Precise flow divider for 700 bar pressure

[Leo Stipisic]

Hello,
can anybody give me an advice where to look for a gear type flow divider (or maybe another design type) for a system that has a maximum operating pressure of a 700 bars (~ 10152 psi).
I have looked but have not been successful, every option I found max out at around 350 bars.

I need a device to equally distribute flow to let's say 4 hydraulic cylinders, at 700 bars of pressure. Voulume (flow) is not so relevant, it is very low).

I found just this kind of system (not sure if I am alloved to put links in thread) :

https://www.lemacher-hydraulik.de/en/products/linear-synchronised-flow-divider

Thank you for help.

 

[Decap]

Leo,

A gear type flow divider is rated for low pressure because of the bearing loads and contamination caused by the high pressure acting on one side of the gear.
A sufficiently high pressure will cause the gear to deflect and run against the metal of the housing, which in turn will cause the internals of the housing to be damaged.
That will introduce contamination in the system and probably cause failures in other components.
Any type of bearing (Journal or Ball) will not be happy with the deflection either, which in turn will wear out the bearings very quickly and generate more contamination.

All that is to say that I do not think that you will find any gear type flow divider with a 700 BAR pressure rating.
Not to mention the potential lockup issues and other application details, like partially independent control, that may mess with the flow divider function.

700 BAR is a high pressure.
If you still want to use a gear type flow divider I would, as others have suggested, try to reduce the pressure by increasing the area of your cylinders.
If you have small cylinders, then this probably would not increase their diameter much (1" to 1.5" bore cylinder area ratio is 2.25, which is sufficient to bring the final required pressure to under 350 BAR, assuming you are using the blind end of the cylinders for the 700 BAR load).

If you want the cylinders to move together, but also be independently controllable, then the easiest way to do so (at 700 BAR) is with electronically controlled valves, a programmed controller, and some position feedback sensors.
It is possible to do so with hydraulically piloted valves, but it will not be as compact, flexible, or accurate as an electronically controlled valve w/ a controller.