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Valves are widely used in daily life. When installing valves, it is essential to first be aware of the precautions for their installation; following these guidelines can help avoid many troubleshooting issues. Next, we will provide a detailed introduction to the precautions for valve installation. The precautions for valve installation are as follows: 1. The stop valve should be installed so that the flow direction of the medium is in line with the arrow indicated on the valve body. To confine it using medium pressure, valves that are not opened and closed frequently but require strict assurance of no leakage when closed can be installed in reverse. 2. A set of correct installation procedure standards is required. 3. When tightening the compression screw, to avoid damaging the valve seat sealing surface, the valve should be in a slightly open position. 4. To prevent the valve core from tilting to one side due to its heavy weight, large-sized pneumatic control valves and gate valves should be installed vertically; otherwise, leakage will occur. 5. The valve should be installed in the allowable operating position, taking into account the convenience of maintenance and operation. 6. The liquid valve should be configured with the valve stem at a 10° inclination to the horizontal, in order to prevent the liquid from flowing down the stem and, more importantly, to avoid leaks. 7. After the large air separation tower has been cooled in the air, to prevent leaks at normal temperature by avoiding leaks at low temperatures, the flanges of the connecting valves need to be pre-tightened while the tower is still cold. 8. The valve is in a closed state during installation. 9. When installing the valve, it is necessary to clean the sealing surfaces and the internal cavity. It is also important to check whether the packing is properly compressed and whether the connection bolts are tightened evenly. 10. Before positioning, low-temperature valves should be tested for opening and closing as much as possible in a cold state, ensuring smooth operation without any jamming. The above outlines 10 points to keep in mind when installing valves. It is essential to be aware of these points in advance during installation, so as to complete the process more quickly and enable the valves to fulfill their functions effectively.