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I do not know what type of valves these are - they are located on both sides of the circulating pump. The valves have a screwdriver slot to open or close the valve - this is where the leak is. As a temporary fix, could I wrap the valves in PTFE to stop the leak when I repressurise the system?

I have a leak coming from the screw on the isolating valves on either side of the circulating pump. The pressure has gone to zero - I have tried repressurising the system using the filling loop, but more water comes out of the valves screws (the screw that opens and closes the valve). What could...