I like to see the shutoff open all the way at the wall.
Sometimes the wall shutoff has a bad washer in it that flutters.
I recently replaced an old, clog prone toilet with Toto Drake. It works very well, never clogged since installed about 3 months ago. With Toto installation and new problem developed. When the tank fill valve shuts off after filling the tank, there is a loud waterhammer noise in the pipes. This was not an issue with the old toilet. Closing the fill pipe shutoff valve slightly decreases (but does not eliminate) the waterhammer and makes the tank filling noisier. I installed Sioux Chief mini-restor ballcock and it made things better, but waterhammer noise is still there. Would a second mini-resor( 2 in a series) help? Any other advice? Thanks you.
The shutoff valve was not altered when the new toilet was installed, yet the waterhammer problem developed. It was not an issue with the old toilet. The shutoff valve is acutally not at the toilet but a few feet away in side the wall in a panel. Is there a way to adjust the fill valve in the toilet to make it close slower? Would a second Sioux-Chief make a difference?
You cannot adjust the refill volume of the fill valve.
Toto's fill valves at designed to have a large volume flow allowing a faster refill but when they shutoff that is when the banging happens, the same is found with quarter turn faucets now a days.
Depending where your pipes are rattling (whole house) you may need to install a water hammer arrestor that will do the whole house usually installed at the cold water feed.
I had one customer whose plumber secured the pipes that were banging (just lucky they could get at them).
Not sure how long that would last though.