The valve is lowered to the coiled tubing in the assembly. In the process of carrying out technological operations in the event of back pressure, the valve closes the internal space of the coiled tubing. To open the valve, it is necessary to create backpressure exceeding the pressure formed under the valve.
The back-pressure valve consists of: body, two subs, clamping devices, seat-type valves making up the locking mechanism, seat saddles, springs and seals. The tool contains a small number of parts, which reduces maintenance requirements.
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