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781Mini Series Spray Valve
10
Valve Stroke Calibration
The stroke control reference ring of each 781Mini valve is factory
calibrated to the zero position. After cleaning, disassembly,
and reassembly, the stroke control zero position may require
recalibration.
CAUTION
Before any component change or service activity, relieve air
pressure from the fluid reservoirs.
CAUTION
Do not over-tighten the stroke control knob past the stop point of
clockwise rotation. Doing so can damage the assembly.
1. Make a note of the current stroke number setting.
2. Turn the stroke control knob clockwise until it bottoms out.
If the zero on the reference ring does not match up with the
reference mark on the actuator body, adjustment is needed.
3. Use a wrench to loosen the set screw.
4. Turn only the stroke reference ring until the 0 position lines up
with the reference mark on the air cylinder body.
5. Tighten the set screw.
6. Return the stroke control knob to the stroke number setting
noted in step 1.
Round Pattern Spray Area Coverage
Nozzle
Nozzle Distance from the Work Surface
2.54 mm
(0.1")
6.35 mm
(0.25")
12.7 mm
(0.5")
25.4 mm
(1.0")
38.1 mm
(1.5")
50.8 mm
(2.0")
76.2 mm
(3.0")
P/N 7361625:
Valve, spray,
781Mini, 0.01"
(0.254 mm)
1 mm
(0.04")
7.5 mm
(0.30")
8.25 mm
(0.325")
13.0 mm
(0.50")
15 mm
(0.60")
n/a
n/a
P/N 7362301:
Valve, spray,
781Mini, 0.03"
(0.76 mm)
7 mm
(0.275")
7.5 mm
(0.30")
10 mm
(0.40")
13 mm
(0.50")
15 mm
(0.60")
19 mm
(0.75")
25.5 mm
(1.0")
Stroke control
knob
Stroke reference
ring (shows the
stroke number
setting)
Set screw
Reference mark on
air cylinder body
