Specification Sheet

Series LFN45B
Water Pressure Reducing Valves**
Sizes: 1
1
⁄4" – 2"
Series LFN45B 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
LFN45B 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). 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
• Integral stainless steel strainer
• Thermoplastic seat & cage
• Lead Free* cast copper silicon alloy body
• Serviceable in line
• Bypass feature controls thermal expansion pressure***
• Sealed spring cage on all models for accessible outdoor
or pit installations
Specifications
A Water Pressure Reducing Valve with integral strainer 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. The valve shall feature a Lead Free* cast cop-
per silicon alloy body suitable for water supply pressure up to 300psi
(20.7 bar). 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 pres-
sure in the main supply. Pressure reducing valves with built in bypass
check valves and integral strainer will be acceptable. Approved
valves shall comply with ASSE 1003. Valve shall be a
Watts Series LFN45B.
For Residential and Commercial Applications
Series LFN45BDU – 2" size shown
Thermoplastic Seat
Thermal Expansion
Bypass
Reinforced
Diaphragm
Integral Stainless
Steel Strainer
* 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).
For Residential and Commercial Applications
ES-LFN45B-L
LEAD FREE
*
Job Name
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Approval
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Engineer
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Contractor’s P.O. No.
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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 with-
out 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 information contained herein is not intended to replace the full
product installation and safety information available or the experience
of a trained product installer. You are required to thoroughly read all
installation instructions and product safety information before begin-
ning the installation of this product.
NOTICE