ES-LF709L
For Non-Health Hazard Applications
Job Name – ––––––––––––––––––––––––––––––––––––––––––– Contractor –––––––––––––––––––––––––––––––––––––––––––––
Job Location –––––––––––––––––––––––––––––––––––––––––– Approval – –––––––––––––––––––––––––––––––––––––––––––––
Engineer –––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. –––––––––––––––––––––––––––––––––––
Approval –––––––––––––––––––––––––––––––––––––––––––––– Representative –––––––––––––––––––––––––––––––––––––––––
LEAD FREE*
Series LF709
Double Check Valve Assemblies
Sizes: 21⁄2" – 10" (65 – 250mm)
Series LF709 Double Check Valve Assemblies are designed
to prevent the reverse flow of polluted water from entering into
the potable water system. This series can be applied, where
approved by the local authority having jurisdiction, on non-health
hazard installations. Series LF709 features a modular check
design concept to facilitate easy maintenance. Check with local
jurisdictional authority as to installation requirements. The LF709
features Lead Free* construction to comply with Lead Free*
installation requirements.
LF709 LF
Ball Valve Test Cock
Features
• Replaceable stainless steel seats
• Maximum flow at low pressure drop
• Design simplicity for easy maintenance
• No special tools required for servicing
• Captured spring assemblies for safety
• Approved for vertical flow up installation
Bolted Cover
Check Assembly
Module
Models
Suffix:
NRS – non-rising stem resilient seated gate valves
OSY – UL/FM outside stem and yoke resilient seated gate valves
S-FDA – FDA epoxy coated strainer
QT-FDA – FDA epoxy coated ball valve shutoffs
LF – without shutoff valves
Specifications
A Double Check Valve Assembly shall be installed at referenced
cross-connections to prevent the backflow of polluted water
into the potable water supply. The cross-connections shall be
determined by local inspection authority for use where a high
hazard situation does not exist. Valve shall feature modular check
assemblies with center stem guiding. Each check module shall
have a captured spring and be accessible through a bolted cover
plate. Seats shall be replaceable without special tools. It shall be a
complete assembly including tight-closing resilient seated shutoff
valves, test cocks, and a strainer is recommended. The Lead
Free* Double Check Assemblies shall comply with state codes
and standards, where applicable, requiring reduced lead content.
The assembly shall meet the requirements of ASSE No. 1015;
AWWA C510-92; CSA B64.5 and UL Classified File No. EX3185.
Approved by the Foundation for Cross-Connection Control and
Hydraulic Research at the University of Southern California. Assembly shall be a Watts Series LF709.
Replaceable
Resilient
Disc
Lower Stem
Guide
Replaceable Seat
Check Assembly Module
Series LF709 features a modular design concept which facilitates complete maintenance and assembly by retaining the
spring load. Also, the first and second check module are identical and can be interchanged.
Now Available
WattsBox Insulated Enclosures.
For more information, refer to literature ES-WB.
NOTICE
Inquire with governing authorities for local installation requirements
*The wetted surface of this product contacted by consumable water
contains less than 0.25% of lead by weight.
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Materials
Approvals
Check Valve Bodies: Epoxy coated cast iron
Seats:
Stainless Steel
1015
Pressure — Temperature
B64.5
Approved by the Foundation for Cross-Connection Control
and Hydraulic Research at the University of Southern California. Sizes 4" – 10" (100 – 250mm) approved horizontal
and vertical “flow up". Size 21⁄2" and 3" (65 – 80mm) approved horizontal only.
Factory Mutual approved 4" – 10" (80 – 250mm) vertical “flow
up" with OSY gate valves only.
Note: Model “S" not listed
Temperatures Range: 3
3°F – 110°F (0.5°C – 43°C) continuous,
140°F (60°C) intermittent
Maximum Working Pressure: 175psi (12.1 bar)
Standards
AWWA C510-92
IAPMO PA 31
USC Manual for Cross-Connection Control, 8th Edition
Dimensions ­— Weights
U
C (open)
M
D
N1 —
R
L
T
A
Size (DN)
Dimensions
A
in.
mm
in.
mm
21⁄2
3
4
6
8
10
65
80
100
150
200
250
393⁄8
403⁄8
523⁄8
627⁄8
75
90
1000
1025
1330
1597
1905
2286
C (OSY)
in.
mm
163⁄8
187⁄8
223⁄4
301⁄8
373⁄4
453⁄4
416
479
578
765
959
1162
Size (DN)
mm
93⁄8
101⁄4
123⁄16
16
1915⁄16
2313⁄16
238
260
310
406
506
605
D
U††
in.
R
mm
in.
in.
N
in.
mm
in.
mm
in.
mm
in.
mm
31/2
33/4
41/2
51/2
61/2
8
89
95
114
140
165
203
241/8
241/8
341/8
411/8
52
64
613
613
867
1057
1321
1626
11
14
14
16
21
25
279
356
356
406
533
635
10
101/8
121/8
181/2
215/8
26
254
257
308
470
549
660
61/2
7
81/4
131/2
151/2
181/2
165
178
210
343
394
470
Weight
T
Rv
mm
M
mm
mm
in.
65
10
254
4
102
16
406
3
21⁄2
3
80
10
254
5
127
16
406
3
502
6
4
100
12
305
6
152
193⁄4
6
150
20
508
11
279
26
660
71⁄2
578
286
286
9
8
200
111⁄4
111⁄4
223⁄4
1
318
318
10
250
28
711
121⁄2
101⁄4
12 ⁄2
†Dimension required for screen removal. vQuarter-turn (QT) valve dimensions.
††Service clearance for check assembly from center.
2
L
in.
Dimensions
N1†
in.
C (NRS)
in.
mm
NRS
Strainer
OSY
QT
Weight
mm
lbs.
kgs.
lbs.
kgs.
lbs.
kgs.
lbs.
kgs.
76
76
152
191
229
260
167
167
368
627
1201
2003
76
76
167
284
545
909
170
170
383
707
1307
2073
77
77
174
321
593
940
154
162
275
611
1419
2466
70
73
125
277
644
1119
28
34
60
122
247
370
13
15
27
55
112
168
Capacity
‡Typical maximum system flow rate (7.5 feet/sec.)
**UL rated flow
10315
8312
629
416
213
00
‡
21⁄2" (65mm)
6" (150mm)
kPapsi
10315
8312
629
416
213
0 50100150200250
300
gpm
0 190380 570760 950
1140
lpm
5
7.5
10
15
20fps
1.5
2.3
3.0
4.6
6.1mps
00
**
Pressure Loss
kPapsi
Pressure Loss
8312
629
416
213
00
3" (80mm)
‡
Flow Rate
**
kPapsi
10315
8312
629
416
213
Pressure Loss
10315
Pressure Loss
kPapsi
0 50 100 150200250300 350
400
gpm
0 190380 57076095011401330
1520
lpm
5 7.5 10
15fps
1.5 2.3 3.0
4.6mps
10315
8312
629
416
213
00
4" (100mm)
‡
8" (200mm)
‡
00
0
0
**
250500 1000150020002500
3000
gpm
95019003800570076009500
11400
lpm
57.5 10
15
fps
1.52.3 3.0
4.6
mps
Flow Rate
**
kPapsi
10315
8312
629
416
213
00
Pressure Loss
kPapsi
Pressure Loss
Flow Rate
**
0 10025050075010001250
1500
gpm
0 380 9501900285038004750
5700
lpm
57.5 10
15 fps
1.52.3
3.0
4.6 mps
Flow Rate
‡
0 50 100 200300 400500600
gpm
0 19038076011401520
1900
2280
lpm
5
7.510 15 fps
1.5 2.33.0 4.6 mps
Flow Rate
A Watts Water Technologies Company
ES-LF709 1319
10" (250mm)
‡
**
0 500 1000 15002000 250030003500
4000
gpm
0 1900380057007600950011400
13300
15200
lpm
5
7.5 10
15fps
1.5
2.3 3.0
4.6mps
Flow Rate
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