Saw in a hardware store yesterday hoses for a washing machine that
apparently have an automatic shut off
valve incorporated into them to shut off the water if there is a downstream
hose leak or burst.
Was thinking bout this a bit, and am wondering how they do it.
I thought that it would be a simple slider type valve that looks at the
pressure differential on both sides, and moves to the shut-off position if
the downstream side pressure becomes very low, like for a burst hose.
But, it would also be very low, I guess, for a normal fill operation ?
So, how does it work ?
Then only ones I've actually seen were AC operated. The valve has a cord
which plugs into the power outlet and the washer plugs into an outlet on
the valve. When the washer is drawing current the valves open and when
the washer shuts off the valves close. But IIRC there are some that are
battery-powered have some sort of water sensor which sits on the floor
and shuts the valves if it detects a leak. I've got no idea which is better.
Don't know how they work but I have them and to keep them from
'tripping' I had to turn on the feed valves very slowly while the
washing machine was in the fill cycle.
I guess it has something to do with the speed at which the water is
The machine end of the hose has a restriction so water can only flow
very slowly. The supply end has a spring-loaded valve. Water flow
fights against the spring. If the flow is slow due to the restriction,
the spring wins and the washer fills. If the hose breaks, the
restriction is gone and water flows very very fast. This rush of water
overpowers the spring and the valve snaps shut. Obviously, this will
only work if your water supply has enough pressure and flow and if the
break in the hose is big enough.
I got mine to false when I first hooked it up because there was air in
the line and I turned on the supply too quick. Water rushed into
compress the air and slammed the safety valve shut. I had to release
the pressure at the washer end and try again, turning the supply on
On Feb 26, 7:21 am, email@example.com wrote:
Although burst hoses do happen, or so I have been told, I have never
seen nor heard of one from anyone I know. The floods I _have_
experienced have always been a fill valve failure, i.e., machine
doesn't shut off the water after it is full. That has happened to me
(twice) and my mother once in the past 30 years. Would those type of
hoses prevent that?
I don't know if you know me or not, but it happened to me. I was
lucky to hear the water noise in the pipes when I woke up, or I would
have gone to work and let it run all day.
I guess not leaving the machine alone long when running would prevent
that, but I certainly go upstairs. I usually come down within 10
minutes of when I think it is done, but the more I learn that it's not
going to mildew in my particular house, the longer I might wait for
that. That's bad.
I usually am there until the wash part fills, but that leaves two
rinse cycles that I'm not there for. It's just as likely it will
break one of those times.
I don't know how they work but Home Depot is getting a bunch of them
back. The appliance repairmen look at the hoses first thing if a
washer is not filling. It seems that locales with high water pressure
are the worst. High pressure on one side, fill valve opens, downstream
pressure drops and the hose shuts off.
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