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If you decide to shop around for deals on ebay or elsewhere, here's the Cv/turns chart for the PMV valve from Generant and any valve with flow characteristics similar to this should work well for the gas flow in a 1 lb fluidbed according to the experts I spoke with. Something to avoid in any valve is abrupt zig zags or spikes in the Cv chart line in the preferred area of the curve. Some valves go along fine up through 3 or 4 turns and then the line shoots almost vertical for a bit before resuming a reasonable curve.