How to extend the service life of control valve

The regulating valve is also known as the control valve By receiving the control signal output by the regulating control unit, the regulating valve changes the fluid flow with the help of power operation Regulating valve is generally composed of actuator and valve According to the power of the actuator, the control valve can be divided into three types: pneumatic control valve, electric control valve and hydraulic control valve In addition, the throttle valve is often used in the harsh conditions and installed on the heavy process pipeline The working conditions are extremely complex Once there is a problem, it is difficult to find out the problem because of its bulkiness, which often makes people helpless, and also involves the system operation , system integrity, regulation quality, environmental pollution and other issues, so the rational use of ceramic control valve, more extensive maintenance, extend its service life, is the primary problem of using ceramic control valve 1 Cleaning the welding slag, rust, solidified slag, iron wire, cloth and so on in the pipeline to prolong the service life of the regulating valve They cause blockage or jamming at the throttle port and the guide part, which causes the valve core to break It often occurs in the initial stage of operation after the new operation system and overhaul This is a common failure of Zui In this case, it is necessary to remove the slag for cleaning If the sealing surface is damaged, it is also necessary to grind it At the same time, open the bottom plug to flush the slag and flush the pipeline Before putting into operation, the regulating valve shall be fully opened to let the medium flow for a period of time before it is put into normal operation 2 Increase the opening and prolong the service life Try to work on Zui large opening when using ceramic regulating valve, such as 80% In this way, the erosion, wear and other damages of Zui initial impurities in the pipeline occur outside the damaged part of the valve core After removing the impurities in the pipeline, adjust the opening of the regulating valve to a place with a slightly larger normal opening With the damage of the fluid to the valve core, the flow increases and the opening decreases accordingly In this way, the valve core is continuously damaged and gradually closed to make full use of the whole valve core until The valve core root and sealing surface are damaged and cannot be used 3 To increase the diameter and improve the service life, we use the formula of CV value to calculate the correct CV so as to select the appropriate valve diameter At the same flow rate, the smaller the valve diameter, the faster the flow rate of the fluid, and the more severe the erosion of the medium to the valve core and seal It is suggested that the user should increase the diameter of the valve within the range of opening free adjustment, so as to reduce the wear 4 Transfer the damaged position to improve the service life and transfer the seriously damaged position to the secondary position to protect the sealing surface and throttling surface of the valve core and valve seat Generally, ceramic ball valve is seriously eroded, and the place where the fluid speed is fast is the lower part of the fluid inlet For the current three piece structure of ceramic ball valve, the ball core can be reversed for use, so that a ball core can be used at the inlet four times, extending the service life of the valve by four times 5 In order to make the valve structure more reasonable, the ceramic control valve Zui has been changed into a three piece structure, which is commonly used now Because of its double seats, this structure also has the characteristics of double sealing At the same time, when choosing ceramic ball valve, we should pay attention to the valve with inclined transition design, which can reduce the impact of fluid.