Open or closed center?

[250quality]

Back to the hydraulic drawing board. So I changed the pump on my processor to a 15 gal a minute pump. When I tried to start it (24hp onan) it would hardly turn over cause of pressure built up on hydraulics. If you pull any hydraulic lever it would start fine. I changed the valve bank to a big ol 6 spool Parker I had and the problem went away. This valve is leaking bad now and needs retired as I had it rebuilt with no luck. I want to put on a 3 spool with power beyond and an auto cycle valve down stream for the splitter.
Am I going to have the same problem as I did with the first valve or is this where open and closed centers come into the mix? Alot of cash to put out if I have the same problem again.
Thanks to all.
Brian

 

[art]

I think that is what you are up against. Did it build a lot of heat when it was running>?

 

[J_J]

An open center hyd system normally has a gear pump that pumps continuously.

The fluid must flow through all open center valves and back to tank.

If you block this flow, something is going to burst. Relief valves can handle some of the pressure.

In general, you can not mix open and closed center valves, but some valves have adapters that will allow the valve to be an open center or closed center valve.

 

[250quality]

Makes perfect sense to me. Will continue on my hydraulic journey. Getting a collection of valves, pumps and motors now. May have to build something else when the bugs are out of my processor.
Thanks JJ

 

[J_J]

When you collect hyd components, you need to know the functions of whatever you are collecting. Things like GPM's, pressure limits, hyd motor size, etc.

It is kind of hard to put something together with what you have, not knowing the potential of the parts.

However, if you draw up a plan and know what the end product should do, then you look for specific components. Matching up the valves with the type hyd system you want, hyd flow in GPM's, speed of operation, pressure limits, hose size, selecting filter, etc.

If you do a search on TBN, using certain words to search for, you will find a lot of data that may help you understand more things in detail. You can always ask more questions.

It would make a grown man cry or curse loudly to see a $700 set of valves blow up when the system is activated, simply because inappropriate logic was used.

I think we all have done something similar, not knowing the end results, but hoping for the best.