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Dave2010

from United Kingdom

Joined: 29 Oct 2009
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Location: United Kingdom
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PostPosted: Sun Apr 01, 2012 7:45 pm Reply with quote

I know what 3 way/diverter/mid-position valves are with the motorised heads on but I am wondering about the diverter valves that contain a diaphragm and what the obvious differences are as to their use? (apart from looks)
I have read about how they work and understand this but what, when, where and why etc
Do systems use both?
Are 3 way only used if you have a hot water tank?

Any advice would be great icon_smile.gif

thanks as always.
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Boilerman2

from United Kingdom

Joined: 10 Jun 2009
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PostPosted: Sun Apr 01, 2012 9:06 pm Reply with quote

A Diaphragm operated Diverter valve is commonly found on older Combi boilers, opening a hot tap causes a pressure drop across the diaphragm which results in the diverter valve shunting to the hot water port

A 3 port Mid position valve is an entirely diffrent unit, it is designed to be electrically controlled, and supply heat to either heating radiators or a hot water cylinder , or both.

Sometimes you will find an electrically operated Diverter valve on newer design Combi's A Diverter valve can only heat hot water or Heating one at a time, a Mid position valve can do as mentioned AND Both simultainously if required icon_wink.gif
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Dave2010 (2 Apr 2012), libby lou lou (1 Apr 2012)
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onlyfitidealboilers

from United Kingdom

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Location: Aberdeen,
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PostPosted: Sun Apr 01, 2012 9:18 pm Reply with quote

You doing a plumbing course lol
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Dave2010

from United Kingdom

Joined: 29 Oct 2009
Posts: 165
Location: United Kingdom
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PostPosted: Mon Apr 02, 2012 5:41 pm Reply with quote

onlyfitidealboilers wrote:
You doing a plumbing course lol


no mate. Was just a passing comment from a friend who had his replaced And to be honest I was not even aware of them icon_confused.gif
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