My Taco 219 Flo-Chek to prevent gravity flow is stuck in the closed position when the zone is calling for heat so I am not getting any heat in the rooms serviced by that zone. How can get it unstuck? the chrome splined thumb screw on the top can be backed out. I believe this is intended to allow for gravity feed if power goes out and the circulator won't operate. Am I right? How far can I back out that thumbscrew? Will I get a leak if I back it out all the way? Can it be removed and cleaned to allow it to move freely? Do I need to drain that zone in order to work on the Flo-Chek?
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