What are the causes of instrument valve blockage

What are the causes of instrument valve blockage
When the instrument valve is installed in industrial activities, the mechanical impurities in the oil or the colloid, asphalt, carbon residue and other pollutants in the oxidation precipitation will accumulate in the throttle clearance of the instrument valve. Due to the generation of charged polarizing molecules after oil aging or extrusion, there is potential difference on the metal surface of throttling gap, so the molecular structure of electric polarization is absorbed to the surface of gap, resulting in a solid boundary layer of circulating fan, which is generally 5 ~ 8 in thickness μ m. Therefore, the size of throttle clearance of instrument valve is endangered.
When the left and right deposits and adsorbates reach a certain thickness, they will be eroded by the flowing liquid, and then attached to the valve port of the instrument again. In this way, the circulation is repeated, and the pulsation of the total flow is produced. When the pressure difference of instrument valve port is very large, because the temperature of instrument valve port is high, the level of liquid extrusion molding is improved, and the stainless steel passivation is easy to produce potential difference due to friction effect, so it is very easy to cause blockage when the pressure difference is large.