Ransburg DR-1 Plastic Fluid Regulator LREG5001 - Manual (Page 11)

OPERATION
The DR-1 TM plastic regulator is designed to pro-
vide remote control fluid regulation for automatic
coating applications.
The regulator features two independently control-
lable flow pressure ranges from the fluid output
port. The high flow range port accom-modates
higher fluid deliveries and minimal color change
times. The lower flow ranges provide precise fluid
delivery control. There are seven lower range
models available (1:1, 1:2, 1:3, 1:4, 1:6, 1:8, and
1:10) which can be selected based on the required
fluid flow rate.
Separate pilot signals modulate each of the regu-la-
tor’s two diaphragms to control the amount of paint
being delivered from the regulator to the spray
applicator. These pilot signals can be controlled
manually or automatically with Ransburg closed
loop flow control systems.
Because of the regulator’s dual range capabilities,
it provides the user flexibility of selecting either
the high flow range or the low flow range. Differ-
ent coating material viscosities and quick color
change requirements may necessitate the use of
both ranges. If color change time is not a factor
or if material viscosity remains relatively constant,
either port may be used depending on flow rate
requirements. All regulators, regardless of ratio
designation, have the high flow port.
The low flow (i.e. 1:2, 1:4, etc.) port provides a
lower, more precise flow response curve. Fluid
output, as a result, is less likely to be affected by
pilot signal errors. An increase in the ratio (i.e. from
1:2 to 1:4) provides a lower slope in the flow/air
signal pressure curve, but, more precise response
curve. This same increase in ratio, however, will
reduce flow capacity and should be considered
when selecting the proper regulator ratio.
The following factors must then be considered
when selecting the regulator ratio required for
proper fluid control:
• Fluid tubing inside diameter (ID) and length
• Fluid feed tube inside diameter (ID) and length
• Fluid viscosity
• Fluid input pressures
Preliminary testing will determine which regulator
ratio should be used. If conditions change after
installation which require a different low flow ratio,
this regulator can be altered easily by replacing
the existing ratio spacer ring and upper retainer
with the desired ratio (ratio designation is etched
on the side of the spacer ring).
W A R N I N G
† NEVER wrap the applicator, associated
valves and tubing, and supporting hardware
in plastic to keep it clean. A surface charge
may build up on the plastic surface and dis-
charge to the nearest grounded object. Effi-
ciency of the applicator will also be reduced
and damage or failure of the applicator com-
ponents may occur. WRAPPING THESE
COMPONENTS IN PLASTIC WILL VOID
WARRANTY.
!
DR-1 Plastic Fluid Regulator - Operation
Ransburg
8 LN-9221-00.7