Evil Compression Valves

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  #1  
Old 03-11-19, 08:39 PM
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Location: USA
Posts: 126
Evil Compression Valves

How can you not like compression valves? You've got a stem, seat, and a flat or
beveled rubber washer. It's so simple. Nothing can ever go wrong.

My house has three bathrooms. One has a shower only, no tub. The showerhead
was dripping. I cleaned and lubricated the stems. Replaced the washers and seats.
The dripping did not stop.

I've repaired a zillion compression valves. Why the dripping did not stop is a complete
mystery to me. Replaced the seats and washers again. The dripping continued.

I told my family these valves are "evil" because if you use the shower, close the valves
and wait ten or fifteen minutes the dripping stops!

Can someone explain why the dripping continues, after replacing the seats and washers
twice?
 
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  #2  
Old 03-12-19, 04:21 AM
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Your post needs clarification. Is the drip continuous or 15 minutes? Is the drip the same if you only use the cold or hot valve? A 15 minute drip is the result of gravity and the fact the plumbing to the shower head is an inverted U.After the shower valves are turned off, the water in the U plumbing to the shower head is held up by atmospheric pressure. Gravity will eventually cause a drip to fall from the shower head. Eventually the drips result in a void at the top of the U plumbing. The void, being at less than atmospheric pressure, will allow air bubbles to pass from the shower head to the void. When the void is at atmospheric pressure, the remaining water in the U plumbing, going to the shower head, will discharge rapidly and the drip will stop.
 
  #3  
Old 03-12-19, 09:07 PM
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Yes, I understand there is a standing column of water when the valves are closed.
Some dripping is normal in most cases.

I've serviced these shower valves many times. They never dripped. Not even one
drop after the valves were closed. I'm replacing the washers and seats in both
valves, so it didn't seem to matter if the hot, cold, or both valves were dripping.

What's happening now is almost incomprehensible. If a family member uses the
shower, the head drips for ten to fifteen minutes after valves are closed and then
it sort of stops. Let me explain. Several hours after the dripping stops it starts
again! It doesn't stop until a family member uses the shower again.

I have few dozen spare tiles for this bathroom. If necessary, I'll cut a big hole in
the wall and replace the manifold.
 
  #4  
Old 03-14-19, 06:39 AM
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Join Date: Oct 2015
Location: Ct.,USA
Posts: 857
How are the replacement seats water sealed in the faucet body?
 
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