Analysis of the Cause of Valve Sealing Surface Material Damage

Regulating valve closure of the sealing surface is one of the important valve face, the material is reasonable and its quality, a direct impact on the function and life of the control valve. Regulating valve sealing surface of the working conditions As the use of regulating valve is very wide, so the sealing surface of the working conditions vary widely. The working pressure can be from vacuum to ultra-high pressure; working temperature can range from -296 ~ 816 ℃, in some cases the working temperature can reach 1200 ℃; working medium from non-corrosive media to various acid-base and other corrosive media. From the sealing surface of the force situation, it squeezed pressure, shear force; from the tribological point of view, abrasive wear, corrosion wear, surface fatigue wear, erosion and so on. Therefore, it should be based on different working conditions, choose the appropriate sealing surface material. (1) Abrasive wear This is wear that occurs when a rough hard surface slides over a soft surface. Hard material pressed into the softer surface of the material, wear on the soft surface when sliding. Hard material pressed into the softer material surface, the surface will be in contact with a tiny trench. The material dropped by this groove is pushed away from the surface of the object in the form of debris or loose particles. Vortex flowmeter (2) abrasion metal surface erosion, resulting in a layer of oxide. This layer of oxide is usually covered in the corroded parts, thus slowing the further corrosion of the metal. However, if sliding occurs, the surface oxide is removed and the exposed metal surface is further eroded. (3) Surface Fatigue Wear Repeated cycles of loading and unloading can cause fatigue cracks on the surface or under the surface, forming fragments and pits on the surface, eventually resulting in surface destruction. (4) Erosion material damage is generated by the impact of sharp particles on the surface of the object. It is similar to abrasive wear, but the surface is rough. (5) Scratch Scratch is the relative movement of sealing surface, the material due to friction caused by damage. More keyword search: Regulating valve