Watts LFN388 - Manual (Page 2)

A
B
Pressure Loss
C
Capacities
kPa psi
96 14
83 12
69 10
55 8
41 6
28 4
14 2
0 0
Materials
Body: Lead Free* copper silicon alloy
Disc:
Silicone
Pressure — Temperature
Maximum Temperature: 180°F (82°C)
Maximum Working Pressure: 125psi (8.6 bar)
Approvals
Dimensions — Weights
0 5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 gpm
0 1.9 3.8 5.7 76. 9.5 11.4 13.3 15.2 lpm
Flow Rate
Flow Rate
3 /
8
" (10mm)
1 /
4
" (8mm)
This device is not to be used under continuous pressure. For con-
tinuous pressure application, specify Watts No. 800 Series pressure
type vacuum breakers. Vacuum breakers are not designed, tested or
approved to protect against backpressure backflow. For protection
against backpressure backflow, install Watts No. 909 Series reduced
pressure principle backflow preventers.
Since atmospheric-type vacuum breakers are subject to normal
maintenance and replacement, they should be located where emer-
gency water spillage will create no problems and where they can be
accessible for inspection or servicing.
Pressure Loss
Dry Guide out of the
liquid pressure area
Disc has high heat
and water hammer
shock resistance
Disc Float durable
and lightweight,
closes vent with
minimum flow
Full Size
Orifice assures
pipe capacity
0 5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 gpm
0 1.9 3.8 5.7 7.6 9.5 11.4 13.3 15.2 17.1 19.0 20.9 22.8 lpm
kPa psi
96 14
83 12
69 10
55 8
41 6
28 4
14 2
0 0
Size (DN) DimeNSioNS Weight
A B C
in. mm in. mm in. mm in. mm lbs. kg.
1 ⁄
4
8 1 3 ⁄
4
44 2 5 ⁄
16
59 3 ⁄
4
19 .50 .2
3 ⁄
8
10 1 3 ⁄
4
44 2 3 ⁄
8
60 7 ⁄
8
22 .75 .3
USA: Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca
A Watts Water Technologies Company
ES-LFN388 1320 © 2013 Watts
NOTICE
NOTICE
NOTICE
Inquire with governing authorities for local installation requirements