Watts 909RPDA User Manual
For Health Hazard Applications
ES-909RPDA
Job Name
Job Location
Engineer
Approval
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Series 909RPDA
Reduced Pressure Detector
Assemblies
Sizes: 21⁄2" – 10" (65 – 250mm)
Series 909RPDA Reduced Pressure Detector Assemblies are used in health
hazard applications and are designed exclusively for use in accordance with
water utility authority containment requirements. It is mandatory to prevent
the reverse flow of fire protection system substances, i.e., glycerin wetting
agents, stagnant water and water of non-potable quality from being pumped
or siphoned into the potable water line.
Benefits: Detects leaks ...with emphasis on the cost of unaccountable water;
incorporates a meter which allow the water utility to:
• detect leaks that historically create great annual cost due to waste
• provide a detection point for unauthorized use. It can help locate illegal taps
Modular check design concept facilitates maintenance and assembly access.
All sizes are standardly equipped with AWWA epoxy coated, UL/FM listed OSY
resilient seated gate valves, CFM (cubic feet per minute) or GPM (gallon per
minute) meter and ball type test cocks. A pressure differential relief valve is
located in a zone between the check valves.
Modular Design
Features a modular design concept which facilitates maintenance and
assembly access. All sizes are standardly equipped with gate valves and ball
type test cocks.
Features
• Body construction fused epoxy coated cast iron
• Replaceable bronze seats
• Maximum flow at low pressure drop
• Compact for economy combined with performance
• Design simplicity for easy maintenance
• Furnished with
• Air-in/Water-out relief valve design provides maximum capacity during
emergency conditions.
• No special tools required
Specifications
A Reduced Pressure Detector Assembly shall be installed on fire protection
systems when connected to a public water supply. Degree of hazard present
is determined by the local authority having jurisdiction. The unit shall be a
complete assembly including UL listed and FM approved OSY shutoff valves.
Including an auxiliary line consisting of an approved backflow preventer and
water meter. The assembly shall meet the requirements of AWWA C511-92;
ASSE 1047; UL Classified File No. EX3185; CSA B64 and USC Manual 8th.
Edition. Assembly shall be a Watts Regulator Company Series 909RPDA.
5
⁄8" x 3⁄4" (16 x 19mm) meter
Contractor
Approval
Contractor’s P.O. No.
Representative
909RPDAOSY
First
Check
Assembly
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Relief Valve
Second
Check
Assembly
How it operates
The unique relief valve construction incorporates two channels: one for air,
one for water. When the relief valve opens, as in the accompanying airin/water-out diagram, the right-hand channel admits air to the top of the
reduced pressure zone, relieving the zone vacuum. The channel on the left
then drains the zone to atmosphere. Therefore, if both check valves foul, and
simultaneous negative supply and positive backpressure develops, the relief
valve uses the air-in/water-out principle to stop potential backflow.
Pipe Line
Center
Relief Valve
Body Flange
IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIES
Relief Valve Seat
Relief Valve Piston
Relief Valve
Piston Assembly
Wiper Seal
Bottom Plug
Spring Assembly
FOR LOCAL INSTALLATION REQUIREMENTS
Water Air
Out In
Now Available
WattsBox Insulated Enclosures.
For more information, send for 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 without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Models
Suffix:
OSY – UL/FM outside stem and yoke resilient seated gate valves
CFM – cubic feet per minute meter
GPM – gallons per minute meter
LF – less shutoff valves
Standards
AWWA C511-92; CSA B64
USC Manual for Cross-connection Control, 8th Edition
Approvals
Materials
Discs: Rubber
Body: Epoxy coated cast iron
Seat and Disc Holder: Bronze
Trim: Stainless steel
Test Cocks: Bronze
Pressure — Temperature
Temperature Range: 33°F – 140°F (0.5°C – 60°C) continuous
Maximum Working Pressure: 175psi (12.1 bar)
Dimensions — Weights
1047
Approved by the foundation for Cross-Connection Control and Hydraulic
Research at the University of Southern California.
A
Series 909AG AIR GAPS
When installing a drain line, use Series 909
air gaps on Model 909 backflow preventers.
B
C
Iron Ordering Series/Sizes Dimensions Weight
Body Code A B C
Model in. mm in. mm in. mm lbs kgs
909AG-F 0881378 11⁄4" – 3" 009/909
909AG-K 0881385 4" – 6" 909 63⁄8" 162 95⁄8244 3 76 6.25 2.83
909AG-M 0881387 8" – 10" 909 73⁄8" 187 111⁄4286 4 102 15.50 7.03
1
⁄4" – 2" 009 M1 43⁄8" 111 63⁄4171 2 51 3.25 1.47
1
2" 009 M2
8" – 10" 909 M1
NOTE: Piping for 3" 909 will start from #1 gate valve and connect
at #2 check valve.
C
G
D
E1
L
A
SIZE (DN) DIMENSIONS WEIGHT
ACDD1E,E1GLRTT1
in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs.
21⁄265 421⁄81070 163⁄8416 51⁄4133 41⁄4114 12 305 7 178 261⁄8664 14 356 9 229 75⁄8194 230 104
380421⁄81070 187⁄8479 51⁄4133 41⁄4114 12 305 7 178 261⁄8664 14 356 9 229 75⁄8194 230 104
4 100 551⁄81400 223⁄4578 6 152 57⁄8149 17 432 91⁄2241 37 940 15 381 135⁄8346 113⁄4299 470 213
6 150 66 1664 301⁄8765 6 152 6 152 203⁄4527 141⁄2368 45 1130 16 406 135⁄8346 113⁄4299 798 362
8 200 781⁄21994 373⁄4959 93⁄4248 85⁄8219 26 660 181⁄2470 551⁄41403 17 432 181⁄2470 163⁄8416 1456 660
10 250 935⁄82378 453⁄41162 93⁄4248 85⁄8219 32 813 211⁄2546 671⁄21715 18 457 181⁄2470 163⁄8416 2230 1012
E
(Open)
D1
T1
R
T
2
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