[pure-silver] Re: New old home, new lab questions

  • From: Tim Daneliuk <tundra@xxxxxxxxxxxxxx>
  • To: pure-silver@xxxxxxxxxxxxx
  • Date: Mon, 03 May 2010 10:35:11 -0500

On 5/3/2010 10:24 AM, Jean-David Beyer wrote:
> Tim Daneliuk wrote (in part):
> 
>> - If you end up doing some plumbing by tapping into the hot/cold mains
>>   another highly recommended things is to sweat in one-way valves
>>   when you do this. 
> 
> A regular check-valve is NOT the thing to use here, though. You will
> want an anti-backflow valve like this one:
> 
> http://www.caleffi.com/caleffi/sl_SI/Site/Products/Catalogue/args/sezione/Family040_Non_controllable_reduced_pressure_zone_backflow_preventer_with_removable_filter/path/5~573~573_FIL-details/include/~applications~catalog~serie.jsp/index.sdo
> 

Not quite sure what you mean by a "regular check valve".  The ones I installed
are not as fancy as the one above, but they are one-way valves to prevent
backflow.  IIRC, they were about $10 US each.

> 
> This is two check valves in series with an air vent.
> 
> Another approach is to use vacuum breakers, but you cannot subject them
> to continuous pressure unless you get them specifically designed for
> that. I have ball valves at the input to my darkroom, and turn them off
> when I am not using it. They need to be replaced every 20 years or so.
> 
>> That way, if you have a hose sitting in water
>>   in the darkroom and some backpressure is created in the mains, by, say,
>>   a toilet being flushed and refilled, the house won't pull your
>>   chemistry sodden water back up into the mains.  These valves are
>> inexpensive,
>>   but do have to be installed in a particular direction.  I learned this
>>   the hard way when the "expert" at the plumbing store gave me the exact
>>   wrong directions.   Also, if you plumb in a basement, remember to
>> install
>>   air columns at each faucet point to prevent pipe banging.
>>
>> If you're unsure about electrical/plumbing hire a pro...
>>   
> 
> 
> 


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Tim Daneliuk     tundra@xxxxxxxxxxxxxx
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