Hydraulic Valve Application And Maintenance

All the details of the design should be fully considered whether it can meet the needs of the device or equipment use. Before we design the hydraulic valve, we must first consider whether the hydraulic valve can meet the requirements of the entire hydraulic valve group, whether it can achieve each hydraulic machinery of each functional requirements, and finally to determine whether the design has been carried out in accordance with the principles of the entire hydraulic system. Although the hydraulic valve group is a combination of a certain number of hydraulic valves, it still has a lot of internal components, the number of these components can neither be particularly large nor reduced. If the number of these components is too much will increase the burden of the hydraulic valve group, that is, the design is not reasonable, once the number of components is small, the oil circuit integration will lose part of the role, not achieve the expected effect, and will waste materials.

 

1. The design principle of hydraulic valve

The design of the hydraulic valve is mainly for the design of the hydraulic valve group, and the hydraulic valve group must be considered before the design of the oil circuit, to determine in advance which parts of the oil circuit can be integrated, into the design of the oil circuit must pursue simple, to eliminate unnecessary steps. After determining the oil circuit, the main thing is the slant hole as well as the process hole, these things in the oil circuit should be reduced, so that as long as enough can be used, unnecessary too much, in the design of the slant hole and process hole should pay attention to the aperture and flow with the direction and location must be appropriate, to consider the overall situation, to ensure that the requirements are met. If there is some inappropriate direction or location, the need to adjust the components must ensure that it can be simple and convenient operation and maintenance.

 

The design of the hydraulic valve is first discussed in terms of the design dimensions of the hydraulic valve. The length, width, and height of the hydraulic valve set are generally determined with reference to the size of the components that make up the hydraulic valve set, for example, the height of the hydraulic valve set, without affecting the actual role of the premise, as far as possible to keep in line with the height of the components. The length of the hydraulic valve group, without affecting the layout and structure, is determined by the hole diameter of the screw hole or the size of the length.

 

The width of the hydraulic manifold is determined by roughly the same factors as the length. Next, we introduce labeling dimensions, this step is mainly applied in the design of the drawing, to label the ports of some components, apertures, the size of each group, size, etc. Finally, the design of the channel, the most important thing in this design is the layout, a comprehensive overall arrangement of the system, the classification of the oil circuit, first of all, must make the main oil circuit, and then, for the small oil circuit or other oil circuit and then gradually guide. These hydraulic valve channels, in the design of the time, must ensure that the length is appropriate, the corner is relatively small, and the hole of the oil channel is appropriate, so as to effectively control the weight, size, and volume of the hydraulic valve group, in order to make reasonable use of.

 

2. The application of hydraulic valve set

In the present situation, according to different situations and different uses of hydraulic valves, hydraulic valves can be divided into many types, this article focuses on one of them, this hydraulic valve set includes four parts, it is composed of the cartridge, control cover, pilot control valve and integrated block of two-way cartridge valve.

The following describes the main contents and functional uses of these four parts. The structure of the cartridge can be considered as a slide valve or cone valve, the role of this part of the component is very important to control the flow direction, flow rate, and pressure of the oil in the channel or elsewhere. The control cover can effectively control the cartridge valve real-time work, mainly because it is composed of a number of pilot control components, these components can regulate or control the work of the cartridge valve, this control cover is basically even a bridge, connecting the control valve and components, and, the pilot control valve should also be selected to install on it.

 

 

Two-way cartridge valve in the current situation in our country is more common, from the economic point of view, because its components and the necessary piping connection are relatively small, it is easy to integrate, so it is very convenient and suitable for large-scale go mass production, which can largely reduce production costs. From the point of view of use, its structure determines that it will be small in size so it is very convenient, and its high speed of control and switching determines that it is very efficient and reliable in use. In addition, it can be controlled with high power, which has the advantage that the loss of pressure will be reduced and the loss of heat will also be reduced. Finally, the two-way cartridge valve is not affected by commutation. The main role of the two-way cartridge valve is to connect the route of the fluid or control it to disconnect.

 

3. Maintenance of hydraulic valve

With the growth over time, the hydraulic valve will inevitably have some failure, which involves the maintenance of the hydraulic valve. In actual production, the maintenance of the hydraulic valve is mainly timely cleaning, some parts of the combination of optional, as well as the size of the repair. Hydraulic valve channels have oil, it is easy to occur the precipitation of oil, the precipitation will make the hydraulic valve some unnecessary failure, so we must promptly clean up, the hydraulic valve disassembly and then cleaning, so as to timely make the function of the hydraulic valve to restore.

 

Cleaning time to pay attention to safety, a lot of precipitation is not easy to clean and needs some cleaning fluid, these cleaning fluids are generally corrosive or toxic, and even some are flammable, so must be careful and cautious. After cleaning the finished parts must be well stored, so that it does not appear to be corroded again. After the cleaning is completed and then installed, the hydraulic valve can continue to operate after testing. If some parts of the hydraulic valve are broken and serious, in this case generally choose to reassemble the optional. Hydraulic valves if there is special experienced personnel maintenance, will greatly increase their life, and their reliability and performance will be maintained at the original level, even so, we should be vigilant in the daily production, to prevent accidents.

 

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!

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!