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The installation and maintenance of the throttle valve should pay attention to the following matters
发布时间:
2019-05-07 11:00
The throttle valve needs to be operated frequently, so it should be installed in a location where it is easy and convenient to operate.
When installing, pay attention to the direction of the medium and the direction of the arrow marked on the valve body.
1. The source of the throttle body sediment is more complicated, but it can be classified into the following categories:
1. Mechanical impurities in the oil or colloid, asphalt, carbon slag and other dirt precipitated by oxidation accumulate in the throttling gap.
2. Since the oil is aged or squeezed to generate charged polar molecules, and there is a potential difference on the metal surface of the throttling gap, the polar molecules are adsorbed to the surface of the gap to form a firm boundary adsorption layer, and the thickness of the adsorption layer Generally, it is 5~8 microns, which affects the size of the throttling gap. When the above accumulation and adsorbate grow to a certain thickness, they will be washed away by the liquid flow, and then reattached to the valve port. This cycle is repeated, forming a pulsation of the flow.
3. When the pressure difference of the valve port is large, due to the high temperature of the valve port, the degree of extrusion of the liquid is enhanced, and the metal surface is also more susceptible to friction to form a potential difference, so it is easy to cause blockage when the pressure difference is large.
4. PCV exhaust gas source: the combustible gas mixture in the combustion chamber enters the crankcase through the piston gap and is mixed with the oil vapor. To avoid dilution and contamination of the oil, the mixture is drawn into the intake tract by a positive crankcase ventilation system (PCV) for secondary combustion. After this part of the exhaust gas enters the intake port, it will condense to form a liquid phase due to the decrease in temperature, and the "unstable components" in it will be oxidized and condensed at high temperature, forming grease and adhesion on the surface of the throttle valve.
5. In-depth lubricating oil for turbocharged compressors: For turbocharged engines, the exhaust gas drive method is generally adopted at present, that is, the high-pressure exhaust gas generated by the exhaust port is used to drive the turbine, and the compressor blades in the intake port are driven by the coaxial shaft. , forming a supercharged intake air flow. However, under long-term and harsh working conditions, the coaxial bearing is prone to the penetration and volatilization of lubricating oil, and the inflation efficiency is doubled when adding it, and it is more likely to form heavy oil pollution and aggravate the adhesion of the throttle body deposits.
6. Fuel vapor discharged from the carbon canister: In the fuel vapor adsorbed by the engine carbon canister, as long as it is easy to form throttle valve deposits, cyclopentadiene can be oxidized and condensed to form a colloidal oil scale under continuous high temperature.
2. Maintenance and cleaning of the throttle valve
When the throttle valve (ie butterfly valve) is blocked by sediment, the opening value of the throttle valve is disturbed, the engine cannot control its opening stably and accurately, and the opening value is too low to cause difficulty in starting, unstable idling or abnormal flameout ; When the engine accelerates and decelerates, the throttle valve cannot respond in time, which will cause acceleration delay or sudden acceleration.


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