Watts 223S User Manual

For Commercial, Institutional and Industrial Applications

ES-223

Job Name

Job Location

Engineer  

Approval

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Series 223, 223-S

High Capacity Water Pressure
Reducing Valves*

Sizes: 1⁄2" – 21⁄2" (15 – 65mm)

Series 223 and 223-S 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. 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 223 features an enlarged diaphragm, spring cage
and seat orifice for high capacity performance. Series 223-S
has the same options as the 223, 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.

Features

•   Enlarged diaphragm, spring cage and seat orifice for super 

capacity performance

•   Bronze body construction (except 2

•   Serviceable in line

•   Series 223-S furnished with separate strainer

•   Optional bypass feature controls thermal expansion pressure**

•   Sealed spring cage on all models for accessible outdoor or 

pit installations.

Models

223 NPT threaded female inlet x NPT threaded female outlet
223-S NPT threaded female inlet with strainer x NPT threaded

female outlet

1

For 2

⁄2" – 3" (65 – 80mm) bronze threaded valves, refer to 

literature ES-N223B.
For 3" (80mm) flanged connections, refer to literature ES-N223F.

1

⁄2" (65mm) which is iron)

Contractor

Approval

  Contractor’s P.O. No.  

Representative

High temperature
resisting diaphragm
for hot or cold water.

Large stainless steel
perforated strainer screen.

Disc holder removable for replacement of
disc without dismantling the valve —
no special tools required.

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Available with or without
separate strainer

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223-S

Sealed spring cage

Sensitive spring

and large dia-

phragm area for

accurate

pressure control

Bronze body
construction

1

⁄2" – 2"

Replaceable

stainless seat

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. 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
built-in bypass check valves and strainer will be acceptable.

Approved valves shall comply with ASSE 1003. Valve shall be 

a Watts Series 223 or 223-S (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.

* 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).

IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIES

FOR LOCAL INSTALLATION REQUIREMENTS

Materials

223

223

0 5 10 15 20

PRESSURE FALL OFF - PSI

223

Body:      1⁄2" – 2" (15 – 50mm) Bronze 

Seat:     Replaceable stainless steel

Strainer Screen:  Stainless steel (model 223-S)

Diaphragm:  Reinforced Buna-N

Valve Disc:  EPDM

1

2

⁄2" (65mm) 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  Built-in 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

1

⁄4 32 50-120 3.4-8.3

1

1

⁄2 40 50-95 3.4-6.6

2 50 50-95 3.4-6.6

1

2

⁄2 65 50-95 3.4-6.6

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

Series 223 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 223 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

Dimensions — Weights

SIZE (DN) DIMENSIONS WEIGHT

A (223) As (223-S) C D N (223-S) 223 223-S

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

A Watts Water Technologies Company

ES-223   1205    © 2012 Watts

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

C

N

A

USA: No. Andover, MA • Tel: [phone] • Fax: [phone]  • www.watts.com

Canada: Burlington, ON • Tel: [phone] • Fax: [phone] •  www.wattscanada.ca

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