In various industrial pipeline systems, UPVC/CPVC Valve (DIN/ANSI) has become an important component in many industries due to its excellent chemical stability, corrosion resistance and cost advantages. In order to give full play to the performance of this type of valve, reasonable selection, standardized installation and proper maintenance are essential.
1. Selection Points
(I) Evaluation of Working Condition Suitability
1. Medium Characteristics Analysis**: The medium transported in the pipeline varies greatly, which may be neutral water or highly corrosive acid and alkali solutions. For example, in chemical production, the transportation of various strong acids and alkalis is often involved. At this time, CPVC valves become a better choice because of their stronger corrosion resistance than UPVC valves; in ordinary building water supply and drainage systems, UPVC valves are sufficient to meet the needs.
2. **Temperature and pressure considerations**: The temperature of the medium and the system pressure are key parameters. The applicable temperature range of UPVC valves is relatively narrow, generally below 60℃. If it is a hot water circulation system, the water temperature may exceed this range, and it is necessary to select CPVC valves that can withstand higher temperatures. At the same time, according to the working pressure of the system, select valves with corresponding pressure levels to prevent overpressure from causing valve damage.
(II) Valve type selection
1. **Stop valve**: Suitable for scenarios where flow needs to be accurately controlled and fluid needs to be completely cut off. It has excellent sealing performance and almost no leakage after closing, but the disadvantage is that the fluid resistance is large, which will affect the flow of the system to a certain extent.
2. **Ball valve**: Simple and convenient operation, only need to rotate 90 degrees to achieve fast opening and closing, low fluid resistance, very suitable for pipeline systems that need to frequently open and close valves.
3. **Butterfly valve**: Simple and compact structure, small size, light weight, widely used in large-diameter pipelines. However, its sealing performance is slightly weaker than that of stop valves and ball valves, and it is not very suitable for occasions with extremely high sealing requirements.
(III) Standard compliance
Select valves strictly in accordance with DIN/ANSI standards to ensure that the size, specifications, connection methods, etc. of the valves are consistent with the system requirements, and ensure that the valves can be installed smoothly and work with the entire pipeline system.
2. Installation points
(I) Preliminary preparations
1. **Valve inspection**: After receiving the valve, carefully check the appearance to see if there are scratches or deformations, whether the seals are intact, and ensure that the valves are not damaged during transportation.
2. **Pipeline cleaning**: Thoroughly remove debris in the pipeline, such as welding residues, rust, dust, etc., to prevent these impurities from entering the valve and causing the valve to get stuck or not seal tightly.
(II) Practical steps for installation
1. **Connection method**: According to the connection type of the valve, such as threaded connection, pay attention to the direction of rotation and tightening force of the thread to avoid over-tightening or over-loosening; for flange connection, ensure that the flange surface is flat, the gasket is installed correctly, and the bolts are tightened evenly.
2. **Flow direction mark**: There are clear fluid flow direction marks on the valve. Be sure to follow the marked direction during installation to ensure that the medium can pass through the valve smoothly, otherwise it will affect the normal function of the valve and even cause valve damage.
3. **Installation force**: During the installation process, do not use brute force to twist or stretch the valve, and do not hit it hard with tools such as hammers to avoid damaging the internal structure and sealing performance of the valve.
3. Maintenance points
(I) Regular inspection
1. **Appearance inspection**: Regularly check the surface of the valve to observe whether there are signs of leakage, whether the valve body is corroded or deformed, and take timely measures once a problem is found.
2. **Operation test**: Regularly manually operate the valve to check whether its switch is flexible and whether the valve stem is stuck. If there is any abnormality, promptly investigate the cause.
(II) Cleaning and maintenance
1. **Surface cleaning**: Regularly wipe the surface of the valve with a clean cloth to remove dirt and dust to prevent impurities from accumulating and corroding the valve.
2. **Component lubrication**: Apply an appropriate amount of lubricant to the moving parts of the valve, such as the valve stem and handwheel, to ensure smooth operation and reduce wear.
(III) Troubleshooting
Once a valve failure is found, such as leakage, failure to open and close normally, etc., it should be repaired in time. For valves that are severely damaged and cannot be repaired, new valves should be replaced in time to avoid affecting the normal operation of the entire pipeline system.
Mastering the selection, installation and maintenance points of UPVC/CPVC Valve (DIN/ANSI) can effectively improve the stability and reliability of the pipeline system. If you have any questions in practical applications, please feel free to communicate.
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