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double check valve requirements for incoming mains.

Discuss double check valve requirements for incoming mains. at UK Plumbers Forums; Hi all, current job to replace old lead incoming mains for 25mm poly pipe, from the meter in front garden to kitchen at back of house, 3 bed semi with ...
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    Default double check valve requirements for incoming mains.

    Hi all,
    current job to replace old lead incoming mains for 25mm poly pipe, from the meter in front garden to kitchen at back of house, 3 bed semi with a combi boiler,
    !question! do I need to include a double check valve on the incoming mains water valve arrangement.
    many thanks

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    Default Re: double check valve requirements for incoming mains.

    your meter will act as a non return valve, but you will require a small expansion vessel (150ml) to take up thermal expansion
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    Default Re: double check valve requirements for incoming mains.

    No Tom you don't need one,
    With all due respect if you are going to start messing around with water / water mains you really do need to do the Water Reg's course, then you be able to self cert & know what is & isn't required.

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    Default Re: double check valve requirements for incoming mains.

    Yes true, it's a one off job I don't normally touch domestic, but didn't want to install incorrectly, think I'll pass this one off to a local plumber then.
    Thanks guys

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