Watts 957ZRPDA User Manual download pdf

For Health Hazard Applications

ES-957RPDA/957NRPDA/957ZRPDA

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 957RPDA,

957NRPDA,

957ZRPDA

Reduced Pressure Detector

Assemblies

Sizes: 2

⁄2" – 10" (65 – 250 mm)

Series 957RPDA, 957NRPDA, 957ZRPDA Reduced Pressure

Detector Assemblies provide protection to the potable water

system from contamination in accordance with national plumb-

ing codes. The 957RPDA, 957NRPDA, 957ZRPDA are normally

used in health hazard applications to protect against back-

siphonage and backpressure. The Watts 957RPDA, 957NRPDA,

957ZRPDA are used to monitor unauthorized use of water from

the fire protection system.

Features

• Extremely compact design

• 70% lighter than traditional designs

• 304 (Schedule 40) stainless steel housing & sleeve

• Groove fittings allow integral pipeline adjustment

• Patented torsion spring check provides lowest pressure loss

• Unmatched ease of serviceability

• Replaceable check disc rubber

• Available with grooved butterfly valve shutoffs

• Bottom mounted cast stainless steel relief valve

• Metered bypass to detect leakage or theft of water from the

fire sprinkler system

957NRPDAOSY

Specifications

The Reduced Pressure Detector Assembly shall consist of two

independent torsion spring check modules, a differential pres-

sure 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 within a sleeve

accessible single housing constructed from 304 (Sch 40) stain-

less steel pipe with groove end connections. Torsion spring

checks shall have reversible elastomer discs and in opera-

tion produce drip tight closure against reverse flow caused by

backpressure or backsiphonage. The bypass line shall include

a meter, small diameter reduced pressure zone assembly and

isolation valves. Assembly shall be Watts Series 957RPDA,

957NRPDA, 957ZRPDA.

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.

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Summary of Contents

Page 1 - 957ZRPDA

For Health Hazard ApplicationsES-957RPDA/957NRPDA/957ZRPDAJob Name ––––––––––––––––––––––––––––––––––––––––––– Contractor –––––––––––––––––––––––

Page 2 - Approvals

Available ModelsSuffix:OSY – UL/FM outside stem and yoke, resilient seated gate valvesBFG – UL/FM grooved gear operated butterfly valves with

Page 3 - 2" (65mm)

0 100 200 300 400 500 gpm0 380 760 1140 1520 1900 lpm 7.5 15 fps 2.3 4.6 mps3" (80mm)0 300 600 900 1200 1500 gpm0 1140 2280 3420

Page 4

Related models: 957NRPDA | 957RPDA |

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Watts 957ZRPDA User Manual

Browse online or download User Manual for Accessories for water Watts 957ZRPDA. Watts 957ZRPDA User Manual

Summary of Contents

Related models: 957NRPDA | 957RPDA |

Comments to this Manuals

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