routine inspection

• Visual inspection
  • Inspection contentCheck if there are any leaks at the connection parts such as valve body, valve cover, flange, etc., such as medium leakage, gas escape, etc; Check the surface of the valve body for corrosion, cracks, deformation, and other damages; Observe whether the outer shell of the actuator is damaged and whether the connecting parts are loose.
  • inspection frequencyIt is recommended to conduct a visual inspection once a day to promptly identify potential issues.
• Running status check
  • Inspection contentPay attention to whether there are any abnormal vibrations or noises during the operation of the valve, which may indicate problems such as jamming, loosening, or imbalance inside the valve; Observe whether the valve action is flexible, whether the opening indication is accurate, and whether it is consistent with the display of the control system.
  • inspection frequencyDuring the operation of the valve, its operating status should be regularly observed, and a simple inspection can be conducted every hour or every shift.
• Temperature and pressure inspection
  • Inspection contentUse appropriate thermometers and pressure gauges to measure the surface temperature of the valve body and the inlet and outlet pressures, and determine if they are within the normal range. If the temperature is too high, it may be due to the medium flow rate being too fast, friction or blockage inside the valve, etc; Abnormal pressure may indicate improper valve selection, pipeline blockage, or valve failure.
  • inspection frequencyRegularly (such as daily or weekly) conduct temperature and pressure checks based on process requirements and medium characteristics.

regular maintenance

• Cleaning and descaling
  • Maintenance contentFor single seat valves with impurities and easy scaling in the medium, regular cleaning should be carried out. Disassemble the valve and soak the valve core, seat, valve body and other components in a suitable cleaning agent to remove surface dirt, rust and deposits. After cleaning, rinse with clean water and air dry.
  • maintenance cycleThe cleaning cycle depends on the characteristics of the medium and the usage environment, usually every 3-6 months. For media with severe scaling, it may be necessary to shorten the cleaning cycle.
• Seal inspection and replacement
  • Maintenance contentCheck the sealing surface between the valve core and valve seat for wear, scratches, or corrosion. If there is slight wear, it can be repaired by grinding; Check whether the packing at the stuffing box is aging, damaged, or leaking. If the packing loses elasticity or leaks, it should be replaced with a new packing in a timely manner.
  • maintenance cycleThe inspection cycle for seals is generally once every 6-12 months. Depending on actual usage, if leaks or other abnormalities are found, they should be dealt with promptly. The replacement cycle of the packing depends on the material and usage conditions, usually every 1-2 years.
• Execution Agency Maintenance
  • Electric actuatorCheck the operation of the motor, including whether the motor temperature, sound are normal, and whether there is any odor; Check the lubrication condition of the reducer and regularly add or replace lubricating oil; Check whether the limit devices such as travel switches and torque switches are sensitive and reliable.
  • Pneumatic actuatorCheck if the air source pressure is stable and within the specified range; Check the sealing performance of the cylinder and whether there is any air leakage; Check the working status of pneumatic components such as solenoid valves and positioners, and repair or replace them promptly if there are any faults.
  • maintenance cycleThe maintenance cycle of the executing agency is generally to conduct a comprehensive inspection and maintenance every 3-6 months.
• Lubrication maintenance
  • Maintenance contentLubricate the moving parts of the valve, such as the valve stem and bearings. Choose the appropriate lubricant, such as grease or oil, and lubricate according to the specified lubrication cycle and amount. Lubrication can reduce friction between components, decrease wear, and extend the service life of valves.
  • maintenance cycleThe lubrication cycle depends on the frequency of use and environmental conditions of the valve, usually once every 1-3 months. For valves in high temperature, high load, or harsh environments, the lubrication cycle should be appropriately shortened.

Stop maintenance

• Emptying and drying
  • Maintenance contentIf the valve is not in use for a long time, the medium inside the valve body should be emptied to prevent the medium from crystallizing, precipitating, or corroding the valve components inside the valve body. For valves that are prone to moisture, desiccants or dry air can be used for drying treatment to keep the inside of the valve body dry.
  • Maintenance methodsOpen the drain valve at the bottom of the valve to empty the medium; Place the desiccant inside the valve body or introduce dry air and maintain it for a certain period of time.
• Protective treatment
  • Maintenance contentApply a layer of protective coating on the surface of the valve to prevent rusting and corrosion of the valve body; For the actuator, dust and moisture prevention measures should be taken, such as wrapping it with plastic film or placing it in a dry environment.
  • Maintenance methodsChoose the appropriate protective coating and apply it according to the instructions for use of the coating; For the actuator, a dust cover can be used or placed in a dedicated protective box.

Maintain records and archive management

• Record contentDetailed records should be kept of the time, content, discovered problems and their solutions, and replaced parts of each maintenance and upkeep. At the same time, record the operating parameters of the valve, such as opening, flow rate, pressure, temperature, etc., in order to analyze the performance trend of the valve.
• Archives ManagementEstablish maintenance records for single seat valves and organize and archive the maintenance records. By analyzing maintenance records, it is possible to summarize the fault patterns of valves, develop reasonable maintenance plans, and improve maintenance efficiency and quality.