Result The causes of the damage of valve sealing surface

Mechanical damage, we will produce in the open-close sealing surface abrasions, bruising, crushing and other damage.Between the two sealing surface, in the mutual penetration of the atom under the action of high temperature and high pressure seepage, resulting in the phenomenon of adhesion.When the two seal face mutual moving, not easy to pull apart.The higher the degree of the seal surface coarse, this phenomenon is more apt to happen.The valve is in the closed process, the valve flap in the back seat sealing surface in the process of bruising and crushing, to make the sealing surface wear and the indentation.

The erosion of the medium, it is the wear on the sealing surface of the activities of the media, flushing, the result of cavitation.Medium at a certain speed, Fine-grained subject to conflict with the sealing surface of medium planktonic, So that it caused local damage, High-speed activities of the sealing surface of medium washing, So that it caused local damage, when the medium mixed-flow and partial vaporization, and angry foam sealing surface of the impact of blasting surface, causing local damage.Alternating erosion and chemical erosion of the role of the media, strongly sealing surface of erosion.

Electrochemical erosion, The sealing surface contact with each other, The contact with a closed body and the valve sealing surface and the concentration difference of medium, Oxygen concentration and so on, will have the potential, electrochemical erosion, resulting in the erosion of the sealing surface of the anode side.

Chemical corrosion of the medium, near the sealing surface of medium in the current circumstances, is directly related to the chemical properties of the sealing surface of medium, sealing surface of erosion.

Installation is not correct and poor maintenance led to the sealing surface is not working properly, the operation of valve disease, premature damage to the sealing surface of the earth.

Improper selection and manipulation of damage caused by the bad.Is mainly manifested in the lack of operating a prerequisite for the selection of valves, Take the use of cut-off valve as throttle, resulting in the closure pressure is too large and closed too fast or corrode the sealing surface by erosion and wear.

The sealing surface machining quality is not good, There are mainly manifested in the sealing surface crack, The defects such as porosity and slag inclusion Because of the improper selection of welding and heat treatment specification and manipulation in the process of overlaying welding and heat treatment caused, Sealing surface of hard through the high or too low, Because of the differences in the selection of error or improper heat treatment, Uneven hardness of seal face, not resistant to erosion, largely because of the underlying metal in welding process to come, caused by dilute the sealing surface of alloy composition.Of course, there's also the title of the design.

To cause the damage cause of sealing surface, can be summarized in the following.

Some of the reasons for the damage and the damage to the sealing surface of two kinds of natural damage.Man-made damage, because of the design, manufacturing is not fine improper selection installation is not correct, use the good and poor maintenance caused by such factors.Natural damage to valves the wear of the normal working conditions, is a medium on the sealing surface of the inevitable damage caused by erosion and erosion and so on.