| 摘要 |
<p>A safety device is provided for a header tank 3, the safety device having means for connecting the safety device to the header tank 3, the safety device being heat sensitive such that if water in the header tank 3 rises undesirably, the safety device acts to empty at least some of the water from the header tank 3 in a controlled and safe manner. In one embodiment, the safety device comprises a heat sensitive valve 2 and a drainage pipe 5. Usually a header tank will have means such as a ball-cock to supply fresh cold water to the header tank, when the level of water in the tank falls below a pre-determined level. Thus actuation of the safety device according to the invention will result in fresh cold water replacing heated water in the header tank resulting in a safe condition.</p> |
