Thread Content
In actual use, many problems with control valves are not caused by the quality of the valves themselves, but rather by improper installation or use of them – factors such as an inappropriate installation environment, incorrect location or orientation, or dirty pipelines. Therefore, when installing and using electric control valves, the following points should be taken into consideration: ① Control valves are field instruments, and the ambient temperature should be within the range of -25°C to 60°C, with a relative humidity of less than 95%. If it is installed in an outdoor or high-temperature environment, waterproofing and cooling measures should be taken. In areas where earthquakes occur, one should stay away from the epicenter or take additional seismic protection measures. ② Control valves should generally be installed vertically; in special cases, they can be installed at an angle. If the angle is very large or if the valve’s own weight is too great, support structures should be added to protect the valve. ③ Pipelines equipped with control valves should generally not be placed too high above the ground or floor. When the pipeline height exceeds 2 meters, a platform should be provided as much as possible to facilitate the operation of the handwheel and ease maintenance. ④ Before installing the control valve, the pipeline should be cleaned to remove dirt and slag. After installation, to ensure that no impurities remain inside the valve body, the valve should be cleaned again; that is, all valves should be opened when the medium is introduced, to prevent impurities from getting stuck. After using the handwheel mechanism, it should be returned to its original neutral position. ⑤ To ensure that the production process can continue in the event of a failure or maintenance of the control valve, a bypass line should be provided for it. Special attention should also be paid to whether the installation location of the control valve meets the requirements of the process. ⑥ The installation of the electrical components of electric control valves shall be carried out in accordance with the relevant construction requirements for electrical equipment. In the case of flameproof products, they shall be installed in accordance with the requirements of the \"Code for Installation of Electrical Equipment in Explosive Atmospheres\". If the wires on site are of the SBH type or other six-core or eight-core rubber-insulated cables with an outer diameter of around Φ11.3 mm. During maintenance, it is strictly prohibited to power on and open the cover in explosive environments, as well as to pry at the flameproof surface. At the same time, avoid damaging or scratching the flameproof surface during disassembly and assembly, and restore it to its original flameproof condition after maintenance. ⑦ After disassembling and repairing the reducer of the actuator, attention should be paid to lubrication by adding oil; low-speed motors generally should not be disassembled, cleaned, or lubricated. After assembly, it is also necessary to check whether the valve position matches the indication of the valve opening degree. ⑧ The performance of the control valve directly affects the quality of operation of the entire control system. Since control valves are in direct contact with the medium being regulated on-site and operate in extremely harsh conditions, they are prone to various types of failures. During the production process, in addition to promptly resolving these faults, regular maintenance and periodic inspections are also necessary. Especially for control valves used in particularly harsh environments, greater attention should be paid to maintenance and regular inspections. ⑨ Proper use and maintenance of electric control valves not only enhances the reliability of process control but also extends their service life, bringing significant economic benefits to companies in terms of energy savings and cost reduction. Standby operating conditions and platform construction.