Type of ZYBW…F dry running vacuum pressure combined pump is the derivative product of AVBW….E type pump.When aspirated vacuum is less than or equals-60kpa,supplement vacuum is more than or equals-30kpa,and vent pressure is less than or equals 60kpa,the vacuum,supplement and pressure can be used simultaneously.It is the only sbstitued of the special pump of Heidelberg offset press.Because it can complete the task of conveying and recycling paper alone in the process of high-speed printing of multicolour offset press.