Packoff and seal ring assembly with injected plastic packing
AssigneeCameron Iron Works, Inc.
InventorDelbert E. Vanderford, Jr.
Life of this patent
Estimating the term…
Abstract
A packoff for sealing between an external cylindrical surface and a member therearound having a resilient ring, metal seal rings on the end surfaces of the resilient ring, the exterior of the resilient ring being concave to provide an annular recess, means for injecting and pressurizing plastic packing in said annular recess to cause sealing engagement of said metal seal rings and means to prevent leakage of pressure from the annular recess, and the inner and outer flanges on said metal seal rings providing a metal-to-metal seal.
Claims28
A packoff for sealing an annulus around a tubular member comprising
- an outer member having an annular recess on its inner surface,
- a seal ring assembly in the recess including a resilient ring having inner and outer surfaces and end surfaces and a pair of metal seal rings on said end surfaces with flanges extending on said inner surface, and
- means on the outer member for injecting plastic packing into said recess,
- said injecting means pressurizing the seal ring assembly in said recess sufficiently to ensure sealing engagement of said metal seal rings with said tubular member.
A seal comprising
- a first member having an external cylindrical surface,
- a second member surrounding said first member and having a bore, a counterbore and a shoulder therebetween,
- a seal ring assembly positioned within said counterbore against said shoulder and including a resilient ring having inner and outer surfaces and end surfaces and a pair of metal seal rings on the end surfaces of said resilient ring,
- means for retaining said sealing ring assembly against said shoulder,
- the outer surface of said resilient ring being partially spaced from said counterbore to provide an annular space,
- means for injecting plastic packing into said annular space, and
- means for preventing pressure exerted on said plastic packing from leaking away from said annular recess,
- said injecting means pressurizing the plastic packing in said recess sufficiently to ensure sealing engagement of said metal seal rings between said first member and said second member.
A seal ring assembly for sealing between the cylindrical exterior surface of a first member and a surface on a second member surrounding said first member comprising
- a resilient ring having inner and outer surfaces and side surfaces, and
- a pair of metal seal rings on the end surfaces of said resilient ring,
- the exterior of said resilient ring being concave to receive plastic packing for energizing said resilient ring and said metal seal rings into sealing engagement.
Dependencies are inferred from the claim text.