Ball valve repair attention

Ball valve has a longer service life and maintenance-free period, will depend on the following factors: normal working conditions, to maintain a harmonious temperature / pressure ratio, and reasonable corrosion data. Note: ● Ball valve is still in the closed state, there is still pressure fluid within the body ● Before the repair, lifting the pipeline pressure and the valve is in the open position ● Maintenance, disconnect the power or gas source ● Maintenance before the actuator and the stent off 1), the packing should be re-locked If there is a slight leakage at the culvert culvert, to be re-locked stem nut. Note: Do not lock too tight, usually locked 1/4 turn ~ 1 circle, the leak will stop. 2), replace the valve seat and seal A), disassemble the valve in the half-open position, rinse, clear the body of dangerous substances may exist inside and outside. Close the ball valve, remove the connecting bolts and nuts on both flanges and remove the valve completely from the pipe. Disassemble the drive unit in sequence - actuator, connecting bracket, lock washer, stem nut, butterfly shrapnel, gland, wear plate, stem packing. Remove the cover connection bolts and nuts, separate the cover from the valve body, and remove the cover gasket. Make sure the ball is in the "off" position, which makes it easier to take it out of the valve body and then remove the valve seat. Push the valve stem down through the hole in the valve body until it is completely removed, then remove the O-ring and stem underfill. CAUTION: Exercise caution to avoid scratching the stem surface and the stuffing box sealing area of ​​the valve body. B), reassembly and cleaning and inspection of parts removed, it is strongly recommended to replace the spare parts package seat and gaskets and other gaskets seals. Assemble in the reverse order of disassembly. With the specified torque, cross-lock the flange connection bolts. With the specified torque, lock the stem nut. After installing the actuator, input the corresponding signal to rotate the valve core by rotating the valve stem to open and close the valve. If possible, please pressure-seal the valve and test the performance according to relevant standards before reassembling the pipe.

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