SHUTOFF DEVICE OF WELLHEAD EQUIPMENT Russian patent published in 2001 - IPC

FIELD: mining, particularly, oil and gas producing industry; applicable in wellhead equipment at oil-gas fields. SUBSTANCE: shutoff device has body, components of flanged joint for wellhead, sealing members of plug and drive rod and sealing members of well-head equipment and well head connections. Body is made in form of cross-member with intersecting internal holes for fluid low and for plugs. Device is provided with threaded adapters forming threaded pair together with body in holes for fluid flow. Adapters are engageable, from one side, with sealing members of plug, and from other side, with sealing members of wellhead equipment and connections. Drive rod is threaded. Plug is limited by side parallel flat and cylindrical surfaces and installed in body hole for reciprocations performed by action of drive rod. Grooves with uniform cross-section are made in body in hole for plug above and below hole for fluid flow. Said grooves accommodate circular sealing members. Plug upper part has hole to receive cylindrical insert with threaded hole for threaded drive rod. Bushing with calibrated hole is installed in hole of plug lower part. Plug lower part is tightly closed by quick-break body cover. EFFECT: provided versatility and multifunctional service of device in use on wellhead equipment under real conditions of field. 2 cl, 1 dwg