The HKC HL Series (Covering models: HL-05KN, HL-07KN, HL-10KN, HL-12KN, HL-15KN, HL-18KN, HL-20KN, and HL-25KN) is engineered and manufactured by HKC Co., Ltd., a recognized global valve automation leader from South Korea. The HL Series is a high-performance electric linear actuator specifically designed for direct coupling with linear stroke valves, such as globe valves, modulating control valves, and diaphragm valves in severe-duty industrial processes.

KEY PRODUCT FEATURES AND OPERATIONAL ADVANTAGES:
1. High Linear Thrust Range (5 kN to 25 kN):
Delivers substantial axial push/pull forces spanning from 5 kN (5,000 N) up to 25 kN (25,000 N) with customizable travel strokes between 60 mm and 100 mm, ensuring positive valve tight shut-off against extreme fluid line differential pressures.
2. Precision Self-Locking Mechanism with Minimum Backlash:
Utilizes a precision-machined lead screw drive train that provides a fully mechanical self-locking feature with minimal backlash. This securely maintains valve plug positioning under fluctuating flow turbulence without requiring motor hold-current or risking position drift.
3. High-Precision PCU Proportional Modulating Control:
Integrates an advanced Proportional Control Unit (PCU) card supporting standard analog command inputs (4-20 mA DC, 0-10 V DC, 2-10 V DC) along with a Current Position Transmitter (CPT) 4-20 mA feedback loop, enabling smooth throttling control with less than 1% linearity tolerance.
4. Comprehensive Dual Mechanical & Thermal Safety Protections:
Equipped with dual force switches and SPDT travel limit switches (250V AC 16A) for both opening and closing directions, instantaneously cutting power upon detecting mechanical resistance or valve seating over-torque. The reversible induction motor is shielded by internal thermal overload protection triggering at 150±5 °C.
5. Manual Handwheel Override & Anti-Condensation Space Heater:
Features an integrated manual handwheel for effortless manual valve operation during plant outages or commissioning setup. An internal thermostatically-controlled space heater prevents internal condensation and protects sensitive electronic circuitry.
6. Rugged Corrosion-Resistant Enclosure – IP67/IP68 & Explosion-Proof:
Enclosed in high-grade die-cast aluminum alloy treated with hard anodizing and durable polyester powder coating. Rated IP67 weatherproof as standard (optional IP68 submersible 10m/72h) and certified to international explosion-proof standards: ATEX, IECEx, KCs, EAC, CCC (Ex db IIB T4 Gb, Ex tb IIIC T135°C Db).

TYPICAL INDUSTRIAL APPLICATIONS:
• Thermal Power & Industrial Boilers: Boiler feedwater control, steam pressure reducing stations, desuperheating systems, and blowdown valves.
• HVAC & District Energy: Chilled water modulating globe valves, AHU heating control, and district thermal exchange skids.
• Chemical & Petrochemical Refineries: Flow control for solvents, hydrocarbon gases, and aggressive media in classified hazardous zones.
• Food, Beverage & Pharmaceutical Processing: Sanitary diaphragm valve actuation and steam sterilizing (SIP/CIP) control loops.

• Manufacturer: HKC Co., Ltd.
• Series: HL Series (Electric Linear Actuator)
• Brand Origin: South Korea
• Applicable Models: HL-05KN, HL-07KN, HL-10KN, HL-12KN, HL-15KN, HL-18KN, HL-20KN, HL-25KN
• Actuation Type: Linear Thrust Stroke
• Output Thrust Force Capabilities:
  - Model HL-05KN: 5,000 N (5 kN)
  - Model HL-07KN: 7,000 N (7 kN)
  - Model HL-10KN: 10,000 N (10 kN)
  - Model HL-12KN: 12,000 N (12 kN)
  - Model HL-15KN: 15,000 N (15 kN)
  - Model HL-18KN: 18,000 N (18 kN)
  - Model HL-20KN: 20,000 N (20 kN)
  - Model HL-25KN: 25,000 N (25 kN)
• Maximum Stroke: 60 mm to 100 mm (Depending on model and yoke mounting)
• Stem Speed: Selectable based on motor gearing and screw pitch configuration
• Power Supply Options:
  - 1-Phase: 110V / 220V AC (50/60 Hz, ±10%)
  - 3-Phase: 220V / 380V / 440V / 460V AC (50/60 Hz, ±10%)
  - DC Power: 24V DC or 24V AC/DC
• Duty Rate (IEC34-1):
  - On-Off Duty (S2): Max. 30 min (at 50% average load)
  - Modulating Duty (S4): 50% duty cycle, 300 to 1,600 starts/hour
• Drive Motor: Reversible induction motor with built-in thermal protection (trips at 150±5 °C / resets at 97±15 °C)
• Travel Limit Switches: 2 x SPDT (250V AC 16A rating) for Open / Close
• Force Switches: 2 x SPDT (250V AC 16A rating) for push/pull overload cutoff
• Auxiliary Limit Switches: Optional SPDT switches for models HL-10KN through HL-25KN
• Anti-Condensation Heater: Thermostatically-controlled space heater
• Manual Override: Direct manual handwheel
• Self-Locking: Mechanical self-locking drive with minimal backlash
• Control Options:
  - Standard On/Off Control
  - CPT: Current Position Transmitter (Potentiometer / 4-20 mA DC output)
  - PCU: Proportional Control Unit (Input: 4-20 mA / 0-10 V / 2-10 V / 1-5 V DC; Output: 4-20 mA DC)
  - Local Control Unit (LCU)
• Cable Conduit Entries:
  - Standard: 2 x PF 3/4"
  - Flameproof: 2 x NPT 3/4" or 2 x M25
• Housing Materials: High-grade die-cast Aluminium alloy, carbon steel, and aluminium bronze
• External Surface Coating: Hard anodizing treatment plus polyester powder coating
• Ingress Protection (Enclosure):
  - Standard: Weatherproof IP67
  - Option: Watertight submersible IP68 (10 m depth for 72 hours)
• Explosion-Proof Certification (Optional): Ex db IIB T4 Gb, Ex tb IIIC T135°C Db (ATEX, IECEx, KCs, EAC, CCC)
• Ambient Temperature Range:
  - Standard: -20 °C ... +70 °C
  - Flameproof: -20 °C ... +60 °C
• Ambient Humidity: Max. 90% RH (Non-condensing)