Watts LF07S User Manual

For Residential Fire Sprinkler Applications

ES-LF07S

Job Name

Job Location

Engineer

Approval

LEAD FREE

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*

Series LF07S

Residential Fire Sprinkler
Dual Check Backflow Preventer

Sizes: 1" – 2" (25 – 50mm)

The Watts Model LF07S Residential Fire Sprinkler Dual Check
Backflow Preventer is designed for non-health hazard [i.e., pollutant]
application on potable fire sprinkler service connections to protect
against possible backsiphonage conditions that could inadvertently
drain the fire sprinkler system.

Approvals - Standards

Please consult Local Governing Code for proper installation and
agency code requirements,

Sizes Applicable: 1" Only

B64.6

Contractor

Approval

Contractor’s P.O. No.

Representative

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1" LF07SU2-2

2" LF07SU2-2

Sizes Applicable: 1", 11⁄2" & 2" Only

All Sizes Applicable

1024

ANSI/NFPA 13, 14, 15, 20, 22, and 24 Compliant ­All Sizes Applicable

End Connections – National Pipe Thread Taper ANSI B1.20.1

Pressure - Temperature

Max. Working Pressure: 175psi (12.1 bar) 11⁄2" & 2"

Min. Working Pressure: 10psi (0.69 bar)
Hydrostatic Test Press: 700psi (48.3 bar)

Temperature Range: 33°F to 140°F (0.5°C to 60°C)

160psi (11.03 bar) 1" & 1

1

1" & 1

⁄4"

33°F to 180°F (0.5°C to 82°C)

1

1

⁄2" & 2"

1

⁄4"

Specifications

The Lead Free* Dual Check Valve Backflow Preventer shall be

®

Listed 1024 and be UL Classified. The main body shall

ASSE
be Lead Free* brass featuring replaceable seats and silicone seat
discs. The check assemblies shall have captured springs to pre­vent injury. The Dual Check Valve shall be a Watts Model LF07S.

Material Specifications

• Body: Lead Free* Brass

• Elastomers: Silicone

• O-Rings: EPDM or Buna N

• Check Modules: Engineered Plastics

• Springs: Stainless Steel

Typical Installation

The Model LF07S is typically installed for service on residential fire
sprinkler systems. It is recommended this device is installed after
a water meter and/or isolation shutoff valve with installation tech­niques that comply with the latest edition of the Uniform Plumbing
Code. Please consult Local Governing Code for proper installation
and agency code requirement.

*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.

Configurable Options

The Model LF07S is standardly supplied with National Pipe Thread
Female [NPT] union inlet & Female [NPT] outlet connection.

Refer to the table below for optional inlet/outlet configurations.

Available Inlet Connections

CONNECTION TYPE LOCATION MODEL

SUFFIX

CODE

Meter Thread Female Inlet 4

Meter Thread Male Inlet 5

National Pipe Thread Male Inlet/Outlet 3

National Pipe Thread Female Inlet/Outlet 2

APPLICABLE

MODEL SIZES

1

⁄4"

1" & 1

(25 & 32mm)

1

1" & 1

⁄4"

(25 & 32mm)

1

1" & 1

⁄4"

(25 & 32mm)

1

1", 1

⁄4", 11⁄2" & 2"

(25, 32, 40 & 50mm)

Ordering Matrix Examples

VALVE

SIZE

MODEL UNION

INLET

INLET

THREAD

CODE

OUTLET

THREAD

CODE

MODEL ORDERING

DESCRIPTION

1" x 1" LF07S U 2 - 2 1" x 1" LF07SU2-2
1" x 1" LF07S U 4 - 2 1" x 1" LF07SU4-2
2" x 2" LF07S U 2 - 2 2" x 2" LF07SU2-2

Dimensions – Weights

Capacity

16.0

14.0

12.0

10.0

PSI

8.0

Drop

*Friction

6.0

Loss

4.0

2.0

0.0

24.0

22.0

20.0

18.0

16.0

14.0

PSI

Drop

12.0

*Friction

10.0

Loss

8.0

6.0

4.0

2.0

0.0

1" (25mm) LF07S

Rated Flow *UL Rated Flow [1" Only]

0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0

0.0 37 75 114 151 190 227 265

10.2 20.4

11⁄2" (40mm) LF07S

Rated Flow *UL Rated Flow

0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0

0.0 75 151 227 303 379 454 530

9.0 818.1

GPM
LPM
fps

GPM
LPM
fps

B

C

A

LF07S

SIZE (DN) DIMENSIONS WEIGHT

A B C

in. mm in. mm in. mm in. mm lbs. kgs.

1 25
11⁄4 32
11⁄2 40

2 50

NOTE: This information is not intended to replace the product

installation and safety information available or the experience of a
trained product installer. Please refer to the product installation and
safety instructions for further information.

63⁄4 171 213⁄16 71 2 50 3.0 1.36
63⁄4 171 213⁄16 71 2 50 3.0 1.36
63⁄4 171 311⁄16 93 213⁄16 71 3.9 1.77

615⁄16

176

311⁄16

93

213⁄16

71 4.4 2.0

PSI

Drop

*Friction

Loss

2" (50mm) LF07S

35.0

30.0

25.0

20.0

15.0

10.0

5.0

0.0

0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 160.0 180.0

0.0 151 303 454 606

8.2 16.3

Rated Flow *UL Rated Flow

GPM
LPM
fps

A Watts Water Technologies Company

USA: Tel. [phone] • Fax: [phone] • www.watts.com

Canada: Tel. [phone] • Fax: [phone] • www.watts.ca

ES-LF07S 1315 © 2013 Watts