My house has 12 radiators, and I recently had thermostatic valves fitted to 10, and new valves throughout.
Since then, when the system gets up to temperature, I get an effect like water hammer from 2 bedroom rads. When you investigate, the vibration is in the thermostatic valves. Frequency is about 5 beats per second, so not as violent as water hammer.
The thermostatic valves are set to 4 (scale of 1-5). If I make a slight adjustment either side of the the currnet rad setting, that seems to close or open the valve sufficient to stop the noise. But it sometimes comes back later.
I have spent a lot of time bleeding air from the system, and don't think there is any significant amount of air left.
Does anyone know why this happens and how I can overcome it please?
(I have a conventional boiler & pump system for heating & hot water. System is over 30 years old; Boiler replaced about 8 years ago; Potterton Profile 60 boiler. System has been flushed by plumber.)
Since then, when the system gets up to temperature, I get an effect like water hammer from 2 bedroom rads. When you investigate, the vibration is in the thermostatic valves. Frequency is about 5 beats per second, so not as violent as water hammer.
The thermostatic valves are set to 4 (scale of 1-5). If I make a slight adjustment either side of the the currnet rad setting, that seems to close or open the valve sufficient to stop the noise. But it sometimes comes back later.
I have spent a lot of time bleeding air from the system, and don't think there is any significant amount of air left.
Does anyone know why this happens and how I can overcome it please?
(I have a conventional boiler & pump system for heating & hot water. System is over 30 years old; Boiler replaced about 8 years ago; Potterton Profile 60 boiler. System has been flushed by plumber.)