초록 ▼

Method and apparatus for providing a controlled pressure liquid circulation system comprising a circulation conduit 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. The invention involves open

Method and apparatus for providing a controlled pressure liquid circulation system comprising a circulation conduit 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. The invention involves opening and closing said circulation conduit 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 at a substantially lower pressure, and is characterized by maintaining the circulation conduit open to a drain line 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 in the area thereof which is open to the drain.

대표청구항 ▼

A method for controlling the pressure of a liquid circulated by a pump means within a liquid circulation conduit which is adapted to receive additional pressurized supply liquid, as required, from a pressurized main supply liquid source and is adapted to discharge said circulated liquid to a drain l

A method for controlling the pressure of a liquid circulated by a pump means within a liquid circulation conduit which is adapted to receive additional pressurized supply liquid, as required, from a pressurized main supply liquid source and is adapted to discharge said circulated liquid to a drain line having a drain pressure equal to the pressure desired within the circulation conduit, which comprises maintaining said liquid circulation system filled with liquid and open to said drain conduit at all times, opening said pressurized supply liquid source to said liquid circulation system to supply additional liquid, as required, to said circulation conduit, the pressure of the liquid which is permitted to circulate through said circulation conduit being reduced by the discharge of liquid from said circulation conduit out said drain line, and closing said pressurized supply liquid source to said circulation conduit while maintaining said circulation conduit open to said drain line in order to maintain an equilibrium between the pressure of the liquid within said circulation conduit and the pressure of the liquid in said drain line.