内燃机冷却水泵所使用的F20陶瓷石墨水封,1979年底农机部鉴定通过后,在我厂使用。实践证明,该水封具有结构紧凑、使用和拆装方便、封水效果可靠、使用寿命长(一般比夹布胶木水封寿命提高约5倍)等特点,有效地解决了水泵的漏水问题。目前已在我厂生产的4120S、6120S系列柴油机和125S型柴油机等46个机型品种上批量使用。其它厂生产的X105、495、4115、4125S等机型也将推广使用。 F20 ceramic graphite water seal used for internal combustion engine cooling water pump was used by our factory after appraisal by Agricultural Machinery Department at the end of 1979. Practice has proved that the water seal has the advantages of compact structure, convenient use and disassembly, reliable sealing effect and long service life (generally, it is about 5 times longer than that of the bakelite water seal) and effectively solves the water leakage problem of the water pump. Has been in our plant production 4120S, 6120S series of diesel engines and 125S-type diesel engines, and other 46 models on the batch use. Other manufacturers of the X105, 495, 4115, 4125S and other models will also be promoted.