Specifications

5
Tech Support: 855-ONE-ZURN
www.zurn.com
• 1/2”, 3/4”, 1”, 1
1
/
4
”, 1
1
/
2
”, 2”
• Pressure rated 400 psi (1/2” – 1
1
/
4
”), 300 psi (1
1
/
2
”, 2”)
• Spring range 15 to 75 psi (1/2” – 1
1
/
4
”), 25 to 75 psi (1
1
/
2
”, 2”)
• Factory set at 50 psi
• Maximum temperature 180°F
• Low lead alloy body and composite bell housing
• Replaceable acetal cartridge with integral stainless steel strainer
• Built-in by-pass prevents buildup of excessive system pressure caused by
thermal expansion
• Nylon reinforced Buna-N diaphragm
• Balanced piston design
• May be installed in any position
• All internal parts corrosion-resistant and included in a drop-in cartridge
• Short lay length makes for easy retrofit
• No special tools required
• Serviceable in-line
• Available tapped and plugged for gauge (optional)
• Available tapped with gauge (optional)
• ASSE
®
Listed 1003, IAPMO
®
Listed
• NSF
®
Standard 61 Certified
• California AB 1953 compliant
Model NR3XL Single union with FNPT tailpiece, inlet and outlet
both male threaded for union on either or both
sides
Model NR3XLC Union end connection in female copper sweat
Model NR3XLDU Double union with two FNPT tailpieces and
union nuts
Model NR3XLDUC Double union with two female copper sweat
tailpieces and two union nuts
Model NR3XLDULU Less tailpieces and union nuts, female iron pipe
thread
Model NR3XLSC Sealed cage bell and stainless steel adjusting
screw. For below-ground and indoor
applications
Model NR3XLPEX Union end supplied with male barb connection
tailpiece for cross-linked polyethylene (PEX)
tubing (1/2”, 3/4” and 1)
Model NR3XLDUPEX Supplied with two male barb connection
tailpieces for cross-linked polyethylene (PEX)
tubing (1/2”, 3/4” and 1)
OptionsTypical Installation Features Applications
Designed with low lead construction, the NR3XL is compliant with California Assembly Bill 1953 which
states that the weighted average surface area shall contain less that 0.25% lead. Additionally, the valve
is NSF 61 approved. Embodying all of the features and benefits of the NR3, the NR3XL, with its low
lead construction, is the ideal valve for residential and commercial drinking water systems. Removal of
lead from drinking water systems is in the best health interest of all who come in contact with water,
and the NR3XL is the perfect valve to accomplish this goal.
 Special plastic spacer nipple for use with 1/2”, 3/4” and 1
1
/
4
” NR3
double union regulators (Model NR3DUSPC)
 Special spacer nipple for use with 1” NR3XL double union regulators
(Model 70DUSPC)
 Special spacer nipple for use with 1
1
/
2
” and 2” NR3 double union
regulators (Model NR3DUSPC)
Local codes shall govern installation requirements. Unless otherwise specified, the assembly shall be mounted in accordance with the latest edition of the
Uniform Plumbing Code. The Model NR3XL may be installed in any position. If installed in a pit, vault, or indoors, specify the “SC” sealed cage option.
The assembly shall be installed with sufficient side clearance for testing and maintenance. Multiple installations are rec-
ommended for wide demand variations or where the desired pressure reduction is more than 4 to 1 (ie: 200 psi inlet
reduced to 50 psi outlet). CAUTION: Anytime a reducing valve is adjusted, a pressure gauge (Model HGI-25) must be
used downstream to verify correct pressure setting. Do not bottom out adjustment bolt on bell housing.
 Pressure gauges (Model 92-25)
For other tailpiece options, see page 15.
For Additional Information, including flow curves, reference
WK-RC catalog or visit our web site.
NR3XL Series
Accessories
MODEL 375XL
BACKFLOW PREVENTER
MODEL SXL
STRAINER
MODEL 850XL
SHUT OFF
DIRECTION OF FLOW
WATER
METER
SHUT-OFF
VALVE
MODEL
BR4XL
HOSE BIBB
MODEL 975XL
BACKFLOW
PREVENTER
WATER
METER
HOSE BIBB
MODEL BR4XL
REGULATOR
SHUT-OFF
MODEL WXTP
EXPANSION
TANK
WATER
HEATER
MODEL TP1100A
T & P VALVE
DIRECTION OF FLOW
MODEL BFP-8
HOSE BIBB VACUUM
BREAKER
MODEL YB
STRAINER
TAILPIECE
UNION NUT
TYP. STUD BAY OR
EXPOSED WALL
CRIMP RING
DIRECTION OF FLOW
SUPPORT
UNION
GASKET
NR3XL PEX INSTALLATION
MODEL NR3XL
REGULATOR
Water Pressure Reducing Valves