©Copyright Task Force Tips LLC 2020
LIM-032 February 18, 2020 Rev00
7
5.0 NOZZLE OPERATION
5.1 AUTOMATIC NOZZLE OPERATION
Automatic nozzles operate by sensing the pressure at the nozzle’s inlet and adjusting the discharge opening to maintain a constant
pressure throughout the
fl
ow range of the nozzle. For example, when the pressure at the inlet increases, the exit area is automatically
increased until the inlet pressure returns to the nominal pressure of the nozzle.
Note: Inlet pressure of a Masterstream ER automatic nozzle will stabilize at the nominal pressure within 5%. This stabilization may
take as long as half a minute after a change in inlet pressure.
5.2 SELECTABLE NOZZLE OPERATION
A selectable nozzle has several discharge ori
fi
ces that can be set to a user selected position. In each position the nozzle acts as a
fi
xed ori
fi
ce nozzle.
5.3 FLOW SELECTION
The Master 4000 ER selectable nozzle utilizes two stainless steel pegs to set the
fl
ow rate.
To change
fl
ow rate:
1. Remove the
fl
ow selector pegs from the ba
ffl
e cap
by unthreading them counterclockwise.
2. Rotate the gallonage selector until the indicator
windows align with the desired
fl
ow.
3. Thread the
fl
ow selector pegs into the counter-bored
holes in the ba
ffl
e cap aligned with holes in the
gallonage selector until hand tight.
REMOVE
PEG
REMOVE
PEG
ROTATE
GALLONAGE
SELECTOR
INDICATOR
WINDOW
INDICATOR
WINDOW
Figure 5.3
