341RXD-800 Explosion-proof Quarter-turn Electric Actuator

341RXD-800 Quarter-turn Electric Actuator Product Introduction

The 341RXD-800 quarter-turn electric actuator is a high-end electronic actuator in the 341 series designed for ultra-heavy-duty, high-level, and extremely harsh operating conditions. It is specifically built to drive super-large, ultra-high load butterfly valves, ball valves, plug valves, and large dampers/baffles for 90° rotation equipment. It is primarily used for on-off control and precise positioning of pipeline media, serving as the core driving component connecting control signals to terminal valves in industrial automation control systems. Building upon the 341RXD-600, this product achieves a leapfrog upgrade in torque output, structural load-bearing capacity, and environmental adaptability, while further optimizing control accuracy and operational stability. With features such as ultra-strong torque, precise positioning, convenient operation, durable protection, and wide adaptability, it is widely used in power, chemical, water supply and drainage, HVAC, environmental protection, metallurgy, and petrochemical industries. It is suitable for ultra-heavy-duty, high-pressure, high-temperature, and extremely harsh conditions, making it the preferred core equipment for automation retrofitting and new projects involving super-large and ultra-high load valves.

The product adopts an integrated, ultra-heavy-duty, reinforced, and compact structural design. The complete unit consists of a dedicated ultra-high torque reversible reduction motor, a precision gear transmission mechanism, a high-performance electronic control module, a high-precision position feedback unit, a manual operation mechanism, and a high-strength protective housing. The drive motor uses an industrial-grade, low-noise, ultra-high torque asynchronous motor with an insulation class of F and excellent heat dissipation performance. It is built-in with a quadruple protection device against overheating, overloading, stalling, and phase loss. It can automatically cut off power during long-term continuous operation, frequent start-stops, or abnormal load conditions, effectively avoiding motor burnout and significantly improving the operational safety and service life of the whole unit. The transmission system uses a gear set with hardened tooth surfaces that have undergone precision machining and deep heat treatment, paired with ultra-heavy-duty wear-resistant bearings and a long-term lubrication structure. This results in minimal transmission backlash, high mechanical efficiency, and smooth, stall-free operation. It efficiently converts the motor's rotational power into 90° quarter-turn output, ensuring the valve reaches the open/close position smoothly, reducing impact on the valve stem and seals, and extending the service cycle of the entire valve set.

The 341RXD-800 has a rated output torque of 8000 N·m and an operating time of approximately 65 seconds/90°. With ample torque reserve and a 30% torque redundancy design, it can stably drive various quarter-turn valves with diameters ranging from DN1000 to DN1500. It can effectively overcome the huge resistance caused by high pipeline pressure, high flow rate, high viscosity, and high-temperature media, meeting the valve drive requirements under ultra-heavy-duty, high-level, and extremely harsh conditions. The actuator supports dual control of on-off signals and 4-20mA analog signals. It can receive external contact signals for forward/reverse and stop control, as well as achieve proportional positioning control. It can be directly connected to PLCs, DCSs, and other automation control systems for remote centralized control without the need for additional servo amplifiers, featuring simple wiring and convenient debugging. Position feedback employs a high-precision conductive plastic potentiometer with high resolution and precise positioning. It outputs a linear feedback signal corresponding to the valve opening in real-time, allowing the central control system to accurately grasp the valve position status, forming closed-loop control to ensure control accuracy and system stability.

The product is equipped with a perfect manual/auto bumpless switching mechanism. The manual operation uses a reinforced labor-saving worm gear structure, paired with a thickened and reinforced handwheel. During equipment commissioning, power outage maintenance, or emergency conditions, it can be easily switched to manual mode for on-site valve operation. The operation is labor-saving, the switching is smooth, and it effectively improves on-site emergency response capabilities. Built-in mechanical and electrical dual limit protections precisely limit the 0° and 90° travel positions to prevent over-travel damage to the actuator and valve. It supports forward/reverse action switching, allowing flexible setting of the valve opening/closing direction according to on-site installation methods and process requirements. In the event of signal loss, it can maintain the current valve position or be set to fully open/close, adapting to the safety control logic of different working conditions and ensuring the process flow is safe and controllable.

In terms of protection and installation design, the 341RXD-800 housing is made of high-strength thickened alloy die-casting, featuring a robust structure, excellent rigidity, and outstanding vibration and impact resistance. It can adapt to high-level, extremely harsh conditions involving severe pipeline vibration in industrial sites. The whole unit has a protection rating of IP65, offering excellent dust, water, and oil resistance. It can operate stably at ambient temperatures of -20℃ to 60℃ and humidity ≤95% (non-condensing), adapting to harsh industrial environments such as dampness, dust, and mild corrosion. It is suitable for high-pressure and high-temperature medium pipeline conditions with temperatures ≤380℃ and nominal pressures ≤40.0MPa. Installation is flexible, allowing for 360° arbitrary orientation installation without angle restrictions. The bottom connection interface is standardized with strong compatibility with various quarter-turn valves. Equipped with reinforced mounting brackets and high-strength connecting shafts, on-site installation requires no complex modifications, significantly shortening the construction cycle and reducing installation costs.

In practical application scenarios, the 341RXD-800 has wide adaptability and is compatible with various media such as water, steam, high-temperature gas, oil, and weakly corrosive fluids. In the power industry, it is used for the control of dampers and baffles in air ducts and flues of power plant main systems, as well as high-pressure water system valves. In the chemical industry, it is suitable for driving super-large butterfly valves and ball valves in pipelines transporting weakly corrosive, high-pressure, and high-temperature media. In the municipal water supply and drainage field, it is used for the switching and positioning of super-large main pipe valves in water plants and sewage treatment plants. In HVAC and heating systems, it undertakes the automatic control tasks of valves in large heat exchange stations and urban central heating main pipes. In the environmental protection field, it can be used for large dampers and valve drives in desulfurization, denitrification, and dust removal systems, while also meeting the control needs of ultra-heavy-duty, high-pressure, and high-temperature medium transport pipelines in metallurgy and petrochemical industries. The product operates stably with a low failure rate, capable of adapting to frequent start-stops and long-term continuous operation, meeting automation control needs under ultra-heavy-duty, high-level, and extremely harsh conditions.

The core components of this product have a high degree of standardization and strong interchangeability, long mechanical life, and convenient and efficient troubleshooting and component replacement in later maintenance without special tools, significantly reducing the total cost of ownership. Compared with similar heavy-duty actuators, the 341RXD-800 stands out in torque output, control accuracy, operational smoothness, and environmental adaptability. It possesses both the reliable performance of industrial-grade products and a reasonable cost-performance ratio. Relying on stable operation performance, convenient installation and debugging, and wide adaptability to working conditions, the 341RXD-800 provides industrial users with efficient and safe quarter-turn drive solutions, helping super-large and ultra-high load valves achieve automation control, improving system operational efficiency and safety, and adapting to automation control needs under various ultra-heavy-duty, high-level, and extremely harsh conditions.