9.Slowly increase the air regulator setting until the approximate stall (static) pressure is achieved on fluid gauges (GA) and (GB).
SB SA
GA
GB
ti8441a
10.Check fluid pressure gauges (GA, GB) to ensure proper pressure balance. If imbalanced, reduce pressure of higher component by slightly turning PRESSURE RELIEF/SPRAY valve for that component toward PRESSURE RELIEF/CIRCULATION, until gauges show balanced pressures.
NOTE: Ensure relief tubes are in waste containers.
11. Open gun fluid inlet valves A and B.
ti2414a
12. Disengage gun piston safety lock.
ti2410a
13.Test spray onto cardboard. Adjust the air regulator to get the minimum fluid pressure that results in a good spray pattern.
NOTE: Pumps have fluid to air ratio of 25 to 1. Feed pumps add 2X feed pressure boost to outlet pressure (on the up stroke only). For best results, use regulators on feed pumps to limit inlet feed pressure to approxi- mately 100 psi (0.7 MPA, 7 bar).
14.Check A and B fluid pressure gauges (GA, GB) to ensure proper pressure balance between A and B.
15.Equipment is ready to spray.
Spraying
Spray Adjustments
Flow rate, atomization, and amount of overspray are affected by four variables.
•Fluid pressure setting. Too little pressure results in an uneven pattern, coarse droplet size, low flow, and poor mixing. Too much pressure results in excessive overspray, high flow rates, difficult control, and excessive wear.
•Fluid temperature. Effects are similar to when fluid pressure setting is too high or too low.
•Mix chamber size. Choice of mix chamber is based on desired flow rate within machine capability and fluid viscosity.
•Cleanoff air adjustment. Too little cleanoff air results in droplets building up on the front of the nozzle, and no pattern containment to control over- spray. Too much cleanoff air results in
3A1569B | 25 |
