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How to Choose a Pneumatic Actuator? What Is Considered? Things to Know About PneumaticActuators Pneumatic actuators work with the compressed air force. It also works with pressurized gas if needed. Generally, 90-degree final control elements such as butterfly valves, ball valves, and plug valves are used for on-off and proportional control purposes. Features to Consider When Choosing a Pneumatic Actuator Whether the actuator is double acting/single acting or three position Actuators with 120-degree and 180 degree rotation If it is a hygienic process, choosing the appropriate actuator Actuator torque value at P=5 bar Nm output The torque value of the valve to which it will be connected, in Nm Line pressure max. min. fluid temperature Valve connection size, and threaded/flanged connection Opening and closing frequency of the actuator Rotary / Linear type actuator Namur valve/direction valve operating voltage Will the limit switch box be used? Control type on-off/ proportional Bottom hole square dimension of the actuator shaft Ball/ butterfly/ plug type and number of ways of the valve The viscosity of the fluid Actuator with torque of more than 25% valve torque is selected Single-acting(spring return) actuators should be selected according to the small torque value. ATEX certified, -50 C working environment Which Type of Actuator Is Right for Your Process? One of the pneumatic actuator types is selected by considering the application, fluid, and environmental factors in which the actuator will be used. After the selection is made, the optional features are checked. AT Pneumatic Actuator Optional Feature AT actuator (standard production)( -20 C.+80 C) Actuator that can withstand high temperature ( -20 C...+150 C) AT actuator operating at very low temperature ( -50 C...+85 C) Epoxy painted actuator body (For aggressive media) Teflon coated actuator stem (For aggressive media) AISI 304 stainless pinion gear (For aggressive media) Actuator with PVC body (For aggressive media) Stainless steel body pneumatic actuator (For aggressive media) ATEX certified pneumatic actuator (For aggressive environment) Scotch yoke type actuators (for gas over oil applications) Actuators for food and hygiene applications (For dairy, beverage and filling systems) Operation of AT Pneumatic Actuated Valve Generally, the preferred actuator type is standard type and double-actuated rotary pneumatic actuators. Pneumatic actuators are used for opening and closing butterfly valves, ball valves, plug valves and dampers. Pneumatic actuator valves do the on-off function in two ways: With on-off control (Namur solenoid valve and 1/4"-5/2 or 3/2 single coil valve are used to provide this control.) With Proportional Control (Rotary electro pneumatic positioners or Rotary pneumatic pneumatic positioners are used) In the selection of pneumatic actuators, the characteristics of the valve to be controlled should also be examined. This valve should be a valve that turns 90 degrees to fully open and fully closed positions. Such valves are ball valves, butterfly valves and plug valves. The torque value required for opening and closing the valve is determined as Nm. 25% more of the torque value of the valve is added as a safety factor. The equivalent of this value is found in the AT actuator catalogue, with the output torque value of the actuator at P: 5 bar as Nm (corresponding to the safety coefficient of the valve to be controlled). The actuator type at this value opens and closes the selected valve only with 6 bar control air pressure. The valve's stem output must match the actuator's stem (pinion gear) seat (square or star shaped). In cases where it does not fit, it is necessary to use an interconnection and adapter. Valve-actuator connection flange and actuator-valve connection holes are in ISO 5211 standard. Pinion gear bottom hole is also standard. If the valve shaft output dimensions are also standard, there will be no problem. But this is something that should definitely be controlled. Double acting actuators are controlled by 1/4"-5/2 single coil namur directional valve or double coil namur directional valve. Single acting (spring return) actuators are controlled by a 1/4"-3/2 single coil namur directional valve. 3-position pneumatic actuators are controlled by a special TORK group directional valve. Stroke adjustment in pneumatic actuators; It is made with two stroke adjustment bolts located on the actuator body and the upper part of the namur valve. On request, stroke adjustment bolts can be added from the covers. Thus, double-sided stroke adjustment is provided. But the standard is; It is to adjust the stroke with the stroke adjustment bolts on the body.

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.