Watts LFN223BS User Manual
For Commercial, Institutional and Industrial Applications
ES-LFN223B
Job Name
Job Location
Engineer
Approval
LEAD FREE
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*
Series LFN223B,
LFN223BS
Super Capacity Water Pressure
Reducing Valves**
Sizes: 21⁄2" – 3"
Series LFN223B and LFN223BS 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. The LFN223B/LFN223BS features Lead Free* construction to
comply with Lead Free* installation requirements. 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 LFN223B features an enlarged diaphragm, spring cage and
seat orifice for super capacity performance. Series LFN223BS has the
same options as the LFN223B, except it is furnished with a Lead Free*
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.
Features
Contractor
Approval
Contractor’s P.O. No.
Representative
Available with or without
separate strainer
Sensitive spring and large
diaphragm area for accurate
pressure control
Large stainless steel
perforated strainer screen
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Bypass
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Series LFN223B
Sealed spring cage
Lead Free*
brass body
construction
• Enlarged diaphragm, spring cage and seat orifice for super
capacity performance
• Lead Free* cast copper silicon alloy body construction
• Serviceable in line
• Series LFN223BS furnished with separate Lead Free* strainer
• Standard bypass feature controls thermal expansion pressure***
• Sealed spring cage on all models for accessible outdoor or pit installations
Disc holder removable for replacement of
disc without dismantling the valve —
no special tools required.
Specifications
A Lead Free* 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. The water pressure reducing valve shall be constructed using
Lead Free* materials. Lead Free* regulators shall comply with state
codes and standards, where applicable, requiring reduced lead content.
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 Series LFN223B or LFN223BS (with strainer).
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.
NOTICE
Inquire with governing authorities for local installation requirements
* The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
** A water saving test program concluded that reducing the supply
pressure from 80-50psi (551-345 kPa) resulted in a water savings
of 30%.
*** The bypass feature will not prevent the pressure relief valve from
opening on the hot water supply system with pressure above
150psi (10.3 bar).
Renewable
stainless steel
alloy seat
Models
21⁄2" LFN223M2-B NPT threaded female inlet x NPT threaded female outlet
3" LFN223M1-B NPT threaded female inlet x NPT threaded female outlet
1
2
⁄2" LFN223M2-BS NPT threaded female inlet with strainer x NPT threaded female outlet
3" LFN223M1-BS NPT threaded female inlet with strainer x NPT threaded female outlet
1
⁄2" – 21⁄2" threaded connections, refer to literature ES-LF223.
For
For 3" flanged connections, refer to literature ES-LF223F.
Capacity
Materials
Body: Lead Free* cast copper silicon alloy
Seat: Replaceable stainless steel alloy
Strainer Screen: Stainless steel (model LFN223S)
Diaphragm: Reinforced Buna-N
Valve Disc: EPDM
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.
1
Both 2
⁄2" and 3" are listed to NSF 61-G
Options
HP High pressure range 75 – 125psi (172 – 862 kPa)
1
2
⁄2" HP, LP, G and GC options
3" HD option
kPa psi
345 50
276 40
207 30
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
21⁄2"
(65mm)
A
Flow
3"
(80mm)
C
N
L
D
Dimensions — Weights
SIZE WEIGHT
A (LFN223BS) C D L N (LFN223BS) LFN223B LFN223BS
in in. mm in. mm in. mm in. mm in. mm lbs. kgs. lbs. kgs.
21⁄2 17 432 103⁄4 273 27⁄8 73 77⁄8 200 5 127 30 13.6 44 20.0
3 20
A Watts Water Technologies Company
ES-LFN223B 1329 © 2013 Watts
3
⁄4 527 123⁄4 324 41⁄8 105 101⁄2 267 63⁄4 172 71 32.2 95 43.0
DIMENSIONS
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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