本帖最後由 Amuro0079 於 2012-2-13 02:22 編輯
回復 41# hgcjeffrey
BTW, this what the Koolance rep said about orientation of the pump being upside down:
Laing's literature mentions to avoid upside-down pumps, but we've been doing this for 6 years (PC4, RP-1000, ERM-3K4U5, RP-980/1005/985/401X2). I think it's to help avoid cavitation because they're not self-priming. I would guess that friction on the ceramic impeller bearing is actually less when inverted. Regardless of the reasoning, we've never had an issue running pumps this way as long as they're burped when filling.
Tim
According to Oliver Laing, the inverted orientation is not recommended to avoid issues with air. If you burp the pump before running it, there shouldn't be any problem. We haven't encountered any difference in pump failure between our products with upright pumps versus upside-down, even after tens of thousands of pumps. For performance, our RP-401X2 was designed for two inverted DDC pumps, which Martin listed as his "highest performing Koolance top tested to date".
I understand having air bubbles going through a pump until bled is extremely annoying, but individual systems vary in bleeding requirements and installation technique. There are alternative ways to avoid air going through a component if it's proving more difficult, including placing a fill port elsewhere in the system. It's no comfort to those experiencing problems, but the vast majority of RP-452X2 users are getting their Rev.1.0-1.3 units to bleed.
Tim
http://www.xtremesystems.org/for ... t-V2-quot-Koolance-*Dual-D-5*-Bay-Reservoir!-%28RP-452X2%29&p=5037938&viewfull=1#post5037938 |