Variable bore ram rubber with non-overlapping inserts

Details Variable bore ram rubber with non-overlapping inserts Variable bore ram rubber with non-overlapping inserts

1990-08-31

1991-09-03

Fox, John C.

Valves and valve actuation

Blow-out preventers

Radial reciprocating ram

277127, 277199, E21B 3306

Patent

active

050446037

ABSTRACT:
An improved sealing device for variable bore ram blowout preventers of the type that uses a pair of opposed semi-cylindrical ram blocks to urge a pair of resilient sealing elements into sealing circumferential contact with the circumferential surface of a tubular drill string component includes a generally uniform thickness sealing member having in plan view the shape of a semi-circular arch with co-linear rectangular legs which protrude laterally outwards from opposite base ends of the arch. The sealing device includes two identical sealing members, each of which has a plurality of laterally spaced apart metal inserts molded into a resilient matrix. Each insert has a pair of generally flat and parallel upper and lower plates joined by a pedestal disposed perpendicularly between the plates. Five inserts are used; two identical, generally square cross-section end inserts, one each located near the outer lateral end of each leg, two identical, trapezoidal cross-section corner inserts, one each laterally inward of each end insert, and a semi-annular cross-section center arch insert within the center arch section, adjacent the corner inserts. Forcible contact of the front face of each sealing member with a tubular component causes the corners inserts to move laterally away from the end inserts and toward the center insert, thereby forming an effective seal with tubular components of various diameters.

REFERENCES:
patent: 4089532 (1978-05-01), Kanyshuikov et al.
patent: 4550895 (1985-11-01), Shaffer
patent: 4930745 (1990-06-01), Granger et al.

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