Rembug babagan sebab kerusakan permukaan segel

Katupyaiku aksesoris pipa sing digunakake kanggo mbukak lan nutup pipa, ngontrol aliran, nyetel lan ngontrol parameter (suhu, tekanan lan aliran) media sing ngirim. Saka katup sing paling gampang ditutup nganti macem-macem katup sing digunakake ing sistem kontrol otomatis sing kompleks banget, ana macem-macem jinis lan spesifikasi. Dhiameter nominal katup kalebu katup instrumen sing cilik banget nganti katup pipa industri kanthi diameter nganti 10m. Bisa digunakake kanggo ngontrol aliran macem-macem jinis cairan kayata banyu, uap, minyak, gas, lumpur, macem-macem media korosif, logam cair lan cairan radioaktif. Tekanan kerja katup bisa saka 0,0013MPa nganti 1000MPa tekanan ultra-dhuwur, lan suhu kerja bisa dadi c-270 "suhu ultra-endhek nganti suhu 1430". Ingkatup sealing surface is often damaged during the use of the katup, and the damage will cause internal leakage. Why does this happen? There are many aspects to understand here, let's take a look together.
Kerusakan mekanik, permukaan panyegelan bakal rusak amarga goresan, memar, remuk, lan liya-liyane nalika mbukak lan nutup. Antarane rong permukaan panyegelan, kanthi tumindak suhu dhuwur lan tekanan dhuwur, atom-atom kasebut nembus lan silih sesat, nyebabake adhesi. Nalika loro permukaan segel kasebut pindhah menyang adhepan, adhesi kasebut gampang robek. Semakin dhuwur permukaan permukaan panyegelan, kemungkinan kedadeyan iki bakal kedadeyan. Lumahing segel sakakatup will be scratched and crushed during the closing process of the katup and the katupclack sajrone proses kursi maneh, nyebabake nyandhang lokal utawa lekukan ing permukaan segel.
Erosi medium minangka asil nyandhang, ngumbah lan kavitasi ing permukaan penyegel nalika medium aktif. Nalika medium kanthi kacepetan tartamtu, partikel alus sing ngambang ing medium kasebut ngganggu permukaan panyegelan, nyebabake kerusakan lokal. Media obah kanthi kecepatan tinggi langsung ngumbah permukaan sing disegel lan nyebabake kerusakan lokal. Nalika medium dicampur lan sebagian diuap, gelembung udara lan jeblugan bakal digawe. Pangaruh ing permukaan segel, nyebabake kerusakan lokal. Erosi medium lan tumindak sulih erosi kimia bakal nggawe permukaan segel.
Electrochemical corrosion, the contact between the sealing surfaces, the contact between the sealing surface and the sealing body and the katup body, the concentration difference of the medium, the oxygen concentration and other reasons, will produce a potential difference, electrochemical corrosion will occur, and the sealing surface of the anode will be corroded.
The chemical corrosion of the medium, the medium near the sealing surface does not produce current, the medium directly chemically interacts with the sealing surface, corroding the sealing surface. Improper installation and poor maintenance have caused the sealing surface to work abnormally, and the katup runs ill, which prematurely damages the sealing surface.
Kerusakan amarga pilihan sing salah lan operasi sing kurang apik. Manifestasi utama yaikukatup is not selected according to the working conditions, and the shutoff katup is used as a throttle katup, which leads to excessive closing specific pressure and closing too fast or not tightly, causing the sealing surface to be eroded and worn. The processing quality of the sealing surface is not good, mainly manifested in the defects such as cracks, pores and ballast on the sealing surface, which are caused by improper selection of surfacing and heat treatment specifications and poor manipulation during surfacing and heat treatment. The sealing surface is too hard. Or too low, due to the wrong material selection or improper heat treatment. The sealing surface has uneven hardness and is not resistant to corrosion, mainly because the underlying metal is blown to it during the surfacing process, which dilutes the alloy composition of the sealing surface. of. Of course, there are also design issues.