CKD Solenoid Valve Preventive Maintenance and Troubleshooting Information CKD Solenoid Valves include precautionary measures taken during installation, preventive measures taken during patrol inspections, and temporary maintenance. Also called planned maintenance, refers to the precautionary measures before the failure, can also be understood as pre-installation and daily maintenance. It mainly consists of two parts:
1) Problems to be paid attention to before installation Cleaning: CKD solenoid valve should be cleaned before installation, and flush the pipeline to remove debris, welding slag and other debris, avoiding garbage from slamming the valve core and preventing high-speed garbage from damaging the valve. Or other equipment. Avoid installation stress: When installing the regulating valve, it often encounters different axes between the two pipe flanges, which is seriously skewed; sometimes the distance between the two flanges and the end face of the valve is too much; the hard-drawn and hard-bent pipes are used with the boring bar. , barely put the valve up, so that the valve will bear stress for a long time, causing different degrees of deformation. Fixed support: large diameter valves have a large weight, such as 41000 sleeve valves,
Such a valve should be supported with a support underneath it, and do not let it hang from the pipe. For horizontally mounted valves, the joint between the valve body and the actuator is usually added to the support frame to avoid the torque and bending moment of the valve.
Avoid vibration: The valve is too close to the power machine such as compressor and pump, and will be forced to vibrate, which may cause resonance, so use vibration isolation between the two. For valves with large differential pressures, high-speed fluid impingement on the valve core can also cause vibration. Therefore, it is necessary to pay attention to the inlet flow rate of the valve, and use the appropriate structure. The inlet section of the valve should have a relatively long straight pipe section, generally 10 times the diameter of the valve, to avoid turbulent flow of the elbow to impact the valve trim.
2) The daily maintenance should be paid attention to when the valve is put into use to ensure that the gas source is clean and the power supply is reliable: the national standard of the regulating valve product has clear regulations on the gas source and the power source. The electric valve must be strictly supplied according to the voltage, phase number, AC DC, grounding, etc., and the wiring is reliable. The air source must be dry and clean, free of oil, water, dust and other corrosive substances, to prevent accelerated aging of the rubber diaphragm in the actuator and the positioner, and to prevent the constant orifice in the positioner from being blocked. The air filter pressure reducer for air supply of pneumatic valve or valve positioner should be used correctly. The oil, dirt and dirt under the filter should be drained in time, and the filter elements should be cleaned regularly. Regular inspection and refueling: After the regulator valve is used, it should be checked regularly, focusing on whether the movement is stable. Whether the connection between the push rod and the valve stem is loose, and there is no leakage at the packing and valve body gasket. A common phenomenon is leakage at the packing. Tighten the packing nut in time. If the oiler is used, refuel regularly. In places where there is acid mist or corrosive gas, the exposed valve stem is protected by a plastic tube or a rubber bellows. If the protective sleeve is found to be broken, it shall be replaced in time. Appropriate protective measures are added in particularly harsh environments: although the regulating valve is made of steel, it is also quickly damaged in harsh environments such as sun exposure, flying sand, and snow and wind. These conditions are often not thought of before, and are increased after use. Simple protective equipment, sunshade and rain, can be used to extend the service life of the valve.
2, CKD solenoid valve fault repair When the valve fails, the performance of the regulating valve can not meet the requirements of the self-control requirements. If the safety valve has a problem with the safety performance, or it cannot operate normally and cannot meet the requirements of the automatic control system, it indicates that the fault has occurred and must be repaired. Periodic overhauls in chemical plants and power plants are also included in this type of maintenance.
After the CKD solenoid valve line is relieved and cooled, the valve must be cleaned after removing the valve.
CKD solenoid valve is generally medium-washed with water or steam, soaked. Acid, alkali, radioactive, or other toxic and corrosive media are treated with special techniques to avoid affecting human health and preventing environmental pollution. Disassemble the valve: first disassemble the actuator and the valve, hang the label before disassembling, and mark the connection. Then remove the upper bonnet from the valve body and mark it at the joint of the middle flange. Remove the valve plug-stem stem, sleeve, body gasket, studs in the valve body; unscrew the seat, seat gasket (if any). Remove the packing flange, gland, hook out packing, gasket, etc. from the upper bonnet; first clean after cleaning, focus on the following parts: valve body, damage to the inner wall; valve core, valve seat, section The degree of damage of the flow surface, whether it can be repaired; whether the valve stem, the thread connected to the valve plug is loose, whether the valve stem is bent, deformed or worn; whether the filler is deformed or aged, it is generally not reused; the valve body gasket and valve Seat gaskets are generally not reused.
CKD solenoid valve dismounting actuator: Remove the bolt around the pneumatic diaphragm head, take out the diaphragm, spring-push rod part, and take out the O-ring in the bracket.
CKD solenoid valve diaphragm, check for aging, crack, mesh degumming; spring, check the surface corrosion degree, cracks, deformation; O-ring, aging, wear, break; push rod with or without deformation, corrosion For example, if the piston type actuator is used, check whether the inner wall of the cylinder is worn, whether the hair is pulled, whether the piston ring and the guide are aged and worn, whether the piston and the piston rod are deformed and worn. Reassembly: After the above inspection, the parts can be repaired and replaced. assembly. Then connect the two parts to the whole machine. When assembling, care should be taken to add grease.
The auxiliary valve such as the valve positioner and air filter reducer is installed and installed in the original position after being repaired and tested. Performance test: The assembled control valve is tested and tested according to the factory items, such as air tightness, tightness, compressive strength, leakage, basic error, hysteresis, dead zone, rated stroke, and constant point deviation.
The rated flow and flow characteristics test is added for special needs. Commonly used spare parts, usually before the accident repair, usually prepare the following consumables: valve body parts, packing, valve body gasket, seat gasket, double stud, safety pin, etc.; pneumatic actuator components, O-ring rubber ring , piston ring, membrane cover bolts; according to a certain percentage of the number of actuators in the same specification, prepare diaphragms and springs.
Disassembly actuator: Remove the bolt around the pneumatic diaphragm head, take out the diaphragm, spring-push rod part, and take out the O-ring in the bracket. Clean and check carefully. (diaphragm, check for aging, crack, mesh degumming; spring, check the surface corrosion degree, cracks, deformation; O-ring, aging, wear, break; push rod with or without deformation, rust; Piston actuator, check the inner wall of the cylinder for wear, pull, piston ring and guides for aging and wear, piston and piston rod deformation, wear) Reassembly: After the above inspection, the parts can be reassembled after repairing and changing.
Then connect the two parts to the whole machine. When assembling, care should be taken to add grease.
The auxiliary valve such as the valve positioner and air filter reducer is installed and installed in the original position after being repaired and tested. Performance test: The assembled control valve is tested and tested according to the factory items, such as air tightness, tightness, compressive strength, leakage, basic error, hysteresis, dead zone, rated stroke, and constant point deviation. The rated flow and flow characteristics test is added for special needs. Commonly used spare parts, usually before the accident repair, usually prepare the following consumables: valve body parts, packing, valve body gasket, seat gasket, double stud, safety pin, etc.; pneumatic actuator components, O-ring rubber ring , piston ring, membrane cover bolts; according to a certain percentage of the number of actuators in the same specification, prepare diaphragms and springs.

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