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  • Why Hydraulic Hose Lose Efficacy
  • Why Hydraulic Hose Lose Efficacy?
    1.       Symptom: hydraulic hose’s inner tube is very hard, once cracking
    Reason analysis: high temperature easily precipitates inner tube’s plasticizer, which will make the hydraulic hose soft enough.. Oil mixed with gas makes inner tube oxidized. This reaction will make rubber products hard. Oxygen and high temperature will greatly accelerate hardening of inner tube.
     
    2.       Symptom: hydraulic hose’s inner tube and outside tube both are cracking, while the elastic data is still soft and bending at room temperature
    Reason analysis: when bend the hydraulic hose, ambient temperature is very low. Generally, additional temperature of hydraulic hose is -40 degree Celsius. Some AQP hoses’ additional temperature is -49 degree Celsius. Military hoses’ additional temperature is -54 degree Celsius. Some thermoplastic hoses’ additional temperature also is -54 degree Celsius. PTEF hoses’ additional temperature is -73 degree Celsius.
     
    3.       Symptom: inner tube was broken; Peel outside wire reinforcement layer and found that for whole hydraulic hose, wire irregularly broken down.
    Reason analysis: this shows the hydraulic hose usually be in a highly frequent pressure shaking situation. Regarding impact experiments on the two-story steel wire braided hose, SAE American Association of Automobile Manufacturers required to reach 200 000 in 133% of the referrals the task under the pressure of reincarnation. Regarding four layers spiral hydraulic hose impact experiments, SAE required to reach the 500 000 cycle. If extrapolation pulses of system in a short period works beyond one million times, it is better to choose hydraulic hose with spiral reinforcement.
     
    4.       Symptom: hydraulic hose crake, while wire does not break up and multi place of the hydraulic hose crake
    Reason analysis: this working pressure is over than minimum burst pressure of the hydraulic hose. Recommend to use hydraulic hose with higher strength.
  • close   print clock 2012-08-31
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