Installation and maintenance of ball valve

1、 Confirm the preparatory work of ball valve before installation 1 Ensure the installation position of ball valve and the pipeline are in the coaxial position The two flanges on the pipeline shall be parallel Confirm that the pipeline can bear the weight of ball valve If the pipeline cannot bear the weight of ball valve, provide corresponding support for the pipeline before installation 2 Confirm whether there are impurities and welding slag in the pipeline, and purge the pipeline 3 Check the nameplate of the ball valve, and operate the ball valve fully open and closed several times to confirm that the valve can work normally, and check all details of the valve once again to ensure that the valve is intact 4 Remove the protective covers at both ends of the valve, check whether the valve body is clean, and clean the inner cavity of the valve body Because the sealing surface of the ball valve is ball shape, even small sundries may cause damage to the sealing surface II Installation of ball valve 1 Any section of the ball valve can be installed at the upstream end, and the handle ball valve can be installed at any position of the pipeline If the ball valve of the actuator (such as gearbox, electric pneumatic actuator) is configured, it must be installed vertically, and the inlet and outlet of the valve are in the horizontal position 2 Install gasket between ball valve flange and pipeline flange according to pipeline design requirements 3 The bolts on the flange shall be tightened symmetrically, step by step and evenly 4 If the ball valve adopts pneumatic and electric actuators, complete the installation of air source and power supply according to the instructions 3、 Inspection after installation of ball valve 1 After installation, start the ball valve to open and close several times, which should be flexible, evenly stressed and work normally 2 According to the design requirements of pipeline pressure, check the sealing performance of the joint surface of ball valve and pipeline flange after pressure 4、 Maintenance of ball valve 1 Only when the pressure before and after the ball valve is removed can the ball valve be disassembled 2 In the process of disassembling and reassembling the ball valve, it is necessary to protect the sealing parts, especially the non-metallic parts, such as the O-ring and other parts Zui to use special tools 3 When reassembling the ball valve body, the bolts must be tightened symmetrically, step by step and evenly 4 The cleaning agent shall be compatible with rubber parts, plastic parts, metal parts and working medium (such as gas) in the ball valve When the working medium is gas, the metal parts can be cleaned with gasoline (gb484-89) Clean non-metallic parts with pure water or alcohol 5 The disassembled individual parts can be washed by immersion For the metal parts that have not been decomposed, clean and fine silk cloth impregnated with cleaning agent (to avoid fiber falling off and adhering to the parts) can be used for scrubbing During cleaning, all grease, dirt, glue and dust adhering to the wall surface shall be removed 6 The non-metallic parts shall be taken out of the cleaning agent immediately after cleaning, and shall not be soaked for a long time 7 After cleaning, it needs to be assembled after the cleaning agent of the washed wall volatilizes (it can be wiped by the silk cloth without cleaning agent), but it can not be used for a long time, otherwise it will rust and be polluted by dust 8 New parts shall also be cleaned before assembly 9 Use grease for lubrication The grease shall be compatible with the metal materials, rubber parts, plastic parts and working medium of ball valve When the working medium is gas, for example, te221 grease can be used Apply a thin layer of grease on the surface of the installation groove of the seal, rubber seal and the sealing and friction surfaces of the valve rod 10 During assembly, metal chips, fibers, grease (except those specified) dust and other impurities and foreign matters shall not be allowed to contaminate, adhere to or stay on the surface of parts or enter the inner cavity.