Mechanical damage, the 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 regulating Industrial Valves in the closed, the disc in the process of return will touch wounded and squeeze sealing surface, make local sealing surface wear or indentation. Medium erosion, it is a medium activity when the results of the sealing surface wear, flushing, 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. Electrochemical erosion, sealing surface contact each other, the 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. Medium chemical erosion, sealing surface near the medium in the case of no current, medium directly with the sealing surface chemistry, erosion seal face. Installation is not lack of maintenance in operation of the sealing surface of valve to operate, in spite of premature damage the sealing surface. Damage caused by improper selection and bad 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. 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 overlaying welding and heat treatment process control, caused by the bad sealing face 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. There are, of course, the topic of design. Causes of the sealing surface damage, can be summarized as the following several kinds. The cause of the sealing surface damage someone for damage and two kinds of natural damage. Artificial damage, because of bad design, the manufacture is not pure, improper material selection, installation, use caused by factors such as bad and lack of maintenance. Is a natural damage, the Industrial Valves under normal working condition of wear and tear, is the medium of seal face of the inevitable erosion and erosion damage.
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