BÜCHI Labortechnik AG
Installation | 5
Operation Manual Rotavapor® R-300
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5.4
Fitting the glass stopcock
3
4
1
2
Fig. 7: Cooling condenser with glass stopcock and backfeed tube
1
Glass stopcock
3
Glass stopcock handle
2
Flat face on glass stopcock
4
Solvent backfeed (tubing)
Materials required:
Glisseal 40 red laboratory grease
u
Feed the tube on the glass stopcock (1) through the vapor duct and into the
evaporating flask.
u
If necessary, connect the backfeed tube for solvent (4).
u
Coat the ground joint of the glass stopcock with Glisseal 40 red laboratory grease.
u
Insert glass stopcock into the cooling condenser and turn to the desired position.
The glass stopcock performs various functions depending on its position:
Glass stopcock handle pointing right/forwards: the system is sealed.This is the
standard position for distillation.
Glass stopcock handle pointing left/rearwards: system is being vented.
Glass stopcock handle pointing downwards: additional solvent can be fed into the
evaporating flask via a connected backfeed tube.
