Wellhead valves are designed for wellhead sealing; suspension of downhole pipelines; control and monitoring of the working medium flow from the well (during production of the product by gushing or mechanised method) or into the well (for operation in the mode of fluid injection from the RPM system); control over the parameters of downhole and injected medium in the pipe, annulus, intertubular space, carrying out the necessary technological operations during well operation, including overpressure in the well or injection pipelines.
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