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Pressure release valve

  • 22-01-2012 1:29pm
    #1
    juuge
    Closed Accounts Posts: 792 ✭✭✭


    I've got a pressure release valve close to the central heating boiler (oil) in the garage and I've noticed that when the system has been running for an hour or so the pressure release valve begins dripping water. Would this be a faulty valve (20 years installed) or something more serious? Thanks


Comments

  • #2
    aujopimur
    Registered Users, Registered Users 2 Posts: 3,953 ✭✭✭aujopimur


    If you have an open system (header tank in the attic) and your heating is working ok, I'd say your SV needs replacing.


  • #3
    juuge
    Closed Accounts Posts: 792 ✭✭✭juuge


    aujopimur wrote: »
    If you have an open system (header tank in the attic) and your heating is working ok, I'd say your SV needs replacing.

    No I don't have a header tank in the attic it's a sealed system and it seems to be working fine.


  • #4
    gdavis
    Registered Users, Registered Users 2 Posts: 771 ✭✭✭gdavis


    is pressure reaching 3 bar?


  • #5
    juuge
    Closed Accounts Posts: 792 ✭✭✭juuge


    gdavis wrote: »
    is pressure reaching 3 bar?
    Yeah the pressure gauge is just below three bar


  • #6
    Outkast_IRE
    Registered Users, Registered Users 2 Posts: 7,516 ✭✭✭Outkast_IRE


    juuge wrote: »
    Yeah the pressure gauge is just below three bar
    then there is two possibilites the syatem pressure is topped up too high to begin with . What does the pressure guage read when system is fully cold ?

    or

    Expansion Vessel may of failed , just tell what the system pressure is when its fully cold and we can work from there.


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  • #7
    juuge
    Closed Accounts Posts: 792 ✭✭✭juuge


    Outkast_IRE wrote: »
    then there is two possibilites the syatem pressure is topped up too high to begin with . What does the pressure guage read when system is fully cold ?

    or

    Expansion Vessel may of failed , just tell what the system pressure is when its fully cold and we can work from there.
    OK will do....I've switched the system off as soon as it's cold I'll check the pressure Thanks


  • #8
    Outkast_IRE
    Registered Users, Registered Users 2 Posts: 7,516 ✭✭✭Outkast_IRE


    juuge wrote: »
    OK will do....I've switched the system off as soon as it's cold I'll check the pressure Thanks
    Usually a system is between 1 and 1.5 bar when cold , if it sits any higher than this when fully cold then it may be overfilled.

    It will take a good few hours to cool fully .


  • #9
    juuge
    Closed Accounts Posts: 792 ✭✭✭juuge


    Outkast_IRE wrote: »
    Usually a system is between 1 and 1.5 bar when cold , if it sits any higher than this when fully cold then it may be overfilled.
    I noticed that the valve for filling the system was fully open - should it be? It's been ages since anyone was in the attic so it's been like that for a while.


  • #10
    Outkast_IRE
    Registered Users, Registered Users 2 Posts: 7,516 ✭✭✭Outkast_IRE


    juuge wrote: »
    I noticed that the valve for filling the system was fully open - should it be? It's been ages since anyone was in the attic so it's been like that for a while.
    No if thats definately the valve for filling the heating it should not be left open all the time .


  • #11
    juuge
    Closed Accounts Posts: 792 ✭✭✭juuge


    Outkast_IRE wrote: »
    No if thats definately the valve for filling the heating it should not be left open all the time .
    Yes it is the valve and it's open all the time.


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  • #12
    Billy Bunting
    Registered Users, Registered Users 2 Posts: 2,842 ✭✭✭Billy Bunting


    juuge wrote: »
    Yes it is the valve and it's open all the time.

    Sounds like you just found the problem. :D


  • #13
    juuge
    Closed Accounts Posts: 792 ✭✭✭juuge


    Billy Bunting wrote: »
    Sounds like you just found the problem. :D
    Wouldn't that be great. If I close that valve should the pressure on the gauge drop quickly or will it take a while?


  • #14
    Outkast_IRE
    Registered Users, Registered Users 2 Posts: 7,516 ✭✭✭Outkast_IRE


    juuge wrote: »
    Wouldn't that be great. If I close that valve should the pressure on the gauge drop quickly or will it take a while?
    Really it shouldnt drop , as you have a sealed system , the only place it should of escaped before is the pressure release valve, whats the pressure at now that you have turned the valve off ?

    If its not between 1 and say 1.75 i would reccomend releasing some water from the system.


  • #15
    juuge
    Closed Accounts Posts: 792 ✭✭✭juuge


    Outkast_IRE wrote: »
    Really it shouldnt drop , as you have a sealed system , the only place it should of escaped before is the pressure release valve, whats the pressure at now that you have turned the valve off ?

    If its not between 1 and say 1.75 i would reccomend releasing some water from the system.
    OK It's reading 2 bar at the moment. I just drained off about a litre and the gauge is resting at 1.5 bar.


  • #16
    Outkast_IRE
    Registered Users, Registered Users 2 Posts: 7,516 ✭✭✭Outkast_IRE


    juuge wrote: »
    OK It's reading 2 bar at the moment.
    To me thats a little higher than i like it on systems.

    Do you have a dedicated drainoff valve anywhere on the system ? if not then

    Do you know how to bleed rads ? if you have a rad you can easily bleed and easily catch the water under then i would use the bleed screw to leave out some water ?

    but either way i would take it down to 1.5 bar pressure , and then see how high it gets when system is fully hot.


  • #17
    juuge
    Closed Accounts Posts: 792 ✭✭✭juuge


    Outkast_IRE wrote: »
    To me thats a little higher than i like it on systems.

    Do you have a dedicated drainoff valve anywhere on the system ? if not then

    Do you know how to bleed rads ? if you have a rad you can easily bleed and easily catch the water under then i would use the bleed screw to leave out some water ?

    but either way i would take it down to 1.5 bar pressure , and then see how high it gets when system is fully hot.
    Ok Thanks for that.


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