In the complex system of the steam turbine, the solenoid directional valve 0508.919T0101.AW002 plays a vital role. It controls the flow direction of the hydraulic oil, thereby realizing precise control of each component of the steam turbine. Good maintenance and effective fault prevention measures can ensure the stable operation of the solenoid directional valve and ensure the safe and efficient operation of the steam turbine.

I. Working principle and structural characteristics of solenoid directional valve 0508.919T0101.AW002

The solenoid directional valve 0508.919T0101.AW002 is mainly composed of valve body, valve core, electromagnetic coil and other parts. Its working principle is to use the electromagnetic force generated by the electromagnetic coil when it is energized or de-energized to push the valve core to move in the valve body, thereby changing the flow direction of the hydraulic oil and realizing the corresponding control function.

The solenoid valve 0508.919T0101.AW002 adopts an oil-immersed design, which has unique advantages. On the one hand, it can play a buffering role and effectively reduce the noise generated during operation; on the other hand, it can eliminate the friction between the valve core and the oil seal, reduce the oil leakage caused by friction, and greatly extend the service life of the reversing valve. In addition, its valve core, coil and galvanized iron pipe can be disassembled and replaced, which makes installation and daily maintenance more convenient and reduces maintenance costs. The valve body is manufactured by resin sand mold forging process and then cleaned by ultrasonic cleaning machine, which can effectively prevent foreign matter from remaining and improve the reliability of the product. The galvanized iron pipe is welded by three sections of equipment. This process can prevent the influence of residual magnetism and make the reversing valve have higher strength and pressure resistance.

II. Maintenance skills

(I) Daily inspection

Appearance inspection: During each inspection, carefully observe the appearance of the solenoid valve 0508.919T0101.AW002. Check whether there are cracks, wear, deformation, etc. on the surface of the valve body, and pay special attention to whether the connection parts are loose. If the valve body is found to have obvious damage, it may affect its sealing and normal operation, and needs to be handled or replaced in time. Check whether the surface of the electromagnetic coil has signs of overheating, discoloration, burning, etc. If there is a problem with the electromagnetic coil, it will directly cause the reversing valve to fail to operate normally. If the coil is found to be abnormal, measure its resistance value in time to determine whether the coil needs to be replaced.

Sound check: During the operation of the turbine, listen carefully to the sound of the solenoid valve 0508.919T0101.AW002 when it is working. Under normal circumstances, the solenoid directional valve will have a crisp and uniform sound when it is in action. If you hear abnormal noise or stuck sound, it may indicate that the valve core is stuck or has other internal faults. At this time, it is necessary to further check the movement of the valve core.

(II) Regular cleaning

External cleaning: Regularly clean the outside of the solenoid directional valve to remove dust, oil and other impurities on the surface. You can use a clean cloth or brush to gently wipe the surface of the valve body. For some stubborn oil stains, you can use an appropriate amount of special detergent to clean it, but be careful to avoid the detergent from entering the inside of the reversing valve.

Internal cleaning: The solenoid valve 0508.919T0101.AW002 needs to be cleaned internally at regular intervals. First, the reversing valve should be disassembled according to the correct operating procedures. During the disassembly process, it is important to mark it for correct installation. After removing the valve core, coil, galvanized iron pipe and other components, use clean hydraulic oil or special cleaning fluid to clean them. When cleaning, you can use a soft brush to gently scrub to remove internal dirt and impurities. After cleaning, use clean compressed air to blow dry the components to ensure that there is no residual moisture. When installing the components back, apply an appropriate amount of grease to reduce friction and ensure smooth movement of the valve core.

(III) Lubrication and maintenance

Valve core lubrication: The valve core is the key moving part of the solenoid directional valve, and it is very important to lubricate and maintain it regularly. After each internal cleaning, apply a thin layer of grease suitable for the hydraulic system on the surface of the valve core. The choice of grease should be determined according to the working environment and requirements of the solenoid directional valve to ensure that it has good lubrication and anti-wear properties.

Lubrication of other moving parts: In addition to the valve core, other parts that may have relative movement, such as the contact parts between the seal and the valve body, also need to be properly lubricated. A small amount of grease or lubricating oil can be used to apply to reduce wear and prevent damage to parts due to excessive friction.

(IV) Electrical connection inspection

Wiring firmness: Regularly check whether the wiring of the solenoid valve 0508.919T0101.AW002 coil is firm. Loose wiring may cause poor contact, causing the solenoid coil to overheat or even damage. When checking, make sure that the terminal is tightened and the wires are not damaged or aged. If there is a problem with the wiring, repair or replace it in time.

Insulation performance test: Use an insulation resistance tester to regularly test the insulation performance of the solenoid coil. Good insulation performance is the guarantee for the normal operation of the solenoid coil. If the insulation resistance value is too low, it may indicate that the coil is damp or the insulation layer is damaged. Further inspection and corresponding treatment measures are required, such as drying or replacing the coil.

3. Prevention of common faults

(I) Prevention of valve core stuck fault

Filtration system maintenance: Impurities in hydraulic oil are one of the main causes of valve core stuck. Therefore, it is necessary to ensure the normal operation of the filtration system in the hydraulic system. Regularly replace the hydraulic oil filter element and select a filter element with high filtration accuracy and reliable quality. At the same time, the hydraulic oil should be tested regularly. When the contamination of the hydraulic oil exceeds the specified standard, it should be replaced or filtered in time to ensure the cleanliness of the hydraulic oil.

Avoid foreign matter from entering: When maintaining and overhauling the turbine system, pay attention to prevent foreign matter from entering the solenoid directional valve. When disassembling and installing related components, clean the work area and use clean tools. During the operation of the equipment, ensure that the hydraulic system is well sealed to prevent external dust, debris, etc. from entering the system, thereby preventing foreign matter from entering the reversing valve and causing the valve core to stick.

(II) Prevention of electromagnetic coil faults

Overvoltage protection: The electromagnetic coil is easily impacted by overvoltage during operation, resulting in damage. In order to prevent the influence of overvoltage on the coil, an overvoltage protection device such as a varistor and a lightning arrester can be installed in the electromagnetic coil circuit. These protective devices can quickly limit the overvoltage to a safe range when overvoltage occurs, protecting the electromagnetic coil from damage.

Temperature control: The electromagnetic coil will generate heat during long-term operation. If the temperature is too high, it will affect the performance and life of the coil. Therefore, effective temperature control measures should be taken. For example, a heat dissipation device, such as a heat sink, a fan, etc., can be installed near the electromagnetic coil to help the coil dissipate heat. At the same time, the working temperature of the electromagnetic coil should be monitored. When the temperature exceeds the normal range, the cause should be checked in time and corresponding cooling measures should be taken.

(III) Prevention of seal failure

Regular replacement of seals: The seals will gradually age and wear as the use time increases, resulting in seal failure. In order to prevent the occurrence of seal failure, the seals should be replaced according to the prescribed cycle. When selecting seals, ensure that their materials and specifications match the solenoid directional valve to ensure good sealing performance.

Correct installation of seals: When installing seals, strictly follow the installation instructions. Ensure that the seals are installed in place to avoid distortion, extrusion, etc. During the installation process, you can apply an appropriate amount of sealant to enhance the sealing effect. At the same time, attention should be paid to protecting the surface of the seal to avoid scratches during installation, which will affect the sealing performance.

(IV) Prevention of hydraulic shock failure

Reasonably adjust the system pressure: Sudden changes in the pressure of the hydraulic system will produce hydraulic shock and damage the solenoid directional valve. Therefore, it is necessary to reasonably adjust the pressure of the hydraulic system to avoid excessive pressure fluctuations. When starting and stopping the turbine, the pressure should be adjusted slowly to make the system pressure change smoothly. At the same time, buffer devices such as accumulators can be installed in the hydraulic system to absorb hydraulic shock energy and protect the solenoid directional valve and other hydraulic components.

Optimize the action time of the reversing valve: Too fast action time of the solenoid directional valve may also cause hydraulic shock. By optimizing the control system and appropriately extending the action time of the reversing valve, the flow of hydraulic oil can be smoother and the generation of hydraulic shock can be reduced. According to the actual situation, the control parameters of the solenoid directional valve, such as the power-on and power-off time of the electromagnetic valve, can be adjusted to achieve the best working effect.

For the solenoid directional valve 0508.919T0101.AW002 on the steam turbine, the reliability and stability of its operation can be greatly improved through scientific and reasonable maintenance techniques and effective common fault prevention measures. At the same time, timely and accurate diagnosis and treatment can be carried out when a fault occurs, which can reduce equipment downtime, ensure the normal operation of the steam turbine, and provide strong support for the stable development of related industries such as power production.

When looking for high-quality, reliable solenoid valves, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:

E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229