Specifications

4
Tech Support: 855-ONE-ZURN
www.zurn.com
MODEL 375
BACKFLOW PREVENTER
MODEL S
STRAINER
MODEL 850
SHUT OFF
Model NR3 Single union with FNPT tailpiece, inlet and outlet
both male threaded for union on either or both
sides
Model NR3C Union end connection in female copper sweat
Model NR3DU Double union with two FNPT tailpieces and union
nuts
Model NR3DUC Double union with two female copper sweat
tailpieces and two union nuts
Model NR3DULU Less tailpieces and union nuts, female iron pipe
thread
Model NR3SC Sealed cage bell and stainless steel adjusting
screw. For below-ground and indoor
applications
Model NR3PEX Union end supplied with male barb connection
tailpiece for cross-linked polyethylene (PEX)
tubing
Model NR3DUPEX Supplied with two male barb connection
tailpieces for cross-linked polyethylene (PEX)
tubing
• 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
• All bronze 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
As the newest member of the Wilkins pressure reducing valve family, the NR3 is the most versatile
yet. Its cartridge loaded design with integral strainer allow for rapid cleaning and repair, making
the valve most suitable for residential and commercial applications that require minimal downtime
for maintenance. Both ends of the regulator are threaded for unions and female NPT, allowing for
a tremendous number of end connection options. As with all Wilkins pressure reducing valves, the
NR3 reduces pressure in both flowing and non-flowing applications.
 Special plastic spacer nipple for use with 1/2”, 3/4” and 1
1
/
4
” NR3
double union regulators (Model BR4DUSPC)
 Special spacer nipple for use with 1” NR3 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 NR3
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 recommended 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 gauge (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.
OptionsAccessoriesTypical Installation
NR3 Series
Features Applications
MODEL NR3
REGULATOR
Water Pressure Reducing Valves