flow control

rasorbackq · Feb 28, 2015

So I bought a wood chipper today. Its a Tytan kc125
Been modified to a hydraulic feed My question is the way he had it plumbed to his tractor was....... He didn't have remotes on the back so he used the curl function from the FEL The flow control has 3 hoses one to in feed one to reverse and 3rd hose for tank return. The pic shows the IN EX 9tank return and the CP output. I want to get rid of the 3rd hose. Let me go back a little . The 3rd hose was just placed in the rear of the tractor where the fluid is added for oil changes. If I cap the outlet (EX) will the flow find its way back to the tank?

J_J · Feb 28, 2015

You have the IN port, the CF= controlled flow port , EF= excess flow port.

I don't believe the excess flow can be blocked as that is the port that sends the excess fluid to tank.

It can be blocked in a restrictive situation , where the pump is pressure compensated pump or a closed center hyd system.

The flow control valve itself does not reverse, the curl circuit reverses..

rasorbackq · Feb 28, 2015

What he was doing was applying pressure to the In or the CP to get the flow to reverse to run the feed roller.He told me to block the EX.
The last question I had last week that you JJ answered about this thing

It is just a valve . I hooked up an other chipper with Hydraulics to it and both forward and reverse worked with the lever held up or down.
So back to this flow control. Thought it would work with the unit plugged.

rasorbackq · Feb 28, 2015

J_J said:
The flow control valve itself does not reverse, the curl circuit reverses..

Correct .
since the curl function is pressured both ways there was no return to the tank so the added CF was used.

muddstopper · Mar 1, 2015

blocking the ef port is not a good ideal. I assume your control valve for your curl function does have a built in relief. The excess flow has to have a way back to tank. Blocking the ef port will cause the fluid to run over the relief on your curl function valve, cause excess heat, and probably damage the valve over time. I can only guess the flow control was added to the system to control the speed of the chipper feeder. Not sure how well the setup worked. Unless the there is a seperate control valve mounted on the chipper to control the direction of the feeders, I suspect it controlled the flow and speed in one direction only. . If there is a separate control valve on the chipper, and the flow control is mounted before the valve on the pressure side, you can Tee your flow control EF port into the return to tank port of the chipper control valve to get the excess flow back to tank.

rasorbackq · Mar 1, 2015

Muddstopper..... I want to hook up the 2 lines to the valve 3 posts back and plug the Cf side . So for forward rotation of the chipper feeder will be down with the valve 3 posts back and to reverse the chipper feed .... lift the handle up
Not sure how the flow control works but hope it can only allow what it is set for to flow through and the rest will have to waits its turn. ISince fluid will ahve to wait its turn I see the need for a relief on my valve.

J_J · Mar 1, 2015

The excess flow can only feed another hyd circuit or go to tank.

If you block it, and the master relief can not handle the flow, then your pump is at risk.

aczlan · Mar 1, 2015

rasorbackq said:
Muddstopper..... I want to hook up the 2 lines to the valve 3 posts back and plug the Cf side . So for forward rotation of the chipper feeder will be down with the valve 3 posts back and to reverse the chipper feed .... lift the handle up
Not sure how the flow control works but hope it can only allow what it is set for to flow through and the rest will have to waits its turn. ISince fluid will ahve to wait its turn I see the need for a relief on my valve.

Why not put the fwd/reverse valve after the flow control valve? That way you meter how much fluid gets to the fed/reverse valve and dont cause problems when you reverse it?

Aaron Z

muddstopper · Mar 1, 2015

Aaron, the way you are suggesting is the only way he would be able to get his flow control to work in both directions. A flow control will only work in one direction and if it is placed after the valve, it would allow full flow in one direction and a controlled flow in the opposite direction. If he places the flow control before the control valve to control flow into the valve, it would effectively control flow going to the valve, then the motor in either direction. He would still have to tee the EF to the tank side of his control valve, ( or back into the fill port like it currently is) in order to get rid of excess oil. As for just plugging the EF port and the rest of the oil waiting its turn, aint going to work, at least not well, and most likely causing damage to other parts of the hydraulic system.

J_J · Mar 1, 2015

When the lever on that valve is at 1 or left, all the flow is going to EF, to tank or another circuit.

As you push the lever to 5 or 8 to the right, you send IN flow to the CF port and if you are full lever, EF gets nothing.

Why not get a motor valve, either solenoid or lever type.