Difference between pre, post and no compensation in hydraulics circuit

07/10/2018

Hi everyone 🙂

 

Today I am going to share with you something that I have recently mastered and spent over a week trying to understand all the aspects connected with this phenomena. The thing that I am talking about is called pre and post compensation.

 

I have prepared a short video with an explanation how it works. I think that it is the best way to explain it. As I wrote before, it took me couple of days to understand how to play with valves parameters to achieve what I had wanted to. I highly recommend designing the circuit by yourself because this is how you are going to find out that it is not as easy as it seems 🙂

 

I recommend watching it on full screen by pressing the icon in the lower right corner.

 

 

 

Quickly about no-compensation:

– When we achieve saturation (the flow that our actuators demand is higher than the flow that pump can supply), flow is send to the function with lower load. Because of that it is important to remember that because saturation may lead to situation when more important function will stop working correctly and might lead to accident. We achieve saturation very quickly.

–  Before saturation (the flow that our actuators demand is lower than the flow that pump can supply), we can see that RPM on our motors is is different due to different load on them and no compensation.

 

Quickly about pre-compensation:

– When we achieve saturation (the flow that our actuators demand is higher than the flow that pump can supply), flow is send to the function with lower load. Because of that it is important to remember that because saturation may lead to situation when more important function will stop working correctly and might lead to accident.

–  Before saturation, we can see that RPM on our motors is practically the same, even thought, load on both motors is different.

– Pre-compensation is also used as an priority flow share. It means that when we combine it with post-compensation we will notice that after saturation flow will go to pre-compensated function which is prioritized.

– To avoid saturation you can oversize the pump, so it will provide enough flow in every situation. The problem is that you will spend more money on equipment and energy.

 

Quickly about post-compensation:

– When we achieve saturation (the flow that our actuators demand is higher than the flow that pump can supply), flow is shared proportionally to every function. Due to this you can be sure that none of the function will stop working.

 – Before saturation, we can see that RPM on our motors is practically the same, even thought, load on both motors is different.

 

 

Thanks very much for visiting, I hope that you enjoyed and found it interesting 🙂

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