FIELD: mechanical engineering. SUBSTANCE: coupling has case 1, pressing out valve 7 with passages, and bushing 11. In addition coupling has valve 5 mounted on stem 5 of main valve 7 whose outer side is provided with labyrinth grooves 9 to form tight spaces with inner sides of cylinder 10 made on bushing 11 provided with passages 12. Passages of the main valve are arranged on its face. EFFECT: enhanced reliability. 1 dwg
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