View Full Version : Is it a Gas Valve or a Water Valve?

05-23-2011, 07:52 PM

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.


05-23-2011, 09:19 PM
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....


Tom Sawyer
05-24-2011, 03:30 AM
It will have WOG stamped on the valve. (water-oil-gas)

05-24-2011, 03:31 AM
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.

05-24-2011, 05:37 AM
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.

05-24-2011, 07:27 PM
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.

05-25-2011, 05:44 AM
Usually, just by looking at it. Gas valves have a distinctive appearance. The red handle just happens to be the color the manufacturer liked.

05-25-2011, 06:58 AM
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.