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Top Products
4308-341
Selection
Chart
Includes:
Needle/
Nozzle/Air
Cap
Kit
P/N
Needle
Assembly
P/N
Air Cap
P/N
Nozzle
P/N
Replacement
Needle T
ip
P/N
Orifice Size
949–276
238–703 185–794 185–756 191–564 0.020” (0.508 mm)
949–277
238–703 185–794 185–757 191–564 0.026” (0.660 mm)
949–278
238–703 185–794 185–700 191–564 0.030” (0.762 mm)
949–279
238–217 185–794 185–701 191–016 0.042” (1.067 mm)
949–280
238–218 185–794 185–702 191–017 0.055” (1.397 mm)
949–281
238–219 185–795 185–703 191–018 0.070” (1.778 mm)
949–282
238–220 185–796 185–704 191–019 0.086” (2.184 mm)
Selecting a Needle/Nozzle/Air Cap Kit
The
kits range in size to provide different fluid flow
rates.
D
Use the fluid nozzle that will give the required flow
with the fluid adjustment knob opened four full turns
counterclockwise and an adhesive pressure of
approximately 5 to 20 psi (0.35 to 1.4 bar).
D
For low flow rates or light viscosity fluid, select the
smaller nozzle sizes.
D
For high flow rates or high viscosity fluid, select the
larger nozzle sizes.
D
Using an air cap size that is smaller than the
nozzle/needle size
is not recommended.
D T
o help select the proper needle/nozzle size, a fluid
pressure gauge may be connected temporarily to
the gun fluid inlet to determine the fluid pressure.
D
See
Service
to install the parts.
Selection Problems and Solutions
PROBLEM POSSIBLE
CAUSE
SOLUTION
Fluid pressure
required to achieve
flow rate is too high
Using set with
too small of an
orifice
Use needle/
nozzle/air cap
set with larger
orifice
Using a low pres
-
sure setting, the
fluid flow
is too high,
making it necessary
to restrict needle
travel to reduce fluid
flow
Using set with
too large of an
orifice
Use needle/
nozzle/air cap
set with small
-
er orifice
Fluid system will not
operate at low
enough fluid pres
-
sure
Fluid regulator is
not installed or
air regulator is
not sensitive
enough
Add low pres
-
sure fluid regu
-
lator or add
more sensitive
air regulator on
pressure pot