OK, so ADA guy is already there, as I found when I posted this. Yes, it's a means for controlling the water, and I believe it has to do with not getting scalded, but again, still racking my brains.
I wonder how someone takes a shower in the fixed position? They have to hold the switch the whole time?
Also remember hearing hearing at the ANSI Committee meeting something about the water must also not completely shut off such that the pressure builds up and when you turn it on a large force is created to blow the water wand away or out of the person's hand.
Pressure buildup is not usually an issue unless local water pressure is excessive, in which case use of a pressure regulator is advised.
quote:Originally posted by BrentWiese:
oh my, i may have misunderstood the requirement.
are you saying the water out of the hose does not come out, until the user is pushing down a button or control? and then flow stops when that control is released?
The shower spray head should have a non-positive shut off valve so that when they let go, it will turn off.
from what you describe, then to have water, the user must hold down the button. that requires grasping and continuous pressure. for me, that would be uncomfortable, and for some users not possible.
They seem to have assumed that users would have the ability to pinch and grasp (or have an aide?).
I believe that the term refers to a handheld valve that makes the shower head continue to dribble water when the main valve on the wall is left on. This maintains positive water flow pressure so that water in the head and hose cannot backflow and siphon dirty tub water into the fresh water supply line if it is dropped into a tub with standing water. Remember that the hose has to be at least 59" long so it would fall to the floor of the tub if dropped. It's a plumbing safety requirement.