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Posted by bent on February 18, 2007, 2:42 pm
Actually the 2 lines that need fixing are attached to a sink and a toilet
and are in competition with one other sink nearby on the same basement level
for the lowest in the gravity table. Of the two sinks I think the one that
leaks permanently is the one I have to fix - I mean its the one that drips
when both are open. Just my luck. SO, am I right in assuming I cannot fix
this without curing my main water shut-off problem?! Somewhere else and I
guess you may be right.
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Posted by bent on February 18, 2007, 3:52 pm
The thing I may have painted over is a knurled head 9/16" H x 11/16" Dia on
a post sticking out 1" complete that is molded into the steel valve
bulb-shaped housing at right angles to the main shut-off stem and is inline
with the center of the housing located at a point just higher than center
(higher than the main shut-off stem). There seems to be a hole in it (or a
point that looks like where a rollled steel cotter pin is put), and the
knurled head suggests it can be adjusted. Its centered after the shut off,
barely. What is this thing?
I'm trying to put this post at the end, for everyone to see.
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Posted by Bill on February 20, 2007, 11:47 am
"Weird" valve things you may see near a water meter are backflow prevention
devices. And sometimes connections to test these devices.
What can happen is that you are watering a tree with a garden hose and have
just sprayed the tree with insecticide. And there is a puddle of water the
hose end is laying in.
Then the city water is shut off maybe because of the main breaking or
whatever. And you are located up on a hill. Someone down the street is also
watering. Well in the absence of pressure in the main, water flows downhill
to where someone downhill is watering.
Water is sucked "backwards" through your hose and into the city water main!
Also the insecticide is also sucked into the city water main!
To prevent this from happening, many cities require backflow prevention
devices near the meter. This can be what is called a "gate valve". Sometimes
there are connections on either side of the valve for testing. Someone can
connect a testing device to these to test the valve to be sure water will
not flow backwards.
Also you will see toilet and garden sprinkler valves which say
"anti-siphon". Some are also "vacuum breaker". This lets air in to break a
siphon. If you paint over the air hole, it may not function properly.
Diagram of an anti-siphon vacuum breaker valve...
http://www.dwbp-online.com/avb_flow.htm
Anti-siphon...
http://home.howstuffworks.com/question166.htm
Backflow testing...
http://www.atlanticbackflow.com
http://www.advancedinc.com/backflowtest.html
http://backflowtestkits.com/gauges.html
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