Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss
Rhythmic knocking in cold water supply line
3 views
Skip to first unread message
Charles Packer
Nov 10, 2009, 7:53:53 AM11/10/09
to
In the last couple of years a rhythmic knocking has
developed in our water supply lines when a toilet is
flushed. I thought there was something wrong with
the toilet fill valve, but then last summer I discovered
that it also happens when the outside spigot is turned
full on. The frequency is about three knocks per second,
but it increases if sink faucets are opened. Now I'm
wondering why a sink faucet alone _won't_ trigger
it. Anyway...any idea what's happening, and how to
get rid of it?
developed in our water supply lines when a toilet is
flushed. I thought there was something wrong with
the toilet fill valve, but then last summer I discovered
that it also happens when the outside spigot is turned
full on. The frequency is about three knocks per second,
but it increases if sink faucets are opened. Now I'm
wondering why a sink faucet alone _won't_ trigger
it. Anyway...any idea what's happening, and how to
get rid of it?
--
Charles Packer
http://cpacker.org/whatnews
mailboxATcpacker.org
GregS
Nov 10, 2009, 9:02:03 AM11/10/09
to
In article <0b8437c2-f8fb-485f...@d21g2000yqn.googlegroups.com>, Charles Packer <mai...@cpacker.org> wrote:
>In the last couple of years a rhythmic knocking has
>developed in our water supply lines when a toilet is
>flushed. I thought there was something wrong with
>the toilet fill valve, but then last summer I discovered
>that it also happens when the outside spigot is turned
>full on. The frequency is about three knocks per second,
>but it increases if sink faucets are opened. Now I'm
>wondering why a sink faucet alone _won't_ trigger
>it. Anyway...any idea what's happening, and how to
>get rid of it?
>
>In the last couple of years a rhythmic knocking has
>developed in our water supply lines when a toilet is
>flushed. I thought there was something wrong with
>the toilet fill valve, but then last summer I discovered
>that it also happens when the outside spigot is turned
>full on. The frequency is about three knocks per second,
>but it increases if sink faucets are opened. Now I'm
>wondering why a sink faucet alone _won't_ trigger
>it. Anyway...any idea what's happening, and how to
>get rid of it?
>
I replaced a washer in my laundry hot water valve, now I get
severe knocking at lower levels. The combinations
of valves and resonant pipes can cause problems. Get
to the pipes and fasten them down.
greg
0 new messages