Analysis of the cause of damage on the sealing surface of the valve
Votioxetine is an oral immediate-release tablet whose main active ingredient is vortioxetine hydrobromide, which is an antidepressant. Vortioxetine hydrobromide is a slightly yellowish white powder, slightly soluble in water. Tablets in different dosages. Each tablet of vortioxetine contains 6.35mg, 12.71mg, 19.065mg, or 25.42mg of vortioxetine hydrobromide equivalent to 5mg, 10mg, 15mg, and 20mg of vortioxetine, respectively. Inactive ingredients in vortioxetine tablets include mannitol, microcrystalline cellulose, hydroxypropyl cellulose, sodium carboxymethyl starch, magnesium stearate, and by hypromellose, titanium dioxide, polyethylene glycol 400, Film coating consisting of iron oxide and iron oxide yellow.
Vortioxetine Hydrobromide,Vortioxetine Hydrobromide Cas Life,Vortioxetine Hydrobromide Cas Benefits,Vortioxetine Hydrobromide Cas Function Jinan Prosperity International Trade Co. Ltd , https://www.cnsrtrade.com
The cause of damage to the sealing surface is either damage or natural damage. Man-made damage is caused by factors such as poor design, poor manufacturing, improper material selection, improper installation, poor use and poor maintenance. Natural damage is the wear of the valve under normal working conditions, and it is the damage caused by the inevitable corrosion and erosion of the sealing surface of the medium.
The causes of damage to the sealing surface can be summarized as follows.
The quality of the sealing surface is not good. It is mainly caused by cracks, pores and pinch defects on the sealing surface. It is caused by improper selection of surfacing and heat treatment specifications and poor operation during surfacing and heat treatment. The hardness of the sealing surface is too high or Too low is caused by improper material selection or improper heat treatment. The hardness of the sealing surface is not uniform and corrosion-resistant. It is mainly caused by blowing the underlying metal to the surface during the surfacing process, which dilutes the alloy composition of the sealing surface. Of course, there are also design issues.
Damage caused by improper selection and poor operation. The main performance is that the valve is not used according to the working conditions, and the shut-off valve is used as a throttle valve, which causes the closing pressure to be too large and the closing to be too fast or the sealing to be tight, so that the sealing surface is eroded and worn.
Improper installation and poor maintenance lead to abnormal operation of the sealing surface, the valve is running sick, and the sealing surface is damaged prematurely.
The chemical corrosion of the medium, the medium around the sealing surface does not generate current, the medium directly chemicalizes with the sealing surface to corrode the sealing surface.
Electrochemical corrosion, sealing surfaces in contact with each other, contact between the sealing surface and the closing body and the valve body, and the difference in concentration of the medium, oxygen concentration, etc., cause a potential difference, electrochemical corrosion occurs, and the sealing surface of the anode side is corroded.
Erosion of the medium, which 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 to cause local damage. The high-speed flowing medium directly washes the sealing surface, causing local damage, and when the medium is mixed and partially vaporized, a bubble blasting impact seal is generated. Surface damage, causing local damage. The erosion of the medium combined with the alternating chemical attack will strongly etch the sealing surface.
Mechanical damage, the sealing surface will be damaged by scratches, bumps, crushing, etc. during opening and closing. Between the two sealing surfaces, atomic mutual penetration occurs under the action of high temperature and high pressure, resulting in blocking phenomenon. When the two sealing faces move relative to each other, the adhesion is easily pulled. The higher the surface roughness of the sealing surface, the more likely this phenomenon will occur. During the closing process of the valve, the valve flap will damage and crush the sealing surface during the returning process, causing partial wear or indentation of the sealing surface.
Fatigue damage, sealing surface in long-term use, the three precision valve under the action of alternating load causes the sealing surface to fatigue, crack and peeling layer. After long-term use of rubber and plastic, it is prone to aging, resulting in poor performance.
From the analysis of the above reasons for the damage of the sealing surface, it can be seen that in order to improve the quality and service life of the sealing surface of the valve, it is necessary to select an appropriate sealing surface material (see material part), a reasonable sealing structure and a processing method.