The Industrial Valves is used to open and close, control, adjust and control the medium flow parameters ( Temperature, pressure and flow) Piping accessories. According to its function, can be divided into the cut-off valve, check Industrial Valves, regulating valve, etc. Can be used to control air, water, steam, all kinds of corrosive medium, mud, oil, liquid metal and radioactive medium such as various types of fluid flow. according to the material is divided into iron valves, cast steel valves, stainless steel valves, 201, 304, 316, etc. ) Molybdenum chrome vanadium steel, chrome molybdenum steel valves valve, dual phase steel valves, plastic valves, non-standard custom-made valves, etc. In the process of the use of the valve, sealing surface damage is a common problem, analyze the failure reasons of sealing surface for you: 1, mechanical damage, sealing surface in the open and close before I will produce the damage such as scratch, bruised, crowded injury. Between the sealing surface, under the action of high temperature and high pressure permeable leakage occurred atoms, produce adhesion phenomenon. When the two seal face each other while moving, adhesion pull to tear easily. Sealing surface coarse degree is higher, this kind of phenomenon occurs more easily. In the process of the valve in the closed, the disc in the process of return will touch wounded and squeeze sealing surface, make local sealing surface wear or indentation. 2, medium erosion, it is a medium activity on sealing surface wear, flushing, the results of the cavitation. Medium under a certain speed, variety of fine particle in medium resistance to break the seal face, make its local damage, high-speed medium directly flush seal face, make its local damage, medium mixed flow and partial vaporization, angry bubble production blasting shock sealing surface, cause local damage. Alternative action medium of erosion and chemical erosion, sealing surface erosion will be strong. 3, electrochemical erosion, sealing surface contact each other, sealing surface contact with closed body and the body and the medium concentration, poor oxygen concentration, will generate an electrical potential difference, electrochemical etching, the anode side of the sealing surface erosion. 4 chemical corrosion, medium, medium near the sealing surface in the case of no current, medium directly with the sealing surface chemistry, erosion seal face. 5, installation is not lack of maintenance in operation of the sealing surface of valve to operate, in spite of premature damage the sealing surface. 6 damage caused by, improper selection and manipulation. Mainly manifested in not choose valves according to the working condition of the premise, the block valves when the throttle Industrial Valves is used, lead to too much closed pressure and closed too quickly or closed lax, the sealing surface by erosion and wear. 7, sealing surface machining quality is bad, mainly displays in the sealing surface defects such as cracks, porosity and clamp design, because of the overlaying welding and heat treatment specification improper selection and bad manipulation caused by overlaying welding and heat treatment process, sealing surface hard through the high or low, because of the differences caused by error or improper heat treatment, select material sealing surface hardness uneven, no corrosion, mainly because of the underlying metal in welding process blow to the above, to dilute the sealing surface of alloy composition.
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