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      HAWE Hydraulik SE
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      Sensitively accelerating and lowering loading cranes

      7/26/2014

      Exacting the fine control range for jerk-free hydraulic actuation

      The valves of HAWE Hydraulik SE, Munich, enable very fine and jerk-free movements of loading or forwarder cranes, as the company has developed specially designed spool valve pistons for its proportional directional spool valves. These valves continuously and variably control the velocity of the crane movements irrespective of the loads. To select the matching type of spool, the hydraulics specialists coordinate closely with the customer to determine the necessary counter pressures for sensitive acceleration and deceleration of the crane.

      Accordingly, the valves are fitted with a spool valve piston that is fine tuned to the application's cylinder parameters and that contains an exactly defined fine-control zone, which allows the operator to handle the tree trunks as easily and conveniently as possible. The modular product kit offers numerous types of spool valves for a wide range of pressure ratios.

      Moreover, special spool valve pistons with regenerative functions for lifting the articulated arm and extracting the telescope help to improve the energy balance of the vehicle. Thus, the oil from the rod end is co-used when the cylinder is extracted. Instead of feeding it back to the tank it is channeled directly to the piston end so that the pump has to supply only a small residual amount.

      The regenerative spool valve piston reduces the hydraulic consumer's volume flow demand. This makes the hydraulic system not only energy-efficient but also protects it against oil shortage. Valves with regenerative spool valve pistons are therefore particularly suitable for hydraulic systems using small pumps and cylinders with large piston area ratios.

      Related Exhibition:
      Interforst 2014
      Trade Fair for Forestry and Forest Technology
      7/16/2014 - 7/20/2014
      Venue: Messe München, Munich, Germany

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