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About Hydraulic Rotary Actuators

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Hydraulic rotary actuators use a pressurized, incompressible fluid to rotate mechanical components. They are faster and more powerful than pneumatic actuators because the high pressures used in hydraulic systems produce greater torque. Hydraulic rotary actuators use two types of rotational elements: circular shafts and tables. Typically, circular shafts include a keyway while tables include a bolt pattern for mounting other components. Single-shaft devices provide an output on only one side of the actuator. Double-shaft devices provide outputs on both sides of the actuator. To convert linear motion into shaft rotation, helical spline teeth on the shaft engage matching splines on the inside diameter of a piston. As hydraulic pressure is applied, the piston is displaced axially within the housing and the splines cause the shaft to rotate. When a control valve is closed, hydraulic fluid is trapped inside the housing and the shaft is locked in place. Single-piston devices drive a rack that rotates the pinion. Double-piston and four-piston devices drive racks on both sides of the pinion. Single-chamber and double-chamber rotary vanes that are actuated by pressurized air are also available. 

Performance specifications for hydraulic rotary actuators include operating pressure range, maximum torque, load capacity, linear stroke, operating temperature, and rotation angle. Maximum torque is the required range of torque output. There are two types of load capacity: axial load capacity and radial load capacity. Axial load capacity is the required axial or thrust load capacity of the output shaft or table. Radial load capacity is the required radial load capacity of the output shaft or table. Linear stroke, another important specification, is the travel distance between the fully retracted and fully extended rod positions. Operating temperature is a full-required range. Rotation angle is the degree to which the actuator can rotate before reaching its travel limit. Typically, hydraulic rotary actuators provide a maximum rotation angle of 45°, 90°, 135°, 180°, 225°, 270°, 315°, or 360°. Angles can be adjusted via screws on one side, or on both ends of the angular stroke. Actuators such as true rotary indexers allow multiple position stops along strokes. 


Products & Services Related to Hydraulic Rotary Actuators
Electric Rotary Actuators
Electric rotary actuators drive components rotationally via electromagnetic power. They typically have control and indexing capabilities.
Pneumatic Rotary Actuators
Pneumatic rotary actuators use pressurized air to rotate mechanical components.

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Engineering Web: Hydraulic Rotary Actuators
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Hydraulic Rotary Actuators
BROWSE BY CATEGORY > Actuators/Valves > Actuators.  VIEW ALL SUPPLIERS OF Actuators/Valves > Actuators > Hydraulic Rotary Actuators.  . EMAIL INQUIRY to.   8 hydraulic rotary actuators suppliers  . ...
Hydraulic Rotary Actuator Selection Guide - Helac Corporation
... hydraulic rotary actuator to meet our customers' unique application requirements.. The L-Series rotary actuators offer large diameter drilled and tapped shaft flanges and integral, composition ...
See Helac Corporation Profile & Catalog
HYD Rot Actuator
Hydraulic rotary actuators. from Parker Actuator Division are used where high-speed, controlled, or repetitive motions are performed. Our actuators open and close molding machines, execute welding-frame ...
Hydraulic Rotary Actuators Automation Catalog 1800/USA 41 Parker Hannifin ...
... Rotary Actuators. Subhead. Selection Guide. Introduction. A rack and pinion rotary actuator consists of a housing with. How to Use. bearings, a rack and pinion gear rotary group and hydraulic. These ...
See Parker Hannifin Corporation Information
Industrial Hydraulic Components & Systems (Parker Online Catalog)
HTR Series Hydraulic Rack and Pinion Rotary .... LTR Series Light Duty Hydraulic Rack and Pi .... M Series Heavy Duty Mill Rotary Actuators.  .    . Industrial Hydraulic Components & Systems 1-800-C-Parker ...

Part Numbers for Hydraulic Rotary Actuators

Part # Distributor Manufacturer Product Category Description
11CDQSB2015DF9NV PLC Radwell SMC Not Provided ACTUATOR, ROTARY, HYDRAULIC
CDRA1LSH50100 PLC Radwell SMC Not Provided ACTUATOR, ROTARY, HYDRAULIC
See more product announcements for Hydraulic Rotary Actuators
Magnetically coupled cylinders save space

Magnetically coupled cylinders save space
SMC Corporation of America


T20 Series Helical, Hydraulic Rotary Actuators

T20 Series Helical, Hydraulic Rotary Actuators
Helac Corporation


L10 Series Helical, Hydraulic Rotary Actuators

L10 Series Helical, Hydraulic Rotary Actuators
Helac Corporation


11 See more product announcements for Hydraulic Rotary Actuators

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