SUB-SURFACE SAFETY VALVE Russian patent published in 2017 - IPC E21B34/08 

FIELD: mining.

SUBSTANCE: sub-surface safety valve contains a housing, a guide cylinder, a locking device, a switching and locking mechanism in the form of a rod with a longitudinal groove on the outer cylindrical surface and with a plunger pin in the form of two pintles. The housing consists of two parts. The cylinder consists of two cylinders. The locking device comprises a fluid passage assembly in the form of a sleeve with longitudinal slits along the axis connecting the cylinders by means of a coupling device provided with a chamfered hole. Longitudinal slots dividing the locking element into two parts are made on it. O-rings are installed in the element piston body. The mechanism includes a pin fixing assembly in the form of a coupling located in the grooves. The coupling has the possibility of locating the pin head in geometrically adjusted dimensions. The coupling connects the housing parts. The inner surface of each cylinder, the assembly, the locking device, the element outer surface, the mechanism outer surface are covered with a wear-resistant material.

EFFECT: increase and expansion of operational qualities, increased shut-off valve life.

4 dwg