Hey guys, I am looking to steer a John Deere 9520 tractor hydraulically and need a 60lpm closed center load sensing steering valve. Are there any options out there that don’t require the flow to go through the valve? ie… don’t have a pressure in and Exhaust Flow EF out?
The tractor steering orbital is 95-151lpm.
Thanks
I just got done looking for a 60L valve for my open center system. Thats basically impossible to find. What I ended up doing is buying this valve. It’s a closed center LS valve, and I just bought a LS priority valve to go in front of it.
The valve is an Eaton Vickers style, or some call it “Trimble style” valve. Ironically, this particular one is branded as an Ag Leader valve with an Ag Leader part #.
Part #: 500-0016-04. You can get it from Hoober’s website, however it is special order so you may have to call and tell them you want it.
OK, thanks mate, I have been having the same issue to be honest. I will look into this.
Did you checkout baraki’s valve:
Unfortunately the 60L valves that baraki sells aren’t actually a full 60L flow rate. The 30L and 60L use the same proportional valve. The lock out valves are the difference.
So theoretically I guess the 60L valve could flow just a hair more since it has less restrictions with the bigger lockout valves. However at the end of the day, it’s still just a 30L flow rate on the proportional valve itself.
This was the problem I ran into on my project. If his valve would’ve been big enough I would have gotten it, then just put a LS priority valve in front of it. (Since my system was OC). The only reason I went with the valve I did is because it is dang near impossible to find a true 60L valve on the aftermarket. You pretty much have to go with the OEM’s to get a big enough one.
Thanks again, I am running into the same issues. Looking more and more like OEM is the only way here.
There are other alternatives.
Walvoil have some prop valves.
I was looking at the SDX060 with spools from 5 to 35L/m but there are bigger series available.
You are right about the theoretical values. But on the other hand many systems require reducing pressure or flow to prohibit too fast reactions in autosteer. The 60 L lock valves is required when steering manually, but the 30 l proportional valve might be better, to avoid too fast movements when going straight.
It is not blocking at 30 l, but yes flow resistance will be higher above 30 l (could be when doing U-turn where it might want to go full lock to full lock very fast)
A 60 l proportional valve could be difficult to control the PWM, so it does not feed too much oil in the low liter demand spectre) Which I believe is the reason for still using 30 L proportional in the LS blocks from Baraki
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The 30L valve won’t be able to keep up in an Auto-U-Turn situation, which is one very big benefit to running the AOG system . The proportional valve on this Eaton Vickers style valve is actually 13.2 gpm (50L), and has lockout valves just like the Baraki valve. The flow through the lockout valve is WAY more than 60L. So if a guy has a 4WD articulated tractor with a big steering system, this may be the valve for him. (That is until Baraki or maybe someone else begins making a large steering valve) The problem is this, large 4WD articulated tractors take a lot of flow. In no world is a 30L valve going to have satisfactory performance in line acquisition. Once it’s on the line, it will probably do just fine. As soon as Baraki starts offering a, let’s say, 90L valve block with a 50L proportional valve… I’m going to be the very first in line to buy it. I have other 4WD tractors that I’d love to put systems in, but I can only do one at a time if I have to pay the price of the OEM’s.
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