I have seen previous threads about these valves, none good. I think you are looking at replacing the valve with a more conventional unit, sorry for the bad news.
Please do a search on the valves to get some more info, and then if you are not comfortable with cutting and gluing in a new valve, contact a plumber.
I have these in my house and am not looking forward to the future replacement.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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