Ensure that pvc ball valve the pipeline at the installation position of the ball valve is at the coaxial position. The two flanges on the pipeline should be kept parallel. Make sure that the pipeline can bear the weight of the ball valve. If it is found that the pipeline cannot bear the weight of the ball valve, the pipeline should be equipped with appropriate support before installation.Confirm the preparation of the ball valve before installation.Make sure that the pipeline at the installation position of the ball valve is at the coaxial position, and the two flanges on the pipeline should be kept parallel. Make sure that the pipeline can bear the weight of the ball valve. If it is found that the pipeline cannot bear the weight of the ball valve, the pipeline should be equipped with appropriate support before installation.Confirm whether there are impurities, welding slag, etc. in the pipeline, the pipeline must be cleaned.
Check the nameplate of the ball valve, and fully open and close the ball valve several times to confirm that the valve can work normally, and then check all the details of the valve to ensure that the valve is intact.Remove the protective caps at both ends of the valve, check whether the valve body is clean, and clean the cavity of the valve body. Since the sealing surface of the ball valve is spherical, even small debris may cause damage to the sealing surface.Installation of ball valve.Any section of the ball valve can be installed at the upstream end, the handle ball valve can be installed at any position of the pipeline, if the ball valve of the actuator such as gear box, electro-pneumatic actuator is configured, it must be installed vertically, the valve inlet and outlet In horizontal position on. Install the gasket between the ball valve flange and the pipeline flange according to the pipeline design requirements.The bolts on the flange need to be symmetrical, successively and evenly tightened.
If the ball valve adopts pneumatic or electric actuators, complete the installation of air source and power supply according to the instructions. Inspection after installation of ball valve.After the installation is completed, start the ball valve to open and close several times. It should be flexible, uniform in force, and work normally.According to the design requirements of the pipeline pressure, the sealing performance of the joint surface of the ball valve and the pipeline flange is checked after the pressure is applied.Maintenance of ball valveOnly remove the pressure before and after the ball valve to disassemble and disassemble the ball valve.In the process of disassembling and reassembling the ball valve, it is necessary to protect the sealing parts, especially non-metal parts, such as O-rings and other parts, it is best to use special tools.When the ball valve body is reassembled, the bolts 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-metal parts with pure water or alcohol.The decomposed individual parts can be cleaned by dipping. Metal parts with non-decomposed non-metal parts can be scrubbed with a dry rotor-pumped clean silk cloth impregnated with cleaning agent (to prevent fibers from falling off and adhering to the parts. When cleaningAll grease, dirt, glue, dust, etc. adhering to the wall must be removed.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 wall cleaning agent has been volatilized (can be wiped with 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.Lubricate with grease. Grease should be compatible with ball valve metal materials, rubber parts, plastic parts and working media. When the working medium is gas, for example, special 221 grease can be used. Apply a thin layer of grease to the surface of the seal installation groov.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, metal debris, fibers, grease except those specified for use, dust and other impurities, foreign objects, etc. shall not be allowed to contaminate, adhere or stay on the surface of the parts or enter the inner cavity.
