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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> domestic hot water pumps https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1091816836 Message started by ynot47 on Aug 6^th, 2004, 7:27pm

Title: domestic hot water pumps
Post by ynot47 on Aug 6^th, 2004, 7:27pm

I'm fitting a pump on the hot water supply.
Question is do I need to fit a non return valve on the expansion pipe to prevent air being drawn into the system when the pump cuts in?
Pump is in the airing cupboard and there is approx 12 feet of head above the pump.
Any help would be appreciated

Tony

Title: Re: domestic hot water pumps
Post by PEDANTICVINDICTIVEMAN on Aug 6^th, 2004, 8:01pm

Dont put any valves of any type on the expansion pipe, if it jams, oeeeeeeerrrr.
Follow the makers installation instructions so as not to suck air down the pipe.

Title: Re: domestic hot water pumps
Post by thescruff on Aug 7^th, 2004, 12:38am

Had this once before on the PP forum.

Non-return valve = cylinder implodes if air cant get in :( :( :( :( :(.

scruff