Sealing system and method of determining seal integrity

Details Sealing system and method of determining seal integrity Sealing system and method of determining seal integrity

F - Mech Eng,Light,Heat,Weapons

16

J

F16J 15/02 (2006.01) F16J 12/00 (2006.01) F17C 13/02 (2006.01)

Patent

CA 2504495

A sealing system for a high pressure fuel cylinder has an inner seal and an outer seal sealing an insert into a boss of the cylinder. Permeation rates as a result of the differential pressures across the seals are balanced across both the inner and outer seals to maintain a constant pressure in an intermediate space between the seals. Permeation is balanced by selecting suitable seal materials or by seal geometry or by providing a pressure relief device to the intermediate space to release excess pressure built up in the intermediate space beyond a desired intermediate pressure. Maintaining the intermediate pressure lower than the cylinder pressure and higher than atmospheric pressure results in lower pressure differentials across the seals, extending the seal life. A pressure switch or gauge is provided to monitor the pressure in the intermediate space. Changes in the pressure are indicative of a leak in one or both of the seals.

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