Device for changing gate valves under pressure of sluice type USZSH-35

Device for changing valves under pressure airlock type USSS-35 is intended to work on changing the faulty stem and side valves wellhead valves oil and gas wells under pressure, including content in the downhole environment of hydrogen sulfide in an amount up to 6% volumetric. A distinctive feature of the device USSS-35 from existing analogues is: - reducing the effort input of the packer in the well bore to a minimum; - introduction to the design of packer backing plate with a force sliding in the radial direction of the segments, all the way into the wall of the passage channel wells to eliminate the annular gap between the packer and through the channel of the well.