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beocop

New Member

Posts: 3

Location: USA

1

Tuesday, June 28th 2005, 6:13am

PVB problem.

After a zone has completed its cycle. The PVB starts to gurgle and spew water from the bonnet in a cyclic manner. It does not reseal and repressurize. Also, the supply pipe is banging/thumping. What's the cause of the problem. Does it have to do with the PVB height with respect to the sprinkler head height (might not be 6"+ above heads)?

Please help.

Wet_Boots

Supreme Member

Posts: 4,027

Location: Metro NYC

2

Tuesday, June 28th 2005, 9:16am

Is it really a PVB? Sounds more like an AVB. There is a world of difference between the two. A PVB can leak when its pressure drops way down, when cycling from zone to zone, while the first valve may be open for a time. Maybe the controller has a delay between zones that could be employed.

By the way, you must have at least a twelve inch elevation difference between the PVB and any pipe or sprinkler it feeds, in order for the device to have any useful protective function.

RidgeRun05

Supreme Member

Posts: 314

Location: USA

3

Tuesday, June 28th 2005, 12:25pm

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Wet_Boots</i>
<br />Is it really a PVB? Sounds more like an AVB. There is a world of difference between the two. A PVB can leak when its pressure drops way down, when cycling from zone to zone, while the first valve may be open for a time. Maybe the controller has a delay between zones that could be employed.

By the way, you must have at least a twelve inch elevation difference between the PVB and any pipe or sprinkler it feeds, in order for the device to have any useful protective function.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

I agree here. If you are truly running a PVB, then the installation height of the PVB is not only not to plumbing code, it, like Wetboots said, will not function properly. What size supply line do you have? and has it been doing this since you had the system?
Tony Posey
Ridge Run Landscapes

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