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 or
lemon-manuals.org.ua
(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)
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Vacuum Check Valve: Testing and Inspection
To check
vacuum check valve, use a suitable hand held
vacuum pump and apply 16 inches Hg vacuum to the check portion of valve. Maintain vacuum. If vacuum applied remains above 15 inches Hg vacuum for approximately 10 seconds, the vacuum check valve is operating properly. If not, replace vacuum check valve.