In industrial production and daily life, the safe and efficient operation of valves plays a decisive role in the entire fluid delivery system. In order to achieve this goal, a complete set of valve daily maintenance guidelines is essential.
First, check the operating flexibility of the valve regularly. The valve should be able to open and close easily under the specified torque or driving force, without obvious sticking phenomenon. For manual valves, the operator can regularly turn the hand wheel to feel whether the operating force is uniform and whether the stroke is smooth. If it is found that the handwheel is difficult to rotate, it may be caused by excessive friction between the valve stem and the stuffing box, impurities blocked in the valve body, or damage to the valve transmission parts. At this time, you should further check and take appropriate measures, such as adding grease, cleaning impurities in the valve body or repairing the transmission parts. For the electric valve, it is necessary to check whether the running sound of the motor is normal, whether the reducer has oil leakage, and whether the opening indication of the valve is consistent with the actual opening. Regular stroke calibration and torque testing of the electric valve ensure that it can accurately execute the switching command in the automatic control system.
Second, pay attention to the valve anticorrosion treatment. Many valves are installed in humid, corrosive environments, such as chemical workshops, seaside facilities, etc. In order to prevent the valve body and valve stem from being corroded, in addition to the valve made of corrosion-resistant materials when selecting the valve, the anti-corrosion coating should also be checked and maintained regularly in the daily maintenance of the valve. If the coating is found to be damaged or peeling, it should be repaired in time. You can first clean the valve surface, remove rust and dirt, and then according to the requirements of the anticorrosive coating construction process, re-paint or other anticorrosive materials. For some valves that are immersed in corrosive media for a long time, special anti-corrosion measures such as cathodic protection can also be considered to enhance the corrosion resistance of the valve.
Third, pay attention to the internal leakage and external leakage of the valve. Internal leakage means that when the valve is closed, there is still medium leakage between the valve disc and the seat; External leakage refers to the leakage of media from the valve body, stem seal or other connection parts into the external environment. Internal leakage may cause problems such as unstable system pressure and media waste, while external leakage may cause serious consequences such as environmental pollution and safety accidents. Therefore, it is necessary to regularly use testing instruments, such as ultrasonic flowmeters, pressure gauges, etc., to detect the leakage of the valve. For valves with small internal leakage, you can try to solve the problem by adjusting the sealing force between the disc and the seat, such as properly tightening the valve gland nut or adjusting the sealing torque setting value of the electric valve. For valves with serious internal leakage or external leakage, it is necessary to disassemble and repair the valve, check whether the sealing surface of the valve disc and the seat is damaged, and if there is damage, it should be repaired by grinding or replacing the seal.
Fourth, do a good job of valve maintenance records and file management. Every valve inspection, maintenance, repair and other operations should be recorded in detail, including the operation date, operator, inspection content, found problems, measures taken and maintenance after the operation of the information. Through the establishment of a sound valve maintenance file, the operating status of the valve can be tracked and analyzed, and the potential failure of the valve can be found in time, which provides a basis for the formulation of reasonable maintenance plans and replacement strategies. At the same time, maintenance records are also a means of supervision and assessment of the quality of valve maintenance work, which helps to improve the responsibility and professional level of maintenance personnel.
Finally, strengthen the training and technical support for valve maintenance personnel. There are many kinds of valves and complex structures, and different types of valves have differences in maintenance methods and technical requirements. Therefore, it is necessary to regularly organize maintenance personnel to participate in professional training, so that they are familiar with the working principle of various valves, structural characteristics, maintenance points and common troubleshooting methods. At the same time, it is necessary to provide the necessary technical information, tools and equipment and technical consulting services for the maintenance personnel to ensure that they can timely and effectively solve the various problems of the valve in the daily maintenance work.
Following the above daily maintenance guidelines for valves can effectively ensure the safe and efficient operation of valves in industry and life, reduce production interruptions, safety accidents and economic losses caused by valve failures, and provide a solid guarantee for the stable operation of fluid conveying systems.
The importance and practical method of valve maintenance
