jdf405
Electrical Engineer
Hi all,
About 2 years ago I implemented a recirc system in my house that uses a small Taco pump and a third recirc leg. We're really happy with how it works for the most part. Check the schematic... I installed a pair of check valves on each of the "input" legs to the pump to prevent cold water from somehow sneaking back into the hot leg, and they do work.
My question is regarding types of check valve... At the time I just used some plain old swing checks that I got from a plumbing store. They are not sprung, but rather rely on reverse flow / pressure to shut the valve. Now, after a couple of years of use they make a loud bang when the hot tap is opened. The valve is slamming shut. Obviously they're supposed to be shutting, but I started to research and I'm finding that there are dozens of different kinds of check valves. Some advertise silent operation, some have springs, some have seals made of buna, HDPE, etc...
I'd like your thoughts / recommendations / advice on what to look for in replacements. They need to be rated for drinking water as it is conceivable someone will drink the hot tap. Obviously "quieter" operation is what I'm looking for here. Silence would be nice but I'll be reasonable. Also, since they are in the crawl space below the first floor, long life is desirable... I am not looking forward to servicing this!
Much appreciated!
Jonathan
About 2 years ago I implemented a recirc system in my house that uses a small Taco pump and a third recirc leg. We're really happy with how it works for the most part. Check the schematic... I installed a pair of check valves on each of the "input" legs to the pump to prevent cold water from somehow sneaking back into the hot leg, and they do work.
My question is regarding types of check valve... At the time I just used some plain old swing checks that I got from a plumbing store. They are not sprung, but rather rely on reverse flow / pressure to shut the valve. Now, after a couple of years of use they make a loud bang when the hot tap is opened. The valve is slamming shut. Obviously they're supposed to be shutting, but I started to research and I'm finding that there are dozens of different kinds of check valves. Some advertise silent operation, some have springs, some have seals made of buna, HDPE, etc...
I'd like your thoughts / recommendations / advice on what to look for in replacements. They need to be rated for drinking water as it is conceivable someone will drink the hot tap. Obviously "quieter" operation is what I'm looking for here. Silence would be nice but I'll be reasonable. Also, since they are in the crawl space below the first floor, long life is desirable... I am not looking forward to servicing this!
Much appreciated!
Jonathan