VIVOIL OLEODINAMICA VIVOLO

Among the possible teaching ways, to see someone doing something is for sure the most direct.

For this reason we have decided to put on the web some films to show “HOW TO DO”.
For this first VIDEO TRAINING we have chosen an important and frequent activity:
CHANGE THE ROTATION DIRECTION

 

Among the different solutions that we purpose for the flow dividers, the version FLOW DIVIDER + MOTOR is not so well known.

That configuration is usually combined with SINGLE ACTING CYLINDERS, whenever no load is applied during the retracting phase. In those conditions the pressure required to move the flow divider in the starting phase, can’t be supplied by the cylinders and there is the risk that they won’t be able to retract.

The presence of a motor directly connected whit the flow dividers elements, helps to remove the initial resistance to the movement that the flow divider has (mechanical friction), allowing the cylinders retracting phase.

Dimensioning the motor: it depends on the speed that you want to apply to the closing phase.
To keep the same speed on extending and retracting phase, the motor displacement must be equal to the sum of the flow divider elements displacements. In fact in the opening phase the flow rate supplied by the pump goes through the flow dividers elements and the motor is on a by pass state (picks and gives oil to the tank), while in the closing phase the same flow rate feeds the motor. If the displacement is the same, the speed is the same in both movements.

We have even created hybrid solutions (i.e. Group 1 Flow divider + Group 2 Motor), to be able to have a complete solution even for the bigger displacements.

We have to underline that the flow divider + motor requires a bigger initial pressure in the extending phase (depending on the fact that even the motor has to turn).
This bigger initial pressure must be considered in the engineering phase of the plant.

I.E. hereafter the hydraulic scheme of a 3 elements flow divider with motor.

  

Flow dividers are components more complicated than others. The correct understanding of how they work can make the difference between a good installation and a problematic one.

We want to create small simplified guidelines to explain how to choose, use, install, adjust our flow dividers.

 

HOW TO ADJUST RELIEF VALVE ON  FLOW DIVIDERS RV-0S and RV-1S
This series has a single valve that simplifies the adjustment because the valve setting is applied to all the element.

STEP 1 - Place the pressure gauge on the gauge hole.

STEP 2 – Plug one of the flow divider outlets and let the others discharge the flow.

STEP 3 – Remove the protection nut on top of the valve, loosen the locknut and adjust the relief valve turning the screw (imbedded hexagon).

Note: The pressure value has to be 10 – 20 bars lower than the pressure value for the initial opening of the plant security value.

STEP 4 – Tighten the locknut taking care not to move the adjusting screw and close with the top nut. Remove the pressure gauge and plug again the hole.