Rack And Pinion Type Pneumatic Actuators

The HPR series pneumatic actuator is a widely applied rack and pinion type part-turn pneumatic actuator. Its cylinder body is formed by extruded aluminum, with the inner surface finely ground and hard anodized, ensuring long service life, low friction coefficient, and rapid movement. It is suitable for valves requiring 0-90 degree rotation, such as ball valves, butterfly valves, and plug valves.

Design Features：

• Corrosion Resistance: The cylinder body is extruded from ASTM 6005 aluminum alloy (stainless steel cylinders are available based on customer application requirements, subject to final selection). The inner surface undergoes fine grinding and anodic oxidation to enhance corrosion resistance and extend service life.

• Adjustable Torque: The modular pre-load spring cartridge allows for safe and convenient disassembly of the single-acting actuator. The torque output range can be adjusted by varying the number of springs installed.

• Adjustable Opening: External independent stroke adjustment screws allow for convenient and precise ±4° adjustment in both directions, ensuring precise alignment between the actuator's fully open and fully closed positions with the corresponding valve positions.

• Reliable Structure: The integrated gear-and-bearing design enhances operational safety. With nickel-plating treatment, the assembly offers improved fracture resistance and extended service life.

• Fast Response Speed: The rack and pinion mechanism achieves transmission efficiency of over 90%, minimizing energy loss. The direct engagement of pneumatic drive with the gear mechanism enables rapid start-stop performance, making it ideal for high-speed cycling applications.

• Universal Connection Standard: The multi-functional position indicator with NAMUR groove enables easy connection with a wide range of standard sensor components.

For the torque table, please refer to 《HITORK Pneumatic Actuator (V4.0--2025.11--HK)》.