J_J
Super Star Member
- Joined
- Sep 6, 2003
- Messages
- 18,928
- Location
- JACKSONVILLE, FL
- Tractor
- Power-Trac 1445, KUBOTA B-9200HST
Circuit Considerations for Control Valves with more then One Spool
A) Open Center System with a Series Connection: Oil from the pump is directed to the multiple spools connected in Series. In the Neutral Position the oil passes through the valve in series and returns to the reservoir. When the control is operated, the oil is directed to the device that the valve serves. Return oil from the device is directed through the return line of the next valve.
NOTE: This circuit is satisfactory as long as only one valve needs to function at a time.
B) OpenCenter Systems with a Series/Parallel Connection: Oil from the pump is directed through the control valves in series, as well as in parallel. In Neutral, the oil passes through the valves in series. However when any valve is operating, the return is closed and the oil is available to all the valves through the parallel connection.
NOTE: When (2) or more valves are operated at once, the device that requires the least pressure will operate first, then the next device and so on.
NOTE: The advantage of this circuit is the ability to operate (2) or more valves simultaneously over the series connection.
A) Open Center System with a Series Connection: Oil from the pump is directed to the multiple spools connected in Series. In the Neutral Position the oil passes through the valve in series and returns to the reservoir. When the control is operated, the oil is directed to the device that the valve serves. Return oil from the device is directed through the return line of the next valve.
NOTE: This circuit is satisfactory as long as only one valve needs to function at a time.
B) OpenCenter Systems with a Series/Parallel Connection: Oil from the pump is directed through the control valves in series, as well as in parallel. In Neutral, the oil passes through the valves in series. However when any valve is operating, the return is closed and the oil is available to all the valves through the parallel connection.
NOTE: When (2) or more valves are operated at once, the device that requires the least pressure will operate first, then the next device and so on.
NOTE: The advantage of this circuit is the ability to operate (2) or more valves simultaneously over the series connection.
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