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...
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.
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...
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.
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...
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...
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...
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...
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...
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...
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...
A diagram, photos or Danfoss pump/motor/block references would allow you to calculate this.
At Hagglunds the Vicking engines have a large internal leak and good mechanical performance. Marathon engines have low leakage and good mechanical performance. Compact motors have little leakage but a...
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...
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...
