Linear actuators consist of a piston and rod that move within a cylinder. The cylinder has two hydraulic ports; one for extension of the piston and rod and one port for retraction. When hydraulic fluid is directed to the extension port of the actuator, the piston moves to extend the rod out of the cylinder. When hydraulic fluid is directed to the retract port, the piston moves to retract the rod into the cylinder.

The cylinder is “pinned” in two places, one fixed point and one translational point. As the piston rod extends and retracts, the translating point moves with it, providing motion control to accomplish tasks such as deploying thrust reversers or opening and closing doors.

Actuators can be outfitted with locking mechanisms designed to hold the actuator in a desired position. This aids functionality and safety of the actuator. Parker has the capability to design an entire actuation system to meet your project requirements.

Actuation systems incorporate all the necessary elements to keep a system clean and controlled, including filters, valving, and hydraulic lines. Multi-actuator systems, such as those required for thrust reverser applications, can also be synchronized using a shaft and worm gear system which ensures the system works together smoothly and safely.

With both system and individual actuator offerings, Parker Hydraulics Systems Division has the capability to provide linear actuators and actuation systems for thrust reverser, steering, and door applications. In addition to our existing units, the Parker product development team has the skill set and engineering tools to custom design an actuation solution that will meet your specific application requirements. Please contact us to see how we can engineer a solution for your application.

APPLICATIONS:   
Provides motion control for a variety of applications in many of today’s leading military and commercial aircraft including:
 • Boeing 747, 757, 767, and 777
 • C-5
 • C-17
 • Airbus A330 and A340
 • Cessna Bravo and Excel
 • Hawker Horizon
 • Gulfstream G650
• Embraer Legacy 450/500

Parker HSD linear actuators and actuation systems have been employed in applications such as:
 • Thrust-reverser systems
 • Main landing gear steering
 • Landing gear retraction
 • Door operation
Contact Parker Hydraulic Systems Division to determine if our linear actuators are a good solution to your specific application.

Parker HSD can provide locks to hold an actuator in a desired position. The following locking mechanisms are available:
 • Retracted position only
      - Poker chip lock
      - Finger lock
 • Any position
      - Segmented lock

FEATURES AND ATTRIBUTES:  
• Parker linear actuators have been designed to operate routinely in both 3,000 psi and 5,000 psi hydraulic systems
• Extend and retract output force, the force needed to move the desired object, up to 35,000 lbs
• Parker actuators can be designed to operate in phosphate ester-based or hydrocarbon-based (MILPRF- 87257, 83282, 5606) hydraulic fluids
• Can be designed to perform in temperatures as low as -65 °F and as high as 275 °F
• Parker proprietary poker chip locks provide reliable safety mechanisms
• Regenerative designs available for low flow situations

OPTIONAL FEATURES:  
Parker HSD can provide a system solution for your actuation needs. A system may include:
 • Filtration
 • Isolation valves
 • Check valves
 • Directional control valves
 • Hydraulic tubes and lines
 • Synchronization capability