Watts LF719 User Manual
For Non-Health Hazard Applications
ES-LF719
Job Name
Job Location
Engineer
Approval
LEAD FREE
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*
Series LF719
Double Check Valve Assemblies
Sizes: 1⁄2" – 2" (15 – 50mm)
Series LF719 Double Check Valve Assemblies are designed to
protect drinking water supplies from dangerous cross-connections in accordance with national plumbing codes and water
authority requirements.
This series may be used in only those cross-connections identified by local inspection authorities as non-health hazard applications. Check with local authority having jurisdiction regarding
vertical orientation, frequency of testing or other installation
requirements. The LF719 features Lead Free* construction to
comply with Lead Free* installation requirements. Series LF719
meets the requirements of ASSE Std. 1015 and AWWA Std.
C510.
Contractor
Approval
Contractor’s P.O. No.
Representative
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LF719QT
Test Cocks
Features
• Manufactured from Lead Free* cast copper silicon alloy
• Separate access, top entry check valve design
• Reversible seat disc rubber, extends check valve life
• Chloramine resistant elastomers
• Replaceable seats and seat discs
• Compact design
• Top mounted screwdriver slotted ball valve test cocks
• Low pressure drop
1
•
⁄2" – 1" (15 – 25mm) have Tee handles
• No special tools required for servicing
• Plastic on plastic check guiding reduces potential binding
due to mineral deposits
Specifications
Series LF719 Double Check Valve Assembly shall be installed
at each noted location. Provide assembly with integral shutoff
valves that conform to ASSE 1015 and AWWA C510. The
assembly shall have top entry access points for each check
assembly, screw driver slotted test cocks and require the use
of no special tools for servicing. All wetted rubber parts shall
be manufactured from silicone or chloramine resistant EPDM
rubber. The Lead Free* Double Check Valve Assemblies shall
comply with state codes and standards, where applicable,
requiring reduced lead content. All valve seats and seat discs
shall be replaceable. Seat discs shall be reversible to extend
check valve life. Check valve guiding shall be plastic to plastic.
The assembly shall be a Watts Series LF719.
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.
First Check Assembly
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.
Second Check Assembly
Available Models
Suffix:
S – bronze strainer
QT – quarter-turn ball valves
Pressure-Temperature
Operating Pressure: 175psi (12.1 bar)
Operating Temperature Range: 33˚F – 180˚F (0.5˚C – 82˚C)
Materials
Body: Lead Free* cast copper silicon alloy
Elastomers: Chloramine resistant silicone and EPDM
Check Seats: PPO
Disc Holders: PPO
Dimensions/Weights
Standards
AWWA Std C510 compliant
Approvals
1015
Approved by the Foundation for Cross-Connection Control and
Hydraulic Research at the University of Southern California
D
A
N
M
E
C
B
G
H
F
LF719QT, LF719QT-S
SIZE (DN) DIMENSIONS STRAINER WEIGHT
A B C D E(LF) F G H M N 719QT 719QT-S
in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs. lbs. kgs.
1
/2 15 99/16 242 311/16 94 215/16 73 129/16 318 513/16 147 27/16 62 111/16 43 3/4 19 13/8 35 23/4 70 2.8 1.3 3.8 1.7
3
/4 20 121/8 307 41/4 108 31/2 88 157/16 393 711/16 195 31/8 79 21/16 52 11/16 27 15/8 41 33/16 81 4.7 2.1 6.4 2.9
1 25 14
1
1
/4 32 1815/16 480 61/8 156 51/8 129 241/16 610 1111/16 297 41/4 108 25/8 67 15/8 41 21/2 64 47/16 113 14.0 6.3 18.0 8.1
1
1
/2 40 1815/16 480 61/8 156 51/8 129 251/4 640 1111/16 297 43/4 121 31/8 79 15/8 41 3 76 47/8 124 16.1 7.3 19.9 9.0
13
/16 376 49/16 116 37/8 98 191/2 495 95/8 244 33/4 95 27/16 62 15/16 33 21/8 54 33/4 95 7.4 3.4 9.4 4.3
2 50 213/16 538 71/16 179 55/8 142 2815/16 735 133/8 340 53/8 137 37/16 87 115/16 49 39/16 90 515/16 151 25.7 11.6 33.4 15.2
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