Watts LF223S User Manual
For Commercial, Institutional and Industrial Applications
ES-LF223
Job Name
Job Location
Engineer
Approval
LEAD FREE
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*
Series LF223, LF223S
High Capacity Water Pressure
Reducing Valves**
Sizes: 1⁄2" – 21⁄2" (15 – 65mm)
Series LF223 and LF223S High 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 LF223/LF223S 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 LF223
features an enlarged diaphragm, spring cage and seat orifice for high
capacity performance. Series LF223S has the same options as the
LF223, except it is furnished with a strainer. All parts are quickly and
easily serviceable without removing the valve from the line. The optional
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
High temperature
resisting diaphragm
for hot or cold water.
Large stainless steel
perforated strainer screen.
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Available with or without
separate strainer
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LF223S
Sealed spring cage
Sensitive spring
and large dia-
phragm area for
accurate
pressure control
Features
• Enlarged diaphragm, spring cage and seat orifice
for super capacity performance
• Lead Free* brass body construction (except 2
• Serviceable in line
• Series LF223S furnished with separate strainer
• Optional bypass feature controls thermal expansion pressure***
• Sealed spring cage on all models for accessible outdoor or pit instatllations.
1
⁄2” (65mm) which is iron)
Models
LF223 NPT threaded female inlet x NPT threaded female outlet
LF223-S
For 21⁄2" – 3" (65 – 80mm) bronze threaded valves,
refer to literature ES-LFN223B.
For 3" (80mm) flanged connections, refer to literature ES-LFN223F.
* The wetted surface of this product contacted by consumable
* *A water saving test program concluded that reducing the supply
*** The bypass feature will not prevent the pressure relief valve from
NPT threaded female inlet with strainer x NPT threaded female outlet
water contains less than 0.25% of lead by weight.
pressure from 80-50psi (551-345 kPa) resulted in a water savings of
30%.
opening on the hot water supply system with pressure above
150psi (10.3 bar).
Lead Free*
brass body
construction
1
⁄2" – 2"
Replaceable
Disc holder removable for replacement of
disc without dismantling the valve —
no special tools required.
stainless seat
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. Sill cocks
and outside wall hydrants may be left on full main pressure at the option
of the owner. 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 builtin bypass check valves
and strainer will be acceptable. Approved valves shall comply with ASSE
1003. Valve shall be a Watts Series LF223 or LF223S (with strainer).
NOTICE
Inquire with governing authorities for local installation
requirements
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
223
223
0 5 10 15 20
PRESSURE FALL OFF - PSI
223
Body: 1⁄2" – 2" (15 – 50mm) Lead Free* Brass
Spring cage: Iron
Bottom plug: Lead free brass
Bottom plug gasket: Buna-N
Seat: Stainless steel
Seat gasket: Buna-N
Adjusting screw: Steel
Locking nut: Brass
Spring button: Cast Iron
Spring: Zinc-plated wire
O-Ring: Buna-N
Diaphragm plate: Cast Iron
Diaphragm: Reinforced Buna-N
Disc holder: Lead free copper silicon alloy
Nameplate: Aluminum
1
2
⁄2" (65mm) Cast Iron
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
1
⁄2" – 2" (15 – 50mm) meets requirements of ASSE Standard 1003;
(ANSI A112.26); CSA Standard B356; Southern Standard Plumbing Code,
Military Standard MIL-V-18146B and listed by IAPMO.
Options
B Builtin bypass feature
LP Low pressure range 10-35psi (69 – 241 kPa)
HP High pressure range, reduced range shown below:
REDUCED PRESSURE RANGE - SUFFIX HP
Size Range
in. mm psi bar
1
⁄2 15 50-145 3.4-10.0
3
⁄4 20 50-145 3.4-10.0
1 25 50-145 3.4-10.0
1
⁄4 32 50-120 3.4-8.3
1
1
⁄2 40 50-95 3.4-6.6
1
2 50 50-95 3.4-6.6
1
⁄2 65 50-95 3.4-6.6
2
Dimensions — Weights
SIZE (DN) DIMENSIONS WEIGHT
A (LF223) As (LF223S) C D N (LF223S) LF223 LF223S
in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs. lbs. kgs.
1⁄2 15 41⁄4 108 9 229 61⁄4 159 2 50 21⁄2 64 4.5 2.0 6 2.7
3
⁄4 20 41⁄4 108 9 229 61⁄4 159 2 50 21⁄2 64 5 2.3 6.5 2.9
1 25 4
1
1
⁄4 32 5 127 1115⁄16 287 63⁄4 172 23⁄4 70 3 76 9 4.1 12 5.4
1
1
⁄2 40 63⁄4 171 143⁄4 375 97⁄8 251 23⁄4 70 37⁄16 87 19.5 8.8 23.5 10.7
2 50 8 203 16
1
2
⁄2 65 9 229 201⁄8 511 103⁄4 273 33⁄8 86 5 127 32.5 14.8 59 26.8
3
⁄4 121 1015⁄16 262 61⁄2 165 21⁄8 54 215⁄ 16 75 7 3.2 9.5 4.3
3
⁄4 425 103⁄4 273 33⁄8 86 4 102 30 13.6 37.5 17.0
Capacity
lpm gpm
304 80
266 70
227 60
190 50
151 40
114 30
Flow
76 20
38 10
0 0
lpm gpm
950 250
760 200
570 150
Flow
379 100
190 50
0 0
N
Series LF223 sizes 1⁄2", 3⁄4", 1" (15, 20, 25mm)
1"
3
⁄4"
1
⁄2"
0 5 10 15 20 psi
0 34 69 103 138 kPa
Pressure Drop
Series LF223 sizes 1
0 5 10 15 20 25 30 psi
0 34 69 103 138 172 207 kPa
1
⁄4", 11⁄2", 2", 21⁄2" (32, 40, 50, 65mm)
21⁄2"
2"
11⁄2"
1
1
⁄4"
Pressure Drop
As
C
D
A
A Watts Water Technologies Company
ES-LF223 1412 © 2014 Watts
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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