| 摘要 |
FIELD: equipment involved in drilling and repair of oil and gas wells. SUBSTANCE: swivel has body with bail, hollow stem with gooseneck, post, radial thrust, upper and lower guide bearing, top pressure seal and unit of lower oil seal of stem. Unit of lower oil seal consists of holder and bushing with collars located in their annular space. Upper guide-bearing is located in holder installed in body for axial motion and engagement with pressure screws installed in post. EFFECT: increased reliability and service life of lower seal, improved and simplified maintenance of swivel. 3 dwg
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