Graco 3A0868G important safety instructions Dynamic Dosing Restrictor Selection Graphs, Example

Dynamic Dosing Restrictor Selection Graphs

Dynamic Dosing Restrictor Selection Graphs

Use the graphs on pages 61- 65 as a guide to determine the correct restrictor size for your desired flow and mate- rial viscosity. Table 4 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 0.040 or 0.070 orifice, to ensure that the pressure differen- tial is not more than 10-20 psi (0.7-1.4 bar,

0.07-0.14 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.

Table 4: Restrictor Sizes

Size Code	Orifice Size	Part No.
2*	0.020	15U936
3*	0.030	15U937
4*	0.040	15U938
5✓	0.050	15U939
6✓	0.060	15U940
7*	0.070	15U941
8✓	0.080	16D554

*These restrictors are included in Injection Kit 15U955.

✓These restrictors are optional sizes, not included in the Injection Kit.

60 3A0868G