What is affecting the valve seal problem

1. valve seal structure

Under the change of air temperature or sealing force, the structure of sealing pair will change. And these changes will harm and change the seal pair between the interaction force, and then reduce the performance of the valve seal. Therefore, when choosing seals, we must choose seals with elastic deformation. At the same time, it is also necessary 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, it is necessary to increase the interaction force required by the sealing.

2. Specific pressure of valve sealing surface

The specific pressure of the sealing surface is harmful to the sealing performance and the service life of the valve. Therefore, the sealing surface pressure 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 should fully consider the specific pressure in the design.

3. the physical properties of the valve medium

The physical properties of the medium can also compromise valve seal performance. These physical properties include temperature, viscosity, and surface water absorption. The change of air temperature not only harms the relaxation of the sealing pair and 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 the increase or decrease of temperature.

Therefore, in order to reduce the damage degree of air temperature to the sealing performance of the valve, we should design the sealing pair into elastic seat and other valves with heat compensation. Viscosity is related to the permeability of a fluid. Under the same conditions, the greater the viscosity, the less permeable the fluid. Surface water absorption refers to the removal of a thin film on a metal surface. Because of this very thin film of oil, it will destroy the water absorption of the surface, leading to blocked fluid channels.

4. the quality of the valve seal pair

Seal quality mainly refers to the selection of materials, matching, manufacturing accuracy on the check. For example, the disc fits well with the seat sealing surface to improve sealing. Toroidal waviness more characteristics, make its sealing performance is good, the valve leakage is common in the life and production, light can cause waste, or bring danger to life, such as tap water valve leak, or causing serious consequences, such as the chemical industry the poisonous and harmful, inflammable, explosive and corrosive medium leakage in the nature of, Serious accidents that threaten personal safety, property safety and environmental pollution. A valve that depends on external rotation drive to open and close is designed with a sealing device that is used in the packing culvert with a certain number of packing rings to achieve the sealing effect.