Welding slag, rust, slag, etc. in the pipeline cause blockage or jam in the orifice, guide part, and lower valve cover balance hole, causing strain and scratches on the valve core surface, guide surface, and indentation on the sealing surface Wait. This often happens early in the commissioning of new systems and overhauls. This is the most common failure. In this case, it must be dismantled for cleaning, and slag is removed. If the sealing surface is damaged, it should be ground; at the same time, the bottom plug is opened to flush out the slag that has fallen from the balance hole into the lower valve cover, and the pipeline Rinse. Before putting into operation, let the fluorine-lined electric control valve be fully opened, and the medium flow into the normal operation after a period of time.
For some media that is easy to settle and contain solid particles, it is often blocked at the throttle and the guide, and the flushing gas and steam can be connected to the bottom plug of the lower valve cover. When the valve is blocked or stuck, open the external gas or steam valve, and the flushing work can be completed without moving the fluorine-lined electric regulating valve, so that the valve runs normally.
Install pipe filter method
For small-diameter fluorine-lined electric control valves, especially ultra-small flow-rate fluorine-lined electric control valves, the throttle gap is extremely small, and there must be no slag in the medium. In this case, it is best to install a filter on the pipeline in front of the valve to ensure the smooth passage of the medium. Fluorine-lined electric control valve with positioner, the positioner does not work properly, and its throttle orifice is the most common failure. Therefore, when working with a positioner, the air source must be handled. The usual method is to install an air filter pressure reducing valve on the air source line in front of the positioner.
Increased Throttle Gap
For example, solid particles in the medium or weld slag and rust that have been washed out of the pipeline cannot pass through the throttle opening, causing blockage, jamming, and other failures. You can use a throttle with a large throttle gap-the throttle area is on. Because of the concentrated throttle area rather than the circumferential distribution of the spool and sleeve of windows and openings, faults can be easily eliminated. If it is a single or double seat valve, the plunger spool can be changed to a "V" shaped spool, or a sleeve valve. For example, a chemical plant often has a double seat valve stuck. It is recommended to switch to a sleeve valve, and the problem is immediately resolved.
Use the scouring energy of the medium to scour and take away things that are easy to settle and clogging, thereby improving the anti-blocking function of the valve. The common methods are: ① change to flow-closed use; ② use a streamlined valve body; ③ place the throttle port at the most severe erosion site, using this method to pay attention to improving the erosion resistance of the throttle material.
The through flow is inverted S flow, the flow path is complicated, and there are many dead zones in the upper and lower volume chambers, which provides a place for the precipitation of the medium. Angular connection, medium flows like 90 ° elbow, good scouring performance, small dead zone, easy to design into streamline. Therefore, when using a straight fluorine-lined electric control valve, it can be used as an angle valve when it is slightly clogged. [The above contents are organized and released for you by the valve electric device ]
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