1. The orifice, guide position, and balance hole of the lower valve cover are blocked or the orifice, guide position, and balance hole of the lower valve cover are blocked or blocked, the curved surface of the valve core is blocked, the guide surface is stretched and scratched, and the protruding surface is indented, etc. This often occurs in newly put into operation systems and in the early stages of operation after overhaul. This is a common failure. In this case, it must be disassembled and cleaned to remove slag. If the protruding surface is damaged, it should be ground; at the same time, open the bottom plug to wash away the slag that fell from the balance hole into the lower valve cover, and inspect the pipe. Clean. Before transportation, let the gate valve be fully opened, and the medium will be included in normal operation after flowing for a period of time.
2. The steam gate valve can be cleaned externally at the blockage at the bottom of the lower valve cover. When the gate valve is clogged or clogged, opening the external gas or steam gate valve can complete the cleaning work of the stationary gate valve and make the valve work normally.
3. The throttling gap of the gate valve is small and there is no small residue in the medium. In case of blockage, install a filter on the pipe in front of the valve to ensure smooth completion of the media. Therefore, when working with a locator, the air source must be properly handled. The generally adopted method is to install an air purification gate valve on the air source pipeline in front of the locator.
4. Faults such as blockage and blockage due to inability to pass through the orifice. Due to the concentrated throttling area, the throttling area can be changed to open windows, open valve cores and sleeves. If it is a single-seat valve, the double-seat valve can change the shape of the plunger valve core "V" valve core, or change it to a sleeve valve, etc. It is recommended to solve the problem immediately after replacing the sleeve valve.
5. The gate valve medium scouring method uses the scouring energy of the medium itself to wash away and take away items that are easy to precipitate and block, thereby improving the clog removal function of the valve. Change the gate valve to flow-closed use; choose a streamlined valve body; place the throttle in a place with severe erosion. When choosing this method, attention should be paid to improving the wear resistance of the throttling material.
6. The direct flow is changed to the angle method. The direct flow is an inverted S flow. The flow path is complicated and there are many dead areas in the upper and lower chambers, which creates a place for the medium to settle. Angular connection, the medium seems to flow through a 90°C elbow, with good flushing performance, small dead zone, and easy design into a streamlined shape. Therefore, when a direct gate valve is used to cause slight obstruction, an angle valve can be used instead.
