Watts LFN45B-EZ User Manual

For Residential and Commercial Applications

ES-LFN45B-EZ

Job Name

Job Location

Engineer

Approval

LEAD FREE

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Series LFN45B - EZ

Water Pressure Reducing Valves

Sizes: 3⁄4" – 1" (20 – 25mm)

Series LFN45B-EZ 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 400psi (27.6 bar) and may be adjusted from 25 – 75psi
(172 – 517 kPa). The standard setting is 50psi (345 kPa).
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. The LFN45-B­EZ features Lead Free* construction to comply with Lead Free*
installation requirements.

Features

• Factory calibrated outlet pressure adjustment

• Easily adjustable pressure setting

• Double union inlet & outlet connections (option DU)

• Integral stainless steel strainer

• Thermoplastic cage & seat

• Lead Free* Copper Silicon Alloy body construction

• Serviceable in line

• Bypass feature controls thermal expansion pressure**

Models

LFN45B-EZ-M1 NPT threaded female inlet x NPT

female outlet

LFN45BU-EZ-M1 NPT threaded union inlet x NPT

female outlet

LFN45BU-EZ-S-M1 Solder union inlet x NPT female

outlet

LFN45BDU-EZ-M1 Double Union – NPT threaded

union female inlet and outlet

LFN45BDU-EZ-S-M1 Double Union – Solder union inlet

and outlet

LFN45BDU-EZ-PEX-M1 Double Union – PEX union inlet

and outlet

LFN45BDU-EZ-CPVC-M1 Double Union – CPVC union inlet

and outlet

* The wetted surface of this product contacted by consumable

water contains less than 0.25% of lead by weight.

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Contractor

Approval

Contractor’s P.O. No.

Representative

Reinforced
Diaphragm

Threaded, Solder,
PEX or CPVC ends

Thermal Expansion
Bypass

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LFN45BDU-EZ-M1

Integral Stainless
Steel Strainer

Thermoplastic Seat

Specifications

A Water Pressure Reducing Valve with integral strainer shall be
installed in 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. Lead Free* Water Pres­sure Reducing Valves
materials. Lead Free* valves shall comply with state codes and
standards, where applicable, requiring reduced lead content.

The valve shall feature a Lead Free* Copper Silicon Alloy body

suitable for water supply pressures up to 400psi (27.6 bar).
Provision shall be made to permit the bypass flow of water back
through the valve back into the main when pressures, due to
thermal expansion on the outlet side of the valve, exceed the
pressure in the main supply. Water Pressure Reducing Valve
with built-in bypass check valves will be acceptable. Approved

valve shall be listed to ASSE 1003 and IAPMO and certified to
CSA B356. Valve shall be a Watts LFN45B-EZ-M1.

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A water saving test program concluded that reducing the supply pres-

sure from 80-50psi (551-345 kPa) resulted in a water savings of 30%.

NOTICE

** 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).

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shall be constructed using Lead Free*

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: Lead Free* Cast Copper Silicon Alloy

Seat: Thermoplastic

Cage: Thermoplastic
Integral Strainer: Stainless steel
Diaphragm: Reinforced EPDM
Valve Disc: Elastomer

Pressure – Temperature

Temperature Range: 33˚F – 180˚F (0.5˚C – 82˚C)
Maximum Working Pressure: 400psi (27.6 bar)

Adjustable Reduced Pressure Range: 25-75psi (172 - 517 kPa)
Standard Reduced Pressure Setting: 50psi (345 kPa)

Standards

Meets requirements of ASSE Standard 1003; (ANSI A112.26.2);
CSA Standard B356; and listed by IAPMO.

Options

Add Suffix

G Gauge tapping
GG Gauge tapping and 160psi (11 bar) gauge

Dimensions - Weights

Capacity

kPa psi

0 0

34.5 5

68.9 10

103.4 15

Pressure Drop

137.8 20

172.3 25

0 10 20 30 40 gpm
0 37.3 75.7 113.6 151.4 lpm

Flow

FNPT

ENPT

FSWEAT

C

FEMALE NPT THREAD
BOTH ENDS OF BODY

ESWEAT

FPEX

D

EPEX

A

A + E

G

FCPVC

A + E + E

ABOVE VALVE SHOWN WITH SINGLE NPT UNION CONNECTION ON INLET

VALVES MAY BE ORDERED WITH 0,1,OR 2 UNION CONNECTIONS USING ANY
COMBINATION OF NPT, SOLDER, PEX OR CPVC CONNECTIONS REQUIRED

“F” DIMENSIONS ARE APPROXIMATE ENGAGEMENT LENGTHS.

SIzE (DN) DIMENSIONS WEIGHT

A C D

in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs kg

1

⁄2 15

37⁄16

3

⁄4 20

1 25

88 43⁄8 111 111⁄16 43 5⁄8 16 5⁄8 15

37⁄16

88 43⁄8 111 111⁄16 43 5⁄8 16

41⁄8

105 43⁄8 111 111⁄16 43 3⁄4 20 1 26 11⁄8 29 11⁄16 26

ENPT

7⁄8 21

ESWEAT

EPEX

13⁄16 21
15⁄16 24

9⁄16 15
13⁄16 21

ECPVC

1⁄2 13

9

11⁄16 17

FNPT

⁄16 14

FSWEAT

1⁄2 13

3

⁄4 19

15⁄16 23

ECPVC

5⁄8 16
5⁄8 16

13

⁄16 21

FPEX

FCPVC G

1⁄2 13 21⁄4 57 1.75 .79
3⁄4 18 21⁄4 57 1.75 .79
15⁄16 23 21⁄4 57 2 .91

A Watts Water Technologies Company

USA: Tel. [phone] • Fax: [phone] • www.watts.com

Canada: Tel. [phone] • Fax: [phone] • www.watts.ca

ES-LFN45B-EZ 1322 © 2013 Watts