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Pwr steering using priority valve

R

Rex in Australia

Member
Hi Guys, looking at hooking up power steering on the little 434 now that it has a loader on it.
I"d like to use the original pumping set up and believe it is possible using a priority valve.
Question, would the main pressure line from the pump be cut and taken to the priority valve, then split through the valve, with the steering feed going through it"s own relief valve between the priority and ram, and the other feed going back to the original main hydraulic feed line?
Hope that makes sense, and Thanks!
Rex
 
You have it right. The pump flow needs to go to the priority valve first. The power steering circuit would be hooked the the port that has "priority" and the loader/current hydraulics would be hooked to the return or priority dump port. This way the steering has superior priority over the lift or loader.
 
Output of the pump goes directly to the input of the priority valve. The "exhaust" port of the priority valve is then routed to the original system.

The return line of the power steering will just dump into the tank.

Allan
 
NOT sure what"s available where you are, but many priority flow dividers intended for steering use have an internal relief valve, thereby eliminating an extra component, and it"s associated plumbing.
ONE type
 
I added power steering to a 450 Farmall some years ago. We cut the pressure pipe from the live hydraulic pump and brazed on female pipe couplings. We mounted an adjustable flow divider to the frame and hooked the inlet and non controlled port of the flow divider using hydraulic hoses. We ran the controlled port to the power steering unit with the power steering return flow back to the hyd resovour. Adjusting the controlled port of the flow divider just enough to give the minimum accepetable power steering speed leaves the maximum flow avalible for the front end loader. This setup has worked fine for over 20 years.
Flow divider.
 
Rex I am not going to chime in but you got your answer from THREE of the best on this board. You want the priority valve that does not require the separate relief or third line. One word of caution get one that is large enough to flow the needs of the system or the output of the pump. You do not want to loose work (pressure & flow).
 
I hope you are a person who enjoys a fine cigar. Not trying to be a wiseguy, but when you take about 4-6gpm. from your tractor's hydraulic pump, that doesn't leave too much for your loader; thus you will have time to enjoy several puffs while the loader raises or lowers. We had a fellow on the Case forum last week, who was trying to do the same. Once he got the PS functioning satisfactory, he was extreamly disapointed with his remote and 3pt. performance on his 930 Case which had a 15gpm. pump. The 930's had a belt driven PS pump on them, that he was looking to eliminate. I don't know what your gpm is, but, I bet it is less.
Loren, the Acg.
 
With a flow divider valve you reduce the hydraulic flow to the loader all of the time. Example: You have a 10 gpm system. Your steering unit uses 3 gpm when working. So with a flow divider you would have 3 gpm going to the steering at all times even when you where not steering. So the loader would only have the 7 gpm that was left. You would need a relief valve in the steering circuit to dump the flow when the steering unit was not using oil.

With a priority valve the steering unit would be able to draw the flow it needed when it needed it but the rest of the time the full oil flow would go to the loader. So if you use my example numbers, you would have the 10 gpm all of the time unless you where steering. Also you would not need a relief valve in the steering circuit as the excess flow would go to the loader/current system when the steering was not being used.
 
If you use a priority valve then you would only lose the oil flow while steering. If you use a flow divider valve then you lose the flow all of the time.


I bet that the Case guy used a flow valve not a priority valve.

Even with the priority valve the loader will be slower when steering. It would be better to have a dedicated power steering pump or a high GPM hydraulic pump to start with.
 
You may be correct on the priority, verses flow divider valve. My little Kubota B2150 has a priority valve and the loader nearly stops when steering it.
Loren
 
Not with an open center system like that IH. The steering unit flows the full steering fluid output of the flow divider at all times, it is either moving the steering unit or just returning through the open control valve to the oil tank.

What you suggest would be true with a closed center system, but not on an open center system like this.
 
Thats why I like to use an adjustible flow divider on an open center system. You can adjust the power steering flow as low as will give you accepetable power steering speed, in some cases as low as 1-1.5 gpm, so you lose very little oil flow capacvity for the rest of the hydraulics.
With a non adjustible, fixed orfice valve flowing 3-6 gpm, you may well be bleeding off much more oil than the power steering system needs to operate,and needlessly slowing the rest of the hydraulic system.
 
Gee, thanks fellas. That's really got everyone talking. I appreciate the wisdom on this site.
The system I am looking at using is only 1.5 to 2GPM. I know the pump is only around 3 times that, but it is easily upgraded to around 10GPM via a replacement pump.
The loader is a VERY basic system, with power up only, the rest is gravity down, or trip unload. Yes, I know they are not liked these days. Yes, I have used and owned "proper loaders" in the past. But these days it's only me on my hobby block and let's face it. The basic system is still better than the shovel and wheelbarrow! I'm getting too old for that. So if it's a bit slow? So be it - so am I! But it can work for longer than I can!
Cheers,
Rex
 
Hi again, especially JDS.
So, originally I was looking at priority valves, but had trouble getting hold of one, and found an adjustable flow regulator valve (VPR3 type) and it sounds as if I was incorrectly advised that it was the same thing and would do the same job.
So what you are saying is that with the VPR, the flow to the steering would be bypassing the main system all the time, and with the priority valve, the steering would use what it needs and allows the main flow to keep going on full power to the main supply unless the steering is used? Have I got that right?
Much appreciated, you may have saved me making an expensive mistake!
Best regards,
Rex
 
It would depend on the steering valve and priority valve. If the steering valve is open when in the neutral position then you are going to lose flow through it even when it is not steering. Then just use an adjustable flow control valve. If the steering valve is closed when in neutral than the priority valve will put the full flow to the loader.

For the second type of system it takes the correct priority valve to work right. I know it can be done on an open center system because some of the cheaper JDs and several of the smaller Kubota steering systems work that way.

You need to talk to someone that is knowledgeable about the valves you are looking at using.
 
Thanks Jds,
I'm looking at using the old tried and true hydraulic ram type steering where the pitman arm connects to the valve on the ram and trips the valve when the wheel is turned. Takes the load right off the steering box (and the driver) but I'm not sure how much oil flow is involved when not steering.
Thanks again,
Rex
 
Rex, make sure you are not confusing a hydraulic throttling valve with an adjustible flow divider, they are very different animals. Theadjustible flow divider is what I used on the IH 450 with it's open center hydraulic system.
 
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