Watts LF709 User Manual
For Non-Health Hazard Applications
ES-LF709L
Job Name
Job Location
Engineer
Approval
LEAD FREE
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*
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.
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
Contractor
Approval
Contractor’s P.O. No.
Representative
LF709 LF
Check Assembly
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Ball Valve Test Cock
Module
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Bolted Cover
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
Check Valve Bodies: Epoxy coated cast iron
Seats: Stainless Steel
Pressure — Temperature
Temperatures Range: 33°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
Approvals
1015
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 2
proved horizontal only.
Factory Mutual approved 4" – 10" (80 – 250mm) vertical “flow
up" with OSY gate valves only.
Note: Model “S" not listed
B64.5
1
⁄2" and 3" (65 – 80mm) ap-
D
—
N1
SIZE (DN) DIMENSIONS
A C (OSY) C (NRS) D L U†† M N
in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm
1
2
65 393⁄8 1000 163⁄8 416 93⁄8 238 31/2 89 241/8 613 11 279 10 254 61/2 165
⁄2
3 80 40
4 100 52
6 150 62
3
⁄8 1025 187⁄8 479 101⁄4 260 33/4 95 241/8 613 14 356 101/8 257 7 178
3
⁄8 1330 223⁄4 578 123⁄16 310 41/2 114 341/8 867 14 356 121/8 308 81/4 210
7
⁄8 1597 301⁄8 765 16 406 51/2 140 411/8 1057 16 406 181/2 470 131/2 343
8 200 75 1905 37
10 250 90 2286 45
SIZE (DN) DIMENSIONS WEIGHT STRAINER
N1† R
in. mm in. mm in. mm in. mm in. mm lbs. kgs. lbs. kgs. lbs. kgs. lbs. kgs.
1
2
65 10 254 4 102 16 406 3 76 167 76 170 77 154 70 28 13
⁄2
3 80 10 254 5 127 16 406 3 76 167 76 170 77 162 73 34 15
4 100 12 305 6 152
6 150 20 508 11 279 26 660
8 200
22
3
578
⁄4
10 250 28 711
L
A
3
⁄4 959 1915⁄16 506 61/2 165 52 1321 21 533 215/8 549 151/2 394
3
⁄4 1162 2313⁄16 605 8 203 64 1626 25 635 26 660 181/2 470
T NRS OSY QT Weight
1
191 627 284 707 321 611 277 122 55
⁄2
7
1
10
260 2003 909 2073 940 2466 1119 370 168
⁄4
11
12
R
v
3
502 6 152 368 167 383 174 275 125 60 27
⁄4
19
1
286
⁄4
1
318
⁄2
11
12
1
286 9 229 1201 545 1307 593 1419 644 247 112
⁄4
1
318
⁄2
R
T
†Dimension required for screen removal. vQuarter-turn (QT) valve dimensions.
††Service clearance for check assembly from center.
2
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