Product Name: ZYBW80/100/140F Dry Rotary Vane Vacuum Pressure Compound Pump Performance Features: ZYBW... The F-type dry rotary vane vacuum pressure compound air pump is ZYBW... Derivative products of E-type air pumps. It can generate a supplementary gas vacuum of 30kpa under the conditions of an intake vacuum of ≤-60kpa and an exhaust pressure of ≤60kpa. Therefore, it can independently complete the tasks of paper transportation and recycling during the high-speed printing process of multi-color offset printing machines, and is the only alternative to Heidelberg's dedicated air pumps for offset printing machines. Application scope: For Heidelberg four-page printing presses manufactured before 1990, one ZYBW80F is sufficient; One ZYBW140F Heidelberg double-size printing press produced before 1990 is sufficient.