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Automatic pressure reducing valve

Butch_2
Butch_2 Member Posts: 8
in THE MAIN WALL
What is the purpose of an automatic pressure reducing vavle? This valve is right after my valve to put water into my boiler. Should my water valve be open or closed all the time? This is probably a stupid question, but I just don't know the answer to it. Thanks in advance for your answers.

Butch

Comments

  • Butch_2
    Butch_2 Member Posts: 8
    automatic pressure reducing valve

    What is the purpose of an automatic pressure reducing vavle? This valve is right after my valve to put water into my boiler. Should my water valve be open or closed all the time? This is probably a stupid question, but I just don't know the answer to it. Thanks in advance for your answers.

    Butch
  • Butch_2
    Butch_2 Member Posts: 8
    automatic pressure reducing valve

    What is the purpose of an automatic pressure reducing vavle? This valve is right after my valve to put water into my boiler. Should my water valve be open or closed all the time? This is probably a stupid question, but I just don't know the answer to it. Thanks in advance for your answers.

    Butch
  • Eric Taylor_37
    Eric Taylor_37 Member Posts: 19
    no such thing

    as a stupid question.

    The PRV sets the system pressure lower than the water supply pressure. The relief valve on your boiler is set to pop at 30 psi to protect the boiler and you only need enough pressure in the system to raise the water up to the highest point--typically 12-15 psi.

    You should leave the make up valve open if your system looses pressure after a while when it is closed. If you have a tight system it can be kept closed if you keep an eye on things.

    Wouldn't hurt to call a pro in to check things out either.

    Eric
  • Al Letellier
    Al Letellier Member Posts: 781
    PRV

    Just a added comment about leaving the valve open or closed.
    Do not, under any circumstances, leave the valve closed if you boiler is not equipped with a low water cut-off device. In the event of a leak in the system below the top of the boiler, you will lose your boiler if the fill valve is off and you have no low water cut-off.
    There is some debate about whether or not to close the valve even if a LWCO is installed. I tend to leave them on anyway, and we're required to install LWCO's in Maine, on any boiler.

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