Diverter valve

[Degolyerent]

I am in the process of adding a grapple to my Kubota MX4700 and I understand that a Diverter valve is the easiest and most economical way to go. My question is which valve exactly that I need, I was hoping that J.J. could point me in the right direction. I have looked up some specs on my model tractor and they are, pump 9.5 gal. Per minute with a total flow of 14.4 gal. Per minute. It is a open center system.
I have been wanting to add a grapple for a long time and the time has finally come, I would truly appreciate some advice and guidance on this set up.
Thanks
John

 

[kennyd]

This one will work perfectly: Surplus Center - 12 VDC 13.2 GPM SAE 8 DOUBLE SELECTOR VALVE

 

[J_J]

The solenoid valve posted above will work fine, but only has a 2500 psi rating.

This solenoid valve is less expensive and has about the same specs. Max psi 5000

Stackable Solenoid Operated Circuit Selector Valve | Type SAE 8 SELECTOR VALVE SOL OPT SAE 8 220-934

$110 plus shipping.

Add a momentary switch and wire it to the accessory panel .

http://www.cyber-tech.net/index.cfm?fuseaction=products.display

 

[MtnViewRanch]

Either valve will work fine for you, the $160 unit is a little more refined is all. That with one of these control grips and about $150-$200 in fittings and hoses and you will be all set.

Let me know if you want some help, I can get you any or all parts required.

 

[Degolyerent]

Gentleman
The valves shown to me are the ones that work off of the curl circuit ? So just alter hose to go to Diverter valve and then out back to curl circuit correct? And then just a single trigger will operate the open and closing of the grapple? I see from the instructions on the valve description the way it ties to cylinders, I just want to make sure I have the correct idea of how it works.
Thanks
John

 

[kennyd]

Yes John, that description is correct.

 

[J_J]

Gentleman
The valves shown to me are the ones that work off of the curl circuit ? So just alter hose to go to Diverter valve and then out back to curl circuit correct? And then just a single trigger will operate the open and closing of the grapple? I see from the instructions on the valve description the way it ties to cylinders, I just want to make sure I have the correct idea of how it works.
Thanks
John

You would be wise to connect the hoses up so that the curl cyl has fluid with no voltage applied.

You then press the button to activate the grapple and move the joystick for grapple open/close.

If your valve has regen, the grapple will operate faster while in regen

 

[Degolyerent]

J_J
I thought I was understanding the application pretty good until your last statement, what exactly are you saying? I read on instructions where one side is active with solenoid not activated, there is p1-p2 for hook up, come from tractor joy stick curl up side into valve p1and out p2 back into line to bucket curl cylinder?
John

 

[J_J]

I am almost positive that the denergized state, will allow fluid to only exit one set of outlets.

Most solenoids work by pushing or pulling a plunger to open an orifice.

So when you activate the solenoid, the plunger moves to open aother orifice.

If you hook the valve up correctly, the default mode is one set of ports will have flow.

Curl circuit should be your default mode.

Activate the solenoid and you now have grapple as long as the voltage is applied.

If you have the selector valve from Surplus, the instructions say that the de-energized state is circuit one.

Solenoid energized, circuit two is activated. This would be the grapple.

 

[Degolyerent]

Gentleman
I want to thank you very much for the information you have given me, I will order my stuff and get busy.
John

 

[jim_wilson]

On the subject of "diverter" valves: In most cases I've seen these valves being used in an install where they are swapping from one pair of input ports - to two pairs of output ports - and the diverters themselves are being used to control a grapple or something similar - so they are mounted after the FEL controls. In an install like this - there is pressure in the lines but ( I would assume) - there is typically no flow thru the lines at the time the ports are switched.

What happens if you use one of these valves in a line that has constant flow (and pressure)? Will one of these diverter valves handle that kind of setup? Should there be any sort of pressure relief to avoid pressure spikes in the system? If the diverter is mounted after the FEL valve (which has a system pressure relief) - would that be sufficient?

I've never seen any of this mentioned in any of the literature I've read on these valves.

 

[MtnViewRanch]

On the subject of "diverter" valves: In most cases I've seen these valves being used in an install where they are swapping from one pair of input ports - to two pairs of output ports - and the diverters themselves are being used to control a grapple or something similar - so they are mounted after the FEL controls. In an install like this - there is pressure in the lines but ( I would assume) - there is typically no flow thru the lines at the time the ports are switched.

What happens if you use one of these valves in a line that has constant flow (and pressure)? Will one of these diverter valves handle that kind of setup? Should there be any sort of pressure relief to avoid pressure spikes in the system? If the diverter is mounted after the FEL valve (which has a system pressure relief) - would that be sufficient?

I've never seen any of this mentioned in any of the literature I've read on these valves.

Probably because these valves were not intended to be used in that manner. Not to say that they can't be, but there are other 2 solenoid type valves that are meant to be used in that fashion.

 

[J_J]

You only have pressure when a hyd part is doing work.

Those valves can take the full pressure of the hyd system, momentary, or constant pressure.

In the no voltage position, the fluid is just passing through when you use the FEL lever.

You should not switch these valves under pressure.

How would you use this valve other than a diverter.

If you are just trying to switch circuits, you are doing that.

One set of ports is the default and will have flow through it with no voltage..

 

[MtnViewRanch]

Maybe he wants to run a motor in one direction only? Trying to reinvent the wheel?

 

[jim_wilson]

Probably because these valves were not intended to be used in that manner. Not to say that they can't be, but there are other 2 solenoid type valves that are meant to be used in that fashion.

That's what I thought - I've been searching and can't seem to find any for that application (switching under flow and pressure) - any pointers?

 

[MtnViewRanch]

Take a look here.

Solenoid Valves

What is it that you want to do?

 

[J_J]

That's what I thought - I've been searching and can't seem to find any for that application (switching under flow and pressure) - any pointers?

Using this valve, you should be able to switch under pressure.

Surplus Center - 12 VDC 10 GPM OC MOTOR SPOOL SOLENOID VALVE

You may have to allow for the centrifugal force to slow the fluid before switching. IE, a hyd driven bush hog.

Please tell us the end project as we are just guessing how you might use a product at this stage.

 

[jim_wilson]

What I want to be able to do - is switch or redirect the flow coming from the PB port on the FEL valve (which normally feeds the 3pt or backhoe on my tractor - depending on how it's configured) - and send it to another set of valves. Without shutting the tractor off.

All of the "diverter" valves I've looked at appear to be made to switch ports that may have residual pressure - (like from the bucket curl ports on a FEL that you're swapping to control a grapple) - but they don't appear to be able to handle active flow or pressure like you'd get from a power beyond port.

One of my worries is that the interval when the valve is switching the flow there's going to be a pressure spike - I'm wondering whether the appropriate valve to do this would have a pressure relief built in - or whether it would just rely on the pressure relief on the FEL valve block to take care of any spikes.

I wasn't intending on using the switching valve or whatever it would be called to change motor direction - although I might be running a motor after this valve ( I would use the appropriate spool valve to do control the motor).

 

[jim_wilson]

Take a look here.

Solenoid Valves

What is it that you want to do?

Thanks.

Looking at those right now - but one thing stands out that likely makes them not the correct valve for what I want to do - since my preferred mounting location on the tractor is going to underneath the seat - where it will be exposed to weather:

NOT waterproof.

 

[kennyd]

Jim, switching the PB lines just does not make sense, plumb all the valves in series and never look back. Why add a $150 diverter when all you need is a hose feeding the next valve?