Valve maintenance There are two kinds of pre-preventive maintenance and fault repair. Preventive maintenance is mainly in the control valve has not yet failed, under the circumstances of its preventive maintenance on a timely manner, its purpose is to take preventive measures, people usually based on the operation of the control valve to develop the corresponding fault Preventive measures, as the failure did not occur on the maintenance, can greatly reduce the probability of failure; failure of maintenance, also known as passive maintenance, when the control valve fails when a maintenance method, because of equipment failure Maintenance, often causing the production process parking. Preventive maintenance is the maintenance of the control valve during the installation and use of the past operating experience, can be understood as routine maintenance, usually include: eliminate, inspection, removal, overhaul and so on a few jobs. Stress Relief: Pipelines generate a variety of stresses due to improper assembly or installation. These stresses act on the regulator and its lines and can easily affect the performance of the regulator valve. In severe cases, it can affect the regulator system itself, causing the stem and guide Pieces of deformation and can not be aligned with the center valve; for the split valve body valve, valve body flange may cause disengagement; stress may also cause valve seat leakage and so on. Inspection of safe operation: The control valve and related accessories used in explosive hazardous area should be checked for safety operation, such as tightening of seal cover, operation of barrier, power supply, etc., to ensure safety of control valve and related accessories run. Check the support situation: the best place to install the control valve is the valve stem stroke direction and the actuator above the body in a vertical plane. If the control valve must be installed in a position where the valve stem moves horizontally or the valve stem moves in a certain inclination to the horizontal plane, the actuator should be supported so that the various parts of the control valve are in a natural state. If you do not add support or improper support improper installation may cause valve stem and valve seat of the different heart, easily lead to poor change or filler leakage and other failures. To remove or prevent foreign matter from entering: Always check whether there is rust, welding slag, dirt, etc. in the connecting pipe of the regulating valve, and should be cleared in time. Because the valve is closed, a small piece of rust or welding slag is sufficient to destroy the well-worn seat sealing surface, Moreover, these dirt will also cause valve spool and seat wear, affecting its normal operation. Regular service and refueling: Fillers and oilers need to be readjusted after short term use. Dusty occasions to around the stem with a plastic sleeve or rubber sleeve to protect the stuffing box and the guide parts, corrosive gases or droplets in the presence of special protection measures should be used, the general use of anti-corrosion bag wrapped around the control valve, but to Attention can not affect its operation. In the fire resistance requirements of the occasion, you can use special refractory coatings, sets of fire bags and other methods, fire bag material containing multi-layer ceramic fiber or glass fiber. Transport and storage: Control valve dedicated bracket to prevent loosening, to ensure that the overall vertical position or horizontal position. If the long-distance transport, it is best to use a solid wooden shipping. Regularly check the gas source and power supply: Gas source is one of the key energy sources driving the control valve. Pneumatic valve diaphragm chamber does not consume air, but if the gas source system contains moisture, oil and other impurities, it will plug the valve positioner, the relay and other clogging and failure. Therefore, we must regularly check the gas source and power supply to ensure that the gas source clean, dry, reliable power supply. Regulating valve can not operate or can not meet the operational requirements, it means that the fault must be repaired. Can not be affirmed the cause of the malfunction, the general cleaning, demolition, re-test for maintenance. Maintenance is to thoroughly clean the control valve. Regulating valve is easily contaminated by the process fluid, the components must be cleaned by a special method soaked by the process medium. When cleaning to avoid repeated contamination, to be carried out in a safe place. All cleaning tools such as containers, heating equipment, steam hoses, washing equipment and so on should be prepared in advance. When disassembling the control valve, indicate the connection position of the actuator corresponding to the valve body, separate the actuator from the upper valve cover, separate the upper valve cover and the valve body, and then disassemble the upper valve cover and stuffing box parts, Can be removed spool, stem and other components. All disassembled parts and components must be carefully inspected to determine the parts to be repaired and replaced. After demolition, to check the body wall, seat, spool, seal packing and gasket are intact. After dismantling the actuator, carefully inspect the bracket, diaphragm, spring, push rod and threaded connections, etc., of which the bracket is a force component, can not have cracks; diaphragm is the key component, can not be damaged or aged; the spring can not have cracks, For multi-spring actuators, the performance of the entire actuator can be seriously affected as long as one of the springs is damaged. No matter what kind of parts, once corroded or corroded, it is best to replace the new parts. After all the parts and components are repaired, reassemble. In the assembly process, pay attention to the selection of suitable gaskets and bolt connections, accurate alignment, uniform tightening, to prevent flange leakage. The torsional load on a bolt or stud depends on its size and must not be over-tightened. Packing type, quantity and installation methods have a direct impact on the sealing performance, assembly can not be taken lightly. After the actuator is reassembled, apply appropriate lubricant to each friction part, including stem and guide, actuator pushrod and guide.
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