Auto Cycle valve

[6sunset6]

ok I got the 2300 max on the main relief, 2000 on detent 2 and 1800 on detent 1. I am leaving 700psi on the table but that's the way it is. If I need more pressure i.e. 3000 on the cylinder I will call Prince.
I have a gage in the main pressure supply line. How does one go about setting all the pressures including the pump? With out damaging anything.

Also I have a set of valves downstream on the power beyond port from this set
I assume it's relief can be set lower than the relief on the first valve, maybe 2000 ?

 

[J_J]

Why don't you want to set your valve relief to 50 psi below the pump pressure.

As I said before, you lose a lot of force by not setting the valve relief, 50 psi below the pump pressure.

If your log splitter relief is set to 2300 psi, you limit any valve downstream to 2300 psi. If this is a 3pt log splitter, the limit you set on the log splitter valve will limit the pressure downstream , and if the flow from your log splitter goes back to the 3pt, that will limit the force on the 3pt.

Is this valve on a 3pt log splitter or a standalone?

Difference in force if you use 2300 psi instead of 3000 psi.

4 in cyl 2 in rod

2300 psi = 28,903 lbs
3000 psi = 37,699 lbs

 

[6sunset6]

Why don't you want to set your valve relief to 50 psi below the pump pressure.

As I said before, you lose a lot of force by not setting the valve relief, 50 psi below the pump pressure.

If your log splitter relief is set to 2300 psi, you limit any valve downstream to 2300 psi. If this is a 3pt log splitter, the limit you set on the log splitter valve will limit the pressure downstream , and if the flow from your log splitter goes back to the 3pt, that will limit the force on the 3pt.


On a 4 in cyl and 2 in shaft, 1000 psi is a difference of 12,586 lbs, or about 6 ton.

Is this valve on a 3pt log splitter or a standalone?

JJ The whole story is here.
http://www.tractorbynet.com/forums/build-yourself/226024-woodsplitter-build-2-a.html

 

[J_J]

I saw all that but did not connect the two threads.

My point here is if the pump can develop 3000 psi, and if you want max power out of the log splitter, you would set the Autovalve to 50 psi below 3000 psi.

That is so you can call you splitter a 18.53 ton, verses a 14.45 ton splitter , using a 4 in cyl, and 2 in rod.

 

[glastron23]

6sun. the first thing about these auto cycler valves to remember is that once you pull the handles it will stroke full out and then full retract. the pressure settings on the detents is what causes the piston to reverse the stroke out/in. the higher the pressures on the detents the more resistance it will take to achieve this. the more strain you put on the engine/pump/hoses/cylinder and the more heat you will develop.
That you need to do is set the detents to the type of wood you mainly split, soft wood needs very little pressure to split,500 to 750 psi. maple is the same. birch, beech, oak, needs more but twisted yellow birch will really try the machine.
I would leave the main pump pressure at 3000psi, then play with the detents for the wood you mainly use. If a few pieces require more then just grab the handle and do it manually. This will prevent the system from working at max psi all the time when it's not required. Jim

 

[6sunset6]

I see. Full pump pressure never develops then until the valve handle is held manually. The system will reverse mid stroke if it hits something hard. Then hold it manually. As long as it does not do it all the time it's ok. But if it does that crank up the detent setting.
I have to go take some pictures.

 

[6sunset6]

Question I ordered the Prince valve
Surplus Center - 1/2" NPT 20 GPM 1500-3000 PSI RELIEF VALVE RV-H4
It says it is an inline valve which is nice and would save some fittings. But the space I have to work in will not allow it to be plumbed in line. Bummer. But I see no reason that I cannot hang it on a tee, one pressure port piped to the tee and the other a gage port. Tank port goes into the return line. Another question I assume "tank" means a return line and does not have to be direct to the tank. I would prefer to have all returning oil go through the filter, which is in the return line.

 

[J_J]

Yes, tank line is the return fluid from all the cyl, motors, anything that uses the fluid to produce force. Since the return flow is low pressure, you can combine all of the return flows into one hose going to the filter and then the reservoir/tank, as long as the back pressure stays low.

You can have one hose going to the filter if the flow rate is matched with the filter capability. The filter should have an indicator, either a gage, or a electronic warning device like a light or horn to warn of filter changes.