The AT Aluminum Alloy Pneumatic Actuator is a compact and reliable quarter-turn pneumatic actuator designed to automate the opening and closing of rotary valves. It uses compressed air to generate rotational torque and is widely used with ball valves, butterfly valves, plug valves and other quarter-turn valves.
Constructed with a lightweight yet durable aluminum alloy housing, the AT pneumatic actuator offers excellent corrosion resistance, low weight and a compact design. It is available in double-acting and single-acting configurations, including Fail-Open (FO) and Fail-Close (FC) options, to meet different process safety requirements.
The actuator can be equipped with valve positioners, solenoid valves, limit switches and air filter regulators for automated valve control and remote monitoring. With fast response, reliable operation and easy installation, the AT aluminum alloy pneumatic actuator is suitable for industrial automation applications in water treatment, chemical processing, petrochemical, food and beverage, HVAC and general process industries.
AT Aluminum Alloy Pneumatic Actuator – Working Principle
The AT Aluminum Alloy Pneumatic Actuator features a rack-and-pinion quarter-turn design. Compressed air drives the pistons, while the piston racks rotate the central output gear to provide 0–90° rotary operation for automatic valve opening and closing. AT actuators are available in Double-Acting (DA) and Single-Acting Spring-Return (SR) configurations.
Double-Acting Pneumatic Actuator (DA)：After air preparation, compressed air enters one side of the actuator cylinder, pushing the piston toward the opposite side. The rack attached to the piston engages with the central output gear, converting linear piston movement into 90° rotary motion to open or close the valve.
When the air supply is switched, compressed air enters the opposite chamber, driving the piston in the reverse direction. The output gear rotates accordingly, causing the valve to close or open.
In the event of air supply failure, the double-acting actuator has no spring-return mechanism, so the actuator does not automatically return to a predetermined fail-safe position. If fail-in-place (FL) operation is required, an appropriate pneumatic lock-up valve / position-maintaining valve should be installed.
Single-Acting Pneumatic Actuator (SR, Spring Return)：
Air Supply: Compressed air enters the actuator cylinder and overcomes the force of the preloaded springs, moving the pistons and driving the rack-and-pinion mechanism to rotate the output shaft and open or close the valve.
Air Failure: When the air supply is interrupted, the preloaded springs release their stored energy and automatically return the pistons to the initial position. This provides a predefined Fail-Open (FO) or Fail-Close (FC) valve position, depending on the actuator configuration.
A pneumatic actuator converts the energy of compressed air into mechanical motion, enabling the valve to open, close, or continuously modulate its position for reliable and automated valve control. For pneumatic actuator selection and procurement, please contact our technical team and provide the relevant operating parameters so that we can recommend the most suitable actuator model for your application. （Unit: mm）
| Size | Part No | A | B | C | D | E | F | G | H | I | J | K | L | M | N | φ0 | Air | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AT052 | XLXAT-052 | 150 | 73 | 67 | 93 | 30 | 42 | 14 | 80 | 30 | F05-50 | F03-36 | M6X11 | M5X10 | 11 | φ22 | G1/4 | |
| AT063 | XLXAT-063 | 170 | 89 | 82 | 109 | 36 | 47 | 18 | 80 | 30 | F03-36 | F07-70 | M8X15 | M6X12 | 14 | φ27 | G1/4 | |
| AT075 | XLXAT-075 | 186 | 101 | 95 | 121 | 43 | 54 | 18 | 80 | 30 | F03-36 | F07-70 | M8X15 | M6X12 | 14 | φ27 | G1/4 | |
| AT083 | XLXAT-083 | 213 | 110 | 99 | 130 | 46 | 57 | 20 | 80 | 30 | F03-36 | F07-70 | M8X15 | M6X12 | 17 | φ27 | G1/4 | |
| AT092 | XLXAT-092 | 266 | 118 | 112 | 138 | 51 | 59 | 21 | 80 | 30 | F03-36 | F07-70 | M8X15 | M6X12 | 17 | φ33 | G1/4 | |
| AT105 | XLXAT-105 | 272 | 135 | 124 | 155 | 58 | 65 | 24 | 80 | 30 | F03-36 | F10-102 | M10X18 | M8X14 | 22 | φ33 | G1/4 | |
| AT125 | XLXAT-125 | 305 | 157 | 146 | 187 | 68 | 75 | 27 | 130 | 30 | F03-36 | F10-102 | M10X18 | M8X14 | 22 | φ43 | G1/4 | |
| AT140 | XLXAT-140 | 396 | 174 | 162 | 204 | 76 | 78 | 32 | 130 | 30 | F03-36 | F12-125 | M12X22 | M10X18 | 27 | φ50 | G1/4 | |
| AT160 | XLXAT-160 | 465 | 199 | 185 | 229 | 88 | 88 | 32 | 130 | 30 | F03-36 | F12-125 | M12X22 | M10X18 | 27 | φ50 | G1/4 | |
| AT190 | XLXAT-190 | 532 | 232 | 217 | 263 | 103 | 103 | 40 | 130 | 30 | F03-36 | F14-140 | M16X23 | / | 36 | φ60 | G1/4 | |
| AT210 | XLXAT-210 | 542 | 257 | 236 | 288 | 114 | 114 | 40 | 130 | 30 | F03-36 | F14-140 | M16X25 | / | 36 | φ72 | G1/4 | |
| AT240 | XLXAT-240 | 610 | 291 | 265 | 321 | 130 | 130 | 50 | 130 | 30 | F03-36 | F16-165 | M20X25 | / | 46 | φ80 | G3/8 | |
| AT270 | XLXAT-270 | 730 | 326 | 301 | 356 | 147 | 147 | 50 | 130 | 30 | F03-36 | F16-165 | M20X25 | / | 46 | φ80 | G1/2 | |
| AT300 | XLXAT-300 | 822 | 354 | 330 | 384 | 140 | 173 | 55 | 130 | 30 | F03-36 | F16-165 | M20X25 | / | 46 | φ80 | G1/2 | |
| AT350 | XLXAT-350 | 930 | 410 | 383 | 440 | 164 | 195 | 55 | 130 | 30 | F03-36 | F16-165 | M20X25 | / | 46 | φ80 | G1/2 | |
| AT400 | XLXAT-400 | 960 | 466 | 456 | 496 | 259 | 259 | 60 | 130 | 30 | F03-36 | F16-165 | M20X25 | / | 55 | φ80 | G1/2 |
AT Aluminum Alloy Pneumatic Actuator – Key Advantages
Rack-and-Pinion Design for Smooth and Stable Torque Output：The symmetrical dual-piston configuration provides balanced force distribution, smooth operation and minimal mechanical impact. Adjustable mechanical travel stops are integrated at both ends, allowing precise adjustment of the 0° and 90° end positions for accurate valve opening and closing.
Lightweight, Corrosion-Resistant Aluminum Alloy Housing：The actuator housing is manufactured from high-quality aluminum alloy with hard anodized surface treatment, providing low weight, high mechanical strength, excellent wear resistance and corrosion resistance. Compared with stainless steel pneumatic actuators, the aluminum alloy design offers a more cost-effective solution while significantly reducing the overall installation load of the valve and actuator assembly.
Multiple Configurations for Different Fail-Safe Requirements：The AT series is available in Double-Acting (DA) and Single-Acting Spring-Return (SR) configurations. Single-acting actuators can be configured as Fail-Open (FO) or Fail-Close (FC). When combined with a pneumatic lock-up valve, the actuator can also provide Fail-in-Place (FL) operation, supporting different process safety and emergency shutdown requirements.
Standardized Interfaces for Easy Valve Integration：The output mounting flange and air supply interfaces comply with ISO 5211 standards, enabling direct installation on ball valves, butterfly valves, plug valves and other quarter-turn valves. The actuator can also be equipped with a wide range of automation accessories, including solenoid valves, limit switches, valve positioners and air filter regulators.
Fast Response and Easy Maintenance：With low internal friction and an optimized rack-and-pinion mechanism, the AT pneumatic actuator provides fast and responsive valve operation. Its modular construction simplifies disassembly, inspection and maintenance, while sealing components can be replaced conveniently. With a wide operating temperature range, the actuator is suitable for a broad range of industrial applications, including water treatment, chemical processing, petrochemical, HVAC, food and beverage, and general industrial automation.
