The BW Single-Cylinder Double-Acting Pneumatic Actuator with an integrated hydraulic manual override module is a reliable actuation and control solution designed for industrial pipeline valves. It uses compressed air to provide reliable valve opening and closing, while the integrated hydraulic manual override system enables emergency manual operation when the air supply is interrupted, the pneumatic system fails, or the valve must be operated under no-air-pressure conditions.
Designed for demanding industrial applications, this pneumatic actuator with hydraulic manual override can be widely used with on-off valves, control valves, ball valves, butterfly valves and other industrial valve types. The combination of pneumatic automation and hydraulic emergency operation provides enhanced operational reliability, fail-safe capability and manual backup control for critical process pipelines.
Working Principle
Normal Operation: Double-Acting Pneumatic Drive：During normal operation, compressed air is regulated, filtered and supplied alternately to the two chambers of the pneumatic cylinder through the air preparation unit. When one chamber is pressurized and the opposite chamber is exhausted, the piston moves toward the exhaust side and generates the required output torque to open the valve. When the air supply is switched, the opposite chamber is pressurized while the other chamber is exhausted, causing the piston to return and close the valve. This process provides reliable and automatic bidirectional valve operation through pneumatic pressure.
Air Failure / Power Failure: Hydraulic Manual Override：When the air supply is completely interrupted, the actuator can be switched to manual hydraulic override mode. By repeatedly operating the external manual lever, the integrated manual hydraulic pump pressurizes the hydraulic fluid and delivers it to the actuator chamber, generating hydraulic force to move the piston and manually operate the valve. This provides reliable emergency valve opening and closing without pneumatic power. Once the compressed-air supply is restored, the actuator can be switched back to automatic double-acting pneumatic 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 | L1 | L2 | L3 | H | Q | U | V | Q2 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 17 | XLX-B17-1D-HWY | 328 | 164 | 335 | 1047 | 62 | 278 | 260 | 260 | 260 | |
| 20 | XLX-B20-1D-HWY | 373 | 187 | 389 | 1176 | 92 | 372 | 260 | 260 | 260 | |
| 25 | XLX-B25-1D-HWY | 373 | 187 | 394 | 1183 | 148 | 484 | 260 | 260 | 260 | |
| 28 | XLX-B28-1D-HWY | 436 | 218 | 438 | 1330 | 163 | 534 | 320 | 320 | 320 | |
| 30 | XLX-B30-1D-HWY | 436 | 218 | 464 | 1355 | 191 | 584 | 320 | 320 | 320 | |
| 35 | XLX-B35-1D-HWY | 474 | 237 | 460 | 1320 | 200 | 645 | 225 | 720 | 360 | |
| 40 | XLX-B40-1D-HWY | 474 | 237 | 460 | 1320 | 227 | 700 | 225 | 720 | 360 | |
| 50 | XLX-B50-1D-HWY | 710 | 355 | 633 | 1878 | 225 | 760 | 390 | 760 | 360 | |
| 60 | XLX-B60-1D-HWY | 780 | 390 | 650 | 2127 | 295 | 915 | 415 | 785 | 360 | |
| 70 | XLX-B70-1D-HWY | 780 | 390 | 650 | 2127 | 370 | 1066 | 415 | 785 | 360 |
Key Advantages of BW Single-Cylinder Double-Acting Pneumatic Actuator with Hydraulic Manual Override
Dual-Mode Redundant Safety: Combining automatic pneumatic operation for normal service with a manual hydraulic override for emergency operation, the actuator maintains reliable valve control even in the event of pneumatic system failure. This dual-drive configuration is particularly suitable for petrochemical, chemical processing and energy applications where reliable emergency valve operation and process safety are critical.
Compact Single-Cylinder Design: The single-cylinder configuration provides a more compact footprint than conventional double-cylinder actuators, while the integrated piping layout reduces installation space requirements. The stainless-steel cylinder housing offers excellent corrosion resistance and pressure durability for demanding industrial environments.
Visible and Adjustable Operating Pressure: Multiple pressure gauges provide real-time monitoring of operating pressure, while the integrated pressure regulator allows the pneumatic output to be adjusted according to application requirements. This makes the actuator suitable for valves with different nominal sizes, pressure ratings and operating torque requirements.
Fast and Easy Mode Switching: The actuator enables quick switching between automatic pneumatic operation and manual hydraulic override without removing or disassembling major components. This allows rapid emergency response when pneumatic power is unavailable. An integrated air receiver tank helps stabilize pressure fluctuations, ensuring smoother actuator movement and minimizing vibration or sudden valve movement.
