jedjoe
Silver Member
I got these check valves from Amazon. Here is the link to the correct product.
There are metal valves that would probably be more durable, but I went with these for two reasons: 1) It was an experiment that I didn't know would work and thus didn't want to waste money if ineffective; 2) these were the only valves where I could clearly determine a small opening pressure. I didn't want a valve that would require too much pressure to open. These valves have a documented opening pressure of 0.5 kpa or 0.07 psi. There were some nice aluminum alloy valves, but their opening pressure was 2.9 psi (or 20 kpa) and I was afraid that would be too high a pressure to operate on these low pressure return lines.
There are metal valves that would probably be more durable, but I went with these for two reasons: 1) It was an experiment that I didn't know would work and thus didn't want to waste money if ineffective; 2) these were the only valves where I could clearly determine a small opening pressure. I didn't want a valve that would require too much pressure to open. These valves have a documented opening pressure of 0.5 kpa or 0.07 psi. There were some nice aluminum alloy valves, but their opening pressure was 2.9 psi (or 20 kpa) and I was afraid that would be too high a pressure to operate on these low pressure return lines.
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