Will this work without PB?

[BukitCase]

Starting project to add 4 more remotes to an old AC 160, planning to cut 12mm tubing just before the red-circled area in upper left corner of the attached drawing and insert this valve https://www.surpluscenter.com/item.asp?item=9SV-4-X&catname=hydraulic - am I correct in assuming that, since the tractor will be lucky to make 2000 psi and the valve is rated for 3000, that it will be OK inline with the input to the 3PH valve (the block to the left of the red circle) ??!?

The SCV in the link can supposedly be converted to PB, but I'm not sure what (if any) in my case this would do. Seems to me that, with the 4-spool valve, open centered, inserted BEFORE the 3PH valve, that any of the 4 spools would divert pressure to its cylinder and allow the other port of that cylinder to exhaust thru the OUT port of the SCV and on thru the 3PH valve and to tank.

Anyone disagree, and why? The valve, t-n-t cylinders and assorted fittings are either here or will be by tomorrow, hoping I don't need to send anything back

Thanks for any insight... Steve

 

[J_J]

The reason you want to use PB is that that PB port is designed to handle high pressure.

Sure you could just do as you say, but you run the risk of failure when high pressure destroys your valve.

If you look at the specs on most valves, it will say return or OUT port , no more that 300 to 500 psi.

If your valve is in line and connected as you stated, and you cause the 3pt relief valve to activate to max, then you have put the 3pt relief pressure on the return port and all valves up stream. It is advisable not to do that.

On most hyd valves the return/OUT ports go to tank, as low pressure.

Items 12 and 13 are high pressure hose.

The area you have circled, is the port on hyd block LV a high pressure port?

You should order option Y which is PB end section. It is only $5 more.

 

[BukitCase]

Wow, 11 minutes til the guy I'd HOPED would respond - JJ, thanks a LOT. Your comments finally clicked, I looked at the specs again and finally realized what "Maximum Tank Pressure................... 500 psi" really meant. (duh)

Sooo, cut the line, pressure IN to the new valve, PB out back to the 3PH valve, and a SEPARATE out from the new valve's outlet back to tank (there's a 1" clear hose in that line where I could add a tee.

Closer, or am I still off? Steve

 

[J_J]

A clear line that can handle hot fluid, be careful there.

You can tee return hoses together.

I modified my above post read again.

 

[BukitCase]

Re-read your post, opened the box for the outlet section, found NO PB adapter (the instructions made it sound like it was included) - called surplus center, woulda been $15 cheaper if I'd understood as much as I do now (dang) but it's on the way.

BTW, the clear return section is short and has some sort of reinforcing wires embedded, looks stock and doesn't leak. Still, since I'll need to cut back the hard tubing a ways I'll use better hose when I tee into the return.

Even closer to nirvana, thanks again... Steve

 

[Guesseral]

Well JJ I think you just solved a question for me that has been nagging me and just make no sense what so ever but I was just to embarrassed to ask!
My loader valve has a pressure hose, a tank hose, and a power beyond hose connected between it and the hydraulic distribution block. I just for the life of me couldn't figure out why that power beyond hose was connected to it! Now I guess I know.

 

[BukitCase]

Guesseral, that makes two of us - I always say that any day I learn something without loss of body parts, it's been a good day -

JJ, sorry I missed one of your Q's "is the port on hyd block LV a high pressure port?"

Yes, it is - it's the inlet to the valve (LV = Lift Valve) for the 3PH. It's the last pressure point in the system, and the ONLY place that's practical at all to tie into.

That 12mm tubing coming into the lift valve will be cut, 12mm flareless-to-#8 JIC male adapters inserted, then tubing/hoses run to inlet and PB of the new valves, and outlet of new valves back to tank.

It'll be awhile before I get back to this, but I'll try to get lotsa pix as I go. I've found out enough useful info on fittings, etc, to possibly be as helpful to others going down this road as you and others have been for me. If I can't pay it back, I'll have to pay it forward. Thanks again... Steve

 

[Guesseral]

Yea in the last week or so I have learned a whole heck of a lot about hydraulics, here on TBN and from the MFG of my loader. If people are not aware many of the loaders that are on our tractors are produced by AMEREQUIP right here in the USA! Here is there web site.

Design, Engineering and Manufacturing Solutions for OEMs, and Custom Equipment, Tractor Attachments and Backhoes - Amerequip (ARPS)


These people are really helpful at least they have been for me. If you look at there web site and all of the OEM's that they manufacture equipment for you may be suprised. I had found out that they manufactured the loader and the backhoe (if I had one) for my Montana a while back, and I have emailed them twice and I have recieved helpful information each time. It's just nice to see a company based in the USA building products that are sold world wide by the OEM's they supply, it's also nice to have SAE size hoses and fittings on a piece of equipment!:thumbsup:

 

[BukitCase]

Just a minor (but hopefully confusion reducing) update - If you decide to use the valve in my first link, the Prince documentation specifies two different output sections depending on whether you jump the gun (as I did), initially decide you don't need PB and later change your mind, or order the PB version the first time.

My hurry cost me about $15, since the PB outlet section is only $5 more. I paid $18, but no extra shipping since I ordered the T-N-T stuff at the same time. The PB adaptor alone is here https://www.surpluscenter.com/item.asp?catname=hydraulic&qty=1&item=660280001

Surplus Hydraulics pn# for open center, no PB is 9SV-4-X - Change the X to a Y and it's a power beyond version. They also state that the PB port is a #10 SAE/ORB. This is only PARTIALLY true -

In fact, both output sections are the SAME CASTING. The casting has a #8 outlet on top and another on the side, and a #10 outlet for PB - however, if you look at the pic of the PB version, you see two PLUGS on the side.

The center one is a #10 for PB, but the PB adapter apparently ships WITH but not ATTACHED to, the valve because there is only one PB adapter listed for these valves in Prince's documentation, and it has #10 threads on the MALE that goes into the valve output section; the actual PB output port is a #8 SAE.

This turned out to be a GOOD thing for me, since I'd already ordered all #8 fittings and Discount Hydraulic has a minimum order quantity of either $20 or $25, don't recall.

If I'm not careful, I might actually know something about this stuff before I'm done - hopefully it'll also make things easier for others... Steve

 

[wdchyd]

If I'm not careful, I might actually know something about this stuff before I'm done - hopefully it'll also make things easier for others... Steve

A few days after ya stop learning you'll probably be 6' under......It's one thing to do something, but another to learn and do something.....:cool2: