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The following matters should be noted in the installation and maintenance of the throttle valve

This valve often requires operation and should therefore be installed in a location that is easy to handle.

When installing, pay attention to the direction of the media and the direction of the arrow marked on the valve body.

First, the source of throttling valve body deposits is more complicated, but can be summarized into the following categories:

1. The mechanical impurities in the oil or the colloid, asphalt, carbon residue and the like deposited by the oxidation are accumulated in the throttle gap.

2. Due to aging of the oil or the generation of charged polarized molecules after being squeezed, and there is a potential difference on the metal surface of the throttling gap, the polarized molecules are adsorbed to the surface of the gap to form a strong boundary adsorption layer, and the thickness of the adsorption layer It is generally 5 to 8 microns, thus affecting the size of the throttling gap. When the above deposits and adsorbates grow to a certain thickness, they are washed away by the liquid flow and then reattached to the valve port. This cycle, the flow of the flow is formed.

3. When the valve port pressure difference is large, the temperature of the valve port is high, the degree of liquid being squeezed is enhanced, and the metal surface is more susceptible to friction to form a potential difference. Therefore, when the pressure difference is large, clogging is likely to occur.

4. PCV exhaust gas source: the mixed gas formed after the combustible 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 port 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 component" will oxidize and condense at a high temperature to form grease on the surface of the throttle valve and adhere.

5. In-depth lubricating oil of turbocharged compressor: For turbocharged engines, the exhaust gas drive mode is generally adopted, that is, the high-pressure exhaust gas generated by the exhaust passage is used to drive the turbine, and the compressed air blades in the intake port are driven through the coaxial shaft. , forming a pressurized air flow in the intake port. However, in the long-term and severe working conditions, the coaxial bearing is prone to the penetration and volatilization of the lubricating oil, and the charging efficiency is doubled, and the formation of heavy oil is more likely to increase the adhesion of the throttle body deposit.

6. Fuel vapor discharged from the carbon canister: Among the fuel vapors adsorbed by the engine canister, as long as it is a cyclopentadiene which is likely to form a throttle valve deposit, it can be oxidized and condensed to form a colloidal grease scale under a continuous high temperature.

Second, the maintenance and cleaning of the throttle valve

When the throttle valve (ie, the butterfly valve) is obstructed by the deposit, the throttle opening value is disordered, the engine cannot stably and accurately control the opening degree, and the opening value is too low, resulting in difficulty in starting, idle speed instability or abnormal flameout. When the engine accelerates or decelerates, the failure of the throttle valve to respond in time may result in an acceleration delay or a sudden increase in speed.

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