| 摘要 |
<p>The invention relates to a liquid-circulation heating system and a pump wherein the supply and circulation of the heating liquid is controlled by means of a pressure difference created by thermostatic valves (6). The pressure difference directly controls a circulation pump (5) and a feed pump (4) which have different operating characteristics. Said pumps can be constructed together in such a way that they are located on the same axis or that they have a double-sided rotor wheel.</p> |
