| 摘要 |
<p>The radiator system feed and return flow conduits issue freely below the surface of the water volume in the heating boiler, and water circulation is maintained under the effect of a circulation pump or of its own pressure. The weight of the water contained in the radiator system is so balanced by vacuum effect occurring in the radiator system that the water, despite open connection of input and output pipes, is prevented from running out into the lower water volume. The radiator system water volume above that below it in the boiler can be wholly or partially cut off from the lower water volume by valve devices. It can be topped up via a branch pipe with water from that under excess pressure in the supply mains. The radiators in the system each have air bubble 'bleed' valves, and the heating boiler, accumulator tank, etc. are provided with adjacently connected expansion vessels which with the outlet pipes are in free connection with atmospheric air. Where a leak occurs in the system, the water is sucked inwards through the ruling vacuum effect and runs downwards through the input and output pipes to the outlet of the expansion vessel.</p> |
