Traditional Culture Encyclopedia - The 24 Solar Terms - How to repair the air leakage of airbag height control valve
How to repair the air leakage of airbag height control valve
For valves that do not use sealing grease, we can consider adding sealing grease to improve the sealing performance of the valve stem.
2. Filling method:
Adding packing can improve the sealing performance of packing to valve stem. Generally, two or more layers of mixed fillers are used, and the effect is not obvious by simply adding 3~5 pieces, such as 3~5 pieces.
3, graphite filler replacement method:
Tetrafluorous packing, because its working temperature is in the range of -20~+200℃, when the upper and lower limits of temperature change greatly, the sealing performance is obviously reduced, aging is fast and life is short. Flexible graphite filler can overcome these shortcomings and prolong its service life.
Therefore, some factories have replaced all PTFE fillers with graphite fillers, and even newly purchased control valves have replaced PTFE fillers with graphite fillers. However, the return difference of graphite filler is large, and some of it will crawl at first, which must be considered.
Cause of failure
1) The air inlet of the brake control valve is blocked by dirt. If you press the brake pedal when troubleshooting, the symptoms will disappear; The return spring of the valve is too soft, rusted or stuck by oil stain. Remove the dirt and oil stain on the surface, or replace the defective parts. At the same time, a small amount of disulfide should be coated on the sliding surface of the valve body and plunger seat.
2) The sliding surface between the valve body and the plunger seat is strained or poorly lubricated, so that the valve cannot be closed, causing the valve to be blocked, making the moving force on the plunger seat greater than the pre-tightening force of the valve return spring, and making the valve body.
3) The rubber sealing ring on the plunger seat expands, indicating this fault.
4) The axial exhaust hole on the valve is blocked by oil or dirt, and the lower two cavities are isolated. Detachable plunger seat assembly, the lower cavity forms vacuum.
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