Hydraulic Valve Repair Method

In the actual use of hydraulic equipment, due to various factors, the hydraulic valve may have some failures, thus adversely affecting the normal use of hydraulic equipment, and therefore through a scientific and reasonable method of hydraulic valve failure repair, and better solution is to ensure that the hydraulic equipment can be used normally important means. A hydraulic equipment management and maintenance personnel should have a detailed understanding of the hydraulic valve repair methods and will be proficient in order to effectively deal with hydraulic valve failure, to ensure the good operation of hydraulic equipment.

 

1. Cleaning the hydraulic valve

 

 

In the hydraulic valve repair process, the hydraulic valve disassembly and cleaning is the first process. In the actual use of hydraulic equipment, hydraulic oil pollution will lead to oil deposits or the presence of some granular impurities in the hydraulic oil, these will lead to hydraulic valve failure, usually after disassembly and cleaning will be able to remove these faults, so that the hydraulic valve can restore its function. Hydraulic valve disassembly and cleaning mainly include the following five aspects.

(1) Disassembly. Hydraulic valve, although most of its parts are connected by bolts, the hydraulic valve is designed for non-disassembly, if the lack of special equipment or lack of expertise and forced disassembly, which may lead to the result is damage to the hydraulic valve. Therefore, before disassembly maintenance personnel should master the hydraulic valve structure, and should master the connection between the various parts, in the process of disassembly should be recorded between the different parts of the location of the relationship.

(2) Inspection and cleaning. Check the valve body and spool and other parts, and observe the deposition of dirt, on the basis of the work surface does not cause damage, the use of brushes, cotton yarn, and a non-metallic scraper will be concentrated dirt removal.

(3) Rough washing. The valve spool and valve body in the cleaning box tray placed, and its heating soak, in the bottom of the cleaning tank through the compressed air, the use of bubbles generated by the stirring effect, the residual dirt will be cleaned off, in the conditions allow the feasibility of ultrasonic cleaning.

(4) Fine. First to the cleaning solution for high-pressure positioning cleaning, and then hot air drying. In the enterprise conditions, you can choose the existing freshener, on some special occasions can also be used for organic cleaning agents, such as gasoline and diesel fuel.

(5) Assembly. According to the hydraulic valve schematic or in the disassembly of the recorded parts assembly relationship for assembly, the assembly process should pay attention to careful operation to prevent damage to the parts. Some of the original sealing material, in the actual disassembly process, is easily damaged, so the assembly should be replaced.

 

2. Optional combination of parts repair

 

 

In the process of manufacturing hydraulic valves, in order to make the assembly accuracy can be effectively improved most of them choose the optional method, that is to say, a batch of processed parts, such as spool and valve body, should be based on the actual size of the most reasonable clearance must be selected, and then assembled, so that the spool can ensure a good sliding performance and good sealing performance. In other words, for the same type of hydraulic valve, its body and spool in the fit size may have certain differences exist, the actual use of the process, when the enterprise has a large number of failed hydraulic valves, can be disassembled and cleaned all the hydraulic valve, each part to check the measurement, according to the results obtained from the detection of parts, and then use certain methods to re-combine matching.

After inspection, if the valve body and spool are found to be worn, but the working surface is not seriously scratched or not seriously worn in the local, then you can choose the appropriate clearance body and spool reassembly; if the clearance between the valve body and valve and the clearance specified in the product drawings has increased, and the degree of increase in the range of 20% to 25%, then you should take certain methods Make the spool size increase, and then research and repair. For the conical valve class between the valve seat and the spool, if the conical seat valve in the contact surface sealing is not good, because the conical valve can be in the spring action to automatically compensate for the gap, so, as long as the grinding can be. If the valve body and valve wear lack uniformity or on the work surface there are scratches, the use of the above methods can not make the hydraulic valve function to get a better recovery, then the body and spool should be selected to meet the machining allowance requirements in the amount of interference, for the valve body hole, should be appropriate reaming, for the spool should be appropriate grinding so that the shape accuracy and assembly clearance can be reasonable.

 

3. Size recovery repair and maintenance

 

For repair and maintenance process, it includes many types, in hydraulic valve repair is more applicable and widely used is the brush plating repair method, the method is also known as electroplating repair. For the electric coating repair method, its repair reasonable thickness within 0.12mm, can with uniform wear hydraulic valve repair requirements basically meet, after repair still need further processing. In electroplating repair, the more common process is chemical compound electroplating, the process is based on the development of a mature electroplating process, the advantage is that the operation method is convenient, equipment is relatively simple, and relatively low cost, while relatively easy to control its reaction. In the hydraulic valve repair process, the valve hole or spool surface using the process can be precipitated out of the composition of more composite plating, the plating and plating, and the parent metal can be firmly bonded, and its mechanical strength is relatively high, the thermal conductivity is also relatively good, while its coefficient of thermal expansion is relatively low, in addition, the coefficient of friction is relatively low, and its self-healing ability is also relatively strong, so the use of this method in the hydraulic valve repair can get more ideal results.

 

Changsong Industrial Equipment Shandong Ltd. offer various valves and system solutions required in hydraulic systems. If you are interested in our products, please contact us now!