3. Sealing principle of leakage channel valve sealing is composed of two parts, roughness, which is composed of the unevenness spread on the waveform surface and the waviness of the distance between the peaks. Under the condition that the elastic force of most Chinese metal data is low, we need a higher requirement for the compression force of metal data, that is, it should exceed its elasticity, if we want to get to the sealing condition. Therefore, in the design of the valve, the sealing pair combined with a certain hardness difference to match, under the effect of pressure, there will be a certain degree of plastic deformation sealing effect. If the sealing surface is all metal material, then the uneven convex points will appear the earliest, and the plastic deformation of these uneven convex points can be made with only a small load at the beginning. When the touch surface increases, the appearance of the uneven will become plastic - elastic deformation. Then the roughness of the two surfaces in the concave place will exist. When the load that can cause serious plastic deformation of the underlying data needs to be applied, and the two surfaces touch closely, the remaining paths can be closed along the continuous line and the ring direction.
4. The valve seal pair the valve seal pair is the part of the seat and the closing part that closes when they touch each other. The metal sealing surface is prone to damage from clamping media, media corrosion, wear particles, cavitation and erosion during use. Such as wear particles. If the wear particles are less uneven than the appearance, the appearance accuracy will be improved when the sealing surface is run in, and will not become bad. On the contrary, it will make the surface accuracy worse. Therefore, when selecting wear particles, we should comprehensively consider their information, working conditions, lubricity and corrosion status of the sealing surface. Like wear particles, when we select seals, we should comprehensively consider the various elements that affect their function, so as to play the function of leakage prevention. Therefore, it is necessary to select those corrosion resistance, abrasion resistance and erosion resistance data. Otherwise, short of any of the requirements, will make its sealing function is greatly reduced.
