Watts 957ZRPDA User Manual
For Health Hazard Applications
ES-957RPDA/957NRPDA/957ZRPDA
Job Name
Job Location
Engineer
Approval
–––––––––––––––––––––––––––––––––––––––––––
–––––––––––––––––––––––––––––––––––––––––
–––––––––––––––––––––––––––––––––––––––––––––
–––––––––––––––––––––––––––––––––––––––––––––
Series 957RPDA,
957NRPDA,
957ZRPDA
Reduced Pressure Detector
Assemblies
Sizes: 21⁄2" – 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 plumbing codes. The 957RPDA, 957NRPDA, 957ZRPDA are normally
used in health hazard applications to protect against backsiphonage and backpressure. The Watts 957RPDA, 957NRPDA,
957ZRPDA are used to monitor unauthorized use of water from
the fire protection system.
Contractor
Approval
Contractor’s P.O. No.
Representative
––––––––––––––––––––––––––––––––––––––––––––
–––––––––––––––––––––––––––––––––––––––––––––
––––––––––––––––––––––––––––––––––––––––
––––––––––––––––––––––––––––––––––
957NRPDAOSY
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
Specifications
The Reduced Pressure Detector Assembly shall consist of two
independent 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 within a sleeve
accessible single housing constructed from 304 (Sch 40) stainless steel pipe with groove end connections. Torsion spring
checks shall have reversible elastomer discs and in operation 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 without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Available Models
Suffix:
OSY – UL/FM outside stem and yoke, resilient
seated gate valves
BFG – UL/FM grooved gear operated butterfly valves
with tamper switch
*OSY FxG – Flanged inlet gate connection and grooved outlet
gate connection
*OSY GxF – Grooved inlet gate connection and flanged outlet
gate connection
*OSY GxG – Grooved inlet gate connection and grooved outlet
gate connection
Available with grooved NRS gate valves - consult factory*
Post indicator plate and operating nut available - consult factory*
*Consult factory for dimensions
Materials
Housing & Sleeve: 304 (Schedule 40) Stainless Steel
Elastomers: EPDM, Silicone and Buna ‘N’
Torsion Spring Checks: Noryl
®
, Stainless Steel
Check Discs: Reversible Silicone or EPDM
Test Cocks: Bronze Body Nickel Plated
Pins & Fasteners: 300 Series Stainless Steel
Springs: Stainless Steel
Pressure — Temperature
Temperature Range: 33°F – 140°F (0.5°C – 60°C)
Maximum Working Pressure: 175psi (12.1 bar)
Approvals
Dimensions — Weight
A
C (open)
D
H
G
1047 B64.4
J
I
(BFG & OSY only)
M
P
957RPDAOSY
SIZE (DN) ¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿ DIMENSIONS WEIGHT
A C (OSY) D G H I J M P 957RPDA 957NRPDA
in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs. lbs. kgs.
21⁄2 65 31 787 163⁄8 416 61⁄2 165 291⁄16 738 211⁄2 546 151⁄2 393 813⁄16 223 219⁄16 548 133⁄16 335 142 64 150 68
3 80 31
4 100 33
6 150 44 1118 30
8 200 50 1270 37
10 250 57
11
⁄16 805 187⁄8 479 611⁄16 170 301⁄4 768 221⁄4 565 171⁄8 435 93⁄16 233 231⁄8 587 141⁄2 368 162 73 175 79
1
⁄2 851 223⁄4 578 7 178 33 838 231⁄2 597 181⁄2 470 915⁄16 252 261⁄2 673 153⁄16 386 178 81 201 91
1
⁄2 1461 453⁄4 1162 113⁄16 285 66 1676 50 1270 321⁄2 826 175⁄16 440 463⁄8 1178 24 610 797 362 964 437
1
⁄8 765 81⁄2 216 443⁄4 1137 333⁄4 857 233⁄16 589 131⁄16 332 323⁄4 832 19 483 312 142 353 160
3
⁄4 959 911⁄16 246 541⁄8 1375 405⁄8 1032 277⁄16 697 1511⁄16 399 371⁄8 943 213⁄16 538 497 225 572 259
J
I
H
G
M
P
957RPDABFG
SIZE (DN) DIMENSIONS WEIGHT
G
in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs.
21⁄2 65 321⁄2 826 211⁄2 546 151⁄2 394 91⁄2 241 2113⁄16 555 1513⁄16 402
3 80 34 864 221⁄4 565 165⁄16 414 101⁄16 256 231⁄8 587 161⁄8 410
4 100 355⁄8 905 231⁄2 597 173⁄16 437 1015⁄16 279 2415⁄16 634 165⁄8 422
6 150 461⁄2 1181 333⁄4 857 201⁄2 521 131⁄2 343 281⁄4 718 19 483
Noryl® is a registered trademark of SABIC Innovative Plastics Holding BV.
H I J M P 957RPDABFG
81 37
84 38
101 46
174 79
Loading...