FIELD: mining industry. SUBSTANCE: device has cylindrical body with flanges. Body accommodates lower and upper sealing members with central axial channel successively located relative to wellhead. Lower sealing member is located in sleeve. Device is provided with spring- loaded wedge member and pressure nuts. Lower and upper sealing members are fixed relative to body by pressure nuts. Lower sealing member has labyrinth combs and is rigidly secured in sleeve. Upper sealing member has detect to prevent reversing and labyrinth combs. Sealing members are cylindrical. Sleeve is located for axial motion. Body internal surface has conical part. Located between said body conical part and upper sealing member is spring-loaded wedge member. Sealed space is formed between lower sealing member and sleeve. EFFECT: higher operate reliability of device. 1 dwg
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