Re: Sprinklers - Pressure relief

["Bob La Londe" <nospam@xxxxxxxxx>]

"nick markowitz" <nick-markowitz@xxxxxxxxxxx> wrote in message
news:Q_awh.8445$SE6.7503@xxxxxxxxxxx
> All new sprinkler systems have a backflow prevention valve older systems
> had check valve

Ok, but how is the pressure relieved in a sprinkler system from the
expansion and contraction of the water trapped in the system?



> "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
>>
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