... on compressor body to protect bearing and shaft seal and keep the performance stable.7. High quality shaft seal, more wearable, better heat ... resisting, avoid the leakage of lubrication oil.8. Heat treated shaft with high intension,more wearability, long service life.9. Roller ... 13.Compressor body, made by cast aluminum, easy to radiate and more reliable, longer life service.14. Reliable oil pump, run ...