Control valve stuck or blocked approach

Cleaning method Pipe in the welding slag, rust, slag, etc. in the throttle, guide parts, under the valve cover to balance the hole caused by blockage or stuck so that the valve surface, the guide surface of the resulting injury and scratches, sealing surface produced Indentation and so on. This often occurs in the early delivery of new delivery systems and overhauls. This is the most common failure. In this case, you must uninstall the cleaning, remove the slag material, such as the sealing surface is also damaged should be ground at the same time the bottom plug to open to flush away from the balance hole into the valve cap slag material, and the pipeline Rinse. Put into operation before the fluorine-flush valve to open fully, the medium flow for a period of time before being incorporated into normal operation. External scouring method For some easy to sediment, the medium containing solid particles using ordinary valve adjustment, often in the throttle, the guide block, can be flush at the bottom of the valve cover flushing gas and steam. When the valve is clogged or stuck, open the external gas or steam valve to complete the flushing work without moving the fluorine regulator valve to make the valve run normally. Install the pipeline filter method on the small-diameter fluorine fluorine regulating valve, especially ultra-small flow fluorine valve, the throttle clearance is very small, medium can not have a little slag material. In this case of blockage, it is best to install a filter on the valve before the pipeline to ensure the smooth passage of media. Fluorine-adjusting valve with locator, locator does not work properly, the blockage of the air passage throttle is the most common failure. Therefore, the work with the locator, you must handle the gas source, the commonly used approach is to install the air filter regulator on the front gas line to increase throttle throttling gap method such as the media of solid particles or pipe was washed Out of the welding slag and rust and other overcrowding caused by congestion, stuck and other failures, can be used to throttle large throttle pieces - throttle area for the window, the opening of the spool, sleeve, Because of its concentrated throttle area rather than the circumference of the distribution, the fault can be easily ruled out. If it is single, two-seater valve plunger can be changed to "V" -shaped spool, or into the sleeve valve. For example, a chemical plant often have a double-seat valve stuck, it is recommended to switch to sleeve valve, the problem was resolved immediately. Media scouring method uses the scouring energy of the medium itself, scouring and removing easily sedimentation, easy to block things, thereby improving the valve anti-blocking function. Common methods are: ① closed for the flow of closed-type use; ② the use of streamlined body; ③ the throttle placed in the erosion of the most powerful, using this method should pay attention to improve the erosion-resistant materials, parts erosion. Straight through the angle method for the inverted S flow, the flow path is complex, the upper and lower cavity dead zone for precipitation of the media provides a place. Angular connection, like 90 ° elbow flow through the medium, erosion performance, small dead zone, easy to design streamlined. Therefore, the use of straight through the fluorine regulator valve slightly blocked can be changed to the use of angle valve.