When changing the game comes down to the valve

  • gremo
  • When Swedish forestry machine manufacturer Gremo agreed to put the innovative Danfoss PVX proportional valve to the test on its forwarder machine, it did not take long for the valve to prove why it is an industry-changing addition to mobile machine technology. By simply changing the hydraulic valve on their forestry crane to the new Danfoss PVX, Gremo has seen productivity go up, and fuel consumption go down.

    Built to withstand
    The forwarders used to cut, collect and load trees onto a trailer in Sweden’s 28 million hectares (69.19 million acres) must be robust and able to withstand the challenges of their tough working environment.

    After spending more than 6,000 hours in the field testing the PVX on this and four other machines, it was proven that the PVX is very robust and can handle the harsh conditions.

    Integrated versatility
    Designed as a sectional, two-spool valve, the PVX can support up to 12 different functions with a maximum pressure of 420 bar [6,092 psi] and 180 l/min [47.5 gpm] work port flow. All it takes is a swift adjustment of the electronic settings to adapt the valve characteristics to work function needs.

    Cooling efficiently
    A long-time Gremo customer in northern Sweden, Kapah Forest AB, ran one of the forwarders used for the field test. Experienced driver, Stefan Jusslin, noted the fuel efficiency and the array of useful data conveyed from the integrated pressure and temperature sensors via the CAN bus to the display.

    “The on-board computer registers everything so we know how much fuel we use per cubic meter of timber. Our machine is running cooler and saving a lot of fuel,” he said. “The crane is also more precise and runs more smoothly. As a result, cabin vibration is reduced so the operator is sharper and more effective. That is a big win.”

    Better than conventional
    Comparative tests of the PVX and conventional valves measured a 16 percent increase in productivity and fuel savings of 25 percent on the crane duty cycle. These efficiency improvements can be attributed to smart metering, minimized back-pressure and variable load-sensing margin control. An adaptive energy regeneration function is also available to optimize system efficiency by detecting opportunities for flow and energy regeneration.

    Detailed data
    Machine design engineers can easily use the spool position data and the pressure and temperature data registered by the integrated sensors to determine the relationship between work functions, oil flow demand and the load size. Using this data, the valve can be programmed to perform the same task repeatedly.

    Simplified system
    When the load on the crane shifts as cut trees are lifted and moved to the trailer, an active dampening feature maintains stability without the need for accumulators and associated hosing. By reducing the number of parts, servicing the simplified system becomes easier, and more economical.

     

  • Gremo

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