Mechanical damage, the sealing surface in the opening and closing over we will have scratches, bumps, Jishang other damage. Between the two sealing surface, under high temperature and pressure of the leaking atomic mutual penetration, resulting in adhesion phenomena. When moving between the two sealing surface, the adhesion at pull tear easily. Higher the degree of surface sealing surface coarse and heavy, this phenomenon occurs more easily. Valve in a closed process, the valve flap in the back seat during the sealing surface will be bumps and Jishang make partial sealing surface wear or indentation.

    Medium erosion, it is the media activities of the sealing surface wear, wash, cavitation results. Medium at a certain speed, medium grained pelagic sealing surface inconsistent offense, it caused partial damage, high-speed direct flushing of media activities, the sealing surface, it causes local damage, and partial vaporization of mixed media, the yield anger bubble burst the impact of the sealing surface of the surface, causing local damage. Chemical attack combined with the erosion of media alternation will be a strong erosion of the sealing surface.

    Electrochemical corrosion, contact between the sealing surface, sealing surface and the closure body and body contact, and media concentration difference, oxygen concentration and poor reasons, will have a potential difference, the electrochemical corrosion, resulting in the anode side of the sealing surface is eroded.

    The chemical erosion of the media, the media near the sealing surface does not produce current in the case of the media directly with the sealing surface chemical reaction and corrosion of the sealing surface.

    Installation errors and poor maintenance led to the sealing surface is not working properly, the valve operation ill premature damage to the sealing surface.

    Improper selection and manipulation of the damage caused by bad. Mainly in the absence of the prerequisite conditions selected by the valve, use the cut-off valve when the throttle valve, leading to closure than the pressure is too large and too fast or closed closed lax, so that the sealing surface by erosion and wear.

    Sealing surface of poor quality, mainly in the sealing surface cracks, holes and other defects clip ballast, surfacing and heat treatment specifications because of the improper selection and manipulation of the process of welding and heat treatment caused by bad, the sealing surface through the high hard or too low, because of differences in selection caused by error or improper heat treatment, hardness of the sealing surface uneven, intolerance erosion, mainly because the metal in the welding process will be blown to the top to the bottom, and diluted the sealing surface of the alloy composition caused by The. Of course, there is also the subject of design.

   Causes of damagee caused by the sealing surface, can be summarized as follows several.

    Some causes of damage the sealing surface for the two kinds of damage and natural damage. Man-made damage, because of ill design, manufacturing is not fine, improper selection, installation errors, the use of poor and inadequate maintenance of such factors. Natural damage, is under normal operation the valve wear is inevitable medium on the sealing surface erosion and erosion and other damage.