Causes of valve sealing surface damage
because the seal plays the role of cutting off and connecting, adjusting and distributing, separating and mixing media on the valve channel, the sealing surface is often corroded, eroded and worn by the media, which is very easy to be damaged.
there are two causes of sealing surface damage: man-made damage and natural damage. man made damage is caused by poor design, poor manufacturing, improper material selection, improper installation, poor use and poor maintenance. natural damage refers to the wear of the valve under normal working conditions and the damage caused by the inevitable corrosion and erosion of the medium on the sealing surface.
the causes of sealing surface damage can be summarized as follows:
the poor processing quality of the sealing surface is mainly reflected in the defects such as cracks, pores and slag inclusion on the sealing surface, which is caused by improper selection of surfacing and heat treatment specifications and poor operation in the process of surfacing and heat treatment. the hardness of the sealing surface is too high or too low, which is caused by incorrect material selection or improper heat treatment, uneven hardness and corrosion resistance of the sealing surface, it is mainly caused by blowing the bottom metal to the top in the surfacing process and diluting the alloy composition of the sealing surface. of course, there are also design problems.
damage caused by improper selection and poor operation. the main performance is that the valve is not selected according to the working conditions, and the block valve is used as a throttle valve, resulting in excessive closing specific pressure, too fast closing or lax closing, resulting in erosion and wear of the sealing surface.
improper installation and maintenance led to abnormal operation of the sealing surface, faulty operation of the valve and premature damage to the sealing surface.
chemical corrosion of the medium. under the condition that the medium around the sealing surface does not generate current, the medium directly plays a chemical role with the sealing surface and corrodes the sealing surface.
electrochemical corrosion, the contact between sealing surfaces, the contact between sealing surface and closing body and valve body, as well as the concentration difference of medium and oxygen concentration difference, will produce potential difference and electrochemical corrosion, resulting in the corrosion of the sealing surface on the anode side.
medium erosion is the result of wear, erosion and cavitation of the sealing surface when the medium flows. when the medium is at a certain speed, the floating fine particles in the medium collide with the sealing surface and cause local damage. the high-speed flowing medium directly washes the sealing surface and causes local damage. when the medium is mixed and partially vaporized, bubbles are generated to explode and impact the sealing surface, causing local damage. the alternating action of medium erosion and chemical corrosion will strongly etch the sealing surface.
mechanical damage: the sealing surface will be scratched, bumped and squeezed during opening and closing. between the two sealing surfaces, atoms penetrate each other under the action of high temperature and high pressure, resulting in adhesion. when the two sealing surfaces move each other, the adhesion is easy to tear. the higher the surface roughness of the sealing surface, the easier this phenomenon occurs. when the valve is closed and the valve disc is reseated, the sealing surface will be bruised and squeezed, resulting in local wear or indentation on the sealing surface.
fatigue damage, the sealing surface is in long-term use, and the sealing surface of sanjing valve is fatigued, cracked and stripped under the action of alternating load. after long-term use, rubber and plastics are prone to aging, resulting in poor performance.
from the above analysis of the damage causes of the sealing surface, it can be seen that in order to improve the quality and service life of the valve sealing surface, appropriate sealing surface materials (see materials), reasonable sealing structure and processing methods must be selected.
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Causes of valve sealing surface damage
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there are two causes of sealing surface damage: man-made damage and natural damage. man made damage is caused by poor design, poor manufacturing, improper material selection, improper installation, poor use and poor maintenance. natural damage refers to the wear of the valve under normal working conditions and the damage caused by the inevitable corrosion and erosion of the medium on the sealing surface.
the causes of sealing surface damage can be summarized as follows:
the poor processing quality of the sealing surface is mainly reflected in the defects such as cracks, pores and slag inclusion on the sealing surface, which is caused by improper selection of surfacing and heat treatment specifications and poor operation in the process of surfacing and heat treatment. the hardness of the sealing surface is too high or too low, which is caused by incorrect material selection or improper heat treatment, uneven hardness and corrosion resistance of the sealing surface, it is mainly caused by blowing the bottom metal to the top in the surfacing process and diluting the alloy composition of the sealing surface. of course, there are also design problems.
damage caused by improper selection and poor operation. the main performance is that the valve is not selected according to the working conditions, and the block valve is used as a throttle valve, resulting in excessive closing specific pressure, too fast closing or lax closing, resulting in erosion and wear of the sealing surface.
improper installation and maintenance led to abnormal operation of the sealing surface, faulty operation of the valve and premature damage to the sealing surface.
chemical corrosion of the medium. under the condition that the medium around the sealing surface does not generate current, the medium directly plays a chemical role with the sealing surface and corrodes the sealing surface.
electrochemical corrosion, the contact between sealing surfaces, the contact between sealing surface and closing body and valve body, as well as the concentration difference of medium and oxygen concentration difference, will produce potential difference and electrochemical corrosion, resulting in the corrosion of the sealing surface on the anode side.
medium erosion is the result of wear, erosion and cavitation of the sealing surface when the medium flows. when the medium is at a certain speed, the floating fine particles in the medium collide with the sealing surface and cause local damage. the high-speed flowing medium directly washes the sealing surface and causes local damage. when the medium is mixed and partially vaporized, bubbles are generated to explode and impact the sealing surface, causing local damage. the alternating action of medium erosion and chemical corrosion will strongly etch the sealing surface.
mechanical damage: the sealing surface will be scratched, bumped and squeezed during opening and closing. between the two sealing surfaces, atoms penetrate each other under the action of high temperature and high pressure, resulting in adhesion. when the two sealing surfaces move each other, the adhesion is easy to tear. the higher the surface roughness of the sealing surface, the easier this phenomenon occurs. when the valve is closed and the valve disc is reseated, the sealing surface will be bruised and squeezed, resulting in local wear or indentation on the sealing surface.
fatigue damage, the sealing surface is in long-term use, and the sealing surface of sanjing valve is fatigued, cracked and stripped under the action of alternating load. after long-term use, rubber and plastics are prone to aging, resulting in poor performance.
from the above analysis of the damage causes of the sealing surface, it can be seen that in order to improve the quality and service life of the valve sealing surface, appropriate sealing surface materials (see materials), reasonable sealing structure and processing methods must be selected.
电池材料含水率测定仪应用指标及读数
四气两尘微型气象站——环境监测的新型仪器
土壤团聚体分析仪的安装使用注意事项
窄线宽激光器有哪些特点
设备及管道绝热效果的测试与评价 - 表面温度计法和热流计法
Causes of valve sealing surface damage
注塑机械手的每日一更，
动物器械的分类有哪些
检测纸杯杯身挺度的重要仪器
气动高温球阀结构特点
融资8亿美元 Zoox打造全新无人驾驶出租车
耐高温风琴防护罩质量好坏怎么判断
PARKER派克柱塞泵
ST503E-A-250A-V-M1+ST522E电机综合保护器
中型水丸机丸剂的制作工艺，经验之谈
YQ9800系列过滤活塞式控制阀介绍
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想要导轨风琴防护罩保护好我们的机器 我们也要保护好它
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