Fully welded ball valve installation:

1, the valve lifting. Lifting should be the right way valve, in order to protect the valve stem, do not sling tied to the hand wheel, gear box or actuator. Protective cap sleeves at both ends of the valve not removed prior to welding.
2, the valve welding process. Buried fully FD-LOK Mini needle valve and trunk pipeline connection to take welding. Weld quality must meet the "disc flexor fusion welded joints radiography" (GB3323-2005) Ⅱ grade sheet standard, usually once a weld does not fully ensure that all qualified, so when ordering valves at both ends of the valve should require manufacturers to increase 1.0m long sleeves, welds failed once there is enough length to cut off defective weld and re-welded ball valve and pipe welding time, the valve should be at 100% full open position, so as not to damage the valve ball welding slag splashing, while ensuring internal valve seal temperature up to 140 degrees Celsius, cooling can take appropriate measures when necessary.
3, install valve well cast. FD-LOK bellows seal valves using a special design, with maintenance-free features, buried on the outside of the valve before coating Pu special anti-corrosion coating, while the three were urgent grease the seat and stem injection tubes, Cavity appropriate to extend the vent pipe and valve stem according to Huang to depth, so that staff can be on the ground to complete the operation. To achieve buried after laying a small hand valve shaft can be, and for conventional non-welded ball valve can not be directly buried, and need a large masonry valve well, the result is the formation of a dangerous confined space, is not conducive to safe operation . At the same time the body itself and the bolt body and the pipe joints will be electrical corrosion, affecting the life of the valve.