Is there reason to spec one over the other instead of just life span? The city I am doing work for specs only brass metal seated, but the contractor says that he has never used anything but resilient wedge gate valves...and that they are "better"I have read up on them some, but dont really see a reason to choose one over the other... either have a better seal, or last longer... "Don't worry about the world coming to an end today. It's already tomorrow in Australia." Resilient-seated gate valves have been used for more than a quarter century. While there are perhaps many aspects to compare, I believe a few advantages of modern resilient-seated valves for example over iron-body bronze mounted (IBBM) gate valves are:1. Basically a clear and unobstructed waterway, that does not exhibit a bottom potentially debris-trapping "pocket" (like to receive the wedges that hit down in same and in various fashions spread e.g. IBBM disks).2. Demonstrations that at least some resilient-seated gate valve designs will effectively seal (and even bottle-tight) against at least some significant foreign objects like rocks and steel nails (that will generally thwart metal seals when trapped in the seat area).3. At least some resilient-seated gate valve designs employ quite strong principal parts of ductile iron only, whereas IBBM gate valves per some standards/designs still can contain weaker gray cast iron.While I believe "better" is something that should ultimately be defined by the users (including I would think Contractors, as it appears is one party you're already conversing with, who sometimes are asked to even test against such valves), I believe there has been a dramatic relative increase in demand over many years for resilient-seated as opposed to IBBM valves, and particularly in common municipal fields.

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