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Precautions for using control valves: 1. Before installing the valve in the pipeline, make sure the pipeline is clean; when performing maintenance or disassembly, avoid allowing contaminants to enter the pipeline or mix into the instrument accessories. 2. Pay attention to the cleanliness of the working medium as well as the cleanliness of the instrument’s air supply. 3. When using control valves, it is necessary to carry out proper maintenance and inspection on them. 4. Be adept at identifying faults in control valves and addressing them promptly. 5. Do not focus solely on vulnerable components; pay attention to non-vulnerable components as well. 6. Protect your valve information (valve nameplate); a user profile is recommended. Incorrect maintenance habits*: 1. Adding more packing on top of the existing packing assembly. 2. Do not remove the packing without removing the valve cover from the valve body. 3. It is believed that the diaphragm does not need to be replaced regularly. 4. It is assumed that the valve cage is not prone to damage, so no thorough inspection of it is carried out. And continue to use it. Repair of valve metal parts: 1. Welding repairs shall not be used for any internal valve components. 2. The repair of valve internals may only be carried out using cold working methods such as grinding, sharpening, and minor cutting. 3. Metal parts become irreparable when they are damaged to a certain extent. 4. The repair of the valve body can be carried out by patch welding, but appropriate welding materials and methods must be selected based on the material of the valve body. 5. It is essential to repair metal parts in a timely manner to prevent damage from reaching a level that cannot be repaired, resulting in the part becoming unusable. Grinding and cutting principles for valve metal parts: 1. Whether to use grinding or cutting methods to repair damaged parts depends on the extent of the damage. 2. If the damage to the part is severe, it should be repaired using machining methods or replaced with a new part. 3. If the valve seat is slightly damaged and causing leakage, grinding can be used to improve its sealing performance. 4. When a valve is leaking, grinding is not suitable in all cases, and it does not guarantee valve sealing. Proper storage of control valve spare parts: Key considerations when selecting spare parts 1. Whether they are indeed vulnerable components (to avoid waste) 2. The quantity of each type of valve (to reduce inventory and save costs) 3. The operating conditions of the valves (to determine the types of spare parts needed) 4. The expected service life of the valves (to determine the timing and type of orders to place) 5. The importance of the valves within the system (to determine the types of spare parts required). Not all parts are vulnerable, and not all vulnerable components are equally susceptible to damage: Ranking of control valve parts based on their vulnerability: 1. Gaskets, packing, seals 2. Bushings, valve shafts, diaphragms 3. Valve cores, seat rings 4. Valve cages 5. Springs, valve bodies