Re: Open center- Closed center hydraulics

Posted by Vern-MI on July 10, 2006 at 11:39:27 from (207.69.137.14):

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

Typically the directional valves have a pressure port, a tank or return port, a port "A", and a port "B". When a three position valve is open center design it means that in the center position of the spool travel all ports are connectd together and the pressure flows to the point of least resistance or all ports are at equilibrium and the oil is being drained back to the reservoir. In a closed center valve when the valve spool is in the center position all of the ports are blocked including the pressure, return and Port A & B.

When the valve is open center and the spool is in the center position the pump runs at low pressure and therefore cannot be used by any service port for other tasks.

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