| 摘要 |
<p>Method and apparatus for providing a controlled pressure liquid circulation system comprising a circulation conduit (10) through which a liquid can be circulated and recirculated to accomplish a desired function, such as heating and/or cooling of a work station such as a mold (13). The invention involves opening and closing said circulation conduit (10) to a source of supply liquid, such as city water, at elevated pressure while maintaining the controlled pressure of the liquid within said circulation conduit (10) at a substantially lower pressure, and is characterized by maintaining the circulation conduit open to a drain line (17) at all times and providing or maintaining a drain pressure which is at least slightly above atmospheric and is equal to the pressure desired within the circulation conduit (10) in the area thereof which is open to the drain.</p> |
