◆ Back pressure valve:
　　Back pressure valve with one-way and two-way two, one-way valve to prevent back pressure and allow the downhole pressure circulating fluid down through the back pressure valve. If you need more than the tubing hanger Christmas tree for the pressure test, you must use two-way back-pressure valve.
　　Back pressure valve on the tooth with a special trapezoidal thread short, high intensity, easy to glue, long life.
　　Install back pressure valve and back pressure valve can be removed with the use of tools to install and remove the Christmas tree, so fast, secure complete control of the bottom-hole pressure.

◆ Pressure test, remove the tool
　　Pressure test, remove the tool is our standard, it is the dual role of reducing the types of parts, it can be placed in the casing or casing head within the first four-way, in the drilling or workover, regardless of whether there is drilling wells are through the drill pipe, of the blowout preventer, manifold pressure test, etc.. After U-turn can be set into or wear out.

◆ Wear sleeve
　　Applied to drilling or workover wear process, to protect the casing head and casing head Stone, it is connected through the drill pipe pressure test on the removal tool into the casing to casing head or within the first four-way, and through the set of Stone pipe head or casing head flange on the top wire lock fixed.

◆ VR plug removal tool installed
　　VR blocking valve replacement is the installation of wellhead removal tool with a pressure valve replacement or repair of an important tool. It consists of connecting the body, cylinder, piston rod, end caps, valves, hand wheels and other components. VR using the tool can be installed in the casing head block, casing head Stone, tubing on the head side of the mouth to replace or repair the valve with pressure.