Humboldt H-2786C Air Meter User Manual
Page 5
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3. Maintenance of the “hands-free” valve:
Unscrew the valve stem from the valve body using the top brass
hex nut. Using a coarse piece of emery cloth or sandpaper, remove
the debris and wear lines on the brass valve taper with 2 or 3 quick
sandings. One, or two quick polishes with 500 emery cloth finishes
the cleaning. Coat the valve taper with white lithium or plumber's
grease. Before returning the valve stem to the valve, ensure that the
valve hole is clear all the way through to the underside of the cover.
Screw the valve stem back into the valve.
4. If the “hands-free” valve continues to leak, put the air meter cover
on a flat surface and strike the top of the valve with a direct hammer
blow. You may need to turn the top handle once or twice to tighten
it down. Repeat if leaks persist.
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