Chris_in_Oz
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Is this "Open Centre"?
- Thread starter Chris_in_Oz
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Farmerford
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Chris:
Those hydraulic symbols aren't the standard ones I am familiar with, but they appear to show an open center valve. As Barry said, if it is open center you can easily blow air through the valve from the IN port to the OUT port. Indeed, you can do it with your breath since the center passage should be wide open with the spool centered. Or you can hold the valve with the IN port up and the OUT port down and pour a little oil into the IN port. If it is open center it will quickly run out of the OUT port.
Those hydraulic symbols aren't the standard ones I am familiar with, but they appear to show an open center valve. As Barry said, if it is open center you can easily blow air through the valve from the IN port to the OUT port. Indeed, you can do it with your breath since the center passage should be wide open with the spool centered. Or you can hold the valve with the IN port up and the OUT port down and pour a little oil into the IN port. If it is open center it will quickly run out of the OUT port.
eus
New member
Chris
Watch out ther is now maximum pressure valve .
Be shore wen you mound the valve in a hydraulic system that there is a pressure valve between pump and your valve .
gr Eus
Watch out ther is now maximum pressure valve .
Be shore wen you mound the valve in a hydraulic system that there is a pressure valve between pump and your valve .
gr Eus
63DH8
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Here's a diagram for a two-function, open-center, manually operated directional control valve stack...
It doesn't seem your diagram is of a open center spool.
Not meaning to be a grammar ****, but "centre" is a place where a specified activity takes place. Like the "town centre". "Center" is like "in the middle" or "between two objects". I got that lecture from a well educated Canadian lady friend.
It doesn't seem your diagram is of a open center spool.
Not meaning to be a grammar ****, but "centre" is a place where a specified activity takes place. Like the "town centre". "Center" is like "in the middle" or "between two objects". I got that lecture from a well educated Canadian lady friend.
Mace Canute
Elite Member
This is from Wikipedia...
Center or centre (from the Greek κέντρον /kentron/) spelt "center" in American English and "centre" in British English, Canadian English, Australian English, New Zealand English and other Commonwealth varieties.
Both spellings are correct, depending on location!
Center or centre (from the Greek κέντρον /kentron/) spelt "center" in American English and "centre" in British English, Canadian English, Australian English, New Zealand English and other Commonwealth varieties.
Both spellings are correct, depending on location!
63DH8
Gold Member
- Joined
- Feb 6, 2005
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- Parkland,Washington State, U.S.A.
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- Massey Ferguson GC1725M Bolens TX 1504 (G154) 1957 John Deere 420C crawler
This is from Wikipedia...
Center or centre (from the Greek κέντρον /kentron/) spelt "center" in American English and "centre" in British English, Canadian English, Australian English, New Zealand English and other Commonwealth varieties.
Both spellings are correct, depending on location!
Right! Wiki claimed a picture I took back in 1991 in Iraq was an M-1 tank that was killed by an Iraqi tank in 2005. (someone else took my picture from on-line and posted it as theirs.) I had the negative to prove the post was wrong. They pulled the picture and post with-in minutes. Don't trust wiki! While they are correct most of the time, they are not exactly in the first place when it comes to facts. Wiki depends on people's submissions and corrections.
That Canadian friend of mine taught English in Vancouver, BC. Then again, people are fallible. We're not perfect, so she could be wrong.
BlacknTan
Platinum Member
Compressed air thru "IN" comes out "BEYOND" in my valve.
westcliffe01
Veteran Member
Your valve looks fine to me. From the diagram it has a 3rd port that you may want to plug on both sides if you are using regular double acting cylinders.
I find the description "open center" a bit hard to understand except that I guess they mean that the supply side is "open" or really "bypassed". The benefit of this design is that it draws the least amount of power from the pump when idle and generates the least heat in the hydraulic circut. It also means that the whole system should run quieter when idle. The system pressure is ultimately determined by the actual load applied, up to the limit set by the pressure regulator. Any time the load requires less force than set by the pressure regulator, system pressure will be less than the limit.
I find the description "open center" a bit hard to understand except that I guess they mean that the supply side is "open" or really "bypassed". The benefit of this design is that it draws the least amount of power from the pump when idle and generates the least heat in the hydraulic circut. It also means that the whole system should run quieter when idle. The system pressure is ultimately determined by the actual load applied, up to the limit set by the pressure regulator. Any time the load requires less force than set by the pressure regulator, system pressure will be less than the limit.