Mixing Valve Safety Concern in the Event of Failure

Mixing valve safety concern in the event of failure

PostBy: lsayre On: Wed Nov 20, 2013 2:08 pm

I'm entering into my third year of supplying hot water to our home via an internal boiler coil and a mixing valve, and I've been wondering about if these mixing valves ever fail (which everything made by man seems to do at some juncture), and if they do fail, do they typically tend to fail to the cold side (which would be disturbing, but safe), or to the hot side (which could be seriously dangerous, particularly if you a showering when it happens)? Or can they randomly fail to either the hot or the cold side? My mixing valve is a Taco.
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

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Re: Mixing valve safety concern in the event of failure

PostBy: coalkirk On: Wed Nov 20, 2013 3:47 pm

I have not known these valves to fail in the manner you describe. The only failure I'm aware of would be a failure to adjust should you wish to change water temperatures. Basically they can stick. Others with more knowledge will chime in I'm sure.
You can also install scald proof faucets in the shower for another layer of safety.
Stoker Coal Boiler: 1981 EFM DF520
Coal Size/Type: anthracite/rice coal