Ball Valve Installation and Maintenance

Apr. 13, 2020

Installation of ball valve

Preparation before installation

1. The pipelines before and after the Ball Valve are ready. The front and rear pipes should be coaxial and the sealing surfaces of the two flanges should be parallel. The pipeline should be able to bear the weight of the ball valve, otherwise the pipeline must be equipped with proper support.

2. Clean the pipelines before and after the valve to remove oil, welding slag and all other impurities in the pipeline.

3. Check the sign of the ball valve and find out that the ball valve is intact. Open and close the valve several times to verify that it is working properly.

4. Remove the protective parts on the connecting flanges at both ends of the ball valve.

5. Check the valve hole to remove possible dirt, and then clean the valve hole. Even small foreign objects between the valve seat and the ball may damage the sealing surface of the valve seat.


1. Install the valve on the pipeline. Either end of the valve can be installed at the upstream end. The valve driven by the handle can be installed at any position on the pipeline. However, the ball valve with gear box or pneumatic driver should be installed upright, that is, installed on a horizontal pipeline, and the drive device is above the pipeline

2. Install a gasket between the valve flange and the pipeline flange according to the requirements of the pipeline design.

3. The bolts on the flange need to be symmetrical, successively and evenly tightened.

4. Connect pneumatic pipeline (when using pneumatic driver).

Inspection after installation

1. Operate the driver to open and close the ball valve several times. It should be flexible without stagnation, confirming that it is working properly.

2. Check the sealing performance of the flange joint between the pipeline and the ball valve according to the design requirements of the pipeline.

Ball Valve

Ball Valve

Maintenance of ball valve

1. Only after confirming that the upstream and downstream pipelines of the ball valve have been relieved of pressure, can the disassembly and decomposition operations be performed;

2. When disassembling and reassembling, care must be taken to prevent damage to the sealing surface of the parts, especially non-metallic parts. Special tools should be used when removing the O-ring;

3. The bolts on the flange must be symmetrically, gradually and evenly tightened during assembly;

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 (GB484-89) can be used to clean metal parts. Clean non-metal parts with pure water or alcohol;

5. The individual parts broken down can be cleaned by dipping. Metal parts with non-decomposed non-metal parts can be scrubbed with a clean and fine silk cloth impregnated with a cleaning agent (to avoid fibers falling off and adhering to the parts). When cleaning, all grease, dirt, glue, dust, etc. adhering to the wall must be removed;

6. Non-metal 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 needs to be assembled after the wall cleaning agent volatilizes (can be wiped with silk cloth without soaking detergent), but it should not be left for a long time, otherwise it will rust and be contaminated by dust;

8. New parts also need to be cleaned before assembly;

9. 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 on the surface of the seal mounting 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;

10. During assembly, metal debris, fibers, grease (except those specified for use), dust and other impurities, foreign objects, etc. should not be allowed to contaminate, adhere or stay on the surface of the parts or enter the inner cavity.

The above is the installation and maintenance of the ball valve introduced by Duplex Stainless Steel Ball Valve Manufacturer.

Xintai Valve Group Co., Ltd.

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