In the industrial automation instruments, the regulating valve is a heavy, combined with simple structure, attention is often not. However, it is in the process pipeline, the working conditions of the complex, if there are problems, we also hand busy busy feet. Because of its bulky, difficult to identify the problem, often thankless, but also put into operation system, the system completely, adjust the quality and environmental pollution.
First, raise the life expectancy method (8 methods)
1) to extend the life of the work of opening the Law
Regulating valve so that the beginning as far as possible on the maximum aperture, such as 90%. In this way, cavitation, erosion and other damage occurred in the head on the spool. With the valve core damage, increased traffic flow, the corresponding valve clearance a little longer, so continue to disrupt, and gradually shut down, so take full advantage of all of the spool until the spool and the sealing surface root damage, can not be used so far. At the same time, the work of opening big savings gap, and erosion weakened the very beginning than the valve opening in the middle and the small opening on the work life of 1 to 5 times more. Such as a chemical plant using this method, the service life of valve-fold increase of 2.
2) reduce the increase of the work of opening S and increased life expectancy method
Reduce S, that is, in addition to increasing the system valve outside losses to the distribution of the valve to reduce the pressure drop, in order to ensure flow through the valve, will inevitably increase the valve opening at the same time, reducing the valve on the pressure drop, so that cavitation, erosion is also reduced. Specific measures are as follows: after the valve pressure drop for plate cutting consumption; the closure of the manual control valves in series on the road to a more ideal valve opening until the work. The beginning of a major election in a small valve opening work, the use of this method is very simple, convenient and effective.
3) work to narrow the aperture diameter increases and increased life expectancy method
Through the valve to reduce the diameter to increase the opening work, the specific ways: ① replace a file of small-caliber valve, such as DN32 replaced DN25; ② body does not change, the replacement of small diameter spool valve seat Block. Such as a chemical plant overhaul will be replaced by cutting dgl0 items dg8, life expectancy increase by 1 percent.
4) damage to the location of the transfer method to improve the life of serious damage to the local transfer to a secondary position, to protect the valve core and valve seat sealing surface of the cutting surface.
5) growth in savings and increased life expectancy Law channel
Expenditure growth is the simplest channel thickening seat, so that the valve seat hole growth, the expenditure of the formation of a longer passage. On the one hand, closed-type savings can flow after a sudden
The expansion of a delay in the transfer of damage from the location of the sealing surface away from the role; On the other hand, an increase of cutting resistance, the pressure reduces the recovery, so that reduced cavitation. Some are designed to seat stepped hole, wave-like, that is, to increase the resistance and weaken cavitation. This method of introducing high-pressure valve device and the old valve will often be used to improve, but also very effective.
6) changes in flow and increased life expectancy method
Flow toward the opening direction of open-type flow, cavitation, erosion a major role in the sealing surface, so that the roots spool and spool valve seat sealing surface damage quickly; flow towards the closure of the direction of closed-type flow, cavitation, erosion role in reducing expenditure, the valve seat sealing surface below the protection of the sealing surface and the valve core roots, the prolongation of life. There were no open-type use flow valve, when the issue of prolonging life is more prominent, simply change the flow of life can be extended 1 to 2 times. 7) to use special materials to increase life expectancy method
For the anti-cavitation (damage to the shape of small points, such as honeycomb) and washed (streamline the minor groove), would be able to cavitation and erosion-resistant special materials to create expenditure items. This special material 6YC-1, A4 steel, Stellite Levin, carbide, etc.. For anti-corrosion can be switching to a more corrosion-resistant and have a certain mechanical properties, physical properties of materials. This material is divided into non-metallic materials (such as rubber, PTFE, ceramics, etc.) and metal material (such as Monel, Hastelloy, etc.) two types.
8) to change the valve structure to improve life expectancy method
Taken to change the structure or the selection of valves with longer life expectancy of the valve means to achieve the purpose of life, such as the choice of multi-level-type valve, anti-cavitation valve, valve, such as corrosion resistance. Second, often stuck valve or blockage of the block (card) method (6 methods)
1) cleaning method
Pipe welding in the slag, rust, and other waste products to reduce expenditures, the mouth-oriented site, the balance under the valve cover or plug the hole caused so stuck spool surface, surface-oriented and have a scratch injury, have a sealed surface indentation and so on. This often happens in the new system put into operation and put into operation after the initial overhaul. This is the most common fault. In such cases, the washing must be disposed of opening, with the exception of掉渣objects, such as the sealing surface should be abrasive damage; At the same time will open at the end of Sierra Leone in order to flush into the hole from the balance valve cover under the Java objects, and pipeline for washing. Put into operation before the full-regulating valve so that, for some time before the mobile medium into normal operation.
2) external erosion method
Easy to some precipitation, the medium containing solid particles in the ordinary valve adjustment often to reduce expenditures, the mouth of Service-oriented plug, valve cover at the end of the next external Cypriot Department scouring gas and steam. When the valves have a plug or jammed, the open external valve of the gas or steam can be fixed in the case of valve flushing the work completed so that the normal operation of valve.
3) the installation of pipe filter method
The regulation of small-caliber valve, especially the ultra-small flow control valve, the savings gap special small, medium there can be a little bit of Java objects. In such a case to plug the best pipeline in the valve is installed on a pre-filter, so as to ensure the smooth passage of media. With the use of locator control valve, locator is not working correctly, the gas inlets cutting is the most common fault. Therefore, the work zone locator, it is important to handle the gas source, is commonly used in the locator pipeline before the gas relief valve is installed on the air filter
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