©Copyright Task Force Tips LLC 2014-2019
LIA-208 August 12, 2019 Rev04
16
5.5.1 RELIEF VALVE SETTING PRESSURE
To set the relief valve pressure turn the adjusting
screw on the relief valve housing until the surface
of the screw is even with the desired pressure. A
9/16” (14mm) socket or a 1/4” (6mm) Allen wrench
may be used to turn the adjusting screw. The
Pressure relief valve should not be disabled (IE:
capped, plugged, or set to the OFF position) for
normal service conditions. Disabling the relief valve
may result in system damage or hose rupture if the
system exceeds operating limits. The pressure
relief valve meets the requirements of NFPA 1901.
Adjusting Screw
Optional
Threaded Outlet
(TFT #A1114)
Figure 7.1
Pressure Relief Valve
5.7 SUCTION SCREEN
This device may be equipped with a suction
screen to catch debris larger than 3/8” diameter
in the waterway. See chart to determine additional
loss caused by the screen. To add or replace a
suction screen, order TFT part #A1410-KIT for the
4.5” waterway, and TFT part #A1411-KIT for the
5.0” waterway.
0
5
10
15
20
25
30
35
LOSS (PSI)
0
0.5
1
1.5
2
FLOW (LPM)
LOSS (BAR)
4.5" Waterway
5.0" Waterway
0
1000
2000
3000
4000
5000
6000
7000
0
1000
200
400
600
800
1200
1400
1600
1800
2000
Figure 5.7
Suction Screen Pressure Loss
5.6 PRESSURE LOSS
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0
2000
4000
6000
8000
10000
0
2
4
6
8
10
0
500
1000
1500
2000
2500
FLOW (LPM)
FLOW (GPM)
5 INCH COUPLING
LOSS (PSI)
LOSS (BAR)
6 INCH COUPLING
Figure 5.6
Pressure Loss Chart
