초록 ▼

Leakage under pressure of fluid through the interface of a filter and a filter head or cover casting during removal of the filter is avoided by the use of a stepped gasket at the interface of the filter and the cover casting. The stepped gasket has both axially facing and radially facing sealing sur

Leakage under pressure of fluid through the interface of a filter and a filter head or cover casting during removal of the filter is avoided by the use of a stepped gasket at the interface of the filter and the cover casting. The stepped gasket has both axially facing and radially facing sealing surfaces with the latter serving to maintain a seal at the interface over an extended interval during the removal process, which interval is sufficient to enlarge the volume of the system to eliminate any pressure differential from the interior of the system to the ambient.

대표청구항 ▼

In a filter construction including a cannister containing a generally cylindrical filter element and having a face provided with a central internally threaded port for screw on attachment to a threaded male port on a cover casting, a second port radially outwardly of the internally threaded port and

In a filter construction including a cannister containing a generally cylindrical filter element and having a face provided with a central internally threaded port for screw on attachment to a threaded male port on a cover casting, a second port radially outwardly of the internally threaded port and alignable with an annular port in the cover casting, and an annular seal having an axially facing seal surface centered about said internally threaded port and located outwardly of said second port and engageable with an annular, axially facing seat surrounding said annular port, the improvement wherein said seal further includes a radially outwardly facing shoulder disposable within said annular port in sealing relation to the outermost side thereof.