What Exactly Affects the Valve Seal?
What exactly affects the valve seal? Let's see it in this article.
1. The structure of the valve seal
Under the change in air temperature or sealing force, the structure of the sealing pair will change. These changes will harm and change the mutual force between the sealing pair, and then it will reduce the performance of the valve seal. Therefore, when we choose the seal, it is necessary to choose the seal with elastic deformation. At the same time, we also need to pay attention to the width of the sealing surface. The reason is that the contact surface of the sealing pair can not be completely consistent. When the width of the sealing surface increases, the sealing interaction force is required to increase.
2. The pressure of the valve sealing surface
The specific pressure of the sealing surface endangers the sealing performance of valves and the service life of valves. Therefore, the specific pressure of the sealing surface is also a very important factor. Under the same conditions, too much specific pressure will cause valve damage, but too little specific pressure will cause valve leakage. Therefore, we need to take full account of the specific pressure in the design.
3. Physical properties of the valve medium
The physical properties of the medium also harm the sealing performance of the valve. These physical properties include air temperature, viscosity and surface water absorption. The temperature change not only endangers the relaxation of the sealing pair and the change in the size of the parts, but also has an inseparable relationship with the viscosity of the gas. The viscosity of gas increases or decreases with increasing or decreasing temperature.
Therefore, in order to reduce the harmful degree of air temperature to the sealing performance of the valve, we should design the elastic valve seat and other heat compensatory valves in the design of the sealing pair. Viscosity is related to the permeability of a fluid. The greater the viscosity is, the lower the permeability of the fluid in the same conditions. Surface water absorption refers to the removal of a thin film on a metal surface. Because this layer is a very thin oil film, it will destroy the surface water absorption, resulting in the blockage of the fluid channel.
4. Quality of the valve seal pair
The quality of the sealing pair mainly refers to the selection, matching and manufacturing accuracy of the materials. For example, the disc fits well with the seat sealing surface to improve tightness. The characteristic of circular waviness is that its maze sealing performance is good. Valve leakage is very common in life and production. It will cause the waste or bring danger to life, such as tap water valve leakage. It also will lead to serious consequences, such as the chemical industry's toxic, harmful, flammable, explosive and corrosive dielectric leakage, etc. It threatens personal safety, property safety and environmental pollution. The valve that depends on the external rotary drive to open and close is designed with a sealing device. It is used to install a certain number of packing rings in the packing culvert to achieve the sealing effect.
1. The structure of the valve seal
Under the change in air temperature or sealing force, the structure of the sealing pair will change. These changes will harm and change the mutual force between the sealing pair, and then it will reduce the performance of the valve seal. Therefore, when we choose the seal, it is necessary to choose the seal with elastic deformation. At the same time, we also need to pay attention to the width of the sealing surface. The reason is that the contact surface of the sealing pair can not be completely consistent. When the width of the sealing surface increases, the sealing interaction force is required to increase.
2. The pressure of the valve sealing surface
The specific pressure of the sealing surface endangers the sealing performance of valves and the service life of valves. Therefore, the specific pressure of the sealing surface is also a very important factor. Under the same conditions, too much specific pressure will cause valve damage, but too little specific pressure will cause valve leakage. Therefore, we need to take full account of the specific pressure in the design.
3. Physical properties of the valve medium
The physical properties of the medium also harm the sealing performance of the valve. These physical properties include air temperature, viscosity and surface water absorption. The temperature change not only endangers the relaxation of the sealing pair and the change in the size of the parts, but also has an inseparable relationship with the viscosity of the gas. The viscosity of gas increases or decreases with increasing or decreasing temperature.
Therefore, in order to reduce the harmful degree of air temperature to the sealing performance of the valve, we should design the elastic valve seat and other heat compensatory valves in the design of the sealing pair. Viscosity is related to the permeability of a fluid. The greater the viscosity is, the lower the permeability of the fluid in the same conditions. Surface water absorption refers to the removal of a thin film on a metal surface. Because this layer is a very thin oil film, it will destroy the surface water absorption, resulting in the blockage of the fluid channel.
4. Quality of the valve seal pair
The quality of the sealing pair mainly refers to the selection, matching and manufacturing accuracy of the materials. For example, the disc fits well with the seat sealing surface to improve tightness. The characteristic of circular waviness is that its maze sealing performance is good. Valve leakage is very common in life and production. It will cause the waste or bring danger to life, such as tap water valve leakage. It also will lead to serious consequences, such as the chemical industry's toxic, harmful, flammable, explosive and corrosive dielectric leakage, etc. It threatens personal safety, property safety and environmental pollution. The valve that depends on the external rotary drive to open and close is designed with a sealing device. It is used to install a certain number of packing rings in the packing culvert to achieve the sealing effect.
