Re: Open center- Closed center hydraulics

Posted by Bob/Ont on July 10, 2006 at 12:06:10 from (172.144.80.176):

In Reply to: Open center- Closed center hydraulics posted by Mark on July 10, 2006 at 11:06:16:

Mark, open center means the pump flow can go through the center of the valve spool to another spool in series if you have one or back to tank in the Hold Position. When you move the spool the center flow is blocked and the flow sent to the desired port to do some work. If you have two open center valves in series the first one can take all the flow so the second one will not operate at the same time unless it's a special valve with parralell rails to share pump flow. In hold the work ports are blocked and if you have a Float position work ports and pump flow are all connected to tank. This system only needs a Fixed Displacement pump and relief valve.
Closed center Blocks pump flow in hold and many spools can all Share pump flow. This is best when you need to control many circuits/cyls etc. If you have a large flow it will make a lot of heat and waste power with a fixed displacement pump so it usually has a signal system to increase main relief pressure up to working needs when a lever is moved or a variable displacement pump that is opened up to provide needed flow by a similar signal system.
Later Bob

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