Specification

Series LFN55B-M1
Water Pressure Reducing Valves**
Sizes:
1
⁄2" – 1"
Series LFN55B-M1 Water Pressure Reducing Valves are
designed to reduce incoming water pressure to protect plumb-
ing system components and reduce water consumption. The
LFN55B features Lead Free* construction to comply with Lead
Free* installation requirements. This series is suitable for water
supply pressures up to 400psi (27.6 bar) and may be adjusted
from 25 to 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
• Lead Free* brass body construction
• Serviceable in line
• Bypass feature controls thermal expansion pressure***
• Sealed spring cage on all models for accessible outdoor or pit
installations
Specifications
Standard 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. 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* brass 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 into the main when pressures, due to thermal expan-
sion 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 Series LFN55B-M1.
Engineering Specification
ES-LFN55B
LFN55BU-M1
LFN55BM1-DU-XL
Integral Stainless
Steel Strainer
Thermoplastic
Seat
Thermal
Expansion Bypass
Reinforced
Diaphragm
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.
* 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 80psi to 50psi (551-345 kPa) resulted in a
water savings.
*** 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).
The information contained herein is not intended to replace the full
product installation and safety information available or the experi-
ence of a trained product installer. You are required to thoroughly
read all installation instructions and product safety information
before beginning the installation of this product.
NOTICE
LEAD FREE
*
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Materials
Body: Lead Free* brass
Seat: Thermoplastic
Cage: Bronze
Integral Strainer: Stainless steel
Diaphragm: Reinforced EPDM
Valve Disc: Elastomer