whats the difference between...

Discussion in 'Plumbing and Central Heating' started by Dave2010, 1 Apr 2012.

  1. Dave2010

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    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 :)

    thanks as always.
     
  2. Boilerman2

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    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 ;)
     
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  3. onlyfitidealboilers

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    You doing a plumbing course lol
     
  4. Dave2010

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    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 :confused:
     

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