I have a Watts single handle washing machine valve that was installed
by a plumber less than 5 1/2 years ago, and I only did the laundry
once a week or sometimes not for 2 or 3 weeks. Tonight it developed
a leak when doing the laundry. The leak was at the stem (handle). I
went to Home Depot and bought a new Watts valve for $29 and just
replaced the whole thing (including the O rings) except that I reused
the old elbow attachments since those were soldered on.

The new valve appears to work fine, so far, and I am keeping fingers
crossed that it stays leak-free.

My question is this: When doing the laundry I would typically leave
the valve half-way (or less) between Off and On rather than all the
way On. When not doing the laundry the valve was off. Do you think
the new valve would be less likely to develop a leak if I turn it all
the way On rather than half-way-on (or less) on when doing the
laundry?

(I now have a pressure-reducing valve where the water comes into the
house, so maybe I don't need to bother with the midway position as a
means of reducing the water flow)

Thanks,

Jay

To be clear, the old valve still leaked tonight even when turning it
all the way on after it started leaking. It would only stop leaking
altogether when shut off. I'm just wondering if running it in the
midway position helped cause the leak and I'm better off leaving it
all the way on when doing the laundry.

Jay

On Jul 19, 10:36*pm, wrote:
To be clear, the old valve still leaked tonight even when turning it
all the way on after it started leaking. *It would only stop leaking
altogether when shut off. *I'm just wondering if running it in the
midway position helped cause the leak and I'm better off leaving it
all the way on when doing the laundry.

Jay

Putting the valve halfway on would reduce the flow, but not the
pressure when the washing machine was off. Now that yhou have a
pressure reducing valve at the house entrance, there is no reason not
to turn the water all the way on when using the washing machine. But,
after 52 x 5 uses, the valve should not have failed if the water was
totally "clean". Do you have some grit/sand in the water that would
have caused the smooth surface to become roughened?

Putting the valve halfway on would reduce the flow, but not the
pressure when the washing machine was off. *Now that yhou have a
pressure reducing valve at the house entrance, there is no reason not
to turn the water all the way on when using the washing machine. *But,
after *52 x 5 uses, the valve should not have failed if the water was
totally "clean". *Do you have some grit/sand in the water that would
have caused the smooth surface to become roughened?

I'm not aware of any sand or grit per se, but the water is hard,
meaning that it does have minerals in it. Would that alone cause it
to wear out with so few uses, or is it possible they just don't make
these things like they used to?

When I removed the old valve, I did notice that the elbow for the warm
water connection had more calcium, etc. on it than the cold
connection, but I don't know if that means anything. BTW, the water
heater is 4 years old and is a Bradford White.

On Thursday, July 19, 2012 8:25:51 PM UTC-7, (unknown) wrote:
I have a Watts single handle washing machine valve that was installed
by a plumber less than 5 1/2 years ago, and I only did the laundry
once a week or sometimes not for 2 or 3 weeks. Tonight it developed
a leak when doing the laundry. The leak was at the stem (handle). I
went to Home Depot and bought a new Watts valve for $29 and just
replaced the whole thing (including the O rings) except that I reused
the old elbow attachments since those were soldered on.

The new valve appears to work fine, so far, and I am keeping fingers
crossed that it stays leak-free.

My question is this: When doing the laundry I would typically leave
the valve half-way (or less) between Off and On rather than all the
way On. When not doing the laundry the valve was off. Do you think
the new valve would be less likely to develop a leak if I turn it all
the way On rather than half-way-on (or less) on when doing the
laundry?

(I now have a pressure-reducing valve where the water comes into the
house, so maybe I don't need to bother with the midway position as a
means of reducing the water flow)

Thanks,

Jay

Since you took out the old valve, do you see any cavitation in it? Cavitation occurs at or near the point where the flow is restricted when partially closing the valve. The water when restricted will spray at a very high pressure and erode the area which is restricting its flow. Reducing the water pressure to the entire house or opening the valve all the way will reduce this problem but that in turn can cause other problems like less water pressure at the shower heads.

Since you took out the old valve, do you see any cavitation in it? Cavitation occurs at or near the point where the flow is restricted when partially closing the valve. The water when restricted will spray at a very high pressure and erode the area which is restricting its flow. Reducing the water pressure to the entire house or opening the valve all the way will reduce this problem but that in turn can cause other problems like less water pressure at the shower heads

I can't see much into the old valve, just the ball itself and don't
see cavitation that I'm aware of. Presumably what wore out is the
Spindle O-Rings on the spindle that turns and I can't see inside, and
would have to remove the side plug to get to that (and I supposed it
woudn't be easy to get that removed even with the right size Allen
Wrench).

On Jul 20, 1:20*am, wrote:
Since you took out the old valve, do you see any cavitation in it? Cavitation occurs at or near the point where the flow is restricted when partially closing the valve. The water when restricted will spray at a very high pressure and erode the area which is restricting its flow. Reducing the water pressure to the entire house or opening the valve all the way will reduce this problem but that in turn can cause other problems like less water pressure at the shower heads

I can't see much into the old valve, just the ball itself and don't
see cavitation that I'm aware of. * Presumably what wore out is the
Spindle O-Rings on the spindle that turns and I can't see inside, and
would have to remove the side plug to get to that (and I supposed it
woudn't be easy to get that removed even with the right size Allen
Wrench).

I don't see what the point is of opening the valve half
way to reduce water flow is. For most of the water use,
the washer is going to fill up to the set fill level whether
it takes 3 mins or 30 mins. The only time a half open
valve would make a difference is during the beginning
of the rinse cycle, when it spins and sprays fresh water
before filling for the rinse cycle. That is to get rid of any
foam and displace the water in the clothes with clean
water. So, I'd want the water to be coming in fast,
not slow. It doesn't amount to much water, its only
a few intermittent sprays.

The only time I've fooled around with the valves was
years ago when I had washers that did not auto-adjust
the temperature. Then I would adjust the hot water side
to make the "warm" temp right. Also, the above applies
to most toploaders. Front loaders are a whole different
animal with no reason I can see to screw with the valves.

But does having the valve half open have anything to
do with the failure? Probably not.

I don't see what the point is of opening the valve half
way to reduce water flow is. * For most of the water use,
the washer is going to fill up to the set fill level whether
it takes 3 mins or 30 mins. * The only time a half open
valve would make a difference is during the beginning
of the rinse cycle, when it spins and sprays fresh water
before filling for the rinse cycle. *That is to get rid of any
foam and displace the water in the clothes with clean
water. * So, I'd want the water to be coming in fast,
not slow. *It doesn't amount to much water, its only
a few intermittent sprays.


Since the washer shuts the water off abruptly, having the valve open
half way means there is less of a shock to the pipes, etc., due to the
abrubt water shutoff. That is the only reason for the valve to be
opened less than all the way.

J.

On Jul 20, 10:54*am, wrote:
I don't see what the point is of opening the valve half
way to reduce water flow is. * For most of the water use,
the washer is going to fill up to the set fill level whether
it takes 3 mins or 30 mins. * The only time a half open
valve would make a difference is during the beginning
of the rinse cycle, when it spins and sprays fresh water
before filling for the rinse cycle. *That is to get rid of any
foam and displace the water in the clothes with clean
water. * So, I'd want the water to be coming in fast,
not slow. *It doesn't amount to much water, its only
a few intermittent sprays.

Since the washer shuts the water off abruptly, *having the valve open
half way means there is less of a shock to the pipes, etc., due to the
abrubt water shutoff. *That is the only reason for the valve to be
opened less than all the way.

J.

Does the water being shut off actually cause a
water hammer, ie the pipes banging around?
Or is this just a theoretical concern?
If it's the latter, I wouldn't worry about it. I've
heard a lot of people complain about water
hammer from a noise point, but can't recall
pipe failure being attributed to it. I guess it
could occur, if it's bad enough.

There are also devices you could have soldered
on near the valves that are essentially shock
absorbers for exactly that problem.

On Jul 20, 9:54*am, wrote:
I don't see what the point is of opening the valve half
way to reduce water flow is. * For most of the water use,
the washer is going to fill up to the set fill level whether
it takes 3 mins or 30 mins. * The only time a half open
valve would make a difference is during the beginning
of the rinse cycle, when it spins and sprays fresh water
before filling for the rinse cycle. *That is to get rid of any
foam and displace the water in the clothes with clean
water. * So, I'd want the water to be coming in fast,
not slow. *It doesn't amount to much water, its only
a few intermittent sprays.

Since the washer shuts the water off abruptly, *having the valve open
half way means there is less of a shock to the pipes, etc., due to the
abrubt water shutoff. *That is the only reason for the valve to be
opened less than all the way.

J.

The OP might have opened the valve halfway to reduce the water flow to
the washing machiine so that there would be more pressure and water
for toilet flushing, handwashing, etc!

Does the water being shut off actually cause a
water hammer, ie the pipes banging around?
Or is this just a theoretical concern?
If it's the latter, I wouldn't worry about it. *I've
heard a lot of people complain about water
hammer from a noise point, but can't recall
pipe failure being attributed to it. *I guess it
could occur, if it's bad enough.

There may not be water hammer, since I already have a pressure
reducing valve installed where the water comes into the house, but I
can sometimes see the hoses jiggle a bit when the washer shuts off
with the valve open all the way.

On Jul 20, 1:26*pm, wrote:
Does the water being shut off actually cause a
water hammer, ie the pipes banging around?
Or is this just a theoretical concern?
If it's the latter, I wouldn't worry about it. *I've
heard a lot of people complain about water
hammer from a noise point, but can't recall
pipe failure being attributed to it. *I guess it
could occur, if it's bad enough.

There may not be water hammer, since I already have a pressure
reducing valve installed where the water comes into the house, but I
can sometimes see the hoses jiggle a bit when the washer shuts off
with the valve open all the way.

Which I would say is normal and nothing to worry about.
But it's a minor point. The only negative I can see with
having the flow reduced is that you get less water during
the brief spraying before the rinse cycle and it takes
longer to do the wash.

On Jul 20, 10:54*am, wrote:
I don't see what the point is of opening the valve half
way to reduce water flow is. * For most of the water use,
the washer is going to fill up to the set fill level whether
it takes 3 mins or 30 mins. * The only time a half open
valve would make a difference is during the beginning
of the rinse cycle, when it spins and sprays fresh water
before filling for the rinse cycle. *That is to get rid of any
foam and displace the water in the clothes with clean
water. * So, I'd want the water to be coming in fast,
not slow. *It doesn't amount to much water, its only
a few intermittent sprays.

Since the washer shuts the water off abruptly, *having the valve open
half way means there is less of a shock to the pipes, etc., due to the
abrubt water shutoff. *That is the only reason for the valve to be
opened less than all the way.

J.

If you are _that_ concerned about "water hammer" from
the fast acting valves in the washing machine then install
the proper arrestors in the piping before the laundry valves,
do not try to use a shut off valve to act as an arrestor...

It sounds like that may be some of the reason why the
shut off valve seals failed after 5 and a half years...