The valve seats are metal. The rubber washers need to be replaced
periodically. no big deal, unless you can't get the top off the
valve. When you reassemble, neverseeze on the threads is always a good
idea. otherwise, use plumber's grease. Use plumber's grease on the
stem threads to prolong the life of the valve.
Some valve seats are replaceable (if the valve is old)
I had one new chinee 1/2" solder valve that had a porous body casting.
It was ok when installed, then started to leak. The calcium in the
water would often plug up poor solder joints, so I thought eventually
this valve would plug up. It never leaked much, just enough to be
annoying and mark the floor. A rag wrapped around it would prevent
drips. I finally replaced the valve to sell the house.
Curt Raymond via Mercedes wrote on 10/8/19 10:38 AM:
I've been having this problem with the gate valves in my house. All the
plumbing is probably 40 years old and the rubber seats have worn out so they
won't seal. I've been slowly working my way around replacing them.
Replacements are cheap but like you I've found them to be dubious quality. Some
I can't get the assembly apart to solder them in place. My hardware store folks
told me to just leave them together which I have done and its been okay but I'm
never happy about it.
A Google search suggests made in USA valves might be available but at
tremendous cost...
-Curt
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