| 摘要 |
<p>According to a method of preventing freezing in water piping there is arranged a non-return valve (3) upstream of the portion (1A) of the piping (1) which is to be protected, and a safety valve (4) downstream of this portion. The safety valve opens to allow the water to flow out and prevent freezing at a pressure increase of the water entrapped downstream of the non-return valve, the pressure increase occurring when the temperature falls from +4°C towards the freezing point. The invention also relates to a piping system for carrying out the method.</p> |
