©Copyright Task Force Tips, Inc. 2016
LIA-212 December 8, 2016 Rev03
8
5.3.1 SETTING RELIEF VALVE 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” 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
Figure 7.1
Pressure Relief Valve
5.4 PRESSURE LOSS
0
0.5
1
1.5
2
0
1000
2000
3000
4000
5000
6000
7000
0
2
4
6
8
10
12
14
16
18
20
22
24
26
0
200
400
600
800
1000
1200
1400
1600
1800
2000
LOSS (BAR)
FLOW (LPM)
LO
SS (
P
SI)
FLOW (GPM)
LDH Waterway
With Suction Screen
LDH
Waterway
Figure 5.4
Pressure Loss Chart
5.5 SUCTION SCREEN
This device may be equipped with a suction screen to catch debris larger than 3/8” diameter in the waterway. 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. See Section 5.4
for suction screen pressure loss.
