What is the role of automobile valve seal
The main role of automobile valve seal is to ensure the close coordination between the valve and the valve seat to prevent gas leakage, so as to ensure the normal operation and performance of the engine.
Poorly sealed valves can cause a variety of problems, including:
Performance degradation : poor valve seal will lead to air leakage, affect the normal operation of the engine, and then reduce the overall performance of the vehicle .
mechanical failure : long-term lax sealing may lead to increased wear of the valve and valve seat, and even lead to more serious mechanical failure .
increased fuel consumption : air leakage will lead to incomplete combustion, increase fuel consumption, reduce fuel economy .
emission problem : A lax seal can affect emission controls and may result in emissions exceeding .
In order to ensure the tightness of the valve, the following measures can be taken:
The use of high quality materials and precision machining technology : high quality valve materials and precision machining technology can reduce the gap between the valve and the valve seat, improve the sealing .
regular maintenance and replacement of worn parts : timely replacement of worn valve oil seals and other seals to prevent oil from entering the valve chamber, affecting the valve sealing effect .
correct installation and adjustment : to ensure that the spring of the valve spring moderate and correct installation, to avoid due to insufficient spring spring or improper installation caused by lax closing .
Automotive valve seal refers to the ability of the valve to keep the medium fluid from flowing when it is closed . Valve seals can be classified according to the shape and position of the sealing surface and the direction of medium flow, mainly divided into the following types:
Metal seal : The use of mechanical deformation and plastic deformation between metal surfaces to seal the valve, suitable for high temperature and high pressure occasions.
soft seal : The use of insulation materials, rubber, plastic and other flexible materials as sealing components, suitable for low pressure applications, such as chemical industry and medical industry.
sleeve seal : a mechanical seal, suitable for high temperature and pressure or with corrosive media .
Valve sealing performance test
In order to ensure the sealing performance of the valve, corresponding tests need to be carried out, mainly including:
Air tightness test : Check whether there is leakage by filling a certain pressure of gas into the valve.
liquid tightness test : fill the valve with a certain pressure of liquid to check whether there is leakage and the sealing grade of the valve.
strength test : check the compressive strength and bearing capacity of the valve to ensure that it will not be damaged by material problems .
Valve sealing technology development
Valve sealing technology mainly includes seat sealing and disc sealing two parts. In recent years, with the progress of material science, processing technology and design concept, valve sealing technology has made remarkable progress. The application of new sealing materials such as polytetrafluoroethylene (PTFE), polyurethane, polyformaldehyde and other polymer materials, as well as the optimization of sealing structure design and the application of intelligent control technology, makes the valve sealing performance has been significantly improved .
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