Watts LF008PCQT User Manual
For Health Hazard and Continuous Pressure Applications
ES-LF008PCQT
Job Name
Job Location
Engineer
Approval
LEAD FREE
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*
Series LF008PCQT
Health Hazard, Anti-Siphon,
Spill-Resistant Backflow Preventer
Sizes: 3⁄8", 1⁄2", 3⁄4" and 1" (10, 15, 20, 25mm)
Series LF008PCQT is designed for indoor point-of-use applications to prevent backsiphonage 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. The LF008PCQT features Lead Free* construction to comply with Lead Free* installation requirements.
Features
• Standardly supplied with internal polymer coating
• 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
• Spill-resistant design for indoor use
• Affordable design
• Modular cartridge for ease of service
• Vent uses an O-ring for reliable operation
• Lead Free* cast copper silicon alloy body for durability
• Compact space saving design
• Satin chrome finish available
Installation
The LF008PCQT is designed to be installed at the pointof-use. When factory installed deck/machine mounted on
machines or equipment, the critical level of the LF008PCQT
shall be not less than 1" (25mm) above the flood rim. If field
applied for general plumbing applications, the critical level of
the LF008PCQT shall be a minimum of 6" (150mm) above the
flood rim.
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 Lead Free* cast copper silicon alloy
body. Springs shall be stainless steel. The Health Hazard,
Anti-Siphon, Spill Resistant Backflow Preventer shall be constructed using Lead Free* materials. Lead Free* Health Hazard,
Anti-Siphon, Spill Resistant Backflow Preventer shall comply
with state codes and standards, where applicable, requiring
reduced lead content. 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
Series LF008PCQT.
Contractor
Approval
Contractor’s P.O. No.
Representative
Size: 3⁄8", 1⁄2" (10, 15mm)
Size: 3⁄4", 1" (20, 25mm)
* The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
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FOR INDOOR USE!
LF008PCQT-L (Left Handed)
LF008PCQT
LF008PCQT (Right Handed)
Hood Screws
Hood
Bonnet
O-ring
Vent
O-ring
Body
Retainer
Check
Assembly
Hood
Bonnet
O-ring
Vent
O-ring
Body
Retainer
Check
Assembly
(2 Required)
Vent
Spring
Shutoff
Valve Assembly
(2 Required)
Hood Screw
Vent
Spring
Shutoff
Valve Assembly
(2 Required)
Air Bleed Screw
Bleed O-ring
(not shown)
Test Cock
Air Bleed Screw
Bleed O-ring
(not shown)
Test Cock
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
Springs: Stainless steel
Bonnet: PPO
Vent Disc: EPDM
Disc Holder: PPO
Check Disc: Silicone rubber
Body: Lead Free* cast copper silicon alloy
Standards
Meets requirements of IAPMO.
Approvals
1056
B64.1.2
Pressure – Temperature
Temperature Range: 33°F – 180°F (0.5°C – 83°C)
Maximum Working Pressure: 150psi (10.3 bar)
End Connections
Female NPT - Ball Valve shutoffs
Capacity
As compiled from documented Foundation for Cross-Connection
Control and Hydraulic Research at the University of Southern
California lab tests.
==
Typical maximum system flow rate (7.5 feet/sec.)
3
D
⁄8" (10mm)
FLOW
1
⁄2" (15mm)
B
11.4 13.3 15.2 17.1
==
A strainer is recommended to be installed ahead of the backflow preventer to prevent the fouling of the check assembly
and resulting spillage from the valve during repressurization. Do not install in concealed locations or areas where water
leakage due to normal wear of the internal parts can cause damage.
LF008PCQT
in. mm in. mm in. mm in. mm lbs. kgs.
3
1
3
1 25 7
19 21 lpm
NOTICE
SIZE (DN) DIMENSIONS WEIGHT
B D E
⁄8 10 51⁄2 140 315⁄16 100 31⁄8 79 1.6 .73
⁄2 15 53⁄4 146 43⁄16 106 33⁄8 86 1.7 .77
⁄4 20 7 178 45⁄8 117 41⁄2 114 3.8 1.72
kPa psi
69 10
55 8
41 6
∆P
28 4
14 2
0 0
∆P
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 gpm
0 1.9 3.8 5.7 7.6 9.5
kPa psi
97 14
83 12
69 10
55 8
41 6
28 4
14 2
0 0
0 1 2 3 4 5 6 7 8 9 10 gpm
0 3.8 7.6 11.4 15.2 19 22.8 27 30 34 38 lpm
7.5 fps
2.3 mps
FLOW
Dimensions — Weights
2"
E
LF008PCQT-S
1" min.
(25mm)
Shutoff
kPa psi
69 10
55 8
41 6
∆P
28 4
14 2
0 0
0 5 10 15 20 25 30 gpm
0 19 38 57 76 95 114 lpm
7.5 fps
2.3 mps
kPa psi
69 10
55 8
41 6
∆P
28 4
14 2
0 0
0 5 10 15 20 25 30 35 40 45 50 gpm
0 19 38 57 76 95 114 135 152 171 190 lpm
7.5 fps
2.3 mps
1
⁄2 191 51⁄8 130 47⁄8 124 4.8 2.18
Watts P60-M1
Pressure Reducing Valve
Test cock
3
⁄4" (20mm) Hose
Adapter with
strainer washer
Supply Hose
FLOW
FLOW
3
⁄4" (20mm)
==
1" (25mm)
==
Solenoid Valves
Dispensing Inducers
Typical Installation
A Watts Water Technologies Company
USA: Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca
ES-LF008PCQT 1318 © 2013 Watts
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