The Pneumatic Diaphragm Actuator is a linear-stroke, spring-return actuator designed for precise and reliable control valve automation. Compressed air acts on the diaphragm to drive the stem or pushrod in a linear motion, enabling continuous adjustment of flow rate, pressure, temperature, level and other process parameters when paired with suitable control valves.
The actuator is available in direct-acting and reverse-acting configurations. When the air supply is interrupted, the internal spring automatically returns the actuator to its preset safe position, providing air-to-open (ATO) or air-to-close (ATC) fail-safe operation.
With smooth operation, high control accuracy and easy maintenance, the pneumatic diaphragm actuator is well suited for demanding process control applications. Its pneumatic design also offers advantages for intrinsically safe and hazardous-area applications. Optional accessories such as valve positioners, handwheel overrides and other pneumatic control components can be integrated for enhanced control and manual operation.
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 | L | H | FC-H1 | FO-H1 | H2 | A | C | D | M | D1 | n-d | E | F | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 22 | XTH22-BOT | 290 | 297 | 90 | 106 | 185 | 250 | 20 | 60 | M8 | 80 | 2-10 | 210 | 250 | |
| 23 | XTH23-BOT | 290 | 326 | 90 | 115 | 185 | 250 | 20 | 60 | M8 | 80 | 2-10 | 210 | 250 | |
| 34 | XTH34-BOT | 365 | 417 | 130 | 170 | 235 | 300 | 22 | 80 | M12X1.25 | 105 | 4-12 | 240 | 300 | |
| 45 | XTH45-BOT | 470 | 525 | 135 | 195 | 322 | 400 | 25 | 95 | M16X1.5 | 118 | 4-14 | 330 | 400 | |
| 56 | XTH56-BOT | 597 | 731 | 170 | 270 | 430 | 500 | 35 | 100 | M20X1.5 | 130 | 4-18 | 375 | 500 |
Pneumatic Diaphragm Actuator – Key Features
Simple Construction & Stable Operation：The streamlined design provides smooth linear movement, high positioning accuracy and reliable performance for continuous process control applications.
Spring-Return Fail-Safe Operation：The integrated spring-return mechanism provides inherent fail-safe functionality. In the event of air supply failure, the actuator automatically returns the valve to its preset safety position.
Compact Multi-Spring Design：The multi-spring configuration offers a compact and lightweight design, reducing installation space requirements while making installation, commissioning and maintenance easier.
Low Friction & Minimal Hysteresis：Low friction and minimal hysteresis provide responsive and precise actuator movement. When combined with a valve positioner, the actuator enables high-accuracy proportional control for demanding process automation applications.
