Regular Mixing Valve
This mixing valve is inherent in many older homes from the 1980's through the 90's. It's used mostly on Oil burners with Forced Hot water and domestic hot water all in the same system, where a hot water heater is NOT used.
They tend to leak at the screw under the cap after about 5 years. If you have any minerals in your water you will see these turn a nice green color after the 5th to 10th year. The other problem with these is, they have a spring mechanism inside that under hard water conditions will fill up with sediment, usually white crystals that block the function of the valve.
Lastly the little cup at the bottom of the valve will just disintegrate over time, allowing more water to pass through the system. As well as the lower copper screw that sits at the bottom of the valve, will also disintegrate over time. These valves tend to require being changed every 7 to 10 years, and are NOT the last line in defense to prevent scalding of children. Your shower-head is a far better method in the prevention of scalding, as these will only last for about a year in terms of good heat regulation.
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