What does a Diverter Valve do ?

Discussion in 'Plumbing and Central Heating' started by tvrjohn, 11 Jan 2010.

  1. tvrjohn

    Joined:
    27 Sep 2007
    Messages:
    40
    Thanks Received:
    0
    Location:
    Lancashire
    Country:
    United Kingdom
    Hi
    and what are the faults with them ?

    Having issue with 28cdi Worcester Combi
     
  2. Al-Glasgow

    Joined:
    30 Jan 2006
    Messages:
    436
    Thanks Received:
    15
    Location:
    Glasgow
    Country:
    United Kingdom
    Its a valve that is triggered to activate HW or Heat.

    I guess you have HW and no heating or other way round.

    There is a good chance it will fail at one point
     
  3. MANDATE

    Joined:
    6 Mar 2003
    Messages:
    2,307
    Thanks Received:
    130
    Location:
    Manchester
    Country:
    United Kingdom
    The Halstead ace boiler I think is typical.
    There is a 'diverter valve' which is movable to the left. When moved it diverts the water from CH circuit to the HW circuit (heat exchanger)
    At the end of its travel the valve triggers a microswitch.
    You can see a faulty micro switch or a sticky valve and you have problems.
    But the main problem is related to the 'diaphram operated switch Assy'.
    It's this Assembly that moves the valve. How?
    The Diaphram has mains water on both sides of it. When the hot tap is opened the pressure on one side is reduced. This allows the pressure on the opposite side to push the valve across. If this diaphram is split/holed the higher pressure water passes to lower pressure side. The result being the valve does not move or may move slightly, but not sufficient to light boiler.
    This I believe accounts for many problems when no HW on a combi
     
  4. tvrjohn

    Joined:
    27 Sep 2007
    Messages:
    40
    Thanks Received:
    0
    Location:
    Lancashire
    Country:
    United Kingdom
    Thank you for the Explanation :D
     
  5. olly_k

    Joined:
    14 May 2005
    Messages:
    264
    Thanks Received:
    6
    Country:
    United Kingdom
    I repaired a diaphragm on a Vailant boiler quite an easy job apart from the rusted screws! Had to do both diaphragms.
     
  6. Agile

    Joined:
    26 Jun 2004
    Messages:
    55,753
    Thanks Received:
    3,671
    Location:
    London
    Country:
    United Kingdom
    The Halstead Ace is the best kind of diverter valve.

    The most common type as used on Worcesters have a manifold section which has to follow the DHW bit under spring pressure and often gets stuck but you cannot see what its doing.

    Tony
     
  7. jon0881

    Joined:
    12 Jan 2010
    Messages:
    34
    Thanks Received:
    0
    Location:
    Lancashire
    Country:
    United Kingdom
    Mine has gone one further and leaked water out of it and into the plug which is popping the 3A fuse.
     

Share This Page