Manuals through 2025 now available!
Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.
LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
lemon-manuals.la
If it fails:
lemon-manuals.org.ua
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temporarily or
permanently
Vacuum Check Valve: Testing and Inspection
Vacuum Check Valve:
Apply
54 kPa (16 in Hg) vacuum to "check" side of the valve and trap. If vacuum remains above
50 kPa (15 in Hg) for
10 seconds, the valve is acceptable.