how much flow thru a sae8 fitting

[BukitCase]

JJ, I was figuring all that junk out while you posted - Safeway's data looks a lot more optimistic than mine.

What I don't quite get, is they refer to their "high flow poppet" style, yet their specs show exactly the same flow for either ball or poppet types of a given size.

Kinda makes me think your "put the hose in a bucket" approach makes more sense than ANY of this ... Steve

 

[npalen]

A really great discussion on hydraulic flow, guys! I worked with hydraulics quite a bit in my job as a design engineer for farm tillage equipment and one thing I've noticed is the use of -8 QD's over the years. The tractor manufacturers have used -8 QD's for as long as I can remember going back to the late 60's at least. Back then the tractors were putting out maybe 10 GPM and at much less PSI than now days. Last I new -8 QD's were still being used on tractors with pumps putting out 30 GPM with some as high as 60 GPM and at 3000+PSI. That's a lot of gallons to put thru the tiny QD's but, then again, these tractors will usually have at least four sets of QD's with some being used simultaneously. Also, I have noticed that some of the newer tractors will have at least one set of much larger QD's along with larger supply and return lines. That becomes a necessity when running high volume hydraulic motors such as air seeder blower fans, large grain unloading augers etc.

 

[CJONE]

A really great discussion on hydraulic flow, guys! I worked with hydraulics quite a bit in my job as a design engineer for farm tillage equipment and one thing I've noticed is the use of -8 QD's over the years. The tractor manufacturers have used -8 QD's for as long as I can remember going back to the late 60's at least. Back then the tractors were putting out maybe 10 GPM and at much less PSI than now days. Last I new -8 QD's were still being used on tractors with pumps putting out 30 GPM with some as high as 60 GPM and at 3000+PSI. That's a lot of gallons to put thru the tiny QD's but, then again, these tractors will usually have at least four sets of QD's with some being used simultaneously. Also, I have noticed that some of the newer tractors will have at least one set of much larger QD's along with larger supply and return lines. That becomes a necessity when running high volume hydraulic motors such as air seeder blower fans, large grain unloading augers etc.

Most new tractors have closed systems so it will only put through the coupler what it will take. They also have case drain ports and if you are running a motor you need to use them with such small couplers, the return pressure will be really high. As far as the processor you will be fine with 3/4" lines, I will sometimes cut some out of the fittings for better flow. Use sweeping 90's on the hoses for better flow. Also you will be forcing more than your rated GPM when the cylinder returns because of the rod Dia returning the cylinder faster than the out stroke. What is the valve rated at? You are using a large cooler on your processor right?

 

[muddstopper]

Here is what I found out. I had some 3/4pipex10jic fittings on my splitter. They screwed in just fine in the 3/4-16 sae ports. A little teflon tape and no leaks. I replaced the 4in bore cylinder with the new 5in bore cylinder and tested it out. Certainly a big difference in splitting power, but also a big decrease in speed. I didnt measure the inside dia of the fitting, but it looks bigger than 1/2in. I have a couple of 3/4 pipe fittings on the shelf so if i remember when I go back to the shop later i will take a measurement. I am guessing 5/8 id

 

[BukitCase]

I'm guessing you screwed the JIC end into the SAE, NOT the NPT end? Because NPT is 14 TPI, while the JIC has same thread pitch as SAE.

Don't see why that wouldn't work (obviously it did) - but of course, the two types wouldn't seal without a bit of "help" -

Push stroke on a 5" cylinder takes 1.56 x as much oil per inch of movement as a 4", not surprising you noticed it Steve

(It also will have 1.56 x as much "push", of course)

 

[muddstopper]

I screwed the pipe into the sae and I screwed the same fitting into a galvanized pipe fitting I had on the shelf so I am pretty sure it is pipe thread. The cyl advertised 3/4-16 sae oring ports, and the ports look to have the recess for the oring, so i dont know what is going on, but it worked. Didnt act like a thread mismatch, screwed in by hand about halfway down, just like a pipe fitting and finished tightening with a adjustable.

I knew doing the cyl swap would slow the splitter down a bunch, but the 5in was a exact fit in place of the 4in and I really needed the 4in to go back on my dump trailer where I robbed it from. This splitter has a 25hp kholer eng and i will probably go ahead and mount the 28gpm pump on it when I get one. I want to experiment with a multiple wedge design and would rather do it on this splitter than wait until i get the processor built and then have to start cutting off parts and rewelding when things dont go as planned. It will be a while before i actually start putting the processor together as I am still rounding up parts. I have the powerplant, saw parts, hbeam and trailer to mount it all on, and a bunch of odds and ends cylinders, but still looking for control valves and pumps. As Johnny Cash once said, "One piece at a time, and it didnt cost me a dime", altho not so sure on the dime part.

 

[J_J]

You could get away with a 14 HP engine using the 28 GPM pump.

You could use that extra 11 HP to run other pumps.

This valve is an auto-cycle log splitter valve.

Another nice valve to have wuld be a two spool valve for the log lift and a movable wedge.

Surplus Center - 1 SPOOL PRINCE AUTO CYCLE LOG SPLITTER VALVE W/PB

 

[muddstopper]

JJ, I thought I had some pics of my splitter in my uploads, but didnt find any. My current splitter does have a adjustable 4way wedge. The splitter valve is a regular splitter valve with detent. The valve i am using for the wedge adjustment came off a small ditchwitch trencher. At one time I had a hydraulic knuckle boom mounted that used the same control valve. I overloaded the knuckel boom and broke it off at the base, but have since mounted a small truck crane with electric winch for loading the large rounds. The hbeam is a w6x6 that I reinforced the web with 3/4 in plate on each side and 1/2in plate on the top flange. The pusher plate is 1in steel 18in tall and 10in wide. The 4way blade is 3/4 in 12x 24 tall with a 18 in tall backbone for support. The wedge is adjustable from a single split to a 4way split at 24in tall, giving me 4-12in dia pieces. Since putting the new 5in cylinder on and just fooling around giving it the ignorance test, I have sliced thru a 10in dia piece of seasoned yellow locust sideways with only a slight bow to the hbeam. My processor will have a 8in hbeam with similar re-inforcement, but I also plan on a cookie cutter wedge design to reduce those 12dia splits into 6in dia splits so it will be a 8 way splitting wedge, possibly 12way. I will test out wedge designs on my current splitter until I get what I want, or break something, or figure out what the maximum splitting power is of this setup. My splitter is probably a better machine with the 4in cylinder on it. Speed was just right and had plenty of power for the 4way wedge, but it will make a great test machine for things I want to try on the processor. Oh, and while doing my testing, I will probably manage to get my firewood split for the winter.