Ball valve maintenance precautions

1. The packing should be locked again

If there is slight leakage at the packing, the stem nut must be locked again. But don't lock it too tightly, usually lock it for 1/4 turn to 1 turn, and the leakage will stop.

2. Replace the valve seat and seal

1. Disassembly

Put the valve in the half-open position, flush and remove the possible dangerous substances inside and outside the valve body, close the ball valve, remove the connecting bolts and nuts on the flanges on both sides, and then completely remove the valve from the pipeline. Disassemble the drive device in sequence - actuator, connecting bracket, lock washer, stem nut, butterfly shrapnel, glam, wear-resistant sheet, stem packing.

Remove the body cover connecting bolts and nuts, separate the bonnet from the body, and remove the bonnet gasket. Make sure the ball valve is in the "closed" position, which makes it easier to remove it from the body and then the seat. Gently push the valve stem downward from the hole in the valve body until it is completely removed, and then take out the O-ring and the packing under the valve stem. However, please operate with caution to avoid scratching the surface of the valve stem and the sealing part of the valve body stuffing box.

2. Reassembly

After cleaning and checking the dismantled parts, it is strongly recommended to replace the valve seat and valve cover gasket and other seals with spare parts kits, assemble them in the reverse order of disassembly, and cross-lock the flange connection bolts with the specified torque. Tighten the stem nut with the specified torque.

After installing the actuator, input the corresponding signal to drive the valve core to rotate by rotating the valve stem, so that the valve can be opened and closed. If possible, perform a pressure tightness test and performance test on the valve according to the relevant standards before reinstalling the pipeline.