©Copyright Task Force Tips LLC 2012-2020
8
LIN-060 November 30, 2020 Rev02
5.0 G-FORCE NOZZLE CONTROLS
5.1 PATTERN CONTROL
TFT nozzles have full pattern control from straight stream to wide fog. Turning the stream shaper clockwise (as seen from the operating
position behind the nozzle) moves the shaper to the straight stream position. Turning the shaper counterclockwise will result in an
increasingly wider pattern.
Since the stream trim point varies with flow, the stream should be “trimmed” after changing the flow to obtain the straightest and farthest
reaching stream. To properly trim the stream, first open the pattern to narrow fog. Then close the stream to parallel to give maximum
reach. Turning the shaper further forward will cause stream crossover and reduce the effective reach of the nozzle.
5.1.1 SHAPER TACTILE INDICATOR
The G-Force has a tactile indicator on the stream shaper. The tactile
indicator allows the stream shaper position (and fog angle) to be determined
by feel rather than by sight. The fog angle can be adjusted so that the
desired fog angle is achieved when the tactile indicator is on top of the
nozzle. The G-Force has an optional detent to aid in returning to a known
fog angle.
5.1.2 FOG ANGLE ADJUSTMENT
Typically, the G-Force is factory set with the tactile indicator in the top
position for straight stream. The fog angle can be adjusted while
keeping the tactile indicator on top by following the steps in
(see Figure
5.2.3)
. If the fog angle is changed/adjusted, a new shaper label is
needed.
5.2 FLUSH CONTROL
Small debris passes through the debris screen (if so equipped) and
may get caught inside the nozzle. This trapped material will cause poor
stream quality, shortened reach, and reduced flow. To remove small debris, the nozzle may be flushed as follows:
• While still flowing water, rotate the shaper counterclockwise (as viewed from behind the nozzle) to the flush position. This will
open the nozzle allowing debris to pass through. Increased resistance will be felt on the SHAPER as the nozzle goes into flush.
• During flush the nozzle reaction will decrease as the pattern becomes wider and the pressure drops. The nozzle operator must
be prepared for an increase of nozzle reaction when returning the nozzle from the flush position to retain control of the nozzle.
• Rotate the shaper out of flush to continue normal operations.
WARNING
The nozzle reaction is greatest when the shaper is in the straight stream position. Sudden changes
in pattern can cause changes in reaction, leading to loss of footing or an out of control nozzle. The
nozzle operator must be prepared for a change in reaction as the pattern is changed.
CAUTION
Dents or nicks in the nozzle tip can seriously affect the stream reach or pattern, which may increase
the risk of injury due to exposure. Care must be taken to avoid dents or nicks in the nozzle tip.
NOTICE
Turning the shaper further forward will cause stream crossover and reduce the reach of the nozzle.
NOTICE
The fog angle will change as flow and pressure change (becoming wider with increased flow).
WARNING
Large amounts or pieces of debris may be unflushable and can reduce the flow of the nozzle
resulting in an ineffective flow. In the event of a blockage, it may be necessary to retreat to a safe
area, uncouple the nozzle and remove debris.
TACTILE INDICATOR
(MOVES WITH BUMPER)
Figure 5.1.1
1)
Remove or cut the shaper label.
2)
Loosen the clamp ring
with a pin spanner.
3)
While keeping the tactile indicator
or lock out lever on top,
rotate the shaper guide
to obtain the desired fog angle.
4)
Tighten the clamp ring
with a pin spanner.
5)
Apply a new shaper label.
Figure 5.1.2
