seal is to avoid leakage, then the basic principle of the valve sealing and to avoid the leakage of scientific research. Key elements of the leakage has two, one is the key to harm the sealing performance of elements, namely the seal in the middle has a gap, the other is seal on both sides of the middle has a pressure difference. sealing principle is also as a liquid sealing, sealing, leakage of the gas channel of basic principle of seal and valve seal from four aspects to analyze.

1, the liquid sealing

the sealing of the liquid is carried out according to the viscosity of the liquid and surface support. When the valve is leaking capillaries filled with gas, under the condition of surface support is likely to develop resistance to liquid, or liquid is introduced into the capillaries. That creates a rounded corners. When the phase rounded corners is less than 90 & deg; , the liquid will be introduced in the capillaries, it will leak.

because of the leak depends on the different characteristics of the material. Experiment with different substances, in the standard under the same condition, will get different results. Can tap water, gas or gasoline, etc. And when the phase rounded corners than 90 & deg; , also can produce leaks. With metal material on the surface of vegetable oils or fruit wax plastic film. Once the dissolve plastic film on the surface of the drop, the characteristics of the metal material surface is changed, the original is liquid resistance, will invade wet surface, produce leaks. For the above situation, based on the poisson formula, can in the condition of lower capillary diameter and material viscosity is very big, to complete to avoid leakage or purpose to reduce leakage.

2, gas sealing

based on poisson formula, molecular structure of gas tightness and vapour and gas viscosity. Leak and the length of the capillary and the gas viscosity in inverse ratio, and the diameter of the capillaries and driving force are related. When the diameter of the capillaries and gas mean playability of the same molecular structure, gas molecular structure will with random thermal motion of the fluid to the capillaries.

as a result, the material must be the effect of tap water can be sealed, with a gas or vapour can not have the effect of sealing. Even if everyone according to plastic deformation method, the capillary diameter down to gas molecular structure, of the following is still can not stop gas liquid. Reason depends on gas can still according to the metal materials to spread outside the wall. Gas so we are doing the experiment, be sure to experiment more stringent than those of liquids.

3, seal the basic principle of leak path

the valve seal by spreading on the surface of the wave type, no spacing between flatness and wave soldering wave grain degree of surface roughness of part 2. In China most malleable metal composite material judgment under the condition of low, if want to do the sealing situation, it must be the tightening force of metal composite material to improve some of the provisions of the tightening force of the raw materials for than its ductility.

as a result, in this for the Industrial Valves design, sealing pair matching by certain intensity difference fusion, under the effect of stress at work, will cause a certain level of plastic deformation of the sealing effect. If seal surface is full of metal composite materials, so surface leveling of convex point will begin to appear, you start with a smaller load can make the leveling of the convex point caused by plastic deformation. When the surface expansion, not on the surface of the leveling - will become a plastic deformation Elastic deformation. At this time in the cavity of double surface roughness will be there. Must release can make the underlying raw materials cause more severe plastic deformation load, and push the surface touch are inseparable, along the line and axillary Angle position can make the remain the diameter of sealing.

4, valve seal

high-pressure gate and turn off the valve seal parts in touch with each other to carry out the part of a turn off. Metal sealing surface in the application process, it is very vulnerable to clip into the material, material erosion and damage to the particulate matter, the harm of cavitation and flushing. Such as damage to particulate matter. If damaged particles than the surface of the flatness is small, the sealing surface period, its surface accuracy improvement will be achieved, and it is not easy to be affected. In turn, will make the surface accuracy is affected.

so, when choosing damage particulate matter to the comprehensive considering its raw materials, work status, wettability and the sealing surface of elements such as etching condition. Like a damaged particles, when choosing the seals, we want to comprehensive considering multiple factors endangering its features, can be the role of containment. Therefore, be sure to select the corrosion resistance, abrasion resistance and resistance to washing of raw materials. Otherwise, all the lack of a regulation, can make substantial decrease in its sealing performance.

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