... EXECUTION STANDARDQ/SSL067-2007 "Liquid Ring Vacuum Pump and Compressor". API681 "Liquid Ring Vacuum Pump and Compressor" or DIN28431 "Acceptance Specifications for ... Plastics machinery: squeezing forming, vacuum forming.Metallurgy industry: washing and selecting vacuum dehydration.Tobacco industry: negative pressure system of ... steel 304, 304L, 316, 316L, etc. Liquid Ring Vacuum Pump and Compressor