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Are hydraulic valve spools hardened?

BarnyardEngineering

BarnyardEngineering

Well-known Member
Location
Rochester, NY
I'm talking the actual spools, the part that slides back and forth in the valve body and direct the hydraulic flow.

I've got an old 3-spool valve that I put a lot of time and effort into making new handles and tightening up slop, only to find out that two of the spools are single-acting...

Yes, pretty stupid of me to not check before wasting all that time.

The single acting spools look like they have enough meat on them that they could be turned into double acting by a competent machinist, but only if they'll turn on a lathe.

My luck, they're hard as coffin nails, and/or chrome plated.
 
The ones I've messed with have been at
least case hardened to the degree a file
won't cut the sliding surfaces.
 
Run a file across a non-critical spot to see how hard they are.

The valve spools we made for 1970's GM car automatic transmissions were all hardened before they went to the centerless grinders. I can't remember the hardness number or the depth. Carbide might work to cut in some reliefs, a grinder would definitely work, but a new valve might be cheaper, especially if the old one can be used elsewhere or sold.
 
It would depend on what type modification you are needing.

Even if they are hard, they could be turned with carbide.

As long as you are not actually turning the sealing surface, and can hold it in a collet so not to scratch the surface, it might be possible.
 
Should be case hardened and chromed.
Possible to change them if the body is
ported right. Make those carbide cutters
earn their money, after the grinder rock
cuts the chrome out of the way.
 
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