Valve as an important part of fluid control system, its service life directly affects the operating cost and reliability of the whole system. The correct daily maintenance method is the secret of extending the service life of the valve, the following will be detailed about the various points of valve maintenance.
First of all, cleaning work is the first step of valve maintenance. Valve in the long-term operation process, will absorb dust, oil and other impurities, these dirt will not only affect the appearance of the valve, more likely to lead to valve operation failure or sealing performance decline. Therefore, the outside of the valve should be cleaned regularly with clean rags, brushes and other tools to remove surface dirt. For the inside of the valve, if conditions permit, the valve can be opened for internal cleaning after the valve is closed and the medium is drained. For example, for valves in water pipes, you can use clean water to flush the inside to remove scale and impurities that may exist. For some valves with special media, such as the valve on the chemical pipeline, it is necessary to choose the appropriate cleaning solvent according to the nature of the medium for cleaning, to ensure that the cleaning process will not cause damage to the valve.
The packing box of the valve is one of the parts prone to problems. The function of the stuffing box is to prevent the medium from leaking from the valve stem, and the stuffing is usually made of graphite, asbestos and other materials. Over time, the packing will gradually wear and age, leading to a decline in sealing performance. Therefore, it is necessary to check the sealing condition of the stuffing box regularly. If a slight leak is found, the sealing pressure of the stuffing can be increased by properly tightening the stuffing gland. But be careful not to over-tighten, so as not to damage the valve stem. If the packing has been severely worn or aged, it needs to be replaced. When replacing the filler, clean up the old filler, and then fill the new filler into the stuffing box one by one in accordance with the correct method, and the incision of each ring of the filler should be staggered at a certain Angle, and then evenly tighten the filler cap after filling.
Valve connection parts, such as flange connections, threaded connections, etc., also need regular inspection and maintenance. Check whether the connection bolts are loose. If they are loose, tighten them in time to ensure the tightness of the connection. For flanged valves, it is also necessary to check whether the flange gasket is intact and whether there is aging, deformation or damage. If there is a problem with the gasket, it should be replaced in time, and the appropriate gasket material and specification should be selected during replacement. During installation, ensure that the gasket is placed smoothly and the bolts are tightened evenly.
The influence of temperature and pressure on the valve cannot be ignored. For valves working in high temperature or high pressure environments, it is necessary to regularly check the strength and deformation of the valve body, valve cover and other components. Non-destructive testing technology can be used, such as ultrasonic testing, magnetic particle testing, etc., to detect the key parts of the valve and timely find possible cracks, defects and other problems. At the same time, it is necessary to adjust the operating parameters of the valve reasonably according to the working temperature and pressure of the valve, so as to avoid the valve running under the condition of overtemperature and overpressure, so as to extend the service life of the valve.
In the daily maintenance process of the valve, the professional quality and responsibility of the operator are also crucial. Operators should be familiar with the structure, performance and operation methods of the valve, in strict accordance with the operating procedures for valve operation and maintenance. At the same time, it is necessary to strengthen the training and assessment of operators, improve their business level and safety awareness, and ensure the quality and effect of valve maintenance work.
In summary, by doing a good job of valve cleaning, stuffing box maintenance, connection part inspection, attention to the impact of temperature and pressure and improve the quality of operators and other aspects of maintenance work, can effectively extend the service life of the valve, reduce the maintenance cost of the fluid system, improve the overall operating efficiency of the system.
