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Series LF919

Reduced Pressure Zone

Assemblies

Sizes:

⁄2" – 2" (15 – 50mm)

Series LF919 Reduced Pressure Zone Backflow Assemblies are

designed to protect potable water supplies in accordance with

national plumbing codes and water authority requirements. This

series can be used in a variety of installations, including the preven-

tion of health hazard cross-connections or for containment at the

service line entrance.

This series features two poppet style check valves, replaceable

check seats, with an intermediate relief valve. Its compact modular

design facilitates easy maintenance and assembly access. Sizes

⁄2" – 1" (15 – 25mm) shutoffs have tee handles. The LF919 fea-

tures Lead Free* construction to comply with Lead Free* installation

requirements.

Features

•Separateaccesscoversforthecheckvalvesandreliefvalve

for ease of maintenance

•Topentry-allcheckinternalseasilyaccessible

•Allrubberelastomersofchloramineresistantmaterial

•Checkvalvepoppetassembliesarefullyguidedbyinnovative

plastic seat guide

•Replaceablepush-incheckvalveandreliefvalveseats

eliminates threads from the water way

•EZtwistreliefvalvecoverquarter-turnlockingjointcaptures

the spring load during repair to facilitate disassembly

•Innovativecheckvalveplasticcoverbushingprovidestrouble

free guiding of the check valve poppet

•Bottommountedreliefvalveprovidesreducedinstallation

clearances

•Compact,spacesavingdesign

•Nospecialtoolsrequiredforservicing

•Topmountedtestcocksforeaseintestingandreduced

installation clearances

•StandardlyfurnishedwithNPTbodyconnections

Specifications

A Reduced Pressure Zone Assembly shall be installed at each

potential health hazard location to prevent backflow due to back-

siphonage and/or backpressure. The assembly shall consist of a

pressure differential relief valve located in a zone between two posi-

tive seating check valves. Seats and seat discs shall be replace-

able in both check valves and the relief valve without the use of

special tools. Service of all internal check valve components shall

be through top mounted access covers threaded to the main valve

body. The check valve poppet assembly shall be guided via the

use of a corrosion resistant plastic guide. The check valve and

relief valve seats shall be push-in type. The relief valve cover shall

be secured with stainless steel bolts and shall utilize a quarter-turn

lockingjointtocapturethespringloadofthereliefvalve.Therelief

valve shall have an internal sensing line to sense the inlet water sup-

ply. All rubber elastomers shall be of chloramine resistant material.

The assembly shall also include two resilient seated isolation valves,

four top-mounted resilient seated test cocks and an air gap drain

fitting. The Lead Free* Reduced Pressure Zone Assembly shall

comply with state codes and standards, where applicable, requiring

reduced lead content. The assembly shall be a Watts Series LF919.

For Health Hazard Applications

ES-LF919

LF919QT

⁄4" (20mm)

Now Available

WattsBox Insulated Enclosures.

For more information, refer to literature ES-WB.

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 with-

out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

LEAD FREE

JobName

–––––––––––––––––––––––––––––––––––––––––––

 Contractor

––––––––––––––––––––––––––––––––––––––––––––

Job Location

–––––––––––––––––––––––––––––––––––––––––

Approval

–––––––––––––––––––––––––––––––––––––––––––––

Engineer

–––––––––––––––––––––––––––––––––––––––––––––

 Contractor’sP.O.No.

––––––––––––––––––––––––––––––––––

Approval

–––––––––––––––––––––––––––––––––––––––––––––

Representative

––––––––––––––––––––––––––––––––––––––––

*The wetted surface of this product contacted by consumable

water contains less than 0.25% of lead by weight.

NOTICE

Inquire with governing authorities for local installation requirements

1 2 3

Shrnutí obsahu

Strany 1 - LEAD FREE

Series LF919Reduced Pressure Zone AssembliesSizes: 1⁄2" – 2" (15 – 50mm)Series LF919 Reduced Pressure Zone Backflow Assemblies are designed

Strany 2 - LF919QT, LF919QT-S

LF919QT, LF919QT-S SIZE (DN) DIMENSIONS STRAINER DIMENSIONS WEIGHT A B C D E (LF) F G H M N in. mm in. mm in. mm in. mm in. mm i

Strany 3 - Capacities

Flow RatePressure LosskPa psi207 30172 25138 20103 1569 1034 5 0 00 10 20 30 40 50 gpm0 38 76 114 152 190 lpm3⁄4" (20mm)Flow RateP

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