Hi Folks,

I'm not sure if I have a pvc leak somewhere, or a well problem. The
symptoms are loss of pressure, heads that will pop up and down, then
spray, then lose pressure and pop up and down again...

This happens in 3 of the 6 zones. The other 3 zones run great.

In 2 of the zones we can hear a loud 'knocking' or 'surging' of water /
air when the pressure drops... You can even feel it "thumping" in
certain parts of the yard... we tried doing some random digging where
we heard the knocking and felt the 'thump thump thump' as the surge was
happening - found the pvc - but after about 6 feet in length of digging
1.5 feet down, (and finding no wet spots) we figured there HAS to be a
better way than just digging up the yard.

First - does this even sound like a leak? Could a leak in one zone be
affecting other zones? Why would the 'thumping' be louder when it gets
to zone 3 - as opposed to zones 1 and 2 (no thumping, but definitely
surging / changing pressure).

We haven't found any noticible 'wet spots' in the yard to indicate a
leak - even when we dug in the spots that had the most thumping, the
ground was dry..

Any ideas on how to easily find a leak? And again - does this even
sound like a pvc leak?

Thanks for any help.

sounds like a malfunctioning zone valve or the solenoid within one.


"shibumi" wrote in message
oups.com...
Hi Folks,

I'm not sure if I have a pvc leak somewhere, or a well problem. The
symptoms are loss of pressure, heads that will pop up and down, then
spray, then lose pressure and pop up and down again...

This happens in 3 of the 6 zones. The other 3 zones run great.

In 2 of the zones we can hear a loud 'knocking' or 'surging' of water /
air when the pressure drops... You can even feel it "thumping" in
certain parts of the yard... we tried doing some random digging where
we heard the knocking and felt the 'thump thump thump' as the surge was
happening - found the pvc - but after about 6 feet in length of digging
1.5 feet down, (and finding no wet spots) we figured there HAS to be a
better way than just digging up the yard.

First - does this even sound like a leak? Could a leak in one zone be
affecting other zones? Why would the 'thumping' be louder when it gets
to zone 3 - as opposed to zones 1 and 2 (no thumping, but definitely
surging / changing pressure).

We haven't found any noticible 'wet spots' in the yard to indicate a
leak - even when we dug in the spots that had the most thumping, the
ground was dry..

Any ideas on how to easily find a leak? And again - does this even
sound like a pvc leak?

Thanks for any help.

Is there any way to test the zone valves or solenoids - w/o having to
replace them?

"shibumi" wrote in message oups.com...
Hi Folks,

I'm not sure if I have a pvc leak somewhere, or a well problem. The
symptoms are loss of pressure, heads that will pop up and down, then
spray, then lose pressure and pop up and down again...

This happens in 3 of the 6 zones. The other 3 zones run great.

In 2 of the zones we can hear a loud 'knocking' or 'surging' of water /
air when the pressure drops... You can even feel it "thumping" in
certain parts of the yard... we tried doing some random digging where
we heard the knocking and felt the 'thump thump thump' as the surge was
happening - found the pvc - but after about 6 feet in length of digging
1.5 feet down, (and finding no wet spots) we figured there HAS to be a
better way than just digging up the yard.

First - does this even sound like a leak? Could a leak in one zone be
affecting other zones? Why would the 'thumping' be louder when it gets
to zone 3 - as opposed to zones 1 and 2 (no thumping, but definitely
surging / changing pressure).

We haven't found any noticible 'wet spots' in the yard to indicate a
leak - even when we dug in the spots that had the most thumping, the
ground was dry..

Any ideas on how to easily find a leak? And again - does this even
sound like a pvc leak?

If your water pressure is on the low side, it could be automatic drain valves, which
close under sufficient pressure, opening due to dropping pressure as the tank pressure
drops. Do you notice the symptoms coincide with the pump cycleing?

Bob

Nothing foolproof but I would start by activating them manually. Usually
there is a thumb screw or the solenoid unscrews partially then the water
flows without the controller activating the valve. Look for the word Open
and an arrow on the valve.

Put your hand on the valve, you should be able to feel and hear valve
chatter once you are that close.

Not sure what kind of defect to expect, something that causes oscillation of
the valve under certain pressure conditions. some debris caught in the
valve? Rubber parts are notorious for causing noises especially diaphrams
and valve seals

Any leaks after this valve would just appear like a sprinkler head to the
system, it would not cause thumping.

Also try adjusting the main supply valve, make sure it is all the way open.
It may also be a source of noise. Since you have the same thump on 3
branches of pipe, it may very well be this or something common to all 3


"shibumi" wrote in message
ps.com...
Is there any way to test the zone valves or solenoids - w/o having to
replace them?