The HVRS and HVRD line of single and double vane hydraulic actuators were developed to be servo-quality actuators, capable of achieving extreme torque and superior hydraulic stiffness. Due to a very low friction-to-torque ratio, axes using these actuators have been able to achieve arc-second positioning accuracy. An additional benefit of these actuators is a high torque-to-weight ratio which stems from their historical application on multi-axis dynamic motion tables. The large load capacities of the integrated bearings allow for no additional axis bearings in most applications. Ideal actuators are designed to provide precision performance and reliable operation with only minimal preventative maintenance.