My 4 rads downstairs TRV's all make an annoying hissing sound after an hour
or so, i know the valves are OK because i have swapped them round with the
if i adjust the temp on them this seems to make the noise go away (for a
while anyway then i change the temp again)
The TRV must be installed so that the water flow is in the proper direction
the valve. The valve body has an arrow cast into it to indicate proper
If all the downstairs valves are installed properly, I would look for the source
the noise in the velocity of water through the valves. Maybe the pump is too
maybe there is no bypass for flow when all the TRV's are shut. These kinds of
things will make valves sing.
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