... such as universities and colleges, scientific research institutes, chemical industry, pharmacy, biochemistry, foodstuff, pesticide, agricultural engineering, biological ... shell, flume, ejector, tee junction, check valve and gas-extraction nozzle adopt the PP material; pump body and ... the ANSI standard. B. SHB-IIIA: ejector and gas-extraction nozzle adopt stainless steel material (ANSI standard), ...