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Back Pressure Valve
  There are two types of back pressure valve: one-way and two-way. The one-way back pressure valve can prevent the bottom hole pressure and allow circulating down liquid through the valve. If pressure testing for X-mass tree upon tubing hanger is needed, we must use the two-way back pressure valve.
  The back pressure valve adopt special trapezium threads which is with high strength, difficult to glue and with long life.
  To use back pressure valve and the installation tools cooperatively can install and take out through X-mass tree and control the bottom hole pressure quickly and safely.

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