CKDH Series Class 1E, Category K3 multi-turn nuclear-grade valve electric actuator is a core driving device independently R&D by Yangzhou Hengchun Electronics Co., Ltd. for the nuclear power field. Installed outside the containment vessel of nuclear reactors, it can operate stably under normal working conditions and SL2 safe shutdown seismic load, with a design life of 40 years, fully meeting the stringent requirements of nuclear power process systems.
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CKDH Series
The CKDH Series Class 1E Category K3 is an independently R&D core driving device for nuclear power applications, manufactured by Yangzhou Hengchun Electronics Co., Ltd. As a high-performance nuclear-grade multi-turn valve electric actuator, it is exclusively installed outside nuclear reactor containment vessels, delivering stable and reliable operation under both normal working conditions and SL2 safe shutdown seismic loads. This valve electric actuator integrates advanced mechanical transmission and intelligent protection mechanisms, fully meeting the stringent safety and performance requirements of nuclear power process systems, and is widely adapted to linear valves like gate valves and globe valves in nuclear power plants (NPPs).
Engineered for the extreme and harsh nuclear power environment, the CKDH Series adopts a modular design, which optimizes on-site installation and commissioning efficiency. Its R&D core prioritizes seismic resilience, radiation resistance and long-term operational stability—three indispensable performance factors for safety-related nuclear-grade actuator equipment in NPPs.
Certified as Seismic Category I, the actuator complies with SL2 safe shutdown seismic load requirements and can maintain full functionality during design basis events (DBEs). It is capable of withstanding γ-ray irradiation up to 110×10³Gy, fully meeting international nuclear safety standards for radiation resistance, and ensuring stable operation in high-radiation nuclear environments.
Boasting a 40-year design life, the CKDH Series far exceeds the average industry level, matching the lifecycle operation demands of nuclear power plants. Its core components—including ZL111 gearbox housing, 20CrMnTi worm and QAl10-4-4 worm gear—are made of high-quality alloy materials, undergoing precision machining and 100% strict factory inspection to eliminate common-cause failures.
With an IP68 protection rating, the actuator achieves top-level watertight and dustproof performance, adapting to the humid, dusty and corrosive harsh working conditions in nuclear power plants. It is integrated with a disc spring assembly and a professional torque control mechanism, realizing intelligent real-time overload protection and greatly improving the operational safety of nuclear-grade valves.
Parameter Category | Specific Parameters |
Basic Specifications | Product Type: multi-turn nuclear-grade valve electric actuator Nuclear Grade Certification: Class 1E electrical safety rating, Category K3 seismic classification, Seismic Category Ⅰ certification Design Life: 40 years Protection Grade: IP6 |
Power and Transmission | Power Supply: 380V three-phase AC power supply Transmission Structure: Worm gear mechanical transmission Output Form: Torque output (thrust output achievable via conversion device) Applicable Valves: Nuclear power gate valves, globe valves and other linear valves |
Environmental and Working Condition Withstand Capacity | Seismic Resistance: Withstands SL2 safe shutdown seismic load Irradiation Resistance: Withstands 110×10³Gy γ-ray irradiation Operating Conditions: Stable operation under normal working conditions and emergency safe shutdown conditions |
Core Protection and Material | Overload Protection: Disc spring assembly + torque control mechanism for intelligent overload protection Core Materials: ZL111 gearbox housing, 20CrMnTi worm, QAl10-4-4 worm gear Processing Technology: Precision mechanical processing with strict inspection throughout the whole process |
Structure and Feature | Design Feature: Modular architecture design Operation and Maintenance Advantages: Convenient and efficient installation and commissioning; easy disassembly, assembly and maintenance of components, reducing O&M costs and downtime Applicable Field: Nuclear power field (matching outside the containment vessel of nuclear reactor) |
The CKDH Series strictly abides by international nuclear safety standards including IEEE 382-2019 and RCC-E Chapter A5000, and holds authoritative ISO certification. It has passed rigorous loss of coolant accident (LOCA) resilience testing, fully complying with the regulatory guidelines of the Nuclear Regulatory Commission (NRC) and meeting the Class 1E nuclear-grade equipment requirements.
The production of the actuator adheres to international quality management systems such as ISO 9001 and IAEA SG-Q. Every unit undergoes 100% factory testing, including seismic simulation, radiation exposure, torque overload verification and IP68 protection performance testing, ensuring that all ex-factory products meet nuclear-grade quality standards.
It drives gate valves and globe valves in the cooling, feedwater and drainage circuits of nuclear islands, maintaining stable operation under SL2 seismic loads and ensuring the continuous and reliable operation of nuclear island auxiliary systems.
Applied to valve actuation for steam, feedwater and condensed water process pipelines in conventional islands, its IP68 protection and radiation resistance adapt to the complex working conditions, realizing precise control of medium delivery and supporting high-efficiency operation of conventional islands.
As a core device for emergency cooling and pressure relief systems, it quickly responds to valve opening and closing commands under emergency safe shutdown conditions, completing safe shutdown operations and safeguarding NPP equipment safety.
Adapted for valve actuation of water, steam and other nuclear-grade medium conveying pipelines, it operates stably for a long time in harsh nuclear environments, ensuring the smooth conveying of nuclear process media.
This nuclear-grade multi-turn valve electric actuator is specially adapted to linear valves in nuclear power plants, including gate valves and globe valves, and can output thrust through a dedicated conversion device to match different valve driving requirements.
It is designed to withstand SL2 safe shutdown seismic loads and 110×10³Gy γ-ray irradiation, with an integrated torque control mechanism for overload protection. In emergency conditions such as LOCA, it can quickly respond to control commands to complete valve actuation and support NPP safe shutdown.
As the original manufacturer, Yangzhou Hengchun provides professional technical support, on-site commissioning and long-term maintenance services for the CKDH Series, matching its 40-year design life to ensure the whole-life cycle operation of the actuator.
