WATER TANK DRAIN VALVE - CONTENTS: Water tank drain valve information: where do we find the water pressure tank drain valve on a private well, tank, and pump system, how is it used, how to repair leaky valves
What are the controls, switches, valves found on water tanks and water pumps, what do they do, how are they repaired?
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Water storage tank drain valves:
where do we find the water pressure tank drain valve on a private well, tank, and pump system, how is the water tank drain valve used during water tank service or repair, and how we replace or repair leaky drain valves.
How to get water out of a water pressure tank or water storage tank.
WATER TANK DRAIN VALVE Guidelines, Usage, Location, Repairs
In the page top photo you can see a round black handled drain valve in the center of the picture, just
below the pressure gauge. This valve is used to completely drain the water tank (and possibly
the entire water piping system too).
Usually the water tank drain is connected to a hose which is run outside
of the building or to a nearby floor drain.
[Click to enlarge any image]
This water tank drain is not normally opened when the pump is
turned on since you'll simply run the pump and flood the building, but we have used it as a convenient
way to connect a water hose to the system.
We once put out a small fire in this manner.
In an emergency if your building has lost water pressure but a neighbor's water system is working, you can "back feed" your building's water piping by connecting a garden hose from your neighbor's outside water faucet to this water tank drain.
You'll need a double-female-ended washing machine hose to complete the connection. Of course you could back-feed from a neighbor to any easily accessible hose connection on your building such as an outside water spigot or a washing machine cold water hookup as well.
Water tank drains should be piped to a visible location: not installed with a drain
to a crawl space as this owner did. For convenience, the owner wanted to be able to
drain the water system to avoid freezing when this home in Rhinebeck New York was unoccupied.
But first of all, sending water into the crawl space risks mold, rot, and insect damage
to the building, and second, it's generally a bad idea to send any drain, overflow,
or relief valve to a hidden location. If the piping is leaking we want to know it.
If the water tank drain is leaking it needs to be repaired (usually a simple internal
washer) or replaced.
But you can defer this repair by screwing a garden hose cap onto the
gauge threaded outlet. We put these caps on all of our tank drains in areas where children
are playing since on occasion they've been opened by curious kids.
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