Watts 994RPDA - Manual

For Health Hazard Applications
ES-994RPDA
Job Name –––––––––––––––––––––––––––––––––––––––––––– Contractor
––––––––––––––––––––––––––––––––––––––––––––
Job Location –––––––––––––––––––––––––––––––––––––––––– Approval ––––––––––––––––––––––––––––––––––––––––––––––
Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. –––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative –––––––––––––––––––––––––––––––––––––––––
994RPDAOSY
Series 994RPDA
Reduced Pressure Detector Assem-
blies
Sizes 2 1 ⁄
2
" – 6" (65 – 150mm)
Series 994RPDA Reduced Pressure Detector Assemblies are designed for use in
accordance with water authority-containment programs. This series is normally used
in health hazard applications to protect against backsiphonage and backpressure. This
series can be used to prevent the reverse flow of fire protection substances, i.e.,
glycerin wetting agents, foam agents, stagnant water, auxiliary supplies and water of
non-potable quality from being pumped or siphoned into the potable water supply.
Features
• Stainless steel construction provides long term corrosion resistance and
maximum strength
• Stainless steel body is half the weight of competitive designs reducing
installation and shipping costs
• Short end to end dimensions makes retrofit easy
• Bottom mounted relief valve reduces clearance requirements when installed
against an outside wall
• Torsion spring check valves provides maximum flow at low pressure drop
• Thermoplastic & stainless steel check valves for trouble-free operation
• No special tools required for servicing
• Compact construction allows for smaller enclosures
• Stainless steel relief valve features a balanced rolling diaphragm to
eliminate sliding seals and lower maintenance costs
• Detects underground leaks and unauthorized water use.
• GPM or CFM meter available
Specifications
A Reduced Pressure Detector Assembly shall be installed at each cross-connection
to prevent backsiphonage and backpressure of hazardous materials into the potable
water supply. The assembly shall consist of a pressure differential relief valve located
in a zone between two positive seating check valves. The main valve body shall be
manufactured from 300 Series stainless steel for corrosion resistance. The check
valves shall be of thermoplastic construction with stainless steel hinge pins, cam
arm, and cam bearing. The check valve shall utilize a single torsion spring design to
minimize pressure drop through the assembly. The check valves shall be modular
and shall seal to the main valve body by the use of an O-ring. There shall be no
brass or bronze parts used within the check assembly or relief valve. The use of seat
screws to retain the check valve seat is prohibited. All internal parts shall be accessible
through a single cover on the valve assembly securely held in place by a two-bolt
grooved coupling. The differential relief valve shall be of stainless steel construction
and shall utilize a rolling diaphragm and no sliding seals. The relief valve shall be
bottom mounted and supplied with a steel reinforced sensing hose. The assembly
shall include two resilient shutoff valves and four ball type test cocks and a hydrauli-
cally balanced bypass line. The bypass line shall include a meter, small diameter
reduced pressure zone assembly and isolation valves. The bypass reduced pressure
assembly shall have a single bolted on cover and top mounted test cocks. The as-
sembly shall be a Watts Series 994RPDA.
IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIES
FOR LOCAL INSTALLATION REQUIREMENTS
Now Available
WattsBox Insulated Enclosures.
For more information, send for literature ES-WB.
Stainless
Steel Cover
Test Cock
Replaceable
Seat
Test Cock Grooved Coupling
Test Cock
Disc
Laser Cut/ Polished Cam Arm
Stainless Steel Relief Valve
Models
Suffix:
LF –
without shutoff valves
OSY – UL/FM outside stem and yoke resilient seated gate valves
*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
CFM –
cubic feet per minute meter
GPM – gallons per minute meter
Available with grooved NRS gate valves - consult factory*
Post indicator plate and operating nut available - consult factory*
*Consult factory for dimensions
Note: The installation of a drain line is recommended. When installing a drain line,
an air gap is necessary.
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.