Watts LFN45B-L - Manual

Series LFN45B
Water Pressure Reducing Valves**
Sizes: 1 1 ⁄
4
" – 2" (32 – 50mm)
Series LFN45B Water Pressure Reducing Valves are designed to reduce
incoming water pressure to a sensible level to protect plumbing system com-
ponents 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
• Double union inlet & outlet connections
• 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
Models
LFN45B NPT threaded female inlet x NPT female outlet
LFN4 5BU NPT threaded union inlet x NPT female outlet
LFN4 5BU-S Solder union inlet x NPT female outlet
LFN45BDU
Double Union – NPT threaded union female inlet
and outlet
LFN45BDU-S Double Union – Solder union inlet and outlet
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 copper
silicon alloy body suitable for water supply pressure up to 300psi (20.7 bar). Pro-
vision 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 integral strainer will be acceptable. Approved valves
shall comply with ASSE 1003. Valve shall be a Watts Series LFN45B.
For Residential and Commercial Applications
ES-LFN45B-L
Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location ––––––––––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––––
Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative ––––––––––––––––––––––––––––––––––––––––
Series LFN45BDU – 2" (50mm) size shown
Thermoplastic Seat
Thermal Expansion
Bypass
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.
LEAD FREE
*
Reinforced
Diaphragm
Threaded or
solder ends
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).