Sealing system for the outlet of a plastic-lined compressed gas cylinder
AssigneeDynetek Industries Ltd.
InventorsJeffrey J. SHARP, Mark DUNCAN
Life of this patent
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Abstract
A sealing system for an outlet of a plastic-lined cylinder has a plastic liner outlet extending into a bore of a boss. An insert is engageable with the bore, forming a primary seal between the insert and portion of the liner outlet. A tapered compression surface of the insert engages a tapered bore portion of the liner outlet adjacent the primary seal forming a tapered interface and a secondary seal. An axial position in the boss, and dimensional integrity, of the liner outlet is maintained by engaging an annular distal end of the liner outlet in the bore by a stop. The stop can be formed on the insert.
Claims19
A sealing system for an outlet of a plastic-lined cylinder for compressed gas, the plastic-lined cylinder comprising a plastic liner and a boss, the boss having a bore for accessing the cylinder, the sealing system comprising:
- a liner outlet of the plastic liner extending axially into the bore of the boss to form a profiled bore, the profiled bore comprising a liner section and a boss section, the liner section comprising a cylindrical, sealing bore portion, a tapered bore portion, and an annular distal end having an axial position in the boss's bore, and the boss section comprising an insert-securing bore portion;
- an insert having a profiled surface and engageable with the profiled bore for sealing the profiled bore, the insert's profiled surface comprising an annular seal element, a tapered compression surface, and a bore-securing surface;
- and
- a retaining shoulder;
- wherein, when the bore-securing surface axially engages the insert-securing bore portion, the insert's profiled surface engages the profiled bore, the seal element corresponding and sealing with the sealing bore portion to form an annular primary seal, the retaining shoulder engaging the annular distal end for retaining the annular distal end at the axial position in the boss's bore, and the tapered compression surface corresponding and engaging with the tapered bore portion for forming an annular tapered interface and compressing the liner outlet to form a tapered secondary seal.
The sealing system of claim 4, wherein the tapered interface is axially spaced from the annular recess.
A method for sealing an outlet of a plastic-lined cylinder for compressed gas, the plastic-lined cylinder comprising a plastic liner and a boss, the boss having a bore for accessing the cylinder, the method comprising:
- axially extending a liner outlet of the plastic liner into the bore of the boss to form a profiled bore;
- and
- engaging an insert having a profiled surface into the profiled bore for forming an annular primary seal and an annular secondary seal with the profiled bore liner outlet by:
- axially inserting the insert into the profiled bore and engaging a bore-securing surface on the insert with a insert-securing bore portion of the profiled bore for securing the insert to the boss;
- engaging an annular seal element of the profiled surface insert with a cylindrical sealing bore portion of the profiled bore for forming the primary seal by,
- compressing a tapered compression surface of the profiled surface with an tapered bore portion of the profiled bore for forming an annular tapered interface, the tapered interface forming the secondary seal;
- and
- maintaining an axial position of an annular distal end of the liner outlet in the boss's bore by retaining the annular distal end of the liner outlet against a stop.
A method for servicing a sealing system of an outlet of a plastic-lined compressed gas cylinder, the cylinder comprising a plastic liner and a boss, the boss having a bore for accessing the cylinder which is normally sealed with an insert, the method comprising:
- disengaging the insert from the outlet of the cylinder for exposing a profiled bore of a liner outlet extending axially into the bore of the boss;
- replacing an annular seal element located about the insert, the seal element normally sealably engaging the profiled bore;
- and
- refurbishing at least one sealing surface located on the profiled bore.
Dependencies are inferred from the claim text.