Re: gresen hydraulic valve parts

Posted by greygoat on October 27, 2009 at 06:52:31 from (98.125.73.9):

In Reply to: gresen hydraulic valve parts posted by phil lowe on October 26, 2009 at 07:39:33:

On the production line, hydraulic valves are
"lapped in" Machine made bodys are darn close to
perfect, but not absolute perfect. Spools are
measured and placed in pidgin holes, on the bench
of a "fitter". They are grouped in catagories
such as 1/4 thousand undersize, 1/2 thousand
undersize, 1/4 thousand oversize, 1/2 thousandth
oversize, etc.
The fitter grabs a valve body and tries some
spools till he finds one that is a very tight fit.
Then it is lapped in with lapping compound to a
smooth fit. the valve is then flushed, washed and
assembled. That is why quality valve manufacturers
can"t/won"t sell just a spool or valve body.
Remember..the valve has to be leak free from just
the metal to metal polished finish. If your valve is leaking internally, it"s time to replace the
whole valve. ALSO..good filtration = longer life!
Gresen is a very good quality valve. The process
discribed above may not apply to a $59.95 wood
splitter valve mfd. in a sweat shop in China.

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