cisternplumbingtoilet
I've noticed some cisterns have siphon units that are not secured at the top. Every time the toilet is flushed, the top of the siphon moves or tilts to one side. For example, in the following youtube video.
https://www.youtube.com/watch?v=ijVUCgAWTF4
Is this part of normal operation, or is there is any merit to securing the siphon in these cases?
Turns out the loud noise was caused by water rushing from other fixtures. The house had galvanized steel pipe as the main feed line (off the meter) which had become restricted, so when the toilet could not pull enough water from the main line it sucked it from other lines.
Replacing the galvanized pipe fixed the issue (as well as increased the pressure to the entire house).
It seems as if you have an obstruction that may be floating around in the pipe or valve. Sometimes it obstructs sometimes it flows clear. I would start with changing the water valve. If this is the old style "gate" valve there are several things that can clog the line. I would replace it with a 1/4 turn ball valve. That will give you much better flow than a gate valve. You will need to shut down the water probably at the main. The old valve is probably soldered, but you could cut it off and use a compression type valve instead. "Sharkbite" is one such supplier. Although I have never used their compression valve, I have used their end caps and found them to work well.
If you can have someone hold a bucket under the pipe once you cut off the valve and then a second person turns on the water main to fill the bucket to purge the line of any debris. With cast iron pipes it is common to get clogs from rust build up. The rust may not pass the small opening in the old gate valve when you first purged the line.. Although you did not mention what type of pipes you have, if it's copper than you won't normally find rust obstructions..
Best Answer
That's going to depend on the type of valve and the material it's made of. In your video, the valve moves because of the force to lift the flapper. That's normal. You just have to make sure the valve is tightened to the tank correctly so water doesn't leak out each time you flush and the valve moves. There i no reason to try and design a method to secure it, just install it correctly.