Page 252 - Training 2019

Pneumatic Ink Pump:

Pneumatic air pumps are run off air compressors and require a minimum pressure 1.5 bars. They
also pump with a pulse that could be a drawback, but can be overcome with a damper chamber or
by having a back flow on the out let.

Pneumatic Single Diaphragm Kelva Pumps:

Kelva ink pumps are a single diaphragm ink pump. This has only one diaphragm and is more cost
effective when servicing these pumps. There are two different types of Kelva pneumatic pumps in
the market. They are the VP12 and VP18. The VP12 pump has a cast iron body and the VP18 pump
has an acetyl and aluminium body which is more suited for chemical resistance. Both of these pumps
have an option of bayonet fitting for quick release and easy do dissemble for cleaning and general
maintenance.

Pneumatic Double Diaphragm Yamada Pumps:

Double diaphragms have become very popular over the last 25 years. They are more efficient and
quitter to run so less noise in the working environment. They have less of a pulsing action so one
can control your flow much better. They however can still create foam in the chamber blade unit
which can lead to waste. The cost are higher to maintain as there are two sets of diaphragms that
need to change. The repair kit normally comes in a kit form with 4 acetyl balls and O Rings. Most
of the Flexo printers use this type of ink pumps. Very common in the Corrugated industry as well.
Some machine have two of these pumps on one unit. One pump will pump ink into the chamber
and the other acts as a return pump. This is to keep the ink flowing and a constant flow throughout
the chamber blade unit.

INK PUMP TRAINING MANUAL 3
Updated - 24 June 2019