Bird Doo Head
Well-Known Member
Hello All!
I installed a Grohe Grotherm 3-Function valve for shower, hand held and tub spout. It is push-on, push-off. There is noticeable water hammer when pushing any button to turn the valve off, even at a low flow setting. The pipe straps are Upnor talons, so the pipes are not rigidly held.
I don't explain things too well, so a drawing is attached.
Due to framing, I can't install an arrestor, even AA size, at the valve.
My questions are if it is OK to install them some distance from the valve. Ideally, I will install pre-made piston type arrestors horizontally.
I can also install tube-and-cap ones by using a 1/4 street bend at the tee and sending the tubing up, but it will be rather short, ending before the valve. It will also have to curve around a bit. I'll use PEX. (Green in the drawing)
In the drawing I show two options for placement. One is in the basement & will be very accessible for service later. The other is in the wet wall. Access there is possible, but tedious. (It's a pantry closet wall that is removable in about an hour.) I've never had a pre-made on, so I don't know how often they have to be changed.
Question Two:
I also find conflicts in the fixture unit charts for the valve and for what each arrestor can handle. Will size AA work for a shower valve?
Thank You Very Much for helping clear up my confusion.
Paul
I installed a Grohe Grotherm 3-Function valve for shower, hand held and tub spout. It is push-on, push-off. There is noticeable water hammer when pushing any button to turn the valve off, even at a low flow setting. The pipe straps are Upnor talons, so the pipes are not rigidly held.
I don't explain things too well, so a drawing is attached.
Due to framing, I can't install an arrestor, even AA size, at the valve.
My questions are if it is OK to install them some distance from the valve. Ideally, I will install pre-made piston type arrestors horizontally.
I can also install tube-and-cap ones by using a 1/4 street bend at the tee and sending the tubing up, but it will be rather short, ending before the valve. It will also have to curve around a bit. I'll use PEX. (Green in the drawing)
In the drawing I show two options for placement. One is in the basement & will be very accessible for service later. The other is in the wet wall. Access there is possible, but tedious. (It's a pantry closet wall that is removable in about an hour.) I've never had a pre-made on, so I don't know how often they have to be changed.
Question Two:
I also find conflicts in the fixture unit charts for the valve and for what each arrestor can handle. Will size AA work for a shower valve?
Thank You Very Much for helping clear up my confusion.
Paul