This pumps is suitable to transports each kind to have the lubricating ability liquid, the temperature is not higher than 70 ℃, if needs high temperature 200 ℃, may use for parts the thermostable material with this unit relation then, viscosity for 5×10 -5 ~ 1.5×10 -3 m 2 /S. This pumps ill uses in to transport corrosive, contains the flinty pellet or the textile fiber, highly volatilizes or the flash point low liquid, like the gasoline, is stupid and so on.