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Quarter-Turn Pneumatic Actuators: Design, Functionality, and Industrial Applications
Release date：2025/6/30
1. Definition and Operating Principle
A quarter-turn pneumatic actuator is a compact rotary device that converts compressed air energy into precise 90° rotational motion, widely used to automate valves (e.g., ball valves, butterfly valves) in industrial systems. Its operation relies on pneumatic pressure acting on pistons, diaphragms, or vanes to generate torque, enabling rapid valve opening/closing (typically ≤1 second6). Key components include:
Piston/Rack-and-Pinion Mechanism: Translates linear piston motion into rotary torque via a gear system.
Vane-Type Rotor: Direct air pressure on vanes drives rotation within a cylindrical chamber.
Spring-Return or Double-Acting Design: Spring-return models use air pressure for rotation and springs for resetting; double-acting versions rely on bidirectional air supply.