DG series of constant pressure fillers is a kind of advanced level can-filling equipment which is researched, improved and made according to the filling technique requirement of can drink of our country on the base of introducing, digesting and absorbing foreign advanced technology. It is mainly used in filling soda drink, such as cola, light wine, mineral water and so on. It has advantages of advanced structure, reliable and smooth working, safe operation, convenient maintenance, stepless governing, high efficiency production. It is an ideal filling equipment of medium-small scale drink factory