The valves used in the pipeline, a wide variety of different structure, and the most likely to damage the pipeline accessories, the maintenance of each kind of valve should be based on the specific structure of the.
The valve body and the valve cover of the valve body and the cover is the most external closed shell. Used to withstand the pressure of the media, the additional force during operation, other parts of the valve weight long, and the connection of the flange or the thread of the tightening force. The valve body and the valve cover requirements have a certain strength and stiffness, damage is mainly medium corrosion, erosion and mechanical damage caused by local defects, when due to corrosion or erosion caused by wall thinning that affect the strength or stiffness, can not be repaired, should be replaced.
When maintenance, the valve body and the valve cover should first carry on the hydraulic strength test, then water, compressed air, kerosene or other medium to test its tightness. Valve body, valve cover defects are generally used to repair the PV approach to repair, according to the different materials used in the appropriate welding rod and welding process. For the force is not, the temperature is not high, also can be seen in the case of ring resin and other types of dry knot agent for bonding. Welding shall be carried out prior to the defect of metal clear clean, repair welding shall be carried out after the inspection and repair. Repair by welding, must pay attention, do not allow the use of welding defects to melting metal by welding.