LOG SPLITER BUILD

[LD1]

Still not sure I follow you, but whatever the green line between valves is, shouldn't be needed.

Each valve has its own low pressure return.

Main valve feeds your flow control out of the PB port and then supplies second valve. So supply and return are handled for the second valve.

Erase that green line and I think you are all good.

And what kind of flow control are you getting? An inline won't work too well off a PB trying to move 28gpm. If the flow control is more like a flow divider that can dump excess to tank, might be okay.

If it was mine, I'd run a pair of inline flow controls on the lines AFTER the auxillary valve. And would upsize it to 25gpm to handle slow when in neutral

 

[perkins78]

I looked it over again and got rid of the green line between the two valves here's a new sketch

 

[perkins78]

Still not sure I follow you, but whatever the green line between valves is, shouldn't be needed.

Each valve has its own low pressure return.

Main valve feeds your flow control out of the PB port and then supplies second valve. So supply and return are handled for the second valve.

Erase that green line and I think you are all good.

And what kind of flow control are you getting? An inline won't work too well off a PB trying to move 28gpm. If the flow control is more like a flow divider that can dump excess to tank, might be okay.

If it was mine, I'd run a pair of inline flow controls on the lines AFTER the auxillary valve. And would upsize it to 25gpm to handle slow when in neutral

Prince Adjustable Flow Control Valve — 3/4in. Port Size, Model# RD-175-30 | Adjustable Flow Valves| Northern Tool + Equipment
The link above is what I'm thinking for a flow control valve It says it 30 gmp it was my thinking that I would be able to use lower flow valves for my lift and maybe a four way wedge and be able to reg the speed of them. Its was also in my mind that the flow control valve rated for 30 gpm would be less restrictive than say two 25 gpm valves

 

[LD1]

A flow valve is as restrictive as you make it.

You want a lift and adjustable wedge to be slow. Like say 2 gpm.

If you restrict the PB line feeding the aux. Valve as you show, it will probably make the pump kick into low gear and work hard. Because it's trying like heck to put 28gpm (or 7 gpm in low) through a flow control. If the flow control is dialed below that to control speed, the only place the excess goes is through the relief. And that's what builds heat and cooks hydraulics if done for extended periods.

And doing that, is exactly what will happen anytime the main valve is in neutral. Because when the main is in neutral, oils only exits via the PB. And when pressure is exceeded, then it exits through tank.

It's not good practice to design a system to pump oil through the relief. The only time that should happen by design, is when you stall out a cylinder, and then it's only momentary

 

[LD1]

Edit: I just looked at the flow control you picked. That should work for what you want. That's not an inline flow control in the sense that I think if one.

When I think flow control, I think inline needle valve kind, which is basically just like a ball valve In The sense that it only let's a given amount through and the rest is held back.

What you linked is more like a flow divider that lets a little go to the aux valve and the rest return to tank.

 

[perkins78]

Edit: I just looked at the flow control you picked. That should work for what you want. That's not an inline flow control in the sense that I think if one.

When I think flow control, I think inline needle valve kind, which is basically just like a ball valve In The sense that it only let's a given amount through and the rest is held back.

What you linked is more like a flow divider that lets a little go to the aux valve and the rest return to tank.

You got me thinking though I don't think it will work as I planned because the the inlet on the flow control will build pressure cause the pump to be in low flow all the time

 

[perkins78]

THis maybe a better option

 

[LD1]

Yea, better.

 

[Wild Bill the 2nd]

I had never seen that valve, its a pretty good idea.

My only concern would that you'd have a log launcher rather than a lift at 28GPM.
If the valve does not somehow regulate the flow to the other circuits I guess restrictor orifice fittings or small flow control valves would be the best option.
Either that or be very careful when feathering the lever.

 

[LD1]

Small inline flow valves after on the log lift and wedge would be perfect. Anytime things are in neutral that is no blockage or restriction.

Only time you will restrict flow is when operating one of the auxiliary functions, then it is more momentary. But I would try it first without. And no need for more than 1/4" lines. Try to get good at feathering the lift spool.