HQFH series Class 1E, Category K3 spring-return valve electric actuator is a nuclear-grade emergency drive device developed by Yangzhou Hengchun Electronics for nuclear power ventilation and process systems outside reactor containments. It features a motor-driven + scroll spring energy storage structure: the spring stores energy during normal operation and drives the valve to reset safely within ≤5–10S in emergencies like power failure.
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HQFH series
The HQFH series Class 1E, Category K3 Spring-return Valve Electric Actuator is a high-end nuclear-grade emergency drive device independently developed by Yangzhou Hengchun Electronics, a professional China manufacturer of valve actuators. Exclusively engineered for nuclear power ventilation and process systems outside reactor containments, this actuator features a proprietary motor-driven + scroll spring energy storage structure. It realizes automatic energy storage during normal operation and drives valves to safe reset within ≤5–10S in sudden emergencies such as power failure, providing a reliable safety guarantee for nuclear power plant operation. Compliant with HAF003 and IEEE 382-2006 industry standards, it is a core equipment for nuclear power emergency shutdown and safety control, and the flagship product of Hengchun’s nuclear-grade valve electric actuator line.
Ultra-fast emergency response: Completes valve safe reset in ≤5-10 seconds, meeting nuclear power’s stringent emergency control requirements.
Extreme environmental resistance: Withstands 5×10⁴Gy γ-ray irradiation and holds IP68 high protection rating, adapting to harsh nuclear power working conditions.
Superior structural durability: Made of premium alloys ZL111 and 20CrMnTi, it achieves a 40-year service life and 3,000 spring cycles, reducing long-term maintenance costs.
High seismic performance: Possesses Class I seismic certification, operating stably under SL2 safe shutdown earthquake load in nuclear power plants.
Precise torque control: Covers a torque range of 60–500Nm, matching various nuclear-grade linear valves for accurate actuation.
Technical Item | Parameter |
Model | HQFH series Class 1E, Category K3 |
Compliant Standards | HAF003, IEEE 382-2006 |
Seismic Certification | Class I |
Radiation Resistance | 5×10⁴Gy γ-ray irradiation |
Protection Class | IP68 |
Torque Range | 60–500Nm |
Service Life | 40 years |
Spring Cycles | 3,000 times |
Main Material | ZL111, 20CrMnTi alloy |
Energy Storage Structure | Motor-driven + scroll spring energy storage |
Core Function | Emergency valve reset in power failure and other accidents |
Parameter Category | Specific Parameters |
Basic Specifications | Product Type: Quarter-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)<bApplicable 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 110×10⁴Gy γ-ray irradiation Operating Conditions: Stable operation under normal working conditions and emergency safe shutdown |
Core Protection and Material | Overload Protection: Disc spring assembly + torque control mechanism for intelligent overload protection Core Materials: ZL111 gearbox housing, 20CrMnTi worm, QA110-4-4 worm gear Processing Technology: Precision mechanical processing with strict inspection throughout the whole process |
Structure and Features | 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) |
As an ISO-certified manufacturer, Hengchun Electronics implements a strict full-process quality control system for the Spring-return Valve Electric Actuator from raw material procurement to finished product delivery. All core components undergo precision testing, and the actuator has passed nuclear-grade certification, Class I seismic testing and radiation resistance verification. Adhering to the Manufacturing & Quality management system of Hengchun, the product complies with the highest quality standards of the nuclear power industry. With authoritative Certificates & Honors and a global quality inspection system, the HQFH series ensures zero quality defects in actual application and long-term stable operation.
Stably drives valves in the cooling, feedwater and drainage circuits, ensuring continuous and reliable operation of nuclear island auxiliary systems under normal and earthquake conditions.
Adapts to the complex working conditions of conventional islands, realizing precise control of steam, feedwater and condensed water medium delivery through valve actuation.
Serves as the core drive device for emergency cooling and pressure relief systems, completing safe shutdown operations quickly in emergencies to safeguard nuclear power equipment safety.
Withstands high-intensity irradiation and harsh environments, ensuring smooth conveying of nuclear-grade process media such as water and steam.
It adopts a motor-driven + scroll spring energy storage structure. The spring stores energy during normal plant operation, and when power failure or other emergencies occur, the stored energy is released immediately to drive the valve to complete safe reset within ≤5–10S.
It is specially adapted for linear valves in nuclear power systems, including gate valves and globe valves, and can be customized to match different valve specifications within the torque range of 60–500Nm.
