Patent ID: 8057687

Claim:
Liquid filter heat exchanger unit comprising: a heat exchanger including an inlet through which a liquid is supplied to the heat exchanger and an outlet through which the liquid exits from the heat exchanger after having passed through the heat exchanger a liquid filter comprising a filter housing comprising an inlet passage receiving liquid to be filtered; an outlet passage for filtered liquid; a drainage passage for draining liquid from the filter housing for service the filter element; a receiving chamber; and a filter element exchangeably arranged in the receiving chamber, wherein the liquid is supplied through the outlet of the heat exchanger to the receiving chamber at an unfiltered side of the filter element; a bypass in the filter housing that fluidically connects the inlet passage to the receiving chamber in the filter housing; a switching member including an outer wall surface of said filter element closing over said bypass, said outer wall surface operable to close said bypass upon installation of said filter element into said filter housing, said outer wall surface operable to open said bypass upon removal of said filter element from said filter housing; a closure spring arranged in said filter housing, said closure spring contacting and loaded by said filter element, wherein interaction of said closure spring with said filter element is operable to open said drainage passage to drain liquid from said receiving chamber upon removal of said filter element from said filter housing, wherein interaction of said closure spring with said filter element is operable to close said drainage passage upon installation of said filter element into said filter housing.