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Hydraulic valve terminology

Z

Zachary Hoyt

Well-known Member
I am looking for a new 2 spool valve block for the loader on my Massey 35. I have found what looks like it would be a good fit on Surplus Center, but I do not understand some of the terms. It says that the work ports are SAE 6 and SAE 8. Is that another term for pipe thread, or is it a different thread that I would have to adapt. My current spool valve is as old as the loader, which is older than dirt, and it leaks like there's no tomorrow. I will try to attach a link to the item at Surplus Center. Thanks very much for any advice.
Zach
Maybe this will work
 
I am pretty sure your sae 6 is standard 3/8 pipe and the sae 8 is standard 1/2 in pipe.
I am sure if I am wrong someone will correct me.
 
SAE is totally different threads than pipe thread. If your hoses are pipe thread now then look for a spool valve that is made for pipe thread, rather than use adapters. Surplus Center should have them. I have purchased single spool valves there, but havent looked lately. Ones that use pipe thread are real common, I have 2 used double spool valves on the shelf, never know when Ill need one.
 
SAE threads are TOTALLY different frm pipe threads.

SAE threads have the same size and # of threads per inch as fine thread bolts. They seal with an O ring. SAE 6 is 3/8 inch and SAE 8 is 1/2 inch. Much less likely to leak than pipe threads.

Pipe threads are tapered and seal by metal to metal contact when tightened down (if you are lucky).

The two types cannot be interconnected without adapters, which fortunately are readily available. Surplus Center has many of them.
 
Zach, I just googled "SAE 8" and came up with several sites that explain the differences in threads. Hope this helps. Mike
 
The NUMBER in the SAE size, is the size of the tube the fitting fits in 1/16 of an inch. SAE #6 is 6 X 1/16 = 3/8 inch. SAE #8 is 8 X 1/16 = 1/2 inch. There are O-Ring and flare fitting in the SAE/JIC standard. The angle of the flare is 37 degrees which is different than the 45 degree used on copper and I think the double flare like what is used on steel brake lines. The threads on these fittings are a fine thread. SAE #6 is 9/16" X 18 thread I think. I can not find my hydraulics catalog to check. These fitting are know by some around the racing community a AN fitting because all of the old WWII surplus hydraulic fitting, which are the SAE/JIC standard, were marked AN for Army/Navy.
JIC goes as big as at least SAE #24.

Kent
 
Zach how old are your hydraulic hoses??? The reason being that newer pipe fitting have a tapered flare on the inside at the start of the fitting. You then could use the valve you have pictures with adapter fitting that is kind of a pipe/jic fitting. I know I am not describing it very well but it is a very common fitting. It allow you to install pipe tread hoses without swivels. The adapter would be SAE straight thread with an oring toward the valve and the other end would be a female nut that holds the pipe fitting tight so it would seal on the inside taper rather than the traditional thread taper.
I found the ones you would need on Baileynet.com
http://www.baileynet.com/index.php?id=31&productcategory=1000021 they cost about $2.30 each.
I am attaching two pictures. One is the adaptor and the other is the new style pipe end for hoses.
a25967.jpg

a25968.jpg
 
NPT or pipe threads are tapered and the SAE threads are straight threads, like fastners that seal with an o-ring. The tapered pipe fittings seal due to an interference fit, as long as thread sealant is used.
SAE threads are sized by dash #s. Such as, #6 Sae is 9/16"-18 thread and the dash #8 thread is a 3/4"-16 thread, the dash #4 size is a 7/16"-20 thread. A fluid power data book is your friend.
 
Those SAE fittings with o-rings are also commonly referred to as ORB (O Ring Boss) fittings.
 
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