Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor
Reexamination Certificate
1997-12-30
2001-07-31
Brittain, James R. (Department: 3626)
Seal for a joint or juncture
Seal between relatively movable parts
Piston ring or piston ring expander or seat therefor
C277S530000, C277S532000, C277S536000, C277S553000, C277S564000, C277S584000
Reexamination Certificate
active
06267383
ABSTRACT:
TECHNICAL FIELD
The present invention relates to machinery packing and, more particularly, to a composite seal ring structure.
BACKGROUND ART
Seals have been used to isolate fluids at various pressures and temperatures. Such seals have existed for use in packing rings, seal rings; piston rings, and gland structures in industrial equipment such as cylinders, pumps and valves and in oilfield equipment such as downhole tools and surface equipment, requiring seals, for example, against high pressure and low pressure liquids and gases, for reciprocating rods, for pistons, for valves and for other applications.
However, such seals may be eroded and/or extruded or destroyed for machinery equipment wherein sealing needs to be established at the most severe sealing environments, which include seal gland design, pressures, fluid medics and temperatures.
Such seals, whether of the dynamic or static type, are usually made, or have portions made, of materials which, to some extent, are resilient or at least deformable. In order to seal effectively, it is not necessary, but could be possible, that the sealing device be placed under some compressive loading between the components of the assembly to be sealed. Because of the compressing load, there is a tendency for portions of deformable seals to be subjected to extrusion forces which will either distort the seal and impair its effectiveness as a seal or, in more severe cases, force portions of the seal into clearances between the components to be sealed.
In an attempt to overcame this extrusion problem, workers in the field have resorted to various techniques. One common practice employed to prevent such extrusion is the use of a back-up ring of knitted mesh as shown in U.S. Pat. No. 4,219,204. Additionally, seals having the seal lip configuration with an insert discussed below are also known in the art and are manufactured by Parker Seal Company, polypac seal.
DISCLOSURE OF THE INVENTION
A composite seal ring is disclosed having an elastomeric section and a mesh anti-extrusion backup device in which the elastomeric section is seated. Compatible lip and backup materials are disclosed to service the desired sealing environments. The design of the seal lip of the elastomeric section provides sufficient “preloading” or squeeze in the gland area to initiate sealing. The face of the sealing lip is “V” shaped which provides a pressure sensitive area to effect a seal in elevated pressures which can replace an entire V packing set or other seals. The anti extension device is molded of a knitted wire mesh and provides a backup to the sealing lip in high pressures and extreme clearance gaps between the seal gland and the bore or rod which reduces the requirement for elaborate metal or plastic anti-extrusion devices.
REFERENCES:
patent: 2844421 (1958-07-01), Hayman
patent: 2927830 (1960-03-01), Workman
patent: 3810639 (1974-05-01), Scannell
patent: 4013299 (1977-03-01), Scott
patent: 4040636 (1977-08-01), Albertson et al.
patent: 4219204 (1980-08-01), Pippert
patent: 4281590 (1981-08-01), Weaver
patent: 4473231 (1984-09-01), Tilton et al.
patent: 5287951 (1994-02-01), Voit et al.
patent: 5306021 (1994-04-01), Morvant
patent: 5493951 (1996-02-01), Harrison
patent: 5551703 (1996-09-01), Morvant
patent: 0506965 (1954-11-01), None
Beres John L.
Brittain James R.
Ostfeld David M.
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