... petroleum, petrochemical, natural gas, chemical, paper making industry, used to measure the small diameter of the micro-flow measurement. (1 ) ... :caliber from 10 ~ 150mm;shell material there are several to choose from: aluminum, stainless steel and the high-pressure ... stainless steel, PPS, bronze, etc.;Bearing Materials There are many to choose from: ceramics, bronze, Hastelloy alloys, carbides, PPS, ...