Is it a Gas Valve or a Water Valve?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by molo, May 23, 2011.

  1. molo

    molo New Member

    Messages:
    840
    Location:
    cold new york
    Hi,

    I was told by a natural gas company service person that a ball valve (shut-off) in a 1/2 inch gas line was for water and not gas.

    How can he tell the difference? This is an older valve with no labels. Many ball valve shut-offs are for water and natural gas.

    Thanks,
    Bill
  2. SacCity

    SacCity In the Trades

    Messages:
    189
    Location:
    Sacramento, CA
    What color is the handle?
    I bought a bunch of valves today,
    THe gas valves had yellow handles on them.
    On the side in the casting it had "1/2 psi"

    Not sure what the other colors are off hand, Red & Green....

    Michael
  3. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,078
    Location:
    Maine
    It will have WOG stamped on the valve. (water-oil-gas)
  4. wallskev

    wallskev New Member

    Messages:
    72
    Location:
    North Carolina,USA
    Handle Color not the Clue !

    I would not go by the color of the Handle. I have many yellow handled Water ball valves and even a Blue Handle Gas valve.


    Most have a rating stamped on them. You will see WOG on the side. This stands for Water, Oil or Gas. Most gas valves are brass and much heavier than standard valves. The difference is in the internal sealing of the ball. Gas valves are better.

    Most of the ones I could check have WOG on them. I have 1 with just a G on it . Also don't go by the Handle type either as I have a gas Ball valve with a long handle (Red).


    Possibly there is some other evidence that will help. The 1/2 psi indication , if there is no G would make me think it is for water but I am not a valve manufacturer.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,315
    Location:
    Cave Creek, Arizona
    The color of the handle usually identifies the manufacturer, NOT the valve's usage. Valves with WOG on them are for liquid gas, unless they also have the AGA tag. Technically, they are NOT natural gas valves but do function for that purpose. AGA certified valves are usually less expensive, however.
  6. molo

    molo New Member

    Messages:
    840
    Location:
    cold new york
    The ball-valve had a red handle and no markings. I do not know how the gas company determined it was a water valve and not a gas valve.
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,315
    Location:
    Cave Creek, Arizona
    Usually, just by looking at it. Gas valves have a distinctive appearance. The red handle just happens to be the color the manufacturer liked.
  8. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    I don't know if we have a definitive answer here yet. I always thought that to be used for gas, the valve had to be AGA listed.
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