In order to make the ball valve have a long service life and maintenance-free period, in addition to normal working conditions, maintaining a harmonious temperature/pressure ratio, and reasonable corrosion data, it will also rely on the following considerations:

●When the ball valve is closed, there is still pressurized fluid inside the valve body.

●Before servicing the ball valve, depressurize the line and keep the valve in the open position.

●Before maintenance of the ball valve, disconnect the power supply or air supply.

●Before maintenance, disengage the actuator from the bracket.

●The disassembly and decomposition operation can only be carried out after confirming that the upstream and downstream pipelines of the ball valve have been depressurized.

●During disassembly and reassembly, care must be taken to prevent damage to the sealing surfaces of parts, especially non-metallic parts, and special tools should be used when taking out the O-ring.

●When the ball valve is assembled, the bolts on the flange must be tightened symmetrically, gradually and evenly.

●The cleaning agent should be compatible with the rubber parts, plastic parts, metal parts and working medium (such as gas) in the ball valve. When the working medium is gas, gasoline can be used to clean metal parts. Clean non-metallic parts with pure water or alcohol.

●The disassembled single parts can be cleaned by dipping. The metal parts with undecomposed non-metal parts can be scrubbed with a clean and fine silk cloth impregnated with FLOWER HANDLE, MACHINE POLISH AND OUT CHROME, 3/8"X10MM ANGLE VALVES cleaning agent (to prevent the fibers from falling off and adhering to the parts). When cleaning, all grease, dirt, glue, dust, etc. adhering to the wall must be removed.

●The non-metal parts should be removed from the cleaning agent immediately after cleaning, and should not be soaked for a long time.

●After cleaning, it needs to be assembled after the cleaning agent on the wall surface to be washed has evaporated (it can be wiped with a silk cloth not soaked in the cleaning agent), but it should not be put on hold for a long time, otherwise it will rust and be polluted by dust.

●New parts also need to be cleaned before assembly.

●Use grease for lubrication. Grease should be compatible with ball valve metal materials, rubber parts, plastic parts and working medium. When the working medium is gas, for example, special 221 grease can be used. Apply a thin layer of grease on the surface of the seal installation groove, apply a thin layer of grease on the rubber seal, and apply a thin layer of grease on the sealing surface and friction surface of the valve stem.

●During assembly, no metal chips, fibers, grease (except those specified for use), dust, other impurities, foreign objects, etc. should be allowed to contaminate, adhere or stay on the surface of the parts or enter the inner cavity.

1) The packing should be re-tightened. If there is micro-leakage at the packing, the stem nut must be re-tightened. Note: Do not lock too tightly, usually lock for 1/4 turn to 1 turn, and the leakage will stop.

2), replace the valve seat and seal

A), disassembly:

Keep the valve in the half-open position to flush and remove any dangerous substances that may exist inside and outside the valve body.

Close the ball valve, remove the connecting bolts and nuts on both flanges, 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.

Note: Please be careful to avoid scratching the stem surface and the valve body stuffing box sealing part.

B), reassembly:

Clean and inspect the removed parts, and it is strongly recommended to replace the seat and valve cover gaskets and other seals with a spare parts kit.

Assemble in the reverse order of disassembly.

To the specified torque, cross-lock the flange connection bolts.

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.