Here are a few common methods of maintenance:
1. Disconnecting valve for cleaning pipeline welding slag, rust, slag, etc. will be in the throttle, the wizard parts, under the valve cover balance hole caused by blocked or stuck, make the spool surface, surface oriented production strain and scratches, sealing surface indentation. This phenomenon often occurs in the construction period and put into operation after the initial repair, is the most common faults. Encounter this situation, we must discharge to open the valve for cleaning, remove residue, such as the sealing surface from damage should be grinding, also the bottom cover is opened, to flush from the balance fall into the hole under the valve cover of the residue, and pipeline for flushing. Before operation, to adjust valve fully open, then the medium flows into the normal operation after a period of time.
2. After gas or steam flushing the ordinary valve, some easy to precipitate containing solid particles of the medium often in the throttle, oriented at the resulting block, could be the end of the lower valve cover plug is opened, external erosion gases or steam pipeline. When a blockage or stuck, open the external gas or steam valve, you can not move the valve in the case of the completion of the flushing work, so that the normal operation of the valve.
3. Installation of pipe filter for small caliber valve, especially micro flow control valve, the throttle gap is very small, the media can not have a little 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.
Control valve 4 to switch to other forms such as going through a single, double seat valve into the sleeve valve, angle type valve etc.. Single seat valve throttle area and circumferential distribution, small gap, easy to plug stuck; sleeve valve throttle area and centralized distribution, is in the shape of a window, large gap, residue easily through; through the valve for inverted S-shaped flow path, lower chamber and dead, as the medium precipitation to provide a place; angle valve for inverted L shape flow path, like streaming media over 90 elbow, good self-cleaning performance, not easy to plug deposition.
