FIELD: well repairs. SUBSTANCE: shutoff valve of tubing string includes body accommodating shutoff member. Shutoff member consists of supporting bushing with central and periphery channels, spring, ball and valve seat. Installed above valve seat in body is supporting nut with through channels. Rod is arranged in the nut central part. Rod side surface has shaped recesses on its both sides. Pins rigidly secured in supporting nut enter shaped recesses. Rod head has recess for screwdriver. Shutoff valve of tubing string allows reverse circulation after lowering of pump into well. EFFECT: higher efficiency. 1 dwg
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