1, a large opening to extend the life span of the valve so that the beginning of the work on the maximum opening, such as 90%. In this way, cavitation, erosion and other damage occurred in the spool head. With the destruction of the valve, the flow increases, the corresponding valve and then off, so constantly damaged, and gradually closed, so that the entire valve fully utilize until the valve core and sealing surface damage, can not be used so far. At the same time, the opening of large opening throttle gap, erosion weakened, which than the beginning of the valve in the middle of the opening and a small opening work to improve life expectancy of 1 to 5 times. Such as a chemical plant using this method, valve life increased by 2 times. 2, to reduce S to increase the work to improve the life-span method to reduce the S, that is, increase the system in addition to the loss of control valve to reduce the pressure drop assigned to the valve, in order to ensure that the flow through the control valve will inevitably increase the control valve Opening, at the same time, reducing the pressure drop on the valve, cavitation, erosion also weakened. The specific measures are: set the orifice plate after the valve to save consumption pressure drop; close the pipeline on the manual valve in series to the control valve to obtain a more ideal job opening so far. The valve at the beginning of a large opening in the small work, the use of this method is very simple, convenient and effective. 3, to narrow the opening to increase the work to improve the life of the law by reducing the diameter of the valve to increase the work of the opening, the specific methods are: â‘ for a smaller size of the valve, such as DN32 into DN25; â‘¡ body Do not change, replace the small seat diameter valve seat. As an overhaul of a chemical plant will be djl parts dgl0 replacement, life expectancy increased by 1 times. 4, transfer damage position to improve life expectancy to the place of serious damage to the secondary location to protect the valve seat sealing surface and throttle face. 5, increase the throttling channel to increase life span method The easiest way to increase the throttling channel is to thicken the valve seat, the valve seat hole growth, the formation of a longer throttling channel. On the one hand, it can delay the sudden expansion of the flow-closure type after the throttle, delay the transfer and destroy the position and keep it away from the sealing surface; on the other hand, increase the throttling resistance and reduce the recovery of the pressure, Erosion diminished. Some of the valve seat hole designed to step, wave-type, is to increase the resistance, weaken the cavitation. This method is often used when introducing high-pressure valves in devices and improving older valves and is also very effective. 6, change the flow direction to improve life Open flow toward the open direction, cavitation, erosion mainly in the sealing surface, so that the valve core and valve seat sealing surface quickly damaged; flow closed toward the closed direction flow , Cavitation erosion role in the throttle after the valve seat sealing surface to protect the sealing surface and the valve root, extending the life. Used as open-flow valve, when the problem of extending life expectancy is more prominent, just change the flow direction can extend the life of 1 to 2 times. 7, the use of special materials to improve life expectancy Law for the anti-cavitation (damage to the shape of small honeycomb dot) and erosion (streamline small groove), can be replaced by cavitation erosion and erosion of special materials to create throttling pieces. This special materials are 6YC-1, A4 steel, Secretary too Lai, cemented carbide. For anti-corrosion, can use more corrosion-resistant, and have certain mechanical properties, physical properties of the material. This material is divided into two types of non-metallic materials (such as rubber, PTFE, ceramics, etc.) and metal materials (such as Monel, Hastelloy, etc.). 8, change the valve structure to improve life span method to change the valve structure or choose to have a longer life of the valve approach to achieve the purpose of improving life expectancy, such as the use of multi-stage valve, anti-cavitation valve, corrosion-resistant valve.
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