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Re: Is there such a thing as a reverse pressure relief valve?
Posted: Tue Nov 03, 2015 2:15 am
by mathjak107
mathjak107 wrote:
and the answer is :
ACV! Automatic Control Valve pressure controlled solenoid operated
boy my guys are good , even on a sunday i get answers .
i will be in the office wed if you need me to research it for you , that is my day of the month to go in .
i believe we have access to the watts line . see below cuts on the valves
http://media.wattswater.com/C-CACV.pdf
THE CATALOG LINK IS HERE
Re: Is there such a thing as a reverse pressure relief valve?
Posted: Tue Nov 03, 2015 8:49 am
by Pointedstick
Thanks mathjak. Those things are… heavy duty!
Re: Is there such a thing as a reverse pressure relief valve?
Posted: Tue Nov 03, 2015 8:57 am
by mathjak107
yes , the ones we use have to be precise and reliable .
before i retired i was a a designer of pump and motor controls both for the municipality's and the industrial's . i did a lot of water pumping stations and sewage treatment plants on long island .
anything we use has to be first rate . watts makes excellent products.
Re: Is there such a thing as a reverse pressure relief valve?
Posted: Tue Nov 03, 2015 3:39 pm
by Mark Leavy
PS, does the water circulating in the solar heater have to physically mix with the potable water in the house system? Can you use a closed circuit heat exchanger (i.e. coil of flex copper tubing) and put oil or a water/anti-freeze mix in the external circuit? I'm just brain storming simple and reliable...
Re: Is there such a thing as a reverse pressure relief valve?
Posted: Tue Nov 03, 2015 3:51 pm
by Pointedstick
Mark Leavy wrote:
PS, does the water circulating in the solar heater have to physically mix with the potable water in the house system? Can you use a closed circuit heat exchanger (i.e. coil of flex copper tubing) and put oil or a water/anti-freeze mix in the external circuit? I'm just brain storming simple and reliable...
That's the approach I'm moving towards. It solves two other problems, too: scale in the collectors and not meeting code by using the water heater for something it wasn't designed for.
Re: Is there such a thing as a reverse pressure relief valve?
Posted: Tue Nov 03, 2015 3:59 pm
by dragoncar
Pointedstick wrote:
Mark Leavy wrote:
PS, does the water circulating in the solar heater have to physically mix with the potable water in the house system? Can you use a closed circuit heat exchanger (i.e. coil of flex copper tubing) and put oil or a water/anti-freeze mix in the external circuit? I'm just brain storming simple and reliable...
That's the approach I'm moving towards. It solves two other problems, too: scale in the collectors and not meeting code by using the water heater for something it wasn't designed for.
Seems like a lot of work vs. slapping some electric panels up there and calling it a day. Do you have really high costs for hot water? I think I spend like $5/mo and it's mostly for the pilot light.
Re: Is there such a thing as a reverse pressure relief valve?
Posted: Tue Nov 03, 2015 5:19 pm
by Pointedstick
dragoncar wrote:
Seems like a lot of work vs. slapping some electric panels up there and calling it a day. Do you have really high costs for hot water? I think I spend like $5/mo and it's mostly for the pilot light.
Astute observations. My costs are similar, in fact. However $5 per month requires roughly $1,500 to permanently offset with investments, so any system that neutralizes that cost for less than $1,500 is cost-effective. Even more so if it lets you get rid of your gas bill entirely, which has the effect of eliminating the $10-30 base charge (another $3-9k reduction in investment needs). Furthermore, it makes you immune to inflation and price volatility in the natural gas market. Another advantage of a solar water heating system vs a solar photovoltaic system is grid independence. Grid-tied solar systems don't give you any power or heat your water if the power goes out.
Finally, I want to test the idea to get a sense of how simply, feasibly, reliably, and inexpensively a freeze-proof solar hot water system can be implemented en masse.