Watts 909RPDA - Manual

For Health Hazard Applications
ES-909RPDA
Job Name –––––––––––––––––––––––––––––––––––––––––––– Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location –––––––––––––––––––––––––––––––––––––––––– Approval ––––––––––––––––––––––––––––––––––––––––––––––
Engineer –––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. –––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative –––––––––––––––––––––––––––––––––––––––––
Series 909RPDA
Reduced Pressure Detector
Assemblies
Sizes: 2 1 ⁄
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
5 ⁄ 8 " x 3 ⁄ 4 " (16 x 19mm) meter
• 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.
909RPDAOSY
Relief Valve
First
Check
Assembly
Second
Check
Assembly
IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIES
FOR LOCAL INSTALLATION REQUIREMENTS
Now Available
WattsBox Insulated Enclosures.
For more information, send for literature ES-WB.
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 air-
in/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.
Relief Valve Seat
Relief Valve Piston
Relief Valve
Piston Assembly
Wiper Seal
Bottom Plug
Spring Assembly Water Air
Out In
Pipe Line
Center
Relief Valve
Body Flange
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.
ES-909RPDA.qxd 3/2/10 1:43 PM Page 1