– Ben Martens

Moen Posi-Temp Valve

We’re about four months past the end of our bathroom model and I’m still very happy with the result. There’s not much, if anything, that I would change if we were doing it again. One of my favorite features is turning out to be the Moen Posi-Temp shower valve. I didn’t think much about it when I picked it out, but this thing works wonders.

If you’re in our other shower and someone turns on the hot water anywhere else in the house, you get a shot of cold water and the opposite is true for them flushing the toilet, etc. With the Posi-Temp valve, you can’t tell at all! I’ve been searching for a good diagram to show how it works, but this is the best answer I’ve found so far:

The balancing spool may be either within the cartridge or in a separate spool cartridge. If the pressure of water coming in on the cold side suddenly drops it will cause the spool to shift and reduce the incoming hot water thus balancing the pressure (and the temperature).

I’d love to take one of these apart some time and see how it’s put together. But regardless, this thing is magic and I highly recommend it if you’re changing out your plumbing valves.