The product bulk supply is pumped into a holding tank above a set of pneumatically operated valves. Each valve is independently timed by the filler’s master computer so that precise amounts of liquid will flow by gravity into the container. Gravity fillers built with bottom up fill capability can handle a wide range of flowable liquids including foamy products.
This type of filler is best suited for liquids filled in bulk quantities e.g. 5 gallon pails, etc. or products that have a very high manufactured value.
Water, solvents, alcohol, specialty chemicals, paint, inks, corrosive chemicals i.e. acids and bleach.
This is sometimes the only practical (and legal) type of filling for a limited range of applications and for large volume fills.