8
Figure 4.6.1
Safety valve closed flow restricted
Figure 4.6.2
Safety valve opened full flow achieved
The portable base safety valve reduces the flow area through the monitor by 90%, should the base lose contact with the ground for any
reason. In the reduced flow condition, the nozzle reaction force is less and reduces the risk of injury.
While the safety valve reduces flow to the monitor, the remaining flow is still capable of causing damage and/or injury. Exercise caution
around monitor when valve is tripped or being reset. Always be sure to anchor monitor (See section 4.5).
The safety valve is spring loaded in the closed position (figure 4.6.1) and must be manually set (opened, figure 4.6.2) each time the
monitor base is deployed or re-located. To set (open) the safety valve, rotate the valve handle counter-clockwise until it locks into
position, with the handle pointing straight back. If the safety valve trips, shut off the flow of water, and determine and correct the cause
of trip before resetting safety valve. Probable causes include but are not limited to: low elevation angle, soft or uneven ground,
excessive pump discharge pressure, inadequate anchoring, etc.
The safety valve responds only to vertical movement of the monitor. To prevent sliding, the monitor must be
properly anchored, even with the safety valve option. See section 4.5 for correct anchoring procedure when using the monitor in the
portable mode.
IMPORTANT NOTE:
D i s c o n n e c t i n g ,
O v e r r i d i n g ,
o r Ta m p e r i n g W i t h
T h i s S a f e t y D e v i c e
M a y R e s u l t I n
Pe r s o n a l I n j u r y.
1) MANUALLY REDUCE OR REMOVE THE
FLOW OF WATER TO THE MONITOR.
2) CORRECT CAUSE OF TRIPPED VALVE.
3) ROTATE LEVER IN DIRECTION OF ARROW
UNTIL IT LOCKS IN PLACE.
4) SLOWLY REOPEN FLOW TO MONITOR.
TO RESET:
XL070
PATENT # 5,593,092
DANGER
Operating the monitor on a portable base below this safety stop is Dangerous. Do not
operate on portable base below safety stop. Injury or death can occur if the monitor
and base slide or lift off the ground.
When a nozzle is flowing water the reaction force acts in a straight line that is directly opposite
the water flowing out the end of the nozzle. If a nozzle on a monitor on a portable base is
pointed straight up, all of the reaction force is directed straight down and there is no sideways
force that can cause the base to slide. As the nozzle is angled downward at the same flow, the
reaction force remains the same, but some of that force becomes a force acting sideways and
some acts in a downward direction. When the nozzle is at an angle of 45°, with respect to the
base, the force acting sideways is equal to the force acting downward on the base. As the
elevation angle of the nozzle is lowered, with respect to the base, the sideways force
increases while the downward force decreases. At an angle of 35°, with respect to the base, (the angle at the elevation safety stop),
approximately 82% of the nozzle reaction force is acting sideways on the base. When the nozzle is at a zero degree angle, with respect
to the base, the entire reaction force is acting sideways on the base and there is no downward force at all. The lower the elevation angle
of the nozzle, with respect to the base, the greater the force that causes sliding, and the more likely sliding will occur.
4.7 HOSE CONNECTION
Make the hose connection(s) to the portable base and extend the hose(s) straight back from the portable base at least 10 feet. If only
one inlet of a double inlet base be used, a clapper valve will automatically close off the other inlet. Use caution when turning on the
water to the monitor on the portable base. As the hose fills it will become stiff and may cause the monitor and portable base to slide or
tip or both. Open the pump valve to the monitor slowly.
4.8 ELEVATION STOP PIN
DANGER
35°
4.9 ROTATION AND ROTATION LOCK
When the monitor is used on the portable base, keep the nozzle stream as
close to in line with the anchor strap as possible to keep the reaction force
of the nozzle on the strap. It is possible for the monitor to slide in an arc
around the anchor point. The greater the horizontal angle between the
strap and the nozzle stream, the greater the danger of sliding. When not
rotating the monitor, keep the rotation lock locked.
4.10 FLOWS & PRESSURES
See section 3.10.1. When the monitor is on the portable base do not
exceed 1250 GPM (5000 l/min) or 175 PSI (12 bar). Testing conducted by
Task Force Tips with five inch hose indicates that the use of a pressure relief
valve is desirable, but not mandatory.
Figure 4.9.1
Unlocked
Figure 4.9.2
Locked
XL090
DANGER
Operating On Portable
Base Below This Stop (pin
pulled) Is Dangerous.
