Hydraulic Pump Noise... but not always.

[950deerehunter]

I have been following this conversation and have learned a lot(with a lot more to learn) and have one observation which may or may not apply. In the document oldnslo attached in post 30 about Prince Valves the first cover page lists "STANDARD FEATURES: 1-10 Sections Per Valve Bank". Would it be OK(advisable) to couple all 15 working spool valves together? Good Luck

 

[RDSmith]

950deerehunter has an interesting idea but even if it would work it would be an enormous task because of how the valves attach to the saw.

Do I have it straight now. I have to use the down port because both valves can't be made strictly open circuit? The part 660280001 will replace the "CC" plug on "SVE22 Power Beyond Outlet w/ #8 SAE Beyond Port #10 SAE ORB (7/8-14 TH" This part (660280001) will have a fitting (#10 ORB) I can attach a hose to and connect this hose to the other valve's input? This part will block the outlet to the fluid reservoir? The outlet of the second valve (SVE21 end plate will go to the reservoir?

The second 9 spool valve has some unused spools. I can attach one of these to the carriage travel motor? If I can get the correct size fitting?

What I'll need for relief valves will have to come later. I think it was k5lwq who explained about relief valves and I thank him but I'm still not sure what's needed when the valves already have relief included/

Thanks once more for being so patient eveyone.

 

[K5lwq]

RD, the relief that is in your stack valves is all you need.

I was able to watch a video that is interesting of a guy using a Woodland Vertical sawmill. Not sure if this is close to what you have, but from watching, I did not see where he needed more than one function at a time. So I think your plan should work just fine.

 

[oldnslo]

RD,
I believe the power beyond plug will have a #8 SAE port Vs the #10 but other than that I believe you have the circuit correct.

 

[oldnslo]

I have been following this conversation and have learned a lot(with a lot more to learn) and have one observation which may or may not apply. In the document oldnslo attached in post 30 about Prince Valves the first cover page lists "STANDARD FEATURES: 1-10 Sections Per Valve Bank". Would it be OK(advisable) to couple all 15 working spool valves together? Good Luck

950,
are you asking if you could stack all 15 valve sections together in one assembly or if it is wise or permitted to have the two valve sections tied in series so the oil if forced to travel through all 15 valve sections?

I suspect the limit of ten sections is based on the tie rod strength since the tie rods are also supporting the weight of the valve sections and if these tie rods flex or bend it would allow the O-rings between the sections to extrude and leak. There may be other reasons also.

These valves are designed with the option of having power beyond so that you can plumb them in series. It is up to the system designer to determine what pressure loss is acceptable when doing this.

 

[RDSmith]

And besides that it looks as if you can only buy rods for 10 spools.

Yes K5lwq, the mill I have is similar but has more features including an edger maybe? I'm wondering about the yellow cord/line/hose/tube going to the carriage. Or maybe it's blade lub or air?Could that have something to do with a pump that wasn't a gear pump? I need to watch some more. Thank you.

oldnslo, and others I guess, I have another question now. I tried to make a maybe crude drawing again. The pump has lines going to all three valves, If just one of these would be open center wouldn't fluid travel through that one and there wouldn't be the noise and vibration when nothing is being activated? Maybe need to replace but "CC" plugs? The pump is only at about 360 rpm (12.64 gpm at 2000 rpm. And could I plug the outlet of the first valve... the one with outlet SVE22. when option 2 replaces the "CC"

 

[oldnslo]

RD,
for a fixed displacement pump, open center system ALL of the valves must be is series you cannot tee into the pressure line. Reason for this is that if one valve is dumping flow to tank none of the other valves will work until you block or restrict that flow path to tank.

 

[RDSmith]

I understand that but just trying to point out that all the valves, as is, are closed or as you say oil would be flowing back to the tank all the time when nothing is activated. I'm just showing how it is now. So, wouldn't both "CC" plugs need to be replaced by something? Or a different outlet section?

 

[oldnslo]

Yes both valves need to converted to open center operation

 

[950deerehunter]

950,
are you asking if you could stack all 15 valve sections together in one assembly or if it is wise or permitted to have the two valve sections tied in series so the oil if forced to travel through all 15 valve sections?

I suspect the limit of ten sections is based on the tie rod strength since the tie rods are also supporting the weight of the valve sections and if these tie rods flex or bend it would allow the O-rings between the sections to extrude and leak. There may be other reasons also.

These valves are designed with the option of having power beyond so that you can plumb them in series. It is up to the system designer to determine what pressure loss is acceptable when doing this.

I wasn't asking if all the spool valves could be physically stacked together but instead coupled with a hose. Was wondering, as you said, if there would be to much pressure loss through all the spools in a series?