Patent ID: 9233745
Filing Date: 2016-01-12
CPC Classification: B63H,F16J,Y10T

Claim Text:
1. A seal apparatus for sealing around a rotating shaft of a watercraft where said shaft penetrates from an interior side to an exterior side of a hull of said watercraft, comprising: a housing around said shaft; plural seal rings around said shaft, forming at least one seal chamber axially between successive ones of said seal rings; and plural medium lines communicating with said at least one seal chamber, and including at least one medium supply line to supply a respective fluid medium to said at least one seal chamber and at least one medium return line to remove said respective fluid medium from said at least one seal chamber; wherein a first portion of a first one of said medium lines is arranged and extends longitudinally within a first portion of a second one of said medium lines, wherein said first portion of said second medium line comprises a passage extending through said housing, wherein said first portion of said first medium line comprises a pipe arranged and extending within said passage, and wherein said pipe has an outer diameter smaller than an inner diameter of said passage.