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With the hydraulic valve extended use of time, failure or failure is inevitable. Hydraulic valve failure or failure is mainly due to wear and tear caused by cavitation and other factors with the gap is too large, hydraulic valve leakage and hydraulic fluid caused by the deposition of hydraulic valve spool malfunction or clamping due. When the hydraulic valve failure or failure, most companies use the replacement of new components to restore the hydraulic system functions, the failure of the hydraulic valve has become a waste. In fact, the majority of these hydraulic valves are still in good condition and can be restored by local service. Research hydraulic valve repair is not only the significance of saving the purchase cost of components, when the failure of the hydraulic valve without spare parts or ordering takes a long time, and the equipment may therefore be shut down for a long time can be maintained through the maintenance of equipment and even the entire production line operation of its economic benefits It is quite impressive. In the hydraulic valve repair practice, the common repair process has hydraulic valve cleaning, parts mix matching, repair dimensions, are described below. 1 hydraulic valve cleaning and disassembly cleaning hydraulic valve repair is the first process. For hydraulic oil pollution caused by oil deposition, or hydraulic oil particulate impurities caused by the hydraulic valve failure, the demolition of the general cleaning can be troubleshooting, restore hydraulic valve function. Common cleaning processes include: (1) Disassembly. Although many parts of the hydraulic valve are bolted, the design of the hydraulic valve is non-disassembled. If there is no special equipment or expertise, forcible disassembly is likely to cause damage to the hydraulic valve. Therefore, before disassembly to master the structure of the hydraulic valve and the connection between the parts, the disassembly records the relationship between the location of the parts. (2) check and clean. Check the valve body, valve parts and other parts of the dirt deposition, without damaging the work surface under the premise of using cotton yarn, brush, non-metallic scraper to remove concentrated dirt. (3) rough wash. The valve body, the spool and other parts on the cleaning box tray, heated soaking, compressed air will pass into the bottom of the tank, through the stirring effect of bubbles, cleaning the residual dirt, the conditions can be ultrasonic cleaning. (4) Fine wash. High-pressure cleaning with cleaning fluid positioning, and finally dried with hot air. Conditional companies can use the existing cleaning agents, some occasions can also use organic cleaning agents such as diesel, gasoline. (5) Assembly. Assemble according to the assembly diagram of the hydraulic valve or the recorded parts assembly relationship during disassembly. Be careful not to bump parts during assembly. The original sealing material in the demolition of easily damaged, should be replaced when assembled. Pay attention to the following questions when cleaning: (1) For long deposition time, paste the solid dirt, do not scratch the mating surface when cleaning. (2) pay attention to safety when heating. Some inorganic cleaning fluid is toxic, heating can cause toxic poisoning, should be used with caution; organic cleaning fluid flammable, pay attention to fire. (3 When choosing the cleaning liquid, pay attention to its corrosion, to avoid corrosion on the valve body (4) After cleaning parts should be kept to avoid corrosion or re-contamination (5) assembled hydraulic valve to pass the test before passing into use . 2 parts and components optional maintenance method Hydraulic valve manufacturing process, in order to improve assembly accuracy and more use of matching methods, that is, a batch of finished parts, such as valve body and valve core, according to the actual size to choose the most appropriate one with the gap Assembly, to ensure good spool sliding and sealing performance.That is, the same type of hydraulic valve, spool and valve body with the size of a certain difference For the use of business, when the number of a failure of hydraulic valve More often, you can disassemble and clean all the valves, inspect and measure the parts, classify the parts according to the test results, and recombine them according to the following methods: After checking if the valve core and the valve body are evenly worn, the working surface is not severely scratched or Local serious wear, then in accordance with the manual, select the spool with the appropriate clearance, the valve body reassembly; If the valve body, body wear uneven Even if the work surface is scratched, the hydraulic valve function can not be restored by the above method, and a pair of valve spools that meet the interference allowance of the machining allowance are selected. The valve body (the small bore valve body and the large outer diameter dimension Valve core), the hole on the valve reaming or grinding, the valve core grinding, to achieve a reasonable shape accuracy with precision assembly. Common hydraulic valve hole shape accuracy and with the gap shown in Table 1. 3 recovery size maintenance Although the process is relatively simple, the hydraulic valve with the method of spare parts matching has its limitations, and the repair dimension method is adopted to adapt to a wider range of occasions. The simple and feasible methods for repairing the size are mainly the replacement part method and the repair method. The parts method is to disassemble the spool that has lost the cooperation accuracy, measure and draw the part drawing; check the degree of wear or damage of the valve guide hole or the valve seat, and then determine the amount of repair and repair, and then finish the work Grinding) repair.For a certain degree of taper of the valve seat, to make a specific processing tools.After processing to the corresponding accuracy, measuring the actual size, and then processing a new spool according to this size This maintenance method of high maintenance precision, wide adaptation, can completely restore the original accuracy, suitable for a certain processing capacity of the enterprise.Patch maintenance of many types of processes, suitable for hydraulic valve repair the most common process for the brush plating Or known as electrocoating.Coating reasonable repair thickness is less than 012mm, basically meet the uniform wear hydraulic valve maintenance requirements, after repair still need to follow-up processing.Commonly used electroplating process is chemical compound electrocoating, chemical compound electricity Coating is developed on the basis of mature electroplating process, with the advantages of simple equipment, easy operation, low cost, easy reaction control, the process can be deposited in the valve core or valve hole with a variety of composite coating composition, coating And the parent metal with a solid and has high mechanical strength, excellent thermal conductivity, low thermal expansion coefficient, low coefficient of friction and strong self-healing ability Typical chemical composite plating bath formulation and process conditions in Table 2 . 4 Summary The carefully repaired hydraulic valve not only restored the original function, its life, work performance and reliability Can be close to the original level, in the maintenance of new technology, new materials can also extend its life and improve work performance. Due to the different levels of maintenance technology and equipment of different enterprises, there will be great differences in the quality of maintenance. For those enterprises that lack maintenance equipment and technology, even if the hydraulic system is restored to its original condition through maintenance, supervision should be strengthened and spare parts should be actively purchased to deal with unexpected failures.