Effective Solutions for Clearing a Jammed Electric Control Valve

During initial system commissioning or after major repairs, welding slag, rust, and other debris can obstruct or jam the throttle, guide parts, and balance holes in the lower bonnet. These issues often lead to scratches on the valve core and guide surfaces, as well as indentations on the sealing surface, which are common causes of failures. In such cases, the valve must be disassembled for thorough cleaning to remove debris. If the sealing surface is damaged, it should be carefully ground. Additionally, opening the bottom plug helps flush out any debris that may have entered the lower valve cover through the balance hole, and the entire pipeline should undergo flushing. Before returning the valve to normal operation, ensure a fluorine-lined electric control valve is fully opened to allow the medium to flow for a period, ensuring proper functionality. When ordinary valves regulate media prone to precipitation and solid particles, blockages often occur at the orifice and guide. To address this, external gas or steam can be connected to the bottom plug of the lower valve cover. Should the valve become blocked or stuck, simply opening the external gas or steam valve can flush the valve without needing to move the fluorine-lined electric regulating valve, thereby maintaining normal operation. For small-caliber fluorine-lined electric control valves, especially those with ultra-small flows, the throttle gap is extremely narrow and requires a debris-free medium. In the event of a blockage, installing a filter before the valve on the pipeline ensures smooth passage of the medium. When using a positioner-equipped fluorine-lined electric control valve, the most common fault is a blockage in the air passage orifice. Prevent this by installing an air filter pressure reducing valve on the air source line before the positioner. Solid particles or debris washed into the pipeline can cause blockages and failures in the throttle area. Increasing the throttle gap helps by using valves with larger throttle openings. Valves designed with concentrated throttling areas such as windows or openings are more effective in eliminating faults. For single or double-seat valves, consider switching to a "V" shaped valve core or a sleeve valve. In chemical plants where double-seat valves often jam, switching to a sleeve valve promptly resolves the issue. Utilize the energy of the medium itself to flush away deposits and blockages, thereby enhancing the valve's anti-blocking capabilities. Methods include switching to flow-closed usage, adopting streamlined valve bodies, and placing orifices in areas prone to severe scouring. When employing this method, ensure the throttle material possesses enhanced erosion resistance. Systems with straight flow paths often feature complex S-shaped flows that create dead zones in upper and lower chambers, where medium deposits accumulate. Transitioning to an angled valve configuration, akin to a 90-degree elbow, improves scouring efficiency with minimal dead zones and facilitates streamlined design. Thus, when facing slight blockages, consider switching from a straight-through fluorine-lined electric regulating valve to an angled valve configuration for enhanced performance.