Heidolph Hei-VAP Value Operating Manual page 41

Assembly
Distributor is mounted.
Turn re ux valve clockwise until O-ring
is clearly visible and white plug blocks
output to receiving ask.
Valve is closed and sample ows back
to evaporating ask.
Turn re ux valve counter clockwise
until white plug unblocks the output of
receiving ask.
Valve is open and sample ows into
receiving ask.
(For inlet valve and inlet tube see chapter
"Assembly, Inlet tubes".)
The system is not vacuum-tight if valve is opened too far. Open valve
only in a way that the white seal ring beneath knurled screw remains
visible 0.5 cm wide.
Ventilation cap
Inlet valve Distributor
Re ux valve
O-ring