MULTISTEP ISOLATION OF WELL AND HYDRAULIC FRACTURING
FIELD: instrument making.SUBSTANCE: according to one aspect of proposed invention, disclosed is a valve for hydraulic fracturing, comprising one or more ports, a coupling capable of occupying a closed position whereat it prevents fluid flow through said one or more ports, and an open position whereat it ensures possibility of fluid flow through said one or more ports. Coupling is configured to change from closed position to open and valve seat, receiving ball and detachably connected with said coupling. Transition of coupling from closed position to open is caused by ball falling into said valve seat. According to another aspect of implementation of present invention, disclosed is a valve for hydraulic fracturing, which comprises a valve seat to receive ball, which is detachably installed inside valve tool. Said valve seat has an accommodating profile providing reception of ball. Said accommodating profile along radius of curvature is matched with ball to ensure non-deforming cover of ball.EFFECT: higher efficiency of valve tool.19 cl, 6 dwg