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The quarter-turn double acting rack and pinion actuator is a type of pneumatic actuator commonly used in industrial applications to control the movement of valves and other rotary equipment.   This actuator operates by using a rack and pinion mechanism. It consists of two pistons connected to racks, which engage with a pinion gear. When air pressure is applied to one side of the pistons, it creates a force that rotates the pinion gear, thereby rotating the output shaft. This rotation allows the actuator to open or close valves or control the position of rotary machines.   One of the key advantages of the double acting rack and pinion actuator is its ability to provide bi-directional control. It can generate torque in both the clockwise and counterclockwise directions, allowing for greater flexibility in valve positioning. This makes it suitable for applications where precise control and quick response are required.   The actuator is designed to be compact and lightweight, making it easy to install and integrate into various systems. It typically has a modular design, allowing for easy maintenance and replacement of parts if necessary.   To ensure smooth operation and longevity, double acting rack and pinion actuators are equipped with bearings and guides on the racks and pistons. These components help reduce friction, increase the actuator's cycle life, and prevent shaft blowout.   The actuator is available in different sizes and torque ranges to suit different application requirements. It can be connected to valves using standardized mounting interfaces such as NAMUR, ISO5211, or DIN3337. This allows for easy and standardized installation and compatibility with a wide range of valves.

90-degree pneumatic rotary actuator is a type of actuator used to control the rotational movement of valves, such as butterfly valves or ball valves. It is designed to provide a 90-degree rotation for the valve, allowing it to be fully opened or closed.   This type of actuator operates using compressed air as the power source. When the air is applied to the actuator, it drives the internal mechanism, usually a rack and pinion or a piston, which rotates the valve shaft by 90 degrees.   The 90-degree pneumatic rotary actuator is available in various sizes and torque ratings to match the requirements of different valve sizes and operating conditions. It is essential to choose the correct actuator size and torque output to ensure proper valve operation.   When selecting a 90-degree pneumatic rotary actuator for a butterfly valve or ball valve, consider factors such as the valve size, operating pressure, and the torque required to open and close the valve. It is also crucial to ensure compatibility between the actuator and the valve, as they need to be properly matched in terms of size and connection type.   Consulting with valve manufacturers, actuator suppliers can help you select the appropriate 90-degree pneumatic rotary actuator for your specific valve application.