Page 1
For Non-Health Hazard Applications
ES-719
Job Name
Job Location
Engineer
Approval
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Series 719
Double Check Valve Assemblies
Sizes: 1⁄2" – 2" (15 – 50mm)
Series 719 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.
Series 719 meets the requirements of ASSE Std. 1015 and AWWA
Std. C510.
Features
• Manufactured from bronze 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
Contractor
Approval
Contractor’s P.O. No.
Representative
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719QT
Test Cocks
Specifications
Series 719 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 bronze covered 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.
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 719.
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
Second Check Assembly
Page 2
Available Models
Suffix:
S – bronze strainer
LF – without shutoff valves
SH – stainless steel ball valve handles
HC – 2
1
⁄2" (65mm) inlet/outlet fire hydrant fittings
for 2" (50mm) valve
QT – quarter-turn ball valves
C&T – testcock caps and tethers
AQT – street elbows with quarter-turn ball valves
Prefix:
U – union connections
Pressure-Temperature
Operating Pressure: 175psi (12.1 bar)
Operating Temperature Range: 33˚F – 180˚F (0.5˚C – 82˚C)
Dimensions/Weights
Materials
Body: Bronze
Elastomers: Chloramine resistant silicone and EPDM
Check Seats: Engineered Plastic
Disc Holders: Engineered Plastic
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
719QT, 719QT-S
SIZE (DN) DIMENSIONS STRAINER DIMENSIONS 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
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
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
Page 3
D
A
N
C
B
M
G
E
H
F
U719QT, U719QT-S
SIZE (DN) DIMENSIONS STRAINER DIMENSIONS WEIGHT
A B C D E (LF) F G H M N U719QT U719QT-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 1513/16 402 49/16 116 37/8 98 1813/16 478 113/8 289 3 76 111/16 43 15/16 33 13/8 35 23/4 70 7.4 3.4 8.4 3.8
3
/4 20 161/4 412 49/16 116 37/8 98 195/8 498 115/16 287 33/8 86 21/16 52 15/16 33 15/8 41 33/16 81 7.9 3.6 9.7 4.4
1 25 17
1
1
/4 32 207/8 530 61/8 156 51/8 129 26 660 153/8 390 41/4 108 25/8 67 15/8 41 21/2 64 47/16 113 17.6 8.0 21.6 9.8
1
1
/2 40 219/16 547 61/8 156 51/8 129 277/8 708 153/8 390 43/4 121 31/8 79 15/8 41 3 76 47/8 124 19.8 9.0 23.5 10.7
2 50 24
5
/16 439 49/16 116 37/8 98 22 558 113/4 297 33/4 95 27/16 62 15/16 33 21/8 54 33/4 95 8.9 4.0 10.9 5.0
7
/16 621 71/16 179 55/8 142 323/16 817 163/4 425 53/8 137 37/16 87 115/16 49 39/16 90 515/16 151 30.0 13.6 37.7 17.1
D
E
B
A
C
H
G
F
719AQT
SIZE (DN) DIMENSIONS WEIGHT
A B C D E (LF) F G H
in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs.
1
/2 15 77/8 200 35/16 84 215/16 73 215/16 73 513/16 147 27/16 62 111/16 43 3/4 19 3.4 1.5
3
/4 20 137/16 340 413/16 121 49/16 116 31/2 98 711/16 195 31/8 79 21/16 52 11/16 27 5.7 2.6
1 25 12
1
1
/4 32 153/16 386 511/16 144 511/16 144 51/8 129 1111/16 297 41/4 108 25/8 67 15/8 41 15.7 7.1
1
1
/2 40 1513/16 401 63/16 156 63/16 156 51/8 129 1111/16 297 43/4 121 31/8 79 15/8 41 18.4 8.3
2 50 17
11
/16 322 5 127 43/8 110 37/8 98 95/8 244 33/4 95 27/16 62 15/16 33 8.9 4.0
3
/8 441 65/8 168 69/16 167 55/8 142 133/8 340 53/8 137 37/16 87 115/16 49 29.0 13.1
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Capacities
* Typical maximum flow rate (7.5 feet/sec.)
QT AQT UQT
1
*
⁄2" (15mm)
*
3
⁄4" (20mm)
kPa psi
110 16
97 14
69 10
55 8
41 6
28 4
14 2
0 0
0 1 2 3 4 5 6 7 8 9 10 11 12 gpm
0 4 8 23 15 19 23 27 30 34 38 42 46 lpm
7.5 fps
2.29 mps
kPa psi
172 25
138 20
103 15
69 10
34 5
0 0
0 2 4 8 12 16 18 20 24 28 30 34 45 gpm
8 15 30 46 61 69 76 91 106 114 129 171 lpm
7.5 fps
2.29 mps
1
1
kPa psi
138 20
103 15
69 10
34 5
0 0
0 2 4 8 12 16 20 30 40 50 60 70 75 80 90 100 110 gpm
8 15 30 46 61 76 114 152 190 228 266 285 304 342 380 418 lpm
7.5 fps
2.29 mps
kPa psi
110 16
97 14
83 12
69 10
55 8
41 6
28 4
14 2
0 0
0 2 4 6 12 16 20 30 40 50 60 70 80 90 100 110 120 gpm
8 15 23 46 61 76 114 152 190 228 266 304 342 380 418 456 lpm
7.5 fps
2.29 mps
⁄4" (32mm)
1
1
⁄2" (40mm)
*
*
kPa psi
97 14
83 12
69 10
55 8
41 6
28 4
14 2
0 0
0 2 4 6 12 16 20 30 40 50 60 gpm
8 15 23 46 61 76 114 152 190 228 lpm
7.5 fps
2.29 mps
1" (25mm)
*
A Watts Water Technologies Company
kPa psi
97 14
83 12
69 10
55 8
41 6
28 4
14 2
0 0
0 4 12 20 40 60 80 100 120 140 160 200 gpm
15 46 76 152 228 304 380 456 532 480 760 lpm
7.5 fps
2.29 mps
USA: Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca
2" (50mm)
*
ES-719 1318 © 2013 Watts
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