For Health Hazard Applications
ES-LF957RPDA
Job Name
Job Location
Engineer
Approval
LEAD FREE
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*
Series LF957RPDA,
LF957NRPDA,
LF957ZRPDA
Reduced Pressure Detector
Assemblies
Sizes: 21⁄2" – 10"
Series LF957RPDA, LF957NRPDA, LF957ZRPDA Reduced
Pressure Detector Assemblies provide protection to the potable
water system from contamination in accordance with national
plumbing codes. The LF957RPDA, LF957NRPDA, LF957ZRPDA are normally used in health hazard applications to protect
against backsiphonage and backpressure. The Watts LF957RPDA, LF957NRPDA, LF957ZRPDA are used to monitor unauthorized use of water from the fire protection system. They feature
Lead Free* construction to comply with Lead Free* installation
requirements.
Features
• Lead Free* construction
• 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
Contractor
Approval
Contractor’s P.O. No.
Representative
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LF957RPDA-OSY
Specifications
The Lead Free* 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 Lead Free* Reduced Pressure
Detector Assemblies shall comply with state codes and standards, where applicable, requiring reduced lead content. The
bypass assembly consists of a meter registering either gallon or
cubic measurements, a double check assembly and required
test cocks. Assembly shall be Watts Series LF957RPDA, LF957NRPDA, LF957ZRPDA.
*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.
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: Lead Free Silicon Copper Alloy Body Nickel Plated
(Only Center TC)
Pins & Fasteners: 300 Series Stainless Steel
Springs: Stainless Steel
Pressure — Temperature
Temperature Range: 33°F – 110°F (0.5°C – 43°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
LF957RPDAOSY
SIZE DIMENSIONS WEIGHT
in. in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs. lbs. kgs.
21⁄2 31 787 163⁄8 416 61⁄2 165 291⁄16 738 22 559 151⁄2 393 813⁄16 223 219⁄16 548 133⁄16 335 142 64 150 68
3 31
4 33
6 43
8 50 1270 37
10 57
A C (OSY) D G H I J M P 957RPDA 957NRPDA
11
⁄16 805 187⁄8 479 611⁄16 170 301⁄4 768 223⁄4 578 171⁄8 435 93⁄16 233 231⁄8 587 141⁄2 368 162 73 175 79
11
⁄16 856 223⁄4 578 7 178 33 838 24 610 181⁄2 470 915⁄16 252 261⁄2 673 153⁄16 386 178 81 201 91
1
⁄2 1105 301⁄8 765 81⁄2 216 443⁄4 1137 333⁄4 857 233⁄16 589 131⁄16 332 323⁄4 832 19 483 312 142 353 160
1
⁄2 1460 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
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
LF957RPDABFG
SIZE DIMENSIONS WEIGHT
in. in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs.
21⁄2 321⁄2 826 231⁄2 597 151⁄2 394 91⁄2 241 2113⁄16 555 1513⁄16 402 81 37
3 34 864 24
4 35
6 46
Noryl® is a registered trademark of SABIC Innovative Plastics™.
G H I J M P 957RPDABFG
1
5
⁄8 905 26 660 173⁄16 437 1015⁄16 279 2415⁄16 634 165⁄8 422 101 46
1
⁄2 1181 3512⁄16 908 201⁄2 521 131⁄2 343 281⁄4 718 19 483 174 79
⁄2 622 165⁄16 414 101⁄16 256 231⁄8 587 161⁄8 410 84 38
Capacity
Series LF957RPDA, LF957NRPDA, LF957ZRPDA flow curves as tested by Underwriters Laboratory per UL 1469, 1996.
Flow characteristics collected using butterfly shutoff valves
** = Rated flow *** = UL Rated flow
Horizontal N-Pattern Z-Pattern
kPa psi
124 18
110 16
96 14
83 12
69 10
55 8
41 6
0 50 100 150 200 250 300 350 gpm
0 190 380 570 760 950 1140 1330 lpm
15 fps
4.6 mps
kPa psi
110 16
96 14
83 12
69 10
55 8
41 6
0 100 200 300 400 500 gpm
0 380 760 1140 1520 1900 lpm
15 fps
4.6 mps
21⁄2"
*
3"
*
**
**
kPa psi
Z
N
H
N
Z
H
124 18
110 16
96 14
83 12
69 10
55 8
41 6
kPa psi
124 18
110 16
96 14
83 12
69 10
55 8
41 6
0 300 600 900 1200 1500 gpm
0 1140 2280 3420 4560 5700 lpm
15 fps
4.6 mps
0 500 1000 1500 2000 2500 gpm
0 1900 3800 5700 7600 9500 lpm
15 fps
4.6 mps
6"
8"
*
*
**
**
Z
N
H
Z
N
H
kPa psi
179 26
152 22
124 18
96 14
69 10
41 6
0 100 200 300 400 500 600 700 800 gpm
0 380 760 1140 1520 1900 2280 2660 3040 lpm
15 fps
4.6 mps
4"
*
**
kPa psi
Z
N
H
110 16
96 14
83 12
69 10
55 8
41 6
28 4
0 500 1000 1500 2000 2500 3000 3500 gpm
0 1900 3800 5700 7600 9500
fps
mps
10"
*
**
11400 13300
Z
N
H
lpm
NOTICE
Inquire with governing authorities for local installation
requirements
A Watts Water Technologies Company
ES-LF957RPDA 1334 © 2013 Watts
USA: Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca
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