-precision 4-axis CNC machining centers equipped with rapid pneumatic clamps. Finished parts pass a Coordinate Measuring Machine (CMM) check to ensure all dimensions meet strict engineering tolerances.

• 100% Factory Acceptance Testing (FAT): Before shipment, every unit passes a mandatory multi-stage inspection sequence, including torque checks, 1500V/1800V dielectric tests, 48-hour load cycles, and IP68 submersion tests (0.2 MPa for 10 minutes).

Overall Dimensions and Performance Parameters

	OMK-100/160/250
	Parameter\Performance	OMK-100 (AC110V)	OMK-100 (AC220V)	OMK-100 (AC380V)	OMK-160 (AC110V)	OMK-160 (AC220V)	OMK-160 (AC380V)	OMK-250 (AC110V)	OMK-250 (AC220V)	OMK-250 (AC380V)
	Motor Power	120W	120W	90W	140W	140W	100W	140W	140W	100W
	Rated Current	1.93A	0.94A	0.44A	1.75A	0.96A	0.46A	1.75A	0.98A	0.48A
	Standard Time/Torque	30S/1000Nm	30S/1000Nm	30S/1000Nm	45S/1600Nm	45S/1600Nm	45S/1600Nm	75S/2500Nm	75S/2500Nm	75S/2500Nm
	Optional Time / Torque	15S/500NM	15S/500NM	15S/500NM	-	-	-	-	-	-
	Turning Angle	0~90° Adjustable	0~90° Adjustable	0~90° Adjustable	0~90° Adjustable	0~90° Adjustable	0~90° Adjustable	0~90° Adjustable	0~90° Adjustable	0~90° Adjustable
	Total Weight (kg)	17.0	17.0	17.0	18.0	18.0	18.0	18.0	18.0	18.0
	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

Global Compliance and Applications

The OMK-250F complies fully with the JB/T8219-1999 manufacturing standard for industrial electric actuators, certified under test report No. C16040-WT by the Shanghai Institute of Process Automation Instrumentation. Furthermore, OMKEE manufacturing plants maintain verified compliance with ISO 9001:2008 and the European Union CE & RoHS Certification, making this product ready for direct export into world markets.

Target Applications:

• Heavy Processing: Petroleum refineries, aggressive chemical processing, steel manufacturing mills, ironworks, metallurgy, and paper mills.

• Energy Systems: Thermal power plants (steam turbine speed control loops) and hydro-generation stations.

• Infrastructure: Municipal water treatment, automated sewage networks, marine shipbuilding, and large-scale power irrigation networks.

• Light Industrial: Food processing systems, pharmaceutical cleanrooms, and automated HVAC/Building Automation Systems (BAS).