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Item # NR3, Model NR3 Water Pressure Reducing Valve with Integral By-pass Check Valve and Strainer

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Designed for installation on potable water lines to reduce high inlet pressure to a lower outlet pressure. The integral strainer makes this device most suitable for residential and commercial water systems that require frequent cleaning of sediment and debris. The direct acting integral by-pass design prevents buildup of excessive system pressure caused by thermal expansion. The balance piston design enables the regulator to react in a smooth and responsive manner to changes in system flow demand, while at the same time, providing protection from inlet pressure changes.

Standards Compliance
  • ASSE® Listed 1003
  • IAPMO® Listed
  • CSA® Certified
Typical Installation
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 (i.e.: 200 psi inlet reduced to 50 psi outlet). CAUTION: Anytime a reducing valve is adjusted, a pressure gauge must be used downstream to verify correct pressure setting. Do not bottom adjustment bolt on bell housing.

The Water Pressure Reducing Valve shall be ASSE® Listed 1003, and available with single union, double union and less union end connections. The main body shall be cast bronze (ASTM B 584) alloy. The bell shall be composite plastic. The cartridge shall be acetal and incorporate an integral seat. The seat disc elastomer shall be EPDM. The assembly shall be accessible for maintenance without removing the device from the line. The Water Pressure Reducing Valve shall be a WILKINS Model NR3.



1/2 in
1 1/4
1 1/2

Main Valve Body

Cast bronze ASTM B 584, UNS C84400

Bell Housing

UV resistant polymer composite


Stainless steel, 300 Series


Brass ASTM B 16


EPDM (FDA approved)
Buna nitrile (FDA approved)


Delrin™ (NSF Listed)


Oil temp wire, ASTM A 229

Strainer Screen

300 Series Stainless Steel

Maximum Working Water Pressure

300 psi (1 1/2" - 2")
400 psi (1/2" - 1 1/4")

Minimum Inlet Pressure (As Per UPC Code)

80 psi

Maximum Working Water Temperature

140 ºF

Reduced Pressure Range

15 to 75 psi (1/2" - 1 1/4")
25 to 75 psi (1 1/2" - 2")

Factory Preset

50 psi

Threaded Connections (FNPT)

ANSI B1.20.1

Copper Connections (FC)

ANSI B16.22

Maximum Hot Water Temperature at 100 psi (CPVC Tailpiece)

140 ºF

Cold Water Rated Temperature at 400 psi (CPVC Tailpiece)

73.4 ºF


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item-5277, Repair Kit
NR3DUSPC, Steel Pipe
NR3DUSPC, Steel Pipe
TPK, Tailpiece Kit


C - With FC (Copper Sweat) Union Connection
CPVC - CPVC tailpiece connection (1")

DM - With Double Male 3/4" & 1" Meter Threads Connection

DMSS - DM with SS Spring & Sealed Cage

DU - With Double Union Connection (FNPT)

G - Tapped with Gauge

HRSC - High Range 15-150 PSI (1/2"-1 1/4" only) with Sealed Cage

LU - With Integral FNPT Connection (No union)

P - Tapped and Plugged for Gauge

PEX - With Male Barbed Connection Tailpiece for Crossed-linked Polyethylene Tubing

SC - With SS Adjustment Bolt and Lock Nut, with SS Spring for below-ground Installations

Standard with Single Union FNPT Connection and 20 Mesh Strainer Screen


·  Flow Characteristics

·  NR3 PEX & Typical Installation

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