The installation and maintenance of the throttle valve should pay attention to the following items

The valve often needs to be operated, so it should be installed in a position that is easy and convenient to operate.
When installing, pay attention to keep the direction of the medium consistent with the direction of the arrow marked on the valve body.
1. The sources of throttle body deposits are more complicated, but they can be classified into the following categories:
1. Mechanical impurities in the oil or colloid, asphalt, carbon residue and other dirt due to oxidation are accumulated in the throttling gap.
2. Due to the aging or extrusion of the oil, charged polarized molecules are produced, and there is a potential difference on the metal surface of the throttling gap, so the polarized molecules are adsorbed to the surface of the gap, forming a firm boundary adsorption layer, and the thickness of the adsorption layer is Generally, it is 5~8 microns, which affects the size of the throttling gap. When the above accumulations and adsorbates grow to a certain thickness, they will be washed away by the liquid flow, and then reattached to the valve port. Repeatedly in this way, the pulsation of the flow is formed.
3. When the pressure difference at 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. Therefore, when the pressure difference is large, blockage is likely to occur.
4. PCV exhaust gas source: the combustible mixture in the combustion chamber enters the crankcase through the piston gap, and is mixed with engine oil vapor to form a mixed gas. To avoid diluting and contaminating the oil, the mixture is drawn into the intake tract by the 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 temperature drop, and the "unstable components" in it will oxidize and condense at high temperature, and form grease on the surface of the throttle valve and adhere to it.
5. In-depth lubricating oil for turbocharged compressors: For turbocharged engines, the exhaust gas drive method is generally adopted, that is, the high-pressure exhaust gas generated by the exhaust passage is used to drive the turbine, and the compressor blades in the intake passage are driven through the coaxial, The formation of air intake port air pressure boost. However, under long-term and harsh working conditions, coaxial bearings are prone to penetration and volatilization of lubricating oil, and the efficiency of inflation is doubled, which is more likely to form heavy oil and aggravate the adhesion of throttle body deposits.
6. Fuel vapor discharged from the carbon canister: Among the fuel vapor absorbed by the carbon canister of the engine, cyclopentadiene is easy to form throttle valve deposits, and it can be oxidized and condensed to form colloidal grease under continuous high temperature.

Throttle valve maintenance and cleaning
When the throttle valve (butterfly valve) is blocked by deposits, the throttle opening value will be disordered, and the engine cannot control its opening stably and accurately. If the opening value is too low, it will cause difficulty in starting, unstable idling speed or abnormal flameout ; When the engine accelerates and decelerates, the throttle valve cannot respond in time, which will cause acceleration delay or sudden speed increase.