I have a shower, and it has one knob. This knob controls the temp as well as flow. I have it because it is so touchy, one little move to the left and it's scalding, one tiny tip to the right and it's demonically cold! Trying to adjust the pressure by moving the knob up and down also messes the temp, unless you are a magician and you can bring it up or down perfectly straight!
I want a setup that has temp control and flow separate. Is that possible to do? When my shower was leaking, I had to change the gaskets, and it involved pulling the cover off the shower wall, and extracting something the guy at Lowe's called "fat man", because it looks vaguely like a heft little man standing up. This was the guts of the shower.
I hope this enough information, what I am hoping is that showers are mostly plumbed up the same way, and once you get to a certain point, you can install whateve you want for faucet control.
If you want all those features you would have to replace the whole valve. And no there not all the same.
Some have soldered conections, some have threads, some have unions.
About how old is the one you have now? Newer ones will have a build in anti scald valve.
I'd be inclined to take your valve stem apart agin and see if somethings missing, broken, loose. It should not be as senitive as yours seems to be.
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