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Need help with valve on hot water base board system
I have ahot water boiler system that has a valve with a thumb screw valve on the copper pipe just above the boiler (in a loop of one zone)
I have regular shut offs (with facet handles shutoffs) everywhare else.
But this one has be baffled, is there a way to shut this thumb valve down to do a circulator change out ?
Or is this thumb valve just a flow control to limit the amount of hot water that enters that particular section of the heater loop.
I can send pic if needed.
What I really need to do is close this valve so water does not return to boiler to do the switch of pump.
But it looks like it just regulates the amount of water flowing through the pipe.
If I can shut the valve , should I count the number of turns and return it to the same position when finished (thats was my thought),
Which direction shuts this type of valve off?
Its a thumb screw on a valve bass in line with the pipe (soldered in just like control valve) I think its a limiter valve ,
But need to know if I can shut it down by turning thumb screw?