Dynamic Dosing Restrictor Selection Graphs - Graco ProMix 2KS Installation Manual

Dynamic Dosing Restrictor Selection Graphs

Dynamic Dosing Restrictor Selection Graphs
Use the graphs on pages 37- 41 as a guide to determine
the correct restrictor size for your desired flow and mate-
rial viscosity. Table 3 lists the available restrictor sizes.
Example:
Application: air spray system with a 5:1 mix ratio
Fluid Supply: 1:1 pumps at 100 psi (7 bar, 0.7 MPa)
Flow Rate: 300 cc/min at the gun
Select the Restrictor Size: choose either the .040 or
.070 orifice, to ensure that the pressure differential
is not more than 10-20 psi (0.7-1.4 bar, .07-0.14
MPa), provided the fluid viscosities are similar to
those tested.
• If the viscosity of component B is lower than the vis-
cosity of the chart used for selection you may need
to use a smaller restrictor or decrease the pressure
differential.
• If the viscosity of component B is higher than the
viscosity of the chart used for selection you may
need to use a larger restrictor or increase the pres-
sure differential.
• In systems using an air-assisted gun, if the fluid
pressure of component A is higher than the compo-
nent A pressure from the charts you may need to
use a larger restrictor or increase the pressure dif-
ferential.
36
Table 3: Restrictor Sizes
Size Code Orifice Size
2*
3*
4*
5
6
7*
8
* These restrictors are included in Injection Kit
15U955.
 These restrictors are optional sizes, not included in
the Injection Kit.
Part No.
.020 15U936
.030 15U937
.040 15U938
.050 15U939
.060 15U940
.070 15U941
.080 16D554
312775J