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Crank-Arm Piston Actuator – Spring-Return

Crank-Arm Piston Actuator – Spring-Return
  • Air Supply Pressure: 0.4–0.8 MPa
  • Actuation Mode: Pneumatic
  • Rotation Angle: 0°–90°
  • Action: Double-Acting (Fail-in-Place, FL) + Single-Acting (Fail-Close, FC / Fail-Open, FO)
  • Available Accessories: Valve Positioner, Solenoid Valve, Limit Switch, Air Filter Regulator
  • Actuator Body Materials: WCB, SS304, SS316L
  • Ambient Temperature: -40°C to +180°C
  • Air Supply: Clean, dry, filtered or lubricated air; non-corrosive gases
  • Compatible Valve Types: Ball Valves, Butterfly Valves and other quarter-turn / rotary valves
For technical drawings and 3-D models, click on a part number.

Product details

The XLX Single-Acting Crank-Arm Piston Pneumatic Actuator is a spring-return pneumatic actuator designed for reliable fail-safe automation of quarter-turn valves. It uses a piston and crank-arm transmission mechanism to convert the linear force generated by compressed air into 90° rotary output torque. When the air supply is interrupted, the integrated spring assembly automatically returns the actuator to its preset safety position, providing Fail-Close (FC) or Fail-Open (FO) operation.

XLX Single-Acting Crank-Arm Pneumatic Actuator – Working Principle
Normal Operation: Compressed air enters the cylinder and drives the piston against the spring force. The piston moves linearly and transfers its thrust through the connecting rod and crank-arm mechanism, rotating the output shaft to open or close the valve.

Air Failure: When the air supply is interrupted, the preloaded springs release their stored energy and drive the piston back to its original position. The output shaft automatically rotates to the preset fail-safe position, helping meet process safety interlock requirements.

 

Product Specifications

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）

Crank-Arm Piston Actuator – Spring-Return

SizePart NoLL1HH1ZXYMaBMbdhG-NPT
XLS45XLS45-100S620 465 124 64 26 80 30 M670 4-M81651/4
XLXS45XLXS45-100S600 445 124 64 26 80 30 M670 4-M82061/4
XLS55XLS55-125S750 586 129 67 26 80 30 M6102 4-M102061/4
XLXS55XLXS55-125S694 530 129 67 26 80 30 M6102 4-M102581/4
XLS63XLS63-160S910 710 164 83 26 130 30 M6125 4-M1230/358/103/8
XLXS63XLXS63-160S855 655 164 83 26 130 30 M6125 4-M1230/358/103/8
XLS63XLS63-200S930 730 164 83 26 130 30 M6125 4-M1235/4010/123/8
XLXS63XLXS63-200S865 665 164 83 26 130 30 M6125 4-M1235/4010/123/8
XLS80XLS80-250S1120 883 198 100 26 130 30 M6140 4-M1640/4512/143/8
XLXS80XLXS80-250S1070 833 198 100 26 130 30 M6140 4-M1645/5014/163/8
XLS80XLS80-300S1180 940 198 100 26 130 30 M6140 4-M1650/5514/163/8
XLXS80XLXS80-300S1100 860 198 100 26 130 30 M6140 4-M1655/6016/143/8
XLS100XLS100-300S1360 1065 251 125 26 130 30 M6165 4-M2050183/8
XLXS100XLXS100-300S1260 965 251 125 26 130 30 M6165 4-M2060183/8
XLS125XLS125-300S1750 1360 300 147 26 130 30 M6254 8-M1660/7018/203/8
XLXS125XLXS125-300S1600 1210 300 147 26 130 30 M6254 8-M1670/8020/223/8
XLS125XLS125-350S1770 1380 300 147 26 130 30 M6254 8-M1680/9022/251/2
XLXS125XLXS125-350S1620 1230 300 147 26 130 30 M6254 8-M1690/10025/281/2

Crank-Arm Piston Pneumatic Actuator – Key Advantages
High Rotation Accuracy：High-precision bearings and adjustable travel stops ensure accurate and stable valve positioning, with 0° and 90° positions adjustable within ±10°.

Long Service Life & High Durability：Wear-resistant cylinder surfaces, hard-chrome-plated piston rods, guide rings and dual sealing provide excellent durability and reliable long-term operation.

High Strength & Impact Resistance：The integrally cast crank-arm mechanism provides high structural strength, excellent stability and strong resistance to mechanical impact.

Variable-Torque Output & Fast Response：High breakaway torque at the initial stroke helps overcome valve static friction, while compatible pneumatic accessories enable fast valve opening and closing.

Flexible Configuration & Safe Operation：Multiple cylinder and gearbox combinations provide a wide torque range for different valve sizes and operating conditions. Single-acting models feature spring ejection protection for enhanced maintenance safety.