Victaulic FireLock NXT 769 Series User Manual

30.82
Series 769 FireLock NXT™ Preaction Valve 7
PERFORMANCE
The chart below expresses the frictional resistance of Victaulic Series 769 FireLock NXT Preaction Valve
in equivalent feet of straight pipe.
C
V
Values
C
V
values for flow of water at +60°F/+16°C through a fully open valve are shown in the table below.
Formulas for C
V
Values:
PRESSURE DROP – PSI
10
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
2.0
3.0
4.0
5.0
6.0
20 30 40 60 80 100 200 300 400 600
800 3,000
1,000 2,000 4,000 6,000 10,000 20,000
FLOW RATE – GPM
SERIES 768/769HYDRAULIC FRICTION LOSS
FLOW OF WATER
AT +65°F (+18°C) THROUGH
FULL OPEN VALVE
4"
6"
8"
FRICTIONAL RESISTANCE
Nominal Size
Inches
Equivalent Length of Pipe
Feet
421
622
850
Nominal
Size
In./mm
Actual
Outside
Dia.
In./mm
C
V
/K
v
(Fully Open Valve)
4 4.500 350
100 114.3 302.8
6 6.625 1000
150 168.3 865.0
8 8.625 1500
200 219.1 1499.1
PΔ
Q
2
C
V
2
----------=
QC
V
ΔP×=
Where:
Q = Flow (GPM) C
V
= Flow Coefficient
ΔP = Pressure Drop (psi)

Victaulic FireLock NXT 769 Series Specifications

General

Brand	Victaulic
Model	FireLock NXT 769 Series
Category	Control Unit
Language	English