During the actual use of hydraulic equipment, due to the influence of various factors, some faults may occur in the hydraulic valve, which will have an adverse effect on the normal use of the hydraulic equipment. Therefore, repairing the hydraulic valve fault through scientific and reasonable methods and solving it well is an important means to ensure the normal use of hydraulic equipment. As a hydraulic equipment management and maintenance personnel, you should have a detailed understanding of the hydraulic valve maintenance method and master it proficiently, so as to effectively handle the hydraulic valve failure and ensure the good operation of the hydraulic equipment.
1. Cleaning the hydraulic valve
During the maintenance of the hydraulic valve, disassembling and cleaning the hydraulic valve is the first step. During the actual use of hydraulic equipment, due to the pollution of hydraulic oil, oil sedimentation will occur, or some granular impurities in the hydraulic oil will cause the hydraulic valve to fail. Usually, these faults can be eliminated after disassembly and cleaning, so that the hydraulic valve can restore its function.
2. Repair of optional combined parts
In the process of manufacturing hydraulic valves, in order to effectively improve the assembly accuracy, most of them choose the optional method, that is, for a batch of parts that have been processed, such as valve cores and valve bodies, the most reasonable matching clearance should be selected based on the actual size, and then assembled, so that the valve core can ensure good sliding performance and good sealing performance. In other words, for hydraulic valves of the same type, there may be certain differences in the matching dimensions between the valve body and the valve core. In actual use, when there are a large number of failed hydraulic valves in the enterprise, all hydraulic valves can be disassembled and cleaned, and each part can be inspected and measured. The parts are classified according to the test results, and then a certain method is used to re-combine and match. After inspection, if the valve body and valve core are found to be worn, but there are no serious scratches on the working surface or there is no serious wear in some parts, then the valve body and valve core with appropriate clearance can be selected for reassembly; if the matching clearance between the valve body and the valve is larger than the clearance specified in the product drawing, and the increase is between 20% and 25%, then a certain method should be adopted to increase the size of the valve core, and then it can be repaired. For the valve seat and valve core in the cone valve group, if the contact surface seal in the conical seat valve is poor, since the cone valve can automatically compensate for the gap under the action of the spring, it is sufficient to grind it. If the valve body and valve are not evenly worn or there are scratches on the working surface, the above method cannot restore the function of the hydraulic valve well. In this case, the interference in the machining allowance requirements should be met when selecting the valve body and valve core. For the valve body hole, it should be properly reamed, and for the valve core, it should be properly ground, so that the shape accuracy and assembly clearance can be reasonable.
3. Size recovery repair and maintenance
There are many types of repair and maintenance processes. The most suitable and widely used method in hydraulic valve maintenance is brush plating repair, which is also called electroplating repair. For electroplating repair and maintenance methods, the reasonable thickness of the repair is within 0.12mm, which can basically meet the requirements of uniform wear hydraulic valve maintenance. Further processing is still required after the repair. In terms of electroplating repair and maintenance, the more common process is chemical composite electroplating. This process is developed based on the mature electroplating process. Its advantages are convenient operation, simple equipment, low cost, and easy to control its reaction. In the process of hydraulic valve maintenance, this process can be used to precipitate a composite coating with more components on the surface of the valve hole or valve core. The coating and the parent metal can be firmly combined, and its mechanical strength is relatively high, and the thermal conductivity is also relatively good. At the same time, its thermal expansion coefficient is relatively low, and its friction coefficient is relatively low, and its self-repair ability is also relatively strong. Therefore, this method can achieve relatively ideal results in hydraulic valve maintenance.
