Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: Vacuum pump connections
Pumukli
International Hazard
*****




Posts: 610
Registered: 2-3-2014
Location: EU
Member Is Offline

Mood: No Mood

[*] posted on 18-8-2020 at 10:36
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.
View user's profile View All Posts By User
macckone
International Hazard
*****




Posts: 1761
Registered: 1-3-2013
Location: Over a mile high
Member Is Offline

Mood: Electrical

[*] posted on 18-8-2020 at 11:44


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.
View user's profile View All Posts By User
monolithic
National Hazard
****




Posts: 351
Registered: 5-3-2018
Member Is Offline

Mood: No Mood

[*] posted on 18-8-2020 at 14:16


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]
View user's profile View All Posts By User
S.C. Wack
bibliomaster
*****




Posts: 2171
Registered: 7-5-2004
Location: Cornworld, Central USA
Member Is Offline

Mood: Enhanced

[*] posted on 18-8-2020 at 17:25


Quote: Originally posted by monolithic  
You would also need the clamp that fits around both ends of the KF16 flange.


...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?




"You're going to be all right, kid...Everything's under control." Yossarian, to Snowden
View user's profile Visit user's homepage View All Posts By User
Pumukli
International Hazard
*****




Posts: 610
Registered: 2-3-2014
Location: EU
Member Is Offline

Mood: No Mood

[*] posted on 18-8-2020 at 22:32


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. :-)
View user's profile View All Posts By User
Heptylene
National Hazard
****




Posts: 319
Registered: 22-10-2016
Member Is Offline

Mood: No Mood

[*] posted on 19-8-2020 at 11:13


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.
View user's profile View All Posts By User

  Go To Top