Thanks CB80 and I.B.,
I.B., What was your application when the 474P failed?
I had a 414P on my weep system. It failed closed (Caused a freeze up) and I replaced it with an Asco Diaphragm type valve. The Asco has been flawless. I opened the 414P and found a lot of Calcium/Lime buildup. I have no idea how long it was in service....
I'm trying to decide which valve would be the best for direct/regulated city pressure to my pumps. I know Randy uses the 414P and doesn't have any problems. I'm trying to make the most educated decision based on the specs/service life of the valves. Dema does not list service life on their valves. Asco's diaphragm valves have a 10,000,000 service life for comparison. I may like the idea of a slower acting valve to minimize water hammer, but could there be vacuum issues with the valve when the pump kicks on at the same time? Could this cause a diaphragm valve to fail closed? I don't have to worry about chemical degradation since its a water only application. Thanks!