Solar well control [RE-wrenches]

[Matt Tritt]

<x-flowed>


Diaphragm? Did you say /diaphragm /pump? Sorry, I suppose I've been 
working with progressive cavity for long enough to have allowed 
everything else to fall to the background. When I (am forced to) sell a 
DP that's anything but open discharge, I push running a pair to a float 
switch as the best approach, and this is mainly because of the cost of a 
Cla valve being more than the pump. I installed my first one of these 
things in '78, but it was a 1.5", and cost a lot.

I've been interested in Mono pumps for the past couple years, since they 
have an internal pressure switch that works directly with the 
controller, are all progressive-cavity and have a bunch of other 
features that appeal to the techie in me a lot. Can't say I like the 
"all or nothing" approach that Grundfos has, with their internal 
controller-inverter, and my guess is that if Mono is good enough to be 
copied by a number of other companies, they're probably pretty good, 
which is why we picked up their distribution

Matt T

Jeff Oldham wrote:

>I've been using and loving Cla Valves for almost 30 years with extreme reliability. And yes they cost a lot with the 1/2" model in the $300 range. I'm not as comfortable as Matt is with running a pump w/o this valve or a modest (say 15 gal.) pressure tank at least. The issue I see is when the tank is 95-99% full and a standard float valve is mostly closed - at this point the pump can remain in this condition for a very long time trying to top off the tank and using maximum power to trickle water into the tank, in a solar direct application you may not top it off before sundown (but it will be "mostly" full). If this is a SDS pump with a diaphram then this method can torture the poor diaphram as it will spend most of it's time at the upper pressure limit of the pump, this can lead to premature failure of the diaphram due to the constant stress on it and failed diaphrams can lead to additional expensive issues not to mention pulling the darn pump. At least the internal bypass will stay well flushed out! Then there is the pressure switch cycling making DC arcs on the contacts like the 4th of July, again leading to a shorter life.
>Just saving one single pump pull and rebuild will pay for the Cla-Val and create a MUCH happier customer as icing on the cake. Do keep in mind even w/the Cla-Val you should still, use a pressure tank, but under these conditions it can be a little 2 gal.
>Good luck with your venture into underground headaches!
>-jeff o
>
>
>>From the Solar, Wind and Hydro powered office of Jeff Oldham/Regenerative SOLutions
>
>_____________________________________________________________
>Love Graphic Design? Find a school near you. Click Now.
>http://thirdpartyoffers.juno.com/TGL2111/fc/Ioyw6iigksdyLSdHICQMhMvNoSBfI3aBHiOuvKRVAeOKUGoQa2wuK6/
>
>[Non-text portions of this message have been removed]
>
>
>- - - -
>Hosted by Home Power magazine
>
>To send a message: RE-wrenches at topica.com
>
>Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read
>
>List rules & how to change your email address: www.mrsharkey.com/wrenches/etiquette.php
>
>Check out participant bios: www.mrsharkey.com/wrenches/
>
>Moderator: michael.welch at homepower.com
>
>
>
>
>  
>

[Non-text portions of this message have been removed]


- - - -
Hosted by Home Power magazine

To send a message: RE-wrenches at topica.com

Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read

List rules & how to change your email address: www.mrsharkey.com/wrenches/etiquette.php

Check out participant bios: www.mrsharkey.com/wrenches/

Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael.welch at re-wrenches.org

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

For Topica's complete suite of email marketing solutions visit:
http://www.topica.com/?p=TEXFOOTER
--^----------------------------------------------------------------


</x-flowed>