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ES-008QT
Job Name _________________________________________ Contractor _______________________________________________
Job Location _______________________________________ Approval_________________________________________________
Engineer __________________________________________ Contractor P.O. No. ________________________________________
Approval __________________________________________ Representative ____________________________________________
Series 008QT
High Hazard Backflow
Preventer
Anti-Siphon, Spill-Resistant
Designed for indoor point of use applications to prevent back-siphonage of contaminated water back into the potable water supply.
Separation of the water supply from the air inlet is accomplished by
means of a diaphragm seal. This feature protects against any spillage during start-up or operation.
SIZES
3⁄8", 1⁄2", 3⁄4" and 1" (10, 15, 20, 25mm)
FEATURES
● Standardly supplied with Tee handles
● Available less Tee handle with stem wrench
flats. For use where space is limited
● Available in left-handed or right-handed outlet
● Patented design
● Spill-resistant design for indoor use
● Affordable design
● Modular cartridge for ease of service
● Vent uses an o-ring for reliable operation
● Bronze body for durability
● Compact space saving design
● ASSE 1056
● IAPMO Classified
INSTALLATION
The SVB is designed to be installed at the point of use. When factory
installed deck/machine mounted on machines or equipment, the
critical level of the SVB shall be not less than 1" (25mm) above the
flood rim. If field applied for general plumbing applications, the critical level of the SVB shall be a minimum of 6" above the flood rim.
Hood
Bonnet
O-ring
Vent
O-ring
Body
Retainer
Check
Assembly
Size: 3⁄8", 1⁄2"
Test Cock
(10, 15mm)
ASSE 1056
IAPMO Classfied
FOR INDOOR USE!
Patent # 5125429
Size 3⁄4", 1"
(20, 25mm) shown
Hood Screws
(2 Req'd)
Vent
Spring
Shutoff
Valve Assy.
(2 Req'd)
Air Bleed Screw
O-ring
Body
Vent O-ring
Retainer
Bleed O-ring
(not shown)
Hood Screw
Hood
Bonnet
Vent
Spring
Check
Assembly
Test Cock
Size: 3⁄4", 1"
(20, 25mm)
SPECIFICATIONS
A spill-resistant vacuum breaker (SVB) shall be installed, in accordance with the manufacturer's instructions, as noted on the plans.
The valve shall consist of a one piece modular check and float assembly made of engineered thermoplastic and housed in a bronze
body. Springs shall be stainless steel. The valve shall be constructed
with a molded diaphragm separating the air inlet from the potable
water supply to prevent spillage. The valve shall be a Watts SVB Series 008QT.
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.
008QT-L (Left-Handed) 008QT (Right-Handed)
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MATERIALS
Springs - Stainless Steel
Bonnet - PPO
Vent Disc - EPDM
Disc Holder - PPO
Check Disc - Silicone Rubber
Body - Bronze
PRESSURE - TEMPERATURE
Working Temp: 33° - 180°F (1° - 83°C)
Max Pressure: 150 psi (10.34 bars) - Min Pressure: 8 psi (55.2 kPa)
END CONNECTIONS
Female NPT - Ball Valve shut-offs.
Hose and Custom Connections
TYPICAL INSTALLATION
008SVB
1" min.
(25mm)
Watts P50
Pressure Reducing Valve
Test Cock
Shutoffs
Solenoid Valves
DIMENSIONS - WEIGHT
2"
E
Size DN B D E Weight
in. mm in. mm in. mm in. mm lbs. kgs.
3
⁄8 10 51⁄2 140 4 102 31⁄8 79 1.6 .73
1
⁄2 15 53⁄4 146 41⁄4 108 33⁄8 86 1.7 .77
3
⁄4 20 7 178 45⁄8 117 41⁄2 114 3.8 1.72
12571⁄2 191 5 127 47⁄8 124 4.8 2.18
Dimensions (approx.)
B
D
3
⁄4" (20mm) Hose Adapter
with strainer washer
Supply Hose
As compliled from documented Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California lab tests.
3
kPa psi
69 10
55 8
41 6
28 4
14 2
00
kPa psi
97 14
83 12
69 10
55 8
41 6
28 4
14 2
00
⁄8" (10mm) 008QT
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 gpm
P∆
0 1.9 3.8 5.7 7.6 9.5
1
⁄2" (15mm) 008QT
0 12345678910gpm
P∆
0 3.8 7.6 11.4 15.2 19 22.8 27 30 34 38 lpm
Dispensing Inducers
CAPACITY
*Typical maximum system flow rate (7.5 feet/sec.)
kPa psi
69 10
55 8
41 6
28 4
14 2
00
11.4 13.3 15.2 17.1
*
7.5 fps
2.3 mps
19 21 lpm
kPa psi
69 10
55 8
41 6
28 4
14 2
00
3
⁄4" (20mm) 008QT
0 5 10 15 20 25 30 gpm
P∆
01938577695114lpm
1" (25mm) 008QT
0 5 10 15 20 25 30 35 40 45 50 gpm
P∆
0 19 38 57 76 95 114 135 152 171 190 lpm
*
7.5 fps
2.3 mps
*
7.5 fps
2.3 mps
ES-008QT 9913 © Watts Regulator Co., 1997 Printed in U.S.A.
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