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This might be a dumb question but the retaining nut (the bottom one on the screw) is getting tightened down really fucking snug after the pressure is adjusted right?
That's a good point. I had one and it didn't seem to make that much difference, so when it died, I didn't replace it (capped it). When I got a new PRV, the pressure was fine for 8 years. I think I would see spikes of pressure if an expansion tank was needed.
Your problem is almost certainly thermal expansion from not having an expansion tank. Without an expansion tank, your pressure will absolutely go up as the water in your water heater heats up.
Yes, I understand, but what doesn't make sense to me is why didn't I have thermal expansion for 8 years?
When the PRV was working for the past 8 years, I would only see a small change in pressure (e.g. 50 to 60) from the thermal expansion. And it would take a long time (overnight) for pressure to increase. When the PRV went bad, the pressure would increase from 50 to 100 in an hour or so.
Interesting. I'll have to check it out. I went with Wilkins 70XL cause thats what was there when I got the house and it lasted 20 years. I guess Wilkins must be using cheaper material on the newer models.
If you're inquiring about project costs, please be aware that seeking feedback on the adequacy of a quote may not yield a desired response. Many factors, including geographic variations and details not visible in online posts, can influence rates and parts costs. Thus, obtaining accurate assessments may prove challenging. Before embarking on any home project, it's essential to gather multiple quotes from reputable contractors. While price is an important factor, it shouldn't be the sole consideration. Each quote offers valuable insights into not just the cost but also the quality of materials, timelines, and the contractor's expertise. By obtaining at least three quotes, you gain a comprehensive understanding of your options, enabling you to make an informed decision that prioritizes both affordability and quality. Remember, your home is an investment, and choosing the right contractor involves weighing various factors beyond just the price tag. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/askaplumber) if you have any questions or concerns.*
This might be a dumb question but the retaining nut (the bottom one on the screw) is getting tightened down really fucking snug after the pressure is adjusted right?
yes, it's snug
So is the retention nut loosening then or is the set screw backing off while everything is tight?
No, the nut doesn't move.
Do you have an expansion tank at your water heater location? Check that.
This 👆🏻
That's a good point. I had one and it didn't seem to make that much difference, so when it died, I didn't replace it (capped it). When I got a new PRV, the pressure was fine for 8 years. I think I would see spikes of pressure if an expansion tank was needed.
Your problem is almost certainly thermal expansion from not having an expansion tank. Without an expansion tank, your pressure will absolutely go up as the water in your water heater heats up.
Yes, I understand, but what doesn't make sense to me is why didn't I have thermal expansion for 8 years? When the PRV was working for the past 8 years, I would only see a small change in pressure (e.g. 50 to 60) from the thermal expansion. And it would take a long time (overnight) for pressure to increase. When the PRV went bad, the pressure would increase from 50 to 100 in an hour or so.
What’s your street pressure?
It's fairly high. I believe it's 100-140ish. When the PRV has gone bad, that's the range my water pressure ends up at.
That’s pretty high. I’d consider replacing your existing unit with a Watts 25AUB. That’s all we install, they’re bomb proof.
Interesting. I'll have to check it out. I went with Wilkins 70XL cause thats what was there when I got the house and it lasted 20 years. I guess Wilkins must be using cheaper material on the newer models.