Watts N223BS User Manual
For Commercial, Institutional and Industrial Applications
ES-N223B
Job Name
Job Location
Engineer
Approval
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Series N223B/N223BS
Super Capacity Water Pressure
Reducing Valves*
Sizes: 21⁄2" – 3" (65 – 80mm)
Series N223B and N223BS Super Capacity Water Pressure Reducing
Valves are designed to reduce incoming water pressure to a sensible
level to protect plumbing system components and reduce water consumption. This series is suitable for water supply pressures up to 300psi
(20.7 bar) and may be adjusted from 25 – 75psi (172 – 517 kPa). The
standard setting is 50psi (345 kPa). Series N223B features an enlarged
diaphragm, spring cage and seat orifice for super capacity performance. Series N223BS has the same options as the N223B, except it
is furnished with a strainer. All parts are quickly and easily serviceable
without removing the valve from the line. The standard bypass feature
permits the flow of water back through the valve into the main when
pressures, due to thermal expansion on the outlet side of the valve,
exceed the pressure in the main supply.
Contractor
Approval
Contractor’s P.O. No.
Representative
Available with or without
separate strainer
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Series N223B
Features
• Enlarged diaphragm, spring cage and seat orifice for super
capacity performance
• Bronze body construction
• Serviceable in line
• Series N223BS furnished with separate strainer
• Standard bypass feature controls thermal expansion pressure**
• Sealed spring cage on all models for accessible outdoor or pit installations
Models
N223B NPT threaded female inlet x NPT threaded female outlet
N223BS NPT threaded female inlet with strainer x NPT
For
ES-223.
For 3" (80mm) flanged connections, refer to literature ES-N223F.
threaded female outlet
1
⁄2" – 21⁄2" (15 – 65mm) threaded connections, refer to literature
Specifications
A Water Pressure Reducing Valve shall be installed on the water service pipe near its entrance to the building where supply main pressure exceeds 60psi (413 kPa) to reduce it to 50psi (345 kPa) or lower.
Provision shall be made to permit the bypass flow of water back through
the valve into the main when pressures, due to thermal expansion on
the outlet side of the valve, exceed the pressure in the main supply.
Pressure reducing valves with built-in bypass check valves and strainer
will be acceptable. Approved valves shall comply with ASSE 1003. Valve
shall be a Watts Regulator Company Series N223B or N223BS (with
strainer).
Sensitive spring and large
diaphragm area for accurate
pressure control
Large stainless steel
perforated strainer screen
Disc holder removable for replacement of
disc without dismantling the valve —
no special tools required.
IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIES
FOR LOCAL INSTALLATION REQUIREMENTS
* A water saving test program concluded that reducing the supply pressure from
80-50psi (551-345 kPa) resulted in a water savings of 30%.
** NOTE: The bypass feature will not prevent the pressure relief valve from open-
ing on the hot water supply system with pressures above 150psi (10.3 bar).
Sealed spring cage
Bronze body
construction
Renewable
stainless steel
alloy seat
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.
Materials
Body: Bronze
Seat: Replaceable stainless steel alloy
Strainer Screen: Stainless steel (model N223S)
Diaphragm: Reinforced Buna-N
Valve Disc: EPDM
Capacity
kPa psi
345 50
276 40
207 30
21⁄2"
(65mm)
3"
(80mm)
Pressure – Temperature
Temperature Range: 33°F – 160°F (0.5°C – 71°C)
Maximum Working Pressure: 300psi (20.7 bar)
Adjustable Reduced Pressure Range: 25 – 75psi (172 – 517 kPa)
Standard Reduced Pressure Setting: 50psi (345 kPa)
Standards
Both 21⁄2" and 3" are listed to ASSE 1003 through IAPMO (UPC).
1
The 2
⁄2" is also listed to ASSE 1003 through ASSE.
Options
HP High pressure range 75 – 125psi (172 – 517 kPa)
138 20
121 17.5
103 15
86 12.5
69 10
52 7.5
Reduced Pressure Fall-Off
34 5
17 2.5
0 0
40 80 120 160 200 240 320 400 480 560 640 720 gpm
152 304 456 608 760 912 1216 1520 1824 2128 2432 2736 lpm
I.P. = 83 psi, R.P. = 50 psi Lockup
Flow
A
C
N
L
D
Dimensions — Weights
SIZE (DN) DIMENSIONS WEIGHT
A (N223BS) C D L N (N223BS) N223B N223BS
in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs. lbs. kgs.
21⁄2 65 17 432 103⁄4 273 27⁄8 73 77⁄8 200 5 127 30 13.6 44 20.0
3 80 20
A Watts Water Technologies Company
ES-N223B 1210 © 2012 Watts
3
⁄4 527 123⁄4 324 41⁄8 105 101⁄2 267 63⁄4 172 71 32.2 95 43.0
USA: Tel. (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca
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