Automotive thermostats would run far too hot (they're usually in the 85 to 95 deg range)
You should be able to use a standard TMV (Thermostatic Mixing Valve of the type used for preventing hot water at taps and/or showers being scalding hot) backwards by connecting the heat source output to the *output* side of the TMV. When the water from the source rises above the set temperature, it will flow out of the TMV's cold water inlet. You would need to blank off the hot water inlet. Eg; http://www.screwfix.com/prods/31639/Plumbing/Brassware/Prestex-Peglertherm-D ual-Valve-15mm-22mm A better bet in some ways, because it's designed to work this way round, would be a solar system diverter valve. One of these will send the inlet water to either a cold outlet or a hot outlet depending on whether it is below or above the preset temperature. Again, you could simply blank off the cold outlet. However, these valves are generally factory preset for temperature and they're a bit harder to track down HTH Bru > -----Original Message----- > From: [email protected] [mailto:[email protected]] > On Behalf Of John > Sent: 01 February 2009 19:44 > To: [email protected] > Subject: Re: [canals-list] Plumbing parts > > Lee enquired: > .... how does the thermostat on a older type car work? Would that > stop/allow water along a pipe. > > An engine thermostat is closed when cold and this allows the coolant to > circulate around the engine only. Once the coolant has reached the cut- > off temperature, the thermostat opens, allowing the coolant to > circulate around the heating system. This enables the engine to reach > it's operating temperature faster. > I am not sure how you could incorporate this into the system that you > have on the boat, though. You can get differing temperature thermostats > from a Motor Factors. > Sorry I cant be off further help, but I'm sure someone will be along > who can, maybe help. > > Good luck > > John nb Charlotte Rose > > > > [Non-text portions of this message have been removed] > > > ------------------------------------ > > Yahoo! Groups Links > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.0.233 / Virus Database: 270.10.14/1920 - Release Date: > 01/27/09 18:15:00
