Pumukli
National Hazard
Posts: 686
Registered: 2-3-2014
Location: EU
Member Is Offline
Mood: No Mood
|
|
Vacuum pump connections
Hi there,
I have a rotary vane vacuum pump I bought a few years ago (a Leybold Trivac D2A to be precise).
I have only the pump but would need some sort of connector to attach a vacuum "hose" if I want to use it. (Which I do now.)
Problem is, the pump has a strange (for me) connector both for the vacuum and for the exhaust.
What are my options if I want to be able to use it? Where could I buy the proper attachments? What kind of "vacuum hose" should I use? Basically I
want to connect the vacuum side to various glassware while it would be nice if I could attach a simple plastic hose to the exhaust and vent the oil
aeorosol outside. If the solution would be inexpensive it would not hurt.
|
|
|
macckone
International Hazard
Posts: 2159
Registered: 1-3-2013
Location: Over a mile high
Member Is Offline
Mood: Electrical
|
|
The most likely connectors are those used on a/c systems.
Since you are in the EU, it is likely an EU standard.
If it is a pre-EU pump then good luck.
In the US the 1/4" flare is pretty standard but not universal.
|
|
|
monolithic
Hazard to Others
Posts: 435
Registered: 5-3-2018
Member Is Offline
Mood: No Mood
|
|
It looks like a KF16 flange. Something like this would work: https://www.ebay.com/itm/KF-16-NW-16-3-8-Hose-Barb-Adapter-V... You would also need the clamp that fits around both ends of the KF16 flange.
Most vacuum take off adapters on 24/40 glassware are ~10 mm. A 3/8" hose barb is 9.5 mm. I use 5/16" inner diameter hose which is 7.9 mm, so as to get
a good seal (the hose stretches.) You can buy purpose made vacuum pump hoses from a lab supplier, thick wall gum rubber tubing which is like
$5-7/foot, or you can take the "good enough" approach and buy something like this. https://www.ebay.com/itm/5-16-8mm-ID-Blue-Vacuum-Silicone-Tu... The wall diameter isn't nearly as thick as purpose made lab tubing but it won't,
in my experience, collapse on itself. It works fine for 99% of my uses like vacuum filtration on a diaphragm pump and vacuum distillation on a rotary
vane pump.
[Edited on 8-18-2020 by monolithic]
|
|
|
S.C. Wack
bibliomaster
Posts: 2419
Registered: 7-5-2004
Location: Cornworld, Central USA
Member Is Offline
Mood: Enhanced
|
|
...and o-ring that does not necessarily come with it. These clamps are a lot like other clamps; you get what you pay for. There are filters in that
size or an adapter can be used with a KF24 as well. I wouldn't spend a lot on a 2.2 cfm pump...maybe a towel?
|
|
|
Pumukli
National Hazard
Posts: 686
Registered: 2-3-2014
Location: EU
Member Is Offline
Mood: No Mood
|
|
Thanks Guys,
The "KF flange" key word did the trick. I definitely need a KF-type adaptor, I'll check the size. And two O-rings as well. And maybe a clamp too,
because I have only one. The "good enough" silicone tube approach will be well, good enough to start with. :-)
Maybe a towel? Yes, it would probably suffice, but I'd prefer to apply the towel somewhere outdoors, to the end of a hose. :-) Just to prevent vasps
building nest in the exhaust tubing. :-)
I got to the point where I want something purified by vacuum distillation. First I'll try to put together a "quick and dirty" recirculating aspirator
thingy (I have a glass aspirator and a good sized pump, need some fittings and tubes) and try to pull the compound off by aspirator vacuum. I have to
wait a few weeks probably for the KF-flange adapter and such anyway. Rest assured, I'll report how it went. :-)
|
|
|
Heptylene
Hazard to Others
Posts: 319
Registered: 22-10-2016
Member Is Offline
Mood: No Mood
|
|
Silicone tubing isn't great for vacuum, it tends to collapse in my experience. I can recommend PVC tubing instead, which maintains its shape. But it's
a bit tougher to fit on the glass hose barbs.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
