What causes water leak with no pressure?
What causes water leak with no pressure?
(OP)
We have a cartridge water filter that's been giving us a bit of a problem lately. The body (looks like a tall pitcher complete with handle) screws onto a top cover and seals with an O-Ring sandwiched between the two. It looks like it's leaking out of the O-ring and the strange thing is that it only leaks when we turn off the pump. The rate can be as small as one drop every ten seconds or a steady stream of water. The O-ring looks good with no cracks but we'll probably replace it anyway.
What could cause this?
What could cause this?





RE: What causes water leak with no pressure?
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RE: What causes water leak with no pressure?
I get the feeling that there's some strange back pressure or something going on when you shut off the pump. I don't claim to know the answer, but I can still see that it might leak in the opposite fashion from what you'd expect.
RE: What causes water leak with no pressure?
RE: What causes water leak with no pressure?
If it truly is a case or pressure / no pressure then something is being shoved into the leak when the system is under pressure. When the system is not pressurized (or the pressure is reduced) then whatever is plugging the hole is allowed to relax and move out of (or away from) the hole.
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
RE: What causes water leak with no pressure?
Don't be too frugal with plumbing. Replace whatever is necessary to keep system integrity, for sake of health and property.
RE: What causes water leak with no pressure?
O-rings are hydraulic seals and rely on pressure to energise them.
The variable leak rate would indicate that the o-ring is moving when the pump is switched off.
Do not assume that the O-ring is the correct size. Measure the groove and get a suitable replacement.
Hydromech...
RE: What causes water leak with no pressure?
We put a pressure guage and a strip chart on the inlet and didn't see any pressure spikes. Also, when we turn off the pump the pressure is low enough that it doesn't register on the guage. Of course the guage range is pretty high, over 100 psi, so the low end isn't going to register well.
The filter had been running fine for a while and suddenly started leaking. We hardly ever open it up.
Last night we replaced the top cover and the O-ring. We'll see if that helps.
RE: What causes water leak with no pressure?
(Just a thought....)
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RE: What causes water leak with no pressure?
Cheers
Greg Locock
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RE: What causes water leak with no pressure?
RE: What causes water leak with no pressure?