Pump for periodic conveyance of the cooled-down water content of a hot water distribution line
OwnerKarsten Andreas Lainginventor
Life of this patent
Estimating the term…
Abstract
A hot water distribution system incorporating a pump positioned close to, and between each set of hot and cold water taps to which periodically move the cooled-down water content of the hot water distribution line through the cold water distribution line back to the hot water tank until the total content of the hot water line has a predetermined temperature. The pump is provided with a valve responsive to pump-generated pressure to prevent backflow when the pump is not in use and the pressure in the cold water distribution line is lower than the pressure in the hot water distribution line, such as when water is drawn through a cold water tap.
Claims12
A pump which comprises:
- a suction region, a pressure region, and an impeller for moving a liquid from said suction region to said pressure region;
- an inlet port leading to said suction region an outlet port leading from said pressure region a back flow inhibiting first valve located between said pressure region and said outlet port;
- a differential pressure-controlled second valve located within said pressure region;
- said second valve including an opening control mechanism responsive to the pressure of the inlet port exceeding the pressure of the outlet port.
In a centrifugal pump, where a rotating impeller is driven to cause a fluid to flow from an inlet region to an outlet region, an improvement for preventing backflow through said pump when the impeller is not driven, said improvement comprising valve means between said impeller and said outlet region, said valve means being positioned and oriented to only open in response to fluid pressure generated when said impeller is driven;
- wherein said valve means comprise:
- a chamber having a translatable wall section, and an escape aperture into said outlet region, said aperture being surrounded by a valve seat;
- said translatable wall section having a first portion shaped and dimensioned to close said aperture in a first position and to allow flow of fluid through said aperture in a second position;
- means for resiliently biasing said first portion toward said first position;
- and
- said translatable wall section further having a second portion shaped and positioned to avoid contact with said valve seat and aperture in either one of said first and second positions.
Dependencies are inferred from the claim text.