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Re: Sprinklers - Pressure relief

Subject: Re: Sprinklers - Pressure relief
From: "nick markowitz" <nick-markowitz@xxxxxxxxxxx>
Date: Thu, 01 Feb 2007 01:02:40 GMT
Newsgroups: alt.security.alarms
References: <45c10fe3$0$1845$88260bb3@xxxxxxxxxxxxxxxxx>

All new sprinkler systems have a backflow prevention valve older systems had
check valve
"Bob La Londe" <nospam@xxxxxxxxx> wrote in message
news:45c10fe3$0$1845$88260bb3@xxxxxxxxxxxxxxxxxxxx
> Since water expands and contracts and there is a check valve or anti
> backflow valve how is that pressure relieved
>
>
>
>
> --
> Posted via a free Usenet account from http://www.teranews.com
>

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