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Close the butterfly valve hydraulic drive maintenance and repair
Abstract: This article introduces the maintenance methods and maintenance points of the hydraulic drive device of fast closing butterfly valve. Key words: quick closing butterfly valve; hydraulic actuator; maintenance; maintenance 1 Overview Quick-closing butterfly valve hydraulic drive device can solve the electric cut-off butterfly valve and check valve can not be off (> 1s) caused by the turbine speeding problem. When the unit accident, the fast closing butterfly valve hydraulic drive device can quickly drive the valve closed, effectively prevent steam turbine tail steam and condensate back into the water, instantly cut off the pipeline to protect the steam turbine. It can be seen that the fast closing butterfly valve hydraulic drive device is a safety device, to ensure its normal operation is very necessary, the correct method of maintenance and repair equipment to ensure the normal operation of the necessary conditions, the following describes the quick closing butterfly valve hydraulic drive Maintenance methods and maintenance points. 2 Maintenance methods Quick close the butterfly valve hydraulic drive normal operation requires routine maintenance, if you do not pay attention to the routine maintenance of equipment, quick closing butterfly valve hydraulic drive prone to failure. The operator should always observe the hydraulic system pressure, noise, vibration, oil temperature, oil level, voltage, travel switches and leaks and other issues, if problems are found to be promptly resolved. Suitable maintenance methods can reduce the failure of the quick-closing butterfly valve hydraulic drive, prolong the service life of the quick-closing butterfly valve hydraulic drive, and the daily maintenance of the quick-closing butterfly valve hydraulic drive mainly includes the following aspects. (1) fast closing butterfly valve hydraulic drive installation is complete, when filling the tank, be sure to follow the instructions given by the brand refueling, if you want to use other oil substitute must be confirmed by the manufacturer before they can be changed, the new Of the oil products have to go through the filter to enter the tank, requiring the system oil level of pollution reached NAS8 above. (2) Close the butterfly valve hydraulic drive installed in the first run after the completion of the operation, to confirm the direction of the motor is correct. It can be judged by jogging the motor. If the direction is inconsistent with the direction required by the manual, the wiring should be changed. Do not turn on the motor for a long time before confirming the correct motor direction to avoid damage to the pump. (3) fast closing butterfly valve hydraulic drive installed in the first run after the completion of the operation, the relief valve should be completely loosen, and then slowly increase the pressure to 1MPa increments and run in each pressure section 5min, confirm No abnormalities and then to increase until the instructions to meet the pressure requirements. Pressure test during the failure should be promptly ruled out. Troubleshooting must be done after relief. If the weld seam needs to be re-welded, the piece must be removed, except after the net oil can be welded. (4) Do not adjust the system pressure while the actuator is in motion. Before the pressure regulator should check the pressure gauge, no pressure gauge system is not allowed to pressure. After adjusting the pressure adjusting screw should be locked to prevent loosening. To regularly check the pressure gauge is correct and reliable. (5) Quick Close Butterfly Valve Hydraulic Drive Before the first operation after the installation is completed, it is necessary to fill the gas pressure in the accumulator with nitrogen to the pressure required by the instructions. Do not use oxygen instead. Otherwise, serious accidents will result. Equipment in the transport process does not allow accumulator pressure, so easy to explode. (6) Check the tank level regularly (one month). The first refueling proposal is added to the full level gauge, under normal working conditions, the oil level requirements in the level gauge above the height of 1/2, below the level of 1/3 the height must be refueling, with "low level" When controlling the protection, the oil source system will stop working when the liquid level is too low, and the system will not restart until the fueling reaches the required scale. (7) The gas pressure in the accumulator should be inspected periodically (one month) at the beginning. When the pressure is less than 10% of the inflation pressure, nitrogen should be added to make the nitrogen pressure reach the pressure required in the instructions. Six months later, check the gas pressure in the accumulator in the first quarter. (8) In the process of production and operation of the hydraulic drive device of fast closing butterfly valve, attention should be paid to the changes of the oil quality. Sampling tests should be conducted regularly (every quarter). If you find the oil does not meet the requirements, timely purification or replacement of new oil, the system requires the degree of pollution of the oil to maintain NAS8 above. (9) often check the fast closing butterfly valve hydraulic drive power supply voltage, power supply voltage fluctuation range of ± 10% of the rated voltage. Pay special attention to the supply voltage of the solenoid valve, the power supply voltage deviation within ± 10% of the rated voltage to ensure that the solenoid valve can operate normally. (10) often check the fast-closing butterfly valve hydraulic drive each filter. Found oil pollution alarm, timely replacement of the filter cartridge. If found serious damage to the filter, you must replace or filter tank fluid. (1.) After the hydraulic actuator of the quick closing butterfly valve is put into operation, it is necessary to regularly observe the operation of the device locally. If any fault indication, oil leakage and other abnormalities occur, it shall be disposed promptly. (12) According to the design requirements and work requirements, reasonably adjust the working pressure and working speed of the hydraulic drive device of the quick-closing butterfly valve. Pressure valve, speed control valve transferred to the required value, the adjustment screw should be tightened to prevent loosening. (13) Close the butterfly valve hydraulic drive device should pay attention to moisture, anti-loose, anti-corrosion, dust and crash and so on. (14) Close the butterfly valve hydraulic drive oil working temperature shall not exceed 55 ℃, if the oil temperature exceeds 55 ℃ must find out the reasons to be resolved. (15) Close the butterfly valve hydraulic drive high-pressure hose and seals to be replaced regularly (usually 2a). (16) often check the pressure relay and travel switch action is normal, if not normal to be replaced. 3 Maintenance Points Fast-closing butterfly valve hydraulic drive in the event of failure, timely repair, maintenance should pay attention to the following points. (1) fast closing butterfly valve hydraulic drive failure should be based on the hydraulic schematic and electrical schematic diagram carefully analyzed to identify the point of failure, to determine the method of maintenance. (2) When replacing the hydraulic components or piping or seals, the accumulator pressure oil should be drained to avoid fuel injection or wounding accident. (3) The electrical components should be replaced, you should turn off the power, so as to avoid electric shock accidents. (4) If it is necessary to replace the hydraulic components and electrical components, check the model number, identify the component storage time and custody of the environment, should pay attention to the degree of aging inside the components, if necessary, washable, replace and conduct performance tests. (5) If it is necessary to repair the screw-in cartridge valve, understand the principle and structure before disassembly. When disassembling, use a suitable opening sleeve to unscrew on the three-jaw chuck. When assembling, also use the appropriate opening sleeve in three Tweezers claw chuck, the thread assembly at the assembly but also the use of removable thread locking agent. (6) If you need to replace the two-way cartridge valve, remove the valve sleeve to use special tools, or difficult to disassemble. In the assembly of two-way cartridge valve, to be coated with lubricating oil, slowly press in with screws and cover, do not knock into. (7) When repairing, check whether the material and strength of connecting bolts used in hydraulic components meet the design requirements and the requirements specified by the manufacturer of hydraulic components. Valve block on the hydraulic valve connecting bolt is best to use force wrench tightening, tightening torque should be consistent with the provisions of the hydraulic valve manufacturer. (8) If you need to replace the hydraulic pump, when installing the hydraulic pump, to ensure that the concentricity between the hydraulic pump and the motor shaft tolerance, parallelism tolerance in line with the provisions of, or not greater than the coupling between the pump and the motor Manufacturers recommend concentricity and parallelism requirements. Tighten the inlet and outlet tubing to ensure no leaks. 4 common troubleshooting approach Fast-closing butterfly valve hydraulic drive common fault handling method see "Table 1". "Table 1" Quick Close Butterfly Valve hydraulic drive common troubleshooting approach No. Phenomenon Causes Analysis and Treatment Method 1 Power indicator does not light 1. Check the power supply is normal 2. Check the electric control box circuit breaker is closed 3. Check the electric control box Internal switch power supply is normal 4. Check the fuse on the circuit board is blown 1. Input normal power 2. Close the circuit breaker 3. Change the switch power supply 4. Replace the fuse 2 local operation failure 1. "Power" light is lit 2 . "Local / Remote" switch is pulled to the local gear 1. Press 1 processing 2. Switch to the local gear 3 Remote operation failure 1. "Power" light is lit 2. "Local / Remote" switch Whether to pull the remote gear 1. Press 1 to handle 2. Switch to the remote gear 4 Pressure gauge shows zero pressure 1. Whether the system starts 2. Whether the pump motor is running, the motor is overloaded or out of phase 3. Whether the oil shut-off valve is Open 1. Start the system 2. Eliminate overload factors (pump or shaft is stuck), check the power supply 3. Close the drain valve 5 cylinder does not move 1. Check the operation is valid 2. Check the hydraulic pressure is normal 3. Check the solenoid valve line Get electricity is normal 4. Check the solenoid valve is stuck or burned 5. Check the hydraulic valve is stuck 1. By 2 treatment 2. By 4 treatment 3. According to the correct configuration of charged 4. Remove and clean or Replacement 5. Disassembly and cleaning or replacement 6 Contamination by oil 1. Replacing the filter element of the fluid or even the filter 7 Motor always running or overtime 1. Check the high pressure limit switch 2. Check the pressure relief valve 1. Adjust or replace the pressure relay 2 .Re-adjust the relief valve 8 "low oil pressure" and the motor does not run 1.Check the lower limit pressure switch 2.Check the pump motor and control circuit 1.Adjust or replace the pressure relay 2.Process according to 4 9 poor packing performance 1 Check Leakage of Electromagnetic Ball Valve Check for Shutdown of Shut-off Valve Check Leakage of Leakage Cylinder Check Leakage of Check Valve Repair or Replace Electromagnetic Ball Valve Close Throttle Shut-off Valve Replace Cylinder Seal 4. Replace the check valve 10 Cylinder instability 1. Check the hydraulic lock is leaking 2. Check the cylinder for internal leakage 1. Repair or replace the hydraulic lock 2. Replace the cylinder seal 5 Conclusion Quick switch butterfly valve hydraulic drive Belong to safety equipment, understand Maintenance and repair points method is necessary, for the maintenance of this paper, the actual method of quick closing valve hydraulic drive system and maintenance points are summarized, hoping to be helpful to everyone. Valve Address: Valve Gate Valve Globe Valve Hydraulic Control Valve Butterfly Valve Check Valve Plug Valve Regulator Trap Reducer Filter 1 Power indicator does not light 1. Check the power supply is normal 2. Check the electrical control box circuit breaker is closed 3. Check the power switch in the electrical box is normal 4. Check the fuse on the circuit board is blown 1. Input normal power 2. Close the circuit breaker 3. Change the switch power supply 4. Replace the fuse 2 Local operation failure 1. "Power" Indicator is lit 2. "Local / Remote" switch is pulled to the local gear 1. Press 1 to handle 2. Switch to local gear 3 Remote operation failure 1. "Power" light is lit 2. " Local / Remote "switch is pulled to the remote gear 1. Press 1 processing 2. Switch to the remote gear 4 pressure gauge shows the pressure is zero 1. The system is started 2. Pump motor is running, the motor is overloaded or out of phase 3 Oil drain valve is open 1. Start the system 2. Eliminate overload (pump or shaft is stuck), check the power supply 3. Close the oil drain valve 5 cylinder does not move 1. Check the operation is valid 2. Check whether the hydraulic pressure Normal 3. Check Solenoid valve coil power is normal 4. Check the solenoid valve is stuck or burned 5. Check the hydraulic valve is stuck 1. Press 2 processing 2. By 4 processing 3. According to the correct configuration charged 4. Remove and Clean or replace 5. Disassemble and clean or replace 6 Fluid contamination 1. Change the oil or even the filter cartridge 7 The motor is running or overtime 1. Check the upper limit pressure switch 2. Check the pressure relief valve 1. Adjust or replace Pressure relay 2. Readjust the relief valve 8 "Low oil pressure" and the motor does not run 1. Check the lower pressure limit switch 2. Check the pump motor and control circuit 1. Adjust or replace the pressure relay 2. Press 4 treatments 9 Packing pressure Poor performance 1. Check the solenoid valve is leaking 2. Check the throttle valve is closed 3. Check the cylinder for internal leakage 4. Check the one-way valve is leaked 1. Repair or replace the solenoid valve 2. Close the throttling shut-off valve 3. Replacing the Cylinder Seal 4. Replacing the Check Valve 10 Stalling the Cylinder 1. Check for Hydraulic Leaks Leakage 2. Check Cylinder for Internal Leakage 1. Repair or Replace Hydraulic Lock 2. Replace Cylinder Seal