1. Cleaning method
Pipe welding slag, rust, slag, etc. in the throttle, steering parts, under the valve cover hole to balance caused by blocked or stuck to the spool surface, surface oriented production strain and scratches, sealing surface indentation. This often happens in the new operation system and put into operation after the initial repair. This is the most common fault. Encounter this situation must be disassembled for cleaning, remove residue, such as the sealing surface is damaged should be grinding; at the same time, open the bottom plug, to flush from the balance fall into the hole under the valve cover the slag material and pipe flushing. Before operation, to adjust valve fully open, then the medium flows into the normal operation after a period of time.
2. External washing method
For some easy to precipitate solid particles of the medium containing the ordinary valve adjustment, often in the throttle, oriented at the jam, at the end of the lower valve cover plug connected to erosion of gas and steam. When the valve is blocked or stuck, open the external gas or steam valve, can not be adjusted in the case of the valve to complete the flushing work, so that the normal operation of the valve.
3. The installation of pipe filter method
For small caliber valve, especially the ultra small flow control valve, the throttle gap is very small, the media can not have a little bit of slag. In case of this situation, it is best to install a filter in front of the valve, to ensure the smooth through the media. With the use of the positioning of the regulator valve, locator work is not normal, and its gas pipeline orifice blockage is the most common failure. Therefore, when working with a locator, must be a good source of gas, the usual way is to install air filter pressure relief valve on the gas supply pipeline in front of the locator
4. Increase the throttle gap method
Such as the medium of solid particles or pipe was washed away with things such as welding slag and rust because of throttling mouth caused by congestion, stuck, such as failure, use of clearance throttle throttle: throttle area for windows, open class spool, sleeve, due to the cutting area to focus rather than circular distribution, the fault can easily were excluded. If you are single, two seat piston shaped spool valve can be changed to "core V" shaped mouth, or into the sleeve valve. For example, a chemical plant often have a stuck valve seat, recommended to use the sleeve valve, the problem is resolved immediately.
5. Medium erosion method
The use of the medium itself, the erosion of energy, washing and taking away the easy precipitation, easy to plug things, so as to improve the valve's anti blocking function. Common methods are: (1) converted to flow using the closed type; (2) with streamlined body; 3 orifice placed the scour the most powerful office. Using this method, we should pay attention to improve the erosion resistance of throttling materials.
6. Through to the angle method
Through S flow, the flow path is complex, the upper and lower chamber dead zone, which provides a place for the precipitation of the medium. Angle shaped connection, the media is like flowing through 90 degrees bend, scour performance is good, the dead zone is small, easy to design flow line. Therefore, the use of straight through the control valve can be changed into a slight blockage when the use of angle valve
7. For the steam pipe sleeve valve, if the spool and sleeve gap is too small, or use different materials, is likely to due to different coefficients of expansion and the death of calories. You can increase the gap in the processing time (to meet the flow control requirements as the premise), in order to prevent the occurrence of similar cases.
