Rotork Executive AgencyAs the core equipment for industrial valve control, its operational stability directly affects the safety and efficiency of the production process. Scientific daily maintenance can effectively reduce the occurrence rate of failures and extend the service life of equipment. This guide outlines the core maintenance points and is applicable to the maintenance operations of actuators under normal working conditions.
1、 Preparation before maintenance
safety protectionBefore maintenance, the power supply and control signal source of the actuator must be cut off, and a "No Operation" warning sign must be hung; Wear insulated gloves and non slip shoes. If high-altitude operations are involved, fasten the safety belt to ensure that the working environment is free of flammable and explosive media.
Tools and spare partsPrepare torque wrenches, screwdrivers, pressure gauges, lubricating oil (according to the specified model in the equipment manual, if food grade working conditions require corresponding certified oil), gaskets and other tool spare parts, and check in advance the compatibility between the spare part model and the equipment.
Data verificationRetrieve equipment files, confirm the actuator model, operating years, historical fault records, and last maintenance time, with a focus on special maintenance requirements under special operating conditions (such as high temperature, high humidity, and corrosive environments).
2、 Core maintenance process
1. Appearance and mechanical component inspection
Check whether the actuator housing and junction box are damaged or corroded, and whether the sealing components are aged or deformed. If there are signs of rainwater leakage, replace the sealing gasket in a timely manner and carry out waterproof treatment.
Manually rotate the actuator handwheel to feel whether the running resistance is uniform, without any jamming or abnormal noise; Check the coupling at the connection between the output shaft and the valve to ensure that the bolts are tightened, free from looseness or wear.
Check the oil level of the reducer and observe whether the oil is within the specified range through the oil gauge. The oil quality should be clear, without turbidity or impurities. If the oil level is insufficient, timely supplement the same type of lubricating oil. If the oil quality deteriorates, replace it completely.
2. Electrical system inspection
Open the junction box and check if the wiring terminals are loose or oxidized, if the insulation layer of the wires is damaged, and focus on inspecting the connection points of the power supply and control signal wires. If the oxidation layer is found, it needs to be polished with fine sandpaper and re tightened.
To test the insulation performance of the motor, use a megohmmeter to measure the insulation resistance between the motor winding and the housing. At room temperature, the resistance should not be less than 5M Ω. If the resistance is too low, check for moisture or damage to the winding.
Check the reliability of the action of the limit switch and torque switch, manually operate the valve to the fully open and fully closed positions, confirm that the switch can be accurately triggered, and the feedback signal is transmitted to the control system normally.
3. Calibration of control and feedback systems
Connect the control power supply (temporarily not connected to the power supply), issue on/off commands through the control system, and check whether the response speed of the actuator is normal, whether there is any instruction delay or misoperation.
Calibrate the position feedback signal, operate the actuator to 50% opening, use a multimeter to measure the feedback signal (such as 4-20mA current signal), ensure that the actual opening is within ± 1% of the feedback value error, and adjust it through the equipment calibration knob when it exceeds the tolerance.
Test the manual/automatic switching function, which should be smooth and without any lag during the switching process, and the control system should be able to accurately recognize the operating mode after switching.
4. Cleaning and lubrication
Wipe the equipment casing and observation window with a dry cloth to remove surface dust accumulation; For areas with more oil stains, neutral cleaning agents can be used to wipe and air dry to prevent moisture from seeping into the interior of the equipment.
Add lubricating oil to the transmission gears, bearings, and other moving parts of the actuator, with a suitable amount of oil to overflow a small amount of new oil; For the exposed output shaft seal, a small amount of lubricating grease can be applied to enhance the sealing performance.
3、 Common problem handling and recording
1. Typical small fault handling
If there is a "manual operation stuck", it is mostly due to insufficient lubrication or foreign object blockage, and the foreign object needs to be cleaned and re lubricated; If it is gear wear, it needs to be recorded and professional personnel should be contacted for repair.
If the feedback signal is abnormal, first check whether the wiring is loose, and then use a multimeter to detect the sensor. After confirming the sensor fault, replace it with a spare part of the same model in a timely manner.
2. Maintain records
After each maintenance, a detailed record of the "Rotork Execution Mechanism Maintenance Record Form" should be kept, including maintenance date, operator, equipment number, maintenance items, inspection data, identified problems and handling measures. For unresolved hidden dangers, they should be marked as "to be followed up" and reported.
4、 Maintenance cycle and precautions
Cycle requirementsUnder normal operating conditions, conduct daily visual and operational status inspections, conduct comprehensive maintenance once a month, and perform accuracy calibration once a quarter; Special working conditions such as high temperature, high humidity, and corrosiveness require shortening the maintenance cycle to once every two weeks.
TaboosProhibit maintenance operations during the operation of the executing mechanism; Prohibit the use of non specified lubricating oil and spare parts to avoid damaging the equipment; In low temperature environments during winter, if the equipment is shut down, the accumulated water in the reducer (if any) should be drained to prevent freezing and cracking.
Spare Parts ManagementKey spare parts (such as limit switches, sealing kits, motors) need to be regularly inspected for inventory to ensure that they are in good condition and in sufficient quantity. The storage environment should be dry, ventilated, and dust-proof.