Thread Content
Valves are piping accessories used to open and close pipelines, control the flow direction, and regulate and control the parameters of the conveyed medium (temperature, pressure, and flow rate). Based on their function, they can be classified into shut-off valves, check valves, control valves, etc. Valves are control components in fluid transportation systems, with functions such as shutting off flow, regulating it, directing its flow, preventing backflow, stabilizing pressure, diverting flow, or releasing pressure through overflow. Valves used in fluid control systems range from the simplest stop valves to various types of valves employed in highly complex automated systems; there is a great variety of such valves in terms of models and specifications. Valves can be used to control the flow of various types of fluids, including air, water, steam, various corrosive substances, mud, oils, liquid metals, and radioactive materials. Valves can also be classified by material into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316, etc.), chromium-molybdenum steel valves, chromium-molybdenum-vanadium steel valves, duplex steel valves, plastic valves, and custom-made valves. 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 prevent many troubleshooting issues. Today, the editor will provide you with 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 sealing surface on the valve top, 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 interior 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, requiring 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 fully utilize their advantages. If you want to learn more interesting facts about instrument automation, follow me!