Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1980-04-30
1982-04-06
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
251 1A, 251368, E21B 3306
Patent
active
043232566
ABSTRACT:
An improved seal for a blowout preventer ram which can be moved into and out of engagement with a length of pipe and includes intersecting recesses formed in the outer surfaces of the ram body for accommodating seal for forming a pressure-tight seal around the length of pipe and between the ram and at least a portion of a housing in which the ram moves when the ram engages the pipe. The seal includes a front seal with a curved portion shaped to engage the length of pipe and a body portion formed of an elastomeric material shaped to fit within one of the recesses in the ram. An insert in the body portion is formed of a deformable material with low friction properties and positioned to engage the pipe when the ram is in its engaging position. The insert is held between a pair of rigid retainer plates oriented perpendicular to the pipe. The seal engages a second top seal located in the other recess and pushes it outwardly into sealing positions when force is exerted on the front seal.
REFERENCES:
patent: 2593793 (1952-04-01), Rector
patent: 2644804 (1953-07-01), Rubin
patent: 2908537 (1959-10-01), Kipp
patent: 3880436 (1975-04-01), Canal
patent: 3904212 (1975-09-01), Pugh et al.
patent: 3946806 (1976-03-01), Meynier
patent: 4265424 (1981-05-01), Jones
Miyagishima Tosh
Motoda Calvin
Hydril Company
Smith Robert I.
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