Introduction to the installation and maintenance o

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Introduction to the installation and maintenance of ball valve

I. confirm the preparation of ball valve before installation

1. Ensure that the pipeline at the installation position of ball valve is in the coaxial position, and the two flanges on the pipeline should be kept parallel. Confirm that the pipeline can bear the weight of ball valve itself. If it is found that the pipeline cannot bear the weight of ball valve, provide corresponding support for the pipeline before installation in China's plastic machinery market

2. Confirm whether there are impurities, welding slag, etc. in the pipeline, and the pipeline must be purged

3. Check the nameplate of the ball valve, fully open and close the ball valve for several times, confirm that the valve can work normally, and then comprehensively check all details of the valve 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. Since the sealing surface of the ball valve is ball shaped, even small debris 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 with actuator (such as gearbox, electric pneumatic actuator 98.07) is configured, it must be installed vertically, and the inlet and outlet of the valve are in a horizontal position

2. Install sealing gasket between ball valve flange and pipeline flange according to pipeline design requirements

3. The bolts on the flange should be tightened symmetrically, step by step and evenly

4. If the ball valve adopts pneumatic, electric and other actuators, complete the installation of air source and power supply according to the instructions

III. 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 the ball valve works normally

2. According to the design requirements of pipeline pressure, the sealing performance of the joint surface of ball valve and pipeline flange shall be tested after pressurization

IV. maintenance of ball valve

1. The ball valve can be disassembled and disassembled only after the pressure before and after the ball valve is removed. Multi party linkage of research institutions and colleges

2. In the process of disassembly and reassembly of ball valves, it is necessary to protect sealing parts, especially non-metallic parts, such as O-rings, and other parts. It is best 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 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 (GB) can be used to clean metal parts. Clean non-metallic parts with pure water or alcohol

5. Single parts disassembled can be cleaned by immersion. Metal parts that still have non-metallic parts that have not been decomposed can be scrubbed with clean, fine silk cloth impregnated with cleaning agent (to avoid fiber falling off and adhering to the parts). During cleaning, all grease, dirt, glue accumulation, dust, etc. adhered to the wall must be removed

6. Non metallic parts should be taken out of the cleaning agent immediately after cleaning, and should not be soaked for a long time

7. After cleaning, it is necessary to wait for the wall cleaning agent to volatilize (wipe it with silk cloth not soaked in cleaning agent), but do not put it aside for a long time, otherwise it will rust and be polluted by dust. So at this time, even if we contact the manufacturer

8, the new parts need to be cleaned before assembly

9. Lubricate with grease. The lubricating grease shall be compatible with the metal materials, rubber parts, plastic parts and working medium of the ball valve. When the working medium is gas, such as special 221 grease can be used. Apply a thin layer of grease on the surface of the seal installation groove, a thin layer of grease on the rubber seal, and a thin layer of grease on the sealing surface and friction surface of the valve rod

10. During assembly, it is not allowed to have metal debris, fiber, grease (except for specified use), dust, other impurities, foreign matters and other pollution, adhesion or stay on the surface of parts or enter the inner cavity

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