The lobe pump is a volumetric pump, widely used in petrochemical, environmental protection, slurry transfer, cleaning the bottom of the tank, underground high speed rail sewage, municipal sewage treatment, farm discharge transfer, food waste treatment and other fields. So in the process of using, encounter lobe pump regulating valve clogging what to do? Today Ace lobe pump's will tell you.
Often occur in the new commissioning system and the initial commissioning after major repairs, pipeline welding slag, rust, slag, etc. in the throttle port, guide parts, the lower valve cover balance hole caused by blockage or stuck so that the spool surface, guide surface to produce strains and scratches, seal surface indentation, etc.. This is the most common fault. In this case, it must be unloaded for cleaning, to remove the slag, such as sealing surface damage should also be ground; at the same time the bottom plug open, to flush out the slag from the balance hole into the lower valve cover, and flush the pipeline. Before commissioning, let the regulating valve fully open, the medium flow for a period of time and then into normal operation.
2、Installation of pipe filter method
For small diameter control valves, especially ultra-small flow control valves, the throttle gap is particularly small, the media can not have a little slag. In case of blockage, it is best to install a filter on the pipeline in front of the valve to ensure the smooth passage of the medium. With the positioner to use the regulating valve, the positioner does not work properly, its airway throttle blockage is the most common fault. Therefore, when working with a positioner, the air source must be dealt with. The usual method is to install an air filtering pressure reducing valve on the air source line in front of the positioner.
3、Media flushing method
The use of the medium's own flushing energy, flush and take away easy to precipitate, easy to block things, so as to improve the valve's anti-blocking function. Common methods are: change to flow closed type use; using streamline valve body; the throttle is placed at the most powerful flushing, the use of this method to improve the throttle parts of the material resistance to erosion.
4、External flushing method
For some easy to precipitate, contains solid particles of the media using ordinary valve regulation, often in the throttle, guide at the blockage, can be in the lower valve cover at the bottom plug external flushing gas and steam. When the valve becomes blocked or stuck, the external gas or steam valve can be opened to complete the flushing work without moving the regulating valve and make the valve operate normally.
5、Increasing the throttle gap method
Such as solid particles in the medium or the pipeline washed off the welding slag and rust caused by the failure of the throttle mouth blockage, jamming and other failures, can be replaced by a throttle clearance throttle area for the window, open class spool, sleeve, because of its throttle area concentrated rather than circumferential distribution, the failure can be easily removed. If it is a single, double-seated valve can be changed to a plunger-shaped spool to V-port spool, or into a sleeve valve, etc.