When installing plug valves, it is important to consider the following aspects to ensure their normal operation and prolong their service life:

1. Selecting the Appropriate Valve Type:

- The installation position should facilitate operation, maintenance, and inspection.

- Consider the compatibility with other pipeline equipment and the impact of surrounding environmental conditions.

- Select the appropriate type based on the operating conditions.

2. Verifying Dimensions and Connection Methods:

- Verify if the valve dimensions and connection methods meet the actual requirements.

- Ensure a tight connection between the valve and the pipeline, using suitable sealing materials.

3. Cleaning the Pipeline:

- Thoroughly clean the interior of the pipeline before installing the plug valve to ensure no residues or impurities are present.

4. Proper Installation of Sealing Components:

- During valve installation, ensure that the sealing components are installed correctly, without damage or aging.

- Check the performance of the sealing components to ensure effective sealing between the valve seat and the valve core.

5. Adjusting the Drive Mechanism:

- If the plug valve is equipped with an electric or pneumatic drive mechanism, it should be adjusted and set according to operational requirements.

- Ensure that the drive mechanism coordinates well with the valve and can correctly control the valve's opening and closing actions.

During the use of plug valves, certain faults may occur, such as sealing leaks and inflexible rotation. The following maintenance measures can be taken to address these faults:

1. Sealing Leaks:

- Check if the machining precision and smoothness of the sealing surfaces meet the requirements, and re-grind if necessary.

- Remove any abrasive particles or impurities from the sealing surfaces and repair any scratched sealing surfaces.

- Regularly inspect the oil circuit of oil-sealed plug valves to ensure it remains unobstructed and is lubricated on time.

- For self-sealing plug valves, regularly inspect and clean the drain holes to prevent blockages by foreign materials.

2. Inflexible Rotation:

- Check for any obstruction or jamming in the valve stem and valve core, and remove foreign objects.

- Ensure that the lubrication conditions are good, and reapply lubrication if necessary.

- Check if the hand wheel position is worn; if damaged, repair it promptly.