I
Iveagh
Hi All
Im a good DIYer not a plumber. Im workng on a closed heating system. Im replacing all valves on Rads. New Pegler lockshield valves and Drayton TRV4. To scope it out tonght tonight I started on the downstairs hall rad to see how this would work. I closed off both existing rad valves completely. I opened the connection to the rad on the manual control valve side to drain the rad, all went well.
I offered up then TRV by loosely connecting it, being new to this process to see all fitted and lined up, all fine. I went to the boiler and I was surprised to find the pressure was zero. I say surprised as both rad valves were full closed off and one side the lockshield only connected still to the rad so I assumed it was a closed system at this point. I opened the penny valve on the filling loop and the pressure increased to 1 bar quickly.
I went back to the rad. The side not connected was leaking water meaning water must have come in under pressure from through the lockshield valve, the pressure at boiler dropped.
Question, Is the assumption above correct, and is it normal for these to 'back leak' under normal operating pressure.
I ask this as it would mean I need to be cautious into the future in going away and leaving any rad half re assembled and assuming because the valves are closed there wont be leaks.
I have reassembled the rad with the old valves for now, refilled at loop and pressure seems to be holding.
Thanks
Iveagh
Im a good DIYer not a plumber. Im workng on a closed heating system. Im replacing all valves on Rads. New Pegler lockshield valves and Drayton TRV4. To scope it out tonght tonight I started on the downstairs hall rad to see how this would work. I closed off both existing rad valves completely. I opened the connection to the rad on the manual control valve side to drain the rad, all went well.
I offered up then TRV by loosely connecting it, being new to this process to see all fitted and lined up, all fine. I went to the boiler and I was surprised to find the pressure was zero. I say surprised as both rad valves were full closed off and one side the lockshield only connected still to the rad so I assumed it was a closed system at this point. I opened the penny valve on the filling loop and the pressure increased to 1 bar quickly.
I went back to the rad. The side not connected was leaking water meaning water must have come in under pressure from through the lockshield valve, the pressure at boiler dropped.
Question, Is the assumption above correct, and is it normal for these to 'back leak' under normal operating pressure.
I ask this as it would mean I need to be cautious into the future in going away and leaving any rad half re assembled and assuming because the valves are closed there wont be leaks.
I have reassembled the rad with the old valves for now, refilled at loop and pressure seems to be holding.
Thanks
Iveagh
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