Binks HP 4/32 - Page 5

5
Comments on figure 1
The pneumatic drive (1) drives the BINKS airless pump. An airflow controller in the pneumatic drive
applies compressed air alternately to the pneumatic drive butt plate. This sets the butt plate moving
upwards and downwards.
The pneumatic drive is flange-mounted directly to the spray material pump (4). A moving axle con-
nects the pneumatic drive butt plate to the double piston of the spray material pump.
The ascending stroke of the double piston draws in the spray through the suction system (5) and
the foot valve of the spray material pump. At the same time, the material spray, which is already in
the spray material pump above the double piston, is ejected through a check valve into the high
pressure filter (11).
The descending stroke of the double piston closes the foot valve and the spray material which has
been drawn in, is forced through a plunger valve into the space above the double piston. At the
same time, the spray material which is already there is ejected into the high pressure filter.
If the airless gun take-off is not operative, counter pressure will build up in the spray material line.
The pump will stop. Remove spray material from the airless gun and the BINKS airless pump will
start up again.
The area of the butt plate is greater than the area of the double piston. This difference in area
causes the pressure to intensify. With an area ratio of 60/1, for example, a working pressure of 1
bar at the pneumatic drive will be intensified to a working pressure of 60 bar at the spray material
pump.
The release agent chamber (10) physically separates the butt plate of the pneumatic drive from the
double piston of the spray material pump. The release agent chamber is filled with release agent
(Order Code 0114-014871 for waterborne paint, Order Code 0114-009433 for solvent paint). The
release agent cleans the double piston of the spray material pump and lubricates the packing and
the moving axle.
The volume of air and thus the delivered volume of spray material is regulated by the working pres-
sure at the compressed air control valve (7). The compressed air control valve is equipped with an
excess pressure safety valve, which is triggered if the maximum working pressure at the pneumatic
drive is exceeded.
The spray material pump can draw in spray material in two ways.
Direct suction:
This involves immersing the suction system in the spray material.
Suction through a flexible suction system:
This involves connecting the spray material pump to a flexible suction system. The free end of the
suction system is inserted into the tank containing the spray material.