How is the side vent finished?
I assume it's not a ground joint under there, so is it just like a rubber cap on a beaded tube or something else?
Beaded tubes I usually think of as for hoses.
Perhaps the vent goes to a hose to the vac pump to rapidly re-establish vacuum after draining the flask.
Since there's virtually no space for distillate to accumulate above the top valve (I'm assuming your condenser is a common style), it might be
important to evacuate that flask quickly so you can start collecting distillate instead of it just running back into the boiling flask.
This is a hypothesis based entirely on what I see here. I haven't seen anything like it on a rotovap before.
EDIT: But here is what looks like a similarly functioning
fitting:https://www.ebay.com/itm/USA-Lab-50L-Rotary-Evaporator-RotoVap-RE-1050-180-C-220V/401655360968?hash=item5d84866dc8:g:Zt0AAOSwIfFdufmN
The rotovaps I've looked at before were mostly ones I thought I might buy: cheap simple ones.
You've got a Ferrari and some of the parts just don't look like the ones on the Studebakers I've been looking at.
Okay, that picture didn't work, but this link should:
[Edited on 28-6-2020 by SWIM] |