Table 1 Common Fault Handling Methods for Quick-closing Butterfly Valve Hydraulic Drives No. phenomenon Cause Analysis Approach 1 Power light is off 1. Check if the power is normal Input normal power 2 Local operation fails 1. The "Power" indicator is lit 1. Press 1 to process 3 Remote operation failure 1. The "Power" indicator is lit 1. Press 1 to process 4 Pressure gauge shows zero pressure 1. Is the system started 1. Start the system 5 Cylinder does not move 1. Check if the operation is valid 1. Press 2 to process 6 Oil pollution 1. Replace the filter element of the oil or even the filter 7 The motor has been running or has timed out 1. Check the upper limit pressure switch 1. Adjust or replace the pressure relay 8 "Low oil pressure" and the motor does not operate 1. Check the lower limit pressure switch 1. Adjust or replace the pressure relay 9 Poor pressure performance 1. Check if the solenoid valve leaks 1. Repair or replace solenoid ball valve 10 Unsteady cylinder 1. Check whether the hydraulic lock leaks 1. Repair or replace hydraulic lock Mini Dry Claw vacuum pump,Lab Vacuum Pump,Claw Vacuum Pump,Screw Vacuum Pump Shandong Newels International Co., Ltd , https://www.newelsindustrial.com
2. Check if the circuit breaker in the electric control box is closed
3. Check if the switching power supply in the electric control box is normal
4. Check if the fuse on the circuit board is blown
2. Close the circuit breaker
3. Replace the switching power supply
4. Replace the fuse
2. Is the "local/remote" switch toggled to the local gear?
2. Switch to local gear
2. The "local/remote" switch toggles to the remote range
2. Switch to remote gear
2. Whether the pump motor is running or the motor is overloaded or missing
3. Is the oil drain valve open?
2. Elimination of overload factors (oil pump or shaft stuck), check power supply
3. Close the oil shutoff valve
2. Check if oil pressure is normal
3. Check the solenoid valve coil is normal
4. Check if the solenoid valve is stuck or burned
5. Check if the hydraulic valve is stuck
2. According to 4 items
3. Configure the live with the correct requirements
4. Disassemble and clean or replace
5. Disassemble and clean or replace
2. Check the overflow valve
2. Readjust the overflow valve
2. Check the oil pump motor and control circuit
2. Press 4 to process
2. Check whether the throttle valve is closed
3. Check the cylinder for internal leakage
4. Check if the check valve leaks
2. Close the throttle valve
3. Replace the seal of the cylinder
4. Replace the check valve
2. Check the cylinder for internal leakage
2. Change the seal of the cylinder
Problems encountered with quick closing butterfly valve hydraulic devices
1 Overview
The quick closing butterfly valve hydraulic drive can solve the turbine overspeed problem caused by the electric shutoff butterfly valve and check valve failing to close (>1s). When the unit has an accident, the quick-closing butterfly valve hydraulic drive device can quickly drive the valve to close, effectively preventing steam and condensate from pouring backwards in the steam turbine, and instantaneously cutting off the pipeline to protect the turbine. It can be seen that the quick closing butterfly valve hydraulic driving device belongs to the safety equipment device. It is very necessary to ensure its normal operation. The correct maintenance and repair methods are the necessary conditions to ensure the normal operation of the equipment. The following describes the quick closing butterfly valve hydraulic driving device. Maintenance methods and maintenance points.
2ã€Maintenance method
The normal operation of the quick-closing butterfly valve hydraulic drive requires daily maintenance. If you do not pay attention to the daily maintenance and maintenance of the equipment, the quick-acting butterfly valve hydraulic drive device is prone to failure. Operators should always observe the hydraulic system pressure, noise, vibration, oil temperature, oil level, voltage, trip switch and leakage and other issues, and solve the problem once it is found. The proper maintenance method can reduce the failure of the quick closing butterfly valve hydraulic drive device, prolong the service life of the quick closing butterfly valve hydraulic drive device, and quick-close the routine maintenance methods of the butterfly valve hydraulic drive device mainly include the following aspects.
(1) Quick closing butterfly valve After the hydraulic drive device is installed, when filling the tank, be sure to add the oil according to the specifications given in the instructions. If you want to use other oil substitutes, you must confirm with the manufacturer before you can change. The oil must also be filtered before it can enter the tank. The level of contamination of the system oil must be above NAS8.
(2) Quick closing butterfly valve When the hydraulic drive is installed for the first time after installation, it is necessary to check whether the direction of the motor is correct. It can be judged by jogging the motor. If the direction is different from the direction required by the specification, the wiring must be changed. Do not start the motor for a long time until the correct direction of the motor is confirmed, so as not to damage the oil pump.
(3) Quick closing butterfly valve hydraulic drive device Before the initial operation after installation, the relief valve should be completely loosened, and then the pressure should be gradually increased to an appropriate 1MPa increments, and run for 5 minutes at each pressure segment. No abnormalities will be raised until the pressure required by the specification is reached. Faults occurring during the pressure test should be promptly removed. Troubleshooting must be done after pressure relief. If the weld needs to be re-welded, the part must be removed, and the joint can be welded only after clean oil.
(4) Do not adjust the system pressure while the actuator is in motion. Pressure gauges should be checked before pressure regulation, and systems without pressure gauges are not allowed to regulate pressure. After adjusting the pressure, adjust the adjustment screw to prevent loosening. Check the pressure gauge regularly and correctly.
(5) Quick closing butterfly valve hydraulic drive Before the initial operation after installation, the gas pressure in the accumulator should be filled with nitrogen to the pressure required by the instructions, and no oxygen can be used instead. Otherwise, serious accidents will occur. The accumulators are not allowed to pressurize during transportation, which is prone to explosion.
(6) Check the fuel tank level height regularly (one month). The first refueling suggestion is added to the full level gauge. Under normal working conditions, the oil level is required to be at or above 1/2 of the level gauge. If it is lower than 1/3 level of the level gauge, it must be refueled with “low levelâ€. 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 fuel reaches the required scale.
(7) Initially, the gas pressure in the accumulator should be checked periodically (one month). If the filling pressure is lower than 10% of the specification, nitrogen should be added to make the nitrogen pressure reach the pressure required by the instructions. After six months, the gas pressure in the accumulator can be checked in the first quarter.
(8) During the production and operation of the quick-closing butterfly valve hydraulic drive, attention should be paid to changes in the oil quality. Samples should be taken periodically (quarterly). If it is found that the oil quality does not meet the requirements, the purification process or the replacement of the new fluid in a timely manner requires that the system oil contamination level be maintained above NAS8.
(9) Always check the voltage of the power supply of the quick-closing butterfly valve hydraulic drive. The fluctuation range of the power supply voltage is within ±10% of the rated voltage. Pay special attention to the supply voltage of the solenoid valve. The deviation of the supply voltage is within ±10% of the rated voltage to ensure the normal operation of the solenoid valve.
(10) Always inspect the various filters of the hydraulic closing device of the quick closing butterfly valve. When the oil pollution alarm is found, replace the filter element of the filter in time. If the filter element is found to be seriously damaged, the tank fluid must be replaced or filtered.
(1) After the quick-closing butterfly valve hydraulic drive unit is put into operation, it is necessary to always observe the operation of the device locally, and if any abnormality such as fault indication or oil leakage occurs, it shall be handled in time.
(12) According to the design regulations and work requirements, reasonably adjust the working pressure and working speed of the quick closing butterfly valve hydraulic drive device. When the pressure valve and speed control valve are adjusted to the required values, the adjustment screw should be tightened to prevent loosening.
(13) Quick closing butterfly valve hydraulic drive should pay attention to moisture, loosening, corrosion, dust and impact.
(14) Quick closing butterfly valve The hydraulic operating fluid temperature must not exceed 55°C. If the fluid operating temperature exceeds 55°C, the cause must be identified to resolve.
(15) Quick closing butterfly valve The high pressure hoses and seals of the hydraulic drive are to be replaced regularly (generally 2a).
(16) Always check the operation of the pressure relay and limit switch. If it is abnormal, replace it in time.
3, maintenance points
Quick closing butterfly valve hydraulic drive once failure, it is necessary to repair in time, pay attention to the following points in the maintenance.
(1) Quick closing butterfly valve When the hydraulic drive fails, it must be carefully analyzed according to the hydraulic diagram and electrical schematic diagram to find the fault point and determine the maintenance method.
(2) When replacing hydraulic components or pipes or seals, the pressure oil of the accumulator should be drained to prevent fuel injection or injury.
(3) When replacing electrical components, switch off the power supply to avoid electric shock.
(4) If it is necessary to replace the hydraulic components and electrical components, check the model number, identify the storage time and storage environment of the components, and pay attention to the internal aging of the components. If necessary, dismantle, replace, and perform performance tests.
(5) If it is necessary to perform maintenance on the screwed cartridge valve, it is necessary to understand its principle and structure before disassembling. When disassembling, use a suitable opening sleeve to unscrew the three-jaw chuck, and use a suitable opening sleeve for the assembly. The jaw chuck is screwed on, and a thread-removable thread locker is used for the thread at the time of assembly.
(6) If it is necessary to replace the two-way cartridge valve, use special tools when removing the valve sleeve, otherwise it is difficult to disassemble. When assembling the two-way cartridge valve, apply grease, slowly press it with the screws and the cover plate, and do not tap it.
(7) During maintenance, it is necessary to check whether the material and strength of the connecting bolt used in the hydraulic components meet the design requirements and the requirements stipulated by the manufacturer of hydraulic components. The connecting bolts of the hydraulic valves on the valve block are preferably tightened with a dynamometric wrench, and the tightening torque should be in accordance with the provisions of the manufacturer of the hydraulic valve.
(8) If it is necessary to replace the hydraulic pump, when installing the hydraulic pump, it is necessary to ensure the concentricity tolerance between the hydraulic pump and the motor shaft, the tolerance of the parallelism is in compliance with the regulations, or is not greater than the coupling between the pump and the motor. Manufacturer's Recommended Concentricity and Parallelism Requirements. Tighten the inlet and outlet pipes to ensure no leakage.
4 Common Troubleshooting Methods
Quick-closing butterfly valve hydraulic drive common fault treatment method see "Table 1."