PRESSURE SMALL-SIZED FITTINGS Russian patent published in 2004 - IPC

FIELD: gas and oil industry. SUBSTANCE: pressure small-sized fittings has body with side conduits. One conduit is coupled to hole clearance, other side conduit communicates with tubing through duct in tube suspension with sealing member and internal duct closed from above by string sub. Internal duct of tube suspension has lower and upper threaded parts for connection to tubing and connective element correspondingly. Connective element is employed in round trip operations. Tube suspension is made of upper and lower cylindrical parts. Tube suspension has external annular groove communicating with its internal duct to feed agent into its above-mentioned internal duct. Sealing element comes in the form of two sealing rings. Upper part of tube suspension has holes to accommodate hand tools used in operations of its unscrewing and screwing. Conical reducer to hold tube suspension in body is located between upper and lower parts of it. Substitute is used in the capacity of connective element. EFFECT: reduced dimensions, increased functional reliability and improved handling convenience. 1 dwg