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Rad valve--open vs partially closed?

btc
btc Member Posts: 43
I have one radiator (furthest from boiler) that accumulates water [and subsequently bangs once heat gets 1/2 way across). Pitch is okay so suspected valve opening. Took valve apart--when fully "open" the gasket still blocks 1/2 of the opening into the rad. This is original equipment (Detroit valve) on one-pipe steam so it is a little perplexing-it seems to be designed to only leave 1/2 open into radiator....Riser to valve is 3/4", Valve is 1", iron radiator EDR is about 25 (11 sections, 3 column, 18" high.) Hoffman 40 vent. Boiler pressure low, believe steam relatively clean. Any ideas appreciated.

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