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  • Electrohydraulic Actuators
    . By combining a stepping motor, servovalve, cylinder, and ball screw, positioning accuracy of 0.001 to 0.002 in. and repeatability of 0.0005 in. are possible. Stepping-motor rotation moves a cam to shift the valve spool laterally. This permits oil flow to the cylinder. As the cylinder piston moves, the ballnut
  • Making Sense of Electrohydraulic Controllers
    Here's how to match controller to machine for top-notch performance without overpaying. Bosch Rexroth Corp. Industrial Hydraulics To download a free guidebook on electrohydraulic controllers and proportional valves visit Machine builders and equipment operators sometimes have misconceptions about
  • Dissecting high-performance electrohydraulic valves
    Things aren't black and white when choosing a servo or proportional valve. Servo and servoproportional valves control pressure or flow and are selected based on application. Proportional and servovalves control flow or pressure via a sliding spool element. First-stage configurations for nozzle
  • Digital valves raise machine performance, not cost
    Electrohydraulic poppet valves overcome the limitations of spool valves. Incova technology debuted at the recent CONEXPO show on John Deere's 410H backhoe. The machine's Total Machine Control system integrates control of all systems for the best productivity in every application. It features
  • Proportional Valves
    The performance of proportional valves falls in the wide spectrum between on/off solenoid valves and electrohydraulic servovalves. The valves are termed proportional because output flow is not exactly linear in relation to input current. Despite their nonlinear response, the valves
  • Guidelines for sizing servohydraulics
    The best controllers and software can't overcome a poorly designed hydraulic system. In typical servohydraulic motion systems, the valve mounts as close as possible to the cylinder. Experts also recommend motion controllers specifically designed for hydraulic applications. Cylinder-bore size
  • Compact pumps offer higher flow
    noise levels, Sauer-Danfoss used analytical tools to optimize valve-plate performance (torque and pressure ripple) to reach the best noise level. A single-piece housing assembly maximizes housing strength, reduces stress points, requires less machining and fewer parts, increases rigidity
  • Cutting curves, not corners
    . The integrated axis controller assembly is geared to harsh environments typical of the wood industry. It features robust digital electronics, a dynamic control valve proven in the wood-processing industry, and a digital position-measuring system protected inside the cylinder. VT-HACD controllers permit

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