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    raithatha's Avatar
    raithatha Posts: 2, Reputation: 1
    New Member
     
    #1

    Sep 7, 2008, 01:18 PM
    Constant drip from hot water cylinder
    There is a constant leak outside the house that I have traces to a blue topped valve. I believe it is a pressure relief valve. Do I have to replace the whole valve or can this be replaced?
    How do I make sure that it is the valve and not the pressure that is at fault?
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
     
    #2

    Sep 7, 2008, 03:08 PM
    Hi Raithatha:

    First I need to know if this a pressure relief valve from a boiler or a temperature and pressure relief valve from a water heater? If from a water heater is this a gas or an electric water heater?

    MARK
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
     
    #3

    Sep 7, 2008, 04:49 PM
    And next we would like to know if you have,
    1) a sprinkler system connected to the house service?
    2) a check valve or backflow preventer installed out near the water meter,
    3) a expansion tank installed on the cold water supply on the water heater?
    Let's hear back from you. Regards, Tom
    raithatha's Avatar
    raithatha Posts: 2, Reputation: 1
    New Member
     
    #4

    Sep 8, 2008, 12:53 PM
    Hi,

    Thanks for your replies. The valveis on an ordinary central heating boiler which has an emersion coil to heat the water as an option (never used).

    The property is a simple semi detached with no sprinklers. Not sure about a check valve or backflow preventer near the water meteer. I am not sure I would know one if I saw one! - sorry. There is an expansion tank installed. Does thid help?
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
     
    #5

    Sep 8, 2008, 02:07 PM
    Raithatha...

    All helped.. yes.

    Are you familiar with your boiler system... the shutoffs, valves, vents, etc.

    Is this a forced water boiler (pump present) or a steam bolier? Can you tell me what the PRESSURE reading is on the boiler? There should be a gauge at front, or on top of boiler.

    This issue is either related to a defective fill valve (pressure regulator valve) or could just be the pressure relief valve itself.

    Sorry for all the questions... but now that we know it is a boiler we are closer than we were before.

    Answer questions...

    MARK

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