Submittal Sheet

ManualsBrandsWatts ManualsBackflow Preventers3" 957 NRS Stainless Steel RPZ Assembly

For Health Hazard Applications

ES-957/957N/957Z

Job Name

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Contractor

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Job Location

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Approval

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Engineer

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Contractor’s P.O. No.

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Approval

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Representative

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Series 957, 957N, 957Z

Reduced Pressure Zone Assemblies

Sizes: 2

/2" – 10" (65 – 250 mm)

Series 957, 957N, 957Z Reduced Pressure Zone Assemblies pro-

vide protection to the potable water system from contamination in

accordance with national plumbing codes. Series 957, 957N, 957Z

are normally used in health hazard applications for protection against

backsiphonage or backpressure.

Features

• 2

⁄2" and 3" (65 and 80mm) sizes available with quarter-turn ball

valve shutoffs

• Replaceable check disc rubber

• Extremely compact design

• 70% Lighter than traditional designs

• 304 (Schedule 40) stainless steel housing & sleeve

• Groove fittings allow integral pipeline adjustment

• Patented torsion spring checks provide lowest pressure loss

• Unmatched ease of serviceability

• Bottom mounted cast stainless steel relief valve

• Available with grooved butterfly valve shutoffs

Specifications

The Reduced Pressure Zone Assembly shall consist of two inde-

pendent torsion spring check modules, a differential pressure relief

valve located between and below the two modules, two drip tight

shutoff valves, and required torsion spring check modules and relief

valve shall be contained with a sleeve accessible single housing con-

structed from 304 (Schedule 40) stainless steel pipe with groove end

connections. Torsion spring checks shall have replaceable elastomer

discs and in operation produce drip tight closure against the reverse

flow of liquid caused by backpressure or backsiphonage. Assembly

shall be a Watts Regulator Company Series 957, 957N, 957Z.

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.

957OSY

957ZBFG

957QT

Summary of content (4 pages)

PAGE 1
ES-957/957N/957Z For Health Hazard Applications Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor –––––––––––––––––––––––––––––––––––––––––––– Job Location ––––––––––––––––––––––––––––––––––––––––– Approval Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No.
PAGE 2
Available Models Materials Suffix: Housing & Sleeve: 304 (Schedule 40) Stainless Steel NRS – non-rising stem, resilient seated gate valves Elastomers: EPDM, Silicone and Buna-N OSY – UL/FM outside stem and yoke resilient seated gate valves Torsion Spring Checks: Noryl®, Stainless Steel Check Discs: Reversible Silicone or EPDM BFG – UL/FM grooved gear operated butterfly valves with tamper switch QT – 21⁄2" and 3" (65 and 80mm) quarter-turn ball valves Test Cocks: Bronze Body Nickel Plated Pins
PAGE 3
Dimensions — Weight continued J C I M D A H G P P1 957QT SIZE (DN) DIMENSIONS A in. 1 2 ⁄2 3 mm in. 65 80 15 C 28 ⁄16 303⁄16 mm in. 735 767 7 4 ⁄8 413⁄16 D mm in. 124 122 7 6 ⁄8 67⁄8 G mm in. 174 174 1 30 ⁄4 301⁄4 H mm in. 768 768 1 24 ⁄2 241⁄2 WEIGHT I mm in. 622 622 9 16 ⁄16 173⁄16 J mm in. 421 437 3 11 ⁄8 111⁄4 M mm in. 289 258 15 20 ⁄16 223⁄16 P mm in. 532 564 5 11 ⁄16 115⁄16 P1 mm in. mm lbs. kgs.
PAGE 4
For Technical Assistance Call Your Authorized Watts Agent. 815 Chestnut St., North Andover, MA 01845-6098 U.S.A. 978 688-1811 978 794-1848 North East Edwards, Platt & Deely, Inc. Edwards, Platt & Deely, Inc. W. P. Haney Co., Inc. 271 Royal Ave., Hawthorne, NJ 07506 368 Wyandanch Ave., North Babylon, NY 11703 51 Norfolk Ave., South Easton, MA 02375 973 427-2898 631 253-0600 508 238-2030 973 427-4246 631 253-0303 508 238-8353 Mid Atlantic J. B. O’Connor Company, Inc. RMI The Joyce Agency, Inc.