tag:blogger.com,1999:blog-4387100009341358284.post6670803307486343744..comments2024-03-12T09:55:15.923+01:00Comments on Curly Arrow: Vacuum Control - updated!Daniel Sejerhttp://www.blogger.com/profile/12498255536497699232noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-4387100009341358284.post-8394313522854155462013-02-05T13:43:36.405+01:002013-02-05T13:43:36.405+01:00One of the major advantages of the rotary vane pum...One of the major advantages of the rotary vane pumps is that the design readily lends itself to become a variable displacement pump, rather than a fixed displacement pump such as a spur-gear (X-X) or a gerotor (I-X) pump. The centerline distance from the rotor to the eccentric ring is used to determine the pump's displacement.<br /><br />thanks a lot for sharing<br /><a href="http://Anonymoushttps://www.blogger.com/profile/09036999944423781461noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-63450829699170231042010-09-28T06:12:15.633+02:002010-09-28T06:12:15.633+02:00If the pressure is rising that quickly, you're...If the pressure is rising that quickly, you're probably going too low and the trap isn't cold / effective enough.<br /><br />If the lab purchaser pays Buchi for their V series pumps, then a controller, they're an idiot.<br /><br />It's also questionable if you connect any dual stage rotary vane to a solvent boil off in the first place, let alone a diffusion (as are run on quite a Johnhttps://www.blogger.com/profile/12028261077084460273noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-42748106549105381872008-08-15T08:05:00.000+02:002008-08-15T08:05:00.000+02:00Yes, I think that your are missing the point. Full...Yes, I think that your are missing the point. Full vaccum, controlled vacuum, system isolated by the turn of a tap. Each operation takes half a second. Very simple to use and easily beats messing around with any conventional tap. Also the capillary tube ensures the optimum destillation speed every time. The needle valves I normally use are expensive (compared to this piece of glass ware) so if Daniel Sejerhttps://www.blogger.com/profile/12498255536497699232noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-62696279222762383292008-06-16T22:34:00.000+02:002008-06-16T22:34:00.000+02:00Did you ever hear about needle valves? Cheap to bu...Did you ever hear about needle valves? Cheap to buy, do exactly the same job at much lesser cost. I really don't see the point in this glass device, maybe I'm missing something...<BR/>regards,<BR/>j.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-22762402753757000992008-05-31T00:17:00.000+02:002008-05-31T00:17:00.000+02:00Daniel,thanks for bringing this "trick" to a wide...Daniel,<BR/><BR/>thanks for bringing this "trick" to a wider audience and for digging up a paper on it. <BR/>I have been using a similar setup for a while, it is pretty much an all-glass version of what the article describes. Might be a bit cheaper than the one you show due to the simpler valve. <BR/><BR/>I also find that having just one diameter of capillary does not work for all solvents. TheUnknownhttps://www.blogger.com/profile/09318663535229606283noreply@blogger.comtag:blogger.com,1999:blog-4387100009341358284.post-74034982221794852332008-05-25T06:47:00.000+02:002008-05-25T06:47:00.000+02:00Hi Daniel! Good luck in your move. Hope the see mo...Hi Daniel! Good luck in your move. Hope the see more goodies from you soon. Take care.Anonymousnoreply@blogger.com