Owner's manual

Series N45B-M1
Water Pressure Reducing Valves*
Sizes:
1
⁄2" – 1" (15 – 25mm)
Series N45B-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.
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.
Features
•Doubleunioninlet&outletconnections(optionDU)
•Integralstainlesssteelstrainer
•Thermoplasticseat&cage
•Bronzebodyconstruction
•Serviceableinline
•Bypassfeaturecontrolsthermalexpansionpressure**
•Sealedspringcageonallmodelsforaccessibleoutdoororpit
installations
Models
N45B-M1 NPT threaded female inlet x
NPT female outlet
N45BU-M1 NPTthreadedunioninletx
NPT female outlet
N45BU-S-M1 SolderunioninletxNPTfemaleoutlet
N45BU-QC-M1 SingleUnion–QCunioninlet
N45BDU-M1 DoubleUnion–NPTthreadedunion
female inlet and outlet
N45BDU-S-M1 DoubleUnion–Solderunioninletand
outlet
N45BDU-PEX-M1 DoubleUnion–PEXunioninletandoutlet
N45BDU-CPVC-M1 DoubleUnion–CPVCunioninletand
outlet
N45BDU-QC-M1 DoubleUnion–QCunioninletandoutlet
* A water saving test program concluded that reducing the supply pressure from
80 – 50psi (551 – 345 kpa) resulted in a water savings of 30%.
** NOTE: 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-N45B
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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N45BDU-M1
Integral Stainless
Steel Strainer
Thermoplastic Seat
Thermal Expansion
Bypass
Threaded, solder
PEX, CPVC, or QC ends
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
without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
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 valve shall
featureabronze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 will
beacceptable.ApprovedvalveshallbelistedtoASSE1003
andIAPMOandcertifiedtoCSAB356.ValveshallbeaWatts
Series N45B-M1.