Instruction Manual

Series LFN45B-M1
Water Pressure Reducing Valves**
Sizes:
1
⁄2" – 1" (15 – 25mm)
Series LFN45B-M1 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 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 remov-
ing 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
• Double union inlet & outlet connections (option DU)
• Integral stainless steel strainer
• Thermoplastic seat & cage
• Lead Free* cast copper silicon alloy body construction
• Serviceable in line
• Bypass feature controls thermal expansion pressure***
• Sealed spring cage on all models for accessible outdoor or pit installations
Models
LFN45B-M1 NPT threaded female inlet x NPT female outlet
LFN45BU-M1 NPT threaded union inlet x NPT female outlet
LFN45BU-S-M1 Solder union inlet x NPT female outlet
LFN45BU-QC-M1 Single Union – QC union inlet
LFN45BDU-M1 Double Union – NPT threaded union female inlet
and outlet
LFN45BDU-S-M1 Double Union – Solder union inlet and outlet
LFN45BDU-PEX-M1 Double Union – PEX union inlet and outlet (
3
/4" and 1" only)
LFN45BDU-CPVC-M1 Double Union – CPVC union inlet and outlet (
3
/4" and 1" only)
LFN45BDU-QC-M1 Double Union – QC union inlet and outlet (
3
/4" and 1" only)
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 construct-
ed 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 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 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 and integral strainer will be acceptable. Approved valve shall be listed to
ASSE 1003 and IAPMO and certified to CSA B356. Valve shall be a Watts Series
LFN45B-M1.
For Residential and Commercial Applications
ES-LFN45B
LFN45BDU-M1
Integral Stainless
Steel Strainer
Thermoplastic Seat
Thermal Expansion
Bypass
Threaded, solder
PEX, CPVC, or QC ends
Reinforced
Diaphragm
LEAD FREE
*
* 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).
Job Name
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Contractor
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Job Location
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Approval
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Engineer
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Contractor’s P.O. No.
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Approval
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Representative
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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.