Having a long service life and maintenance-free period will depend on the following factors: normal working conditions, maintaining a harmonious temperature/pressure ratio, and reasonable corrosion data
When the ball valve is closed, there is still pressurized fluid inside the valve body
Before maintenance: relieve the pipeline pressure and leave the valve in the open position; disconnect the power or air source; separate the actuator from the bracket
It is necessary to find out that the upstream and downstream pipelines of the ball valve have indeed been relieved of pressure before disassembly and decomposition can be carried out.
Care must be taken to prevent damage to the sealing surface of parts, especially non-metal parts, when disassembling and reassembling. Special tools should be used when removing O-rings.
The bolts on the flange must be tightened symmetrically, gradually and evenly during assembly
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 (GB484-89) can be used to clean the metal parts. Clean non-metal parts with pure water or alcohol
Non-metal parts should be taken out of 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 of the washed wall surface is volatilized (can be wiped with a silk cloth not soaked in cleaning agent), but it should not be left for a long time, otherwise it will rust and be contaminated by dust.
New parts also need to be cleaned before assembly
When assembling, it should not be allowed to pollute, adhere or stay on the surface of the parts or enter the cavity with metal chips, fibers, grease (except those specified), dust, other impurities, and foreign objects. Then tighten the stem nut.
Note: Don't lock it too tightly, usually lock 1/4 turn to 1 turn, the leakage will stop.

A), disassembly
Keep the valve in a half-open position to flush and remove dangerous substances that may exist 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-actuator, connecting bracket, lock washer, stem nut, butterfly shrapnel, glam, wear-resistant sheet, stem packing in order.
Remove the body cover connecting bolts and nuts, separate the valve cover from the valve body, and remove the valve cover gasket.
Make sure that the valve ball is in the "off" position. This will make it easier to take it out of the valve body, and then take out the valve seat.
Gently push the valve stem down from the hole in the valve body until it is completely taken out, and then take out the O-ring and the lower packing of the valve stem.
Note: Please operate carefully to avoid scratching the surface of the valve stem and the sealing part of the valve body stuffing box.

B), reassembly
Clean and inspect the removed parts. It is strongly recommended to replace the valve seat and valve cover gaskets with spare parts kits.
Assemble in the reverse order of disassembly.
Use the specified torque to tighten the flange connecting bolts crosswise.
Tighten the stem nut with the specified torque.
After installing the actuator, input the corresponding signal to drive the spool to rotate by rotating the valve stem to make the valve open and close.
If possible, please perform pressure seal test and performance test on the valve according to relevant standards before reinstalling the pipeline.

ZHEJIANG QIAI TUBING INDUSTRY CO.,LTD was established in 1996, is professional China Ball Valves Manufacturers and Ball Valves factory. QIAI Based on excellent management,relying on the perfect quality system .All the productions passed by ISO9001 international quality management systerm,Certificated by CE.Our main products include: PP-R pipes and fittings,Aluminum pipes and fittings, PE-RT pipes and fittings,Brass Fittings,Water and Gas Valves, Stainless Steel Corrugated Flexible Gas hose, wholesale Ball Valves, and so on.At present, the company's product sales network has spread all over the world, establish and improve the quality, efficient and fast professional marketing management team and service support system for the vast number of users, welcome!