Valve Spool and Bore Tolerances
Valve Spool and Bore Tolerances
(OP)
Can anyone point me to a good reference on acceptable cavity bore and spool OD tolerances for a pilot-operated spool moving in a closed-end cavity? The valve body is aluminum, the spool is mild steel. The system typically runs under 1,000 psi with AW-32 fluid.
We're changing vendors on the valve body machining, and would like to avoid over-specifying.
We're changing vendors on the valve body machining, and would like to avoid over-specifying.





RE: Valve Spool and Bore Tolerances
Engis supplies a lot of honing equipment for the auto and aircraft industry so they might be able to help you out with getting an economical bore for your end use.
http://www.engis.com/techsupport/bfcasestudy6.html
http://www.helicallap.com/
RE: Valve Spool and Bore Tolerances
Remember...
"If you don't use your head,
your going to have to use your feet."