Ransburg AquaBlock2 A12148-XX - Manual (Page 12)

AquaBlock 2 - Introduction
7
DESCRIPTIONS
4-Way Shuttle Assembly
The 4-Way Shuttle Assembly consists of a series
of quick-disconnects and their respective mounting
blocks, and a pneumatic actuator. The AquaBlock
2 has four (4) Female Quick-Disconnects that are
located on two (2) stationary End Blocks. One
End Block is mounted on the left side of the shuttle
assembly and one is mounted on the right side.
Four (4) Male Quick-Disconnects are located on a
moving Center Block with two on each side. The
movement of the Center Block / Male Quick Dis-
connects is controlled by the pneumatic actuator.
As the AquaBlock 2 operates the Center Block is
shuttled, back and forth, to create a connection
to alternating sides of the cylinder and the paint
inlet and outlet.
The 4-way shuttle assembly receives grounded
paint from the paint supply system and directs it
to one end of the cylinder assembly. The paint
being forced into the cylinder forces paint out of
the other side (using incoming paint pressure).
The paint being forced out of the cylinder assem-
bly then flows through another port of the 4-way
shuttle assembly and out to the atomizer. When
the filling side of the cylinder is full, a pneumatic
signal is sent to the actuator that moves the 4-way
shuttle. The flow of paint in the 4-way shuttle is
now switched and the emptied side of the cylinder
is now filling with paint from the grounded paint
supply. The full side of the cylinder is now con-
nected to the atomizer.
Actuator
The pneumatic actuator is a part of the 4-way
shuttle assembly. It is located in the back portion
of the assembly and is shielded from high voltage
by a series of shields, covers, and mounting blocks.
When a pneumatic signal is received from the
4-way valve of the pneumatic control assembly,
the actuator moves the center block from one end
of the shuttle assembly to the other. Once the
4-way shuttle assembly is switched, the air signal
is maintained to overcome the spring force of the
quick disconnects and hold the connection.
Pneumatic Control Assembly
This assembly includes a 4-way pneumatic valve
which controls the operation of the actuator in
response to pneumatic signals received from the
end-of-stroke sensors in the cylinder assembly.
There are specially sized orifices built-in to the
90 degree cross fitting at the inlet of the 4-way
pneumatic valve which are connected to each of
the pilots. These restricted orifices supply a low
volume of air to the pneumatic sensor circuit in
the cylinder assembly.
The 4-way valve is normally maintained in an
open position to one of the specified outlet ports.
When it receives an end of stroke signal from the
cylinder assembly, it switches to the other port.
The valve supplies air to move the actuator and
the 4-way shuttle assembly to the opposite side.
Cylinder
The cylinder is a double-ended piston reservoir
with a port located at each end. The pistons are
moved by fluid pressure entering one end of the
cylinder from the paint supply system while it
is evacuated from the other end and fed to the
applicator(s).
High Voltage / 4-Way Shuttle
Interlock
A pneumatic 3-way valve is located in the top
of the AquaBlock cabinet and is activated when
the cabinet door is opened. This 3-way valve is
a normally closed type that supplies air to the
bulkhead fitting located in the top of the cabinet
and also to a high volume 3-way valve inside of
the cabinet when the door is fully closed. The
pneumatic signal at the bulkhead is intended for
an interlock for the high voltage power supply.
This interlock can be accomplished through a
pressure switch to shut down high voltage when
the cabinet door is opened. The air pilot supplied
to the high volume 3-way valve is to interlock the
motion of the 4-way shuttle assembly. When the
door is opened the pilot is removed and the air
supply to the actuator is closed off.
LN-9902-00.3
Ransburg