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Application filed by Веніамін Дмитрович Куртов, Вениамин Дмитриевич Куртов, Адольф Якович Глушаков, Адольф Яковлевич Глушаков, Петро Антонович Озарчук, Петр Антонович Озарчук, Богдан Онуфрійович Волошінівський, Богдан Онуфриевич Волошинивский, Юрій Семенович Штанько, Юрий Семенович ШтанькоfiledCriticalВеніамін Дмитрович Куртов
Priority to UA4735607ApriorityCriticalpatent/UA6782A/en
Publication of UA6782ApublicationCriticalpatent/UA6782A/en
Check valve for drill string has hollow body, seat and spring-supported shutoff element installed one under another in cavity, shell placed concentrically in cavity of the body, movable in axial direction, wit collar in upper part and seal. It is equipped with centering ring installed on the inner surface of the body over the seat, shell in whole length forms a gap with inner surface of the body and seat. Collar of shell is made conical, and body over the seat has respective conical surface for interaction with it.
UA4735607A1989-07-071989-07-07Check valve for drill string
UA6782A
(en)