How to check whether the automobile air valve works well?
The air butterfly valve products of Shanghai Dongfeng Pump Valve Factory are mainly used on the bases of buses, luxury cars, trucks, commercial vehicles, rail cars, industrial machinery, industrial equipment, etc. Dongfeng welcomes new and old customers to call and inquire: 021-60344211 air butterfly valve electric butterfly valve is mainly used to rapidly attenuate the vibration of the frame and body, improve the smoothness and comfort of the vehicle. The vehicle suspension system is generally equipped with shock absorbers. The shock absorber is a vulnerable part in the use of the vehicle. The working quality of the shock absorber will directly affect the stability of the vehicle and the life of other parts. Therefore, we should keep the shock absorber in good working condition. So how to check whether the shock absorber works well? Next, Dongfeng will share with you
1. Stop the car after driving 10km on the road with poor road conditions, touch the shock absorber housing with your hand. If it is not hot enough, it means that there is no resistance inside the shock absorber and the shock absorber does not work. At this time, appropriate lubricating oil can be added and the test can be carried out again. If the shell is hot, it means that there is a lack of oil inside the shock absorber, and sufficient oil should be added; Otherwise, the shock absorber is invalid.
2. When the car drives slowly and brakes urgently, if the car vibrates violently, it indicates that there is a problem with the shock absorber.
3. Press the bumper firmly and release it. If the car jumps 2-3 times, it means that the air butterfly valve is working well.
4. After confirming that the shock absorber is defective or invalid, check whether the shock absorber has oil leakage or traces of obsolete oil leakage.
5. The oil seal washer and seal washer are broken and damaged, and the nuts of the oil storage cylinder cover are loose.
6. Dismantle the shock absorber and put it upright, clamp the lower connecting ring on the bench clamp, pull and press the shock absorber rod several times with force. At this time, there should be stable resistance. The resistance of pulling up (restoring) should be greater than the resistance of pressing down. If the resistance is unstable or no resistance, it may be due to lack of oil in the shock absorber or damage of valve parts, repair or replace the parts.
If oil leakage is found, first tighten the nuts of the oil cylinder head. If the shock absorber still leaks oil, it may be that the oil seal and sealing washer are damaged and invalid. Replace the seals with new ones. If the oil leakage still cannot be eliminated, pull out the shock absorber rod. If you feel stuck or the weight is different, further check whether the clearance between the piston and the cylinder barrel is too large, whether the piston connecting rod of the shock absorber is bent, and whether the surface of the piston connecting rod and the cylinder barrel are scratched or pulled.
If the automobile air valve is free of oil leakage, check whether the shock absorber connecting pin, connecting rod, connecting hole, bushing, etc. are damaged, desoldered, cracked or fallen off. If the above inspection is normal, the shock absorber shall be further disassembled to check whether the fit clearance between the piston and the cylinder barrel is too large, whether the cylinder barrel is strained, whether the valve seal is good, whether the valve disc and the valve seat fit tightly, and whether the stretching butterfly valve of the shock absorber is too soft or broken. The method of grinding or replacing parts shall be adopted according to the situation.
In addition, the shock absorber will make noise in actual use, which is mainly caused by collision between the shock absorber and steel plate butterfly valve, frame or shaft, damage or falling of rubber pad, deformation of shock absorber dust cylinder, insufficient oil and other reasons. Find out the cause and repair it.
After inspection and repair, the shock absorber shall be tested for working performance on a special test bench. When the resistance frequency is 100 ± 1mm, the resistance of its stretching stroke and compression stroke shall meet the requirements. For example, the maximum resistance of Jiefang CAl091 stretching stroke is 2156-2646N, and the maximum resistance of compression stroke is 392-588N; The maximum resistance of Dongfeng truck in stretching stroke is 2450-3038N, and the maximum resistance in compression stroke is 490-686N. If there is no test condition, we can also adopt an empirical approach, that is, use an iron bar to penetrate into the lower lifting ring of the shock absorber, step on its two ends with both feet, hold the upper lifting ring with both hands and pull it back and forth for 2-4 times. When it is pulled up, the resistance is great, and when it is pressed down, it does not feel laborious. Moreover, the resistance of stretching has recovered compared with that before repair, and there is no sense of empty travel, which indicates that the shock absorber is basically normal.
The above is about how to check whether the shock absorber works well. For more information on the purchase of air butterfly valves, please visit the official website of Shanghai Dongfeng Pump Valve Factory: //www.dongfengfamen.com//