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Adsco vents

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I live in a 1918 Dutch Colonial house with a two-pipe steam system. I am having trouble balancing my system due to inoperable steam valves.  They are Adsco brand 90 degree valves with a wood turned handle on the top.  They are attached to 3/4" pipe.  What are some suitable replacements for these vents so I can replace them and hopefully balance my heating?  Also, is there any reasonable method for zoning steam heat? 
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