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  1. 73lafuite

    Hydraulic motors in series Problem!

    .....https://files.engineering.com/getfile.aspx?folder=1926d4d5-e55b-4e5e-a5ab-09a17febca81&file=afac.JPG
  2. 73lafuite

    Hydraulic motors in series Problem!

    Hello, Externally piloted sequence valves are not available from all suppliers. But a counterbalance valve would do the job. It is available everywhere and at a fair price. Take a low ratio if...
  3. 73lafuite

    Hydraulic motors in series Problem!

    Try putting a check valve set to 5 bar on the collector of your 4 drains? Could this re-enter through the internal valves of the 4 motors? Without having a big influence on the life of the shaft seals.
  4. 73lafuite

    Hydraulic motors in series Problem!

    sequence valve with internal drain and external piloting
  5. 73lafuite

    Hydraulic motors in series Problem!

    If a back pressure at the outlet of the 4th motor solves the pulsation problem: then it is enough to put a sequence valve with internal drin and external piloting. And connect the piloting to the upstream inlet of the 1st motor. Thus optimal efficiency during work and only losses when there is...
  6. 73lafuite

    Hydraulic motors in series Problem!

    Hello, to have a correct life of your shaft seals it is desirable to put an external drain on the first 3 motors. Maybe this will prevent having a pressure wave which produces a small variable torque on the shafts or even a detachment of the distribution glass.
  7. 73lafuite

    Hydraulic oil cooler "net"

    You must reverse the direction of rotation for example for 5 seconds every 10 minutes.
  8. 73lafuite

    Hydraulic Motor Power Confusion

    Good morning, The error is that the motor speed is 360/355*1500RPM=1521RPM
  9. 73lafuite

    Solenoid valve symbology: detented coil on a two-position single-coil spring-return valve?

    It is quite simply a 4/2 solenoid valve, arrows crossed at rest, parallel arrows energized, with a closed transfer.
  10. 73lafuite

    Cetop Valve Not Changing Motor Direction

    Hello, Also check with the manual pushers and or by disconnecting the Hirschmann plugs that the correct coil is powered and that there are never 2 coils powered at the same time. I always told my automation engineers that they were less reliable than hydraulic engineers...
  11. 73lafuite

    Cetop Valve Not Changing Motor Direction

    I would disassemble the distributor from its base plate. And I would puff with a cigarette or compressed air while operating the spool. If air always exits from the same side then the spool in the valve is an asymmetrical 4/2 valve spool. Normally with a completely open center the springs...
  12. 73lafuite

    Cetop Valve Not Changing Motor Direction

    Hello, Your story seems impossible. When you have found the solution to the problem I will have learned a little more. Just an idea: the motor should have a 3rd drain port. Otherwise it must have 2 check valves inside which evacuate internal leaks towards the orifice which has the lowest...
  13. 73lafuite

    Small Hydraulic Proportional Valve

    Hello, It's easy to regulate the hydraulic pressure. If you gave more details on the current hydraulic circuit and on the brake, the answer would obviously be more appropriate. If currently your pump runs constantly and it does not heat the oil too much: then you are using a proportional...
  14. 73lafuite

    Suction Filter Sizing

    Hello, I understand your application better. It seems to me that the Rexroth A10Vs do not go up to 360cm3/t. Parker makes a 360cm3/t PV pump. But this pump could not work at 1800RPM and 100% flow rate if suction pressure is same as crankcase pressure. Only at 95% of max flow. Personally using...
  15. 73lafuite

    Suction Filter Sizing

    Hello, Is your installation working? Or is it a project? A 360 cm3/t open circuit pump is not recommended when there is only one hydraulic motor to drive. As my colleagues indicate, you should not put a filter on the suction, but in addition you must take constructive measures to guarantee a...
  16. 73lafuite

    Hydraulic Cylinder Piston Failure

    Hello, If you have a tight circuit when you open the brake: so a reed valve or something like that and your piston goes to a stop when you open the brake. So you should know that the pressure increases by 10bar when the temperature increases by 1°C. If the temperature increases by 20°C then the...
  17. 73lafuite

    Dissipation of heat from hydraulic systems

    ...what I understand your Load sensing pump delivers 10/15 bar more than the engine pressure. In this case the power lost in the Danfoss block is 10bar*30l/mn/600=0.5kW. The power lost at the pump is around 30l/min x125bar/600 x15% = 0.9kW. The power lost in the Hagglunds engine depends a lot on...
  18. 73lafuite

    Dissipation of heat from hydraulic systems

    Hello, Any hydraulic power (flow x pressure) that is not transformed into mechanical power (force x speed) is transformed into oil heating. A pressure drop of 100bar in a component without producing mechanical energy (flow limiter or pressure reducer or pressure limiter etc.) produces a...
  19. 73lafuite

    Purging Air From Light Aircraft Hydraulic Systems

    Hello, If there is air at start-up in a cylinder: it dissolves in the oil which comes from the pump when the pressure increases. Then when the oil returns to the reservoir the pressure in the fluid becomes zero. Then the air rises to the surface in the tank. Phenomenon of the coca cola bottle...
  20. 73lafuite

    What is this valve?

    If the line on the training square is parallel to the pipes: it is open

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