ES-N55B

For Residential and Commercial Applications

Job Name –––––––––––––––––––––––––––––––––––––––––––

Job Location –––––––––––––––––––––––––––––––––––––––––

Engineer –––––––––––––––––––––––––––––––––––––––––––––

Approval –––––––––––––––––––––––––––––––––––––––––––––

Series N55B-M1

Water Pressure Reducing Valves*

Sizes:

1

⁄

2

" – 1" (15 – 25mm)

Series N55B-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 to 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

• 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

N55B-M1

N55BU-M1

N55BU-S-M1

N55BU-QC-M1

N55BDU-M1

NPT threaded female inlet x NPT female outlet

NPT threaded union inlet x NPT female outlet

Solder union inlet x NPT female outlet

Single Union – QC union inlet

N55BDU-S-M1

Double Union – NPT threaded union female inlet and outlet

Double Union – Solder union inlet and outlet

N55BDU-PEX-M1 Double Union – PEX union inlet and outlet

N55BDU-CPVC-M1 Double Union – CPVC union inlet and outlet

N55BDU-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).

Contractor ––––––––––––––––––––––––––––––––––––––––––––

Approval –––––––––––––––––––––––––––––––––––––––––––––

Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––

Representative ––––––––––––––––––––––––––––––––––––––––

Reinforced

Diaphragm

N55BU-M1

Threaded, solder,

PEX, CPVC, or QC ends

Thermal Expansion

Bypass

Integral Stainless

Steel Strainer

Thermoplastic Seat

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 N55B-M1.

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.

Materials

Body:

Seat:

Bronze

Thermoplastic

Cage: Bronze

Integral Strainer: Stainless steel

Diaphragm:

Valve Disc:

Reinforced EPDM

Elastomer

Pressure — Temperature

Temperature Range: 33°F – 180°F (0.5°C – 82°C)

Maximum Working Pressure: 400psi (27.6 bar)

Adjustable Reduced Pressure Range: 25 – 75psi

(172 – 517 kPa)

Standard Reduced Pressure Setting: 50psi (345 kPa)

Standards

Meets requirements of ASSE Standard 1003; (ANSI A112.26.2) and CSA Standard B356. Listed by IAPMO and City of Los

Angeles.

Options

Add Suffix

G

GG

LP

Gauge tapping

Gauge tapping and 160psi (11 bar) gauge

Low Pressure Range 10-35psi (69-241 kPa)

Dimensions – Weights

Capacity

kPa psi

0 0

34.5 5

68.9 10

103.4 15

137.8 20

172.3 25

0 37.3 75.7 113.6 151.4

Flow

F

NPT

E

NPT

F

SWEAT

E

SWEAT

F

PEX

C

FEMALE NPT THREAD

BOTH ENDS OF BODY

E

PEX

F

CPVC

D

A

A + E

A + E + E

ABOVE VALVE SHOWN WITH SINGLE NPT UNION CONNECTION ON INLET

VALVES MAY BE ORDERED WITH 0,1,OR 2 UNION CONNECTIONS USING ANY

COMBINATION OF NPT, SOLDER, PEX OR CPVC CONNECTIONS REQUIRED

“F” DIMENTIONS ARE APPROXIMATE ENGAGEMENT LENGTHS.

G

E

F

CPVC

QC

E

QC

SIzE (DN)

1 25 4 1 ⁄

8

105 4 9 ⁄

16

116 1 11 ⁄

16

43

DIMENSIONS

3 ⁄

4

20 1 26 1 1 ⁄

8

29 1 1 ⁄

16

26 1 11 ⁄

16

43

WEIGHT

A C D E

NPT

E

SWEAT

E

PEX

E

CPVC

E

QC

F

NPT

F

SWEAT

F

PEX

F

CPVC

F

QC

G in. mm in.

mm in. mm in.

mm in. mm in. mm in.

mm in. mm in.

mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs.

1 ⁄

2

15 3 7 ⁄

16

88 4 9 ⁄

16

116 1 11 ⁄

16

43 5 ⁄

8

16 5 ⁄

8

15 13 ⁄

16

21 9 ⁄

16

15 1 7 ⁄

16

36 1 ⁄

2

13 1 ⁄

2

13 5 ⁄

8

16 1 ⁄

2

13 1 1 ⁄

2

38 2 1 ⁄

4

57 2

.

91

3 ⁄

4

20 3 7 ⁄

16

88 4 9 ⁄

16

116 1 11 ⁄

16

43 5 ⁄

8

16 7 ⁄

8

21 15 ⁄

16

24 13 ⁄

16

21 1 9 ⁄

16

40 9 ⁄

16

14 3 ⁄

4

19 5 ⁄

8

16 3 ⁄

4

18 1 11 ⁄

16

42 2 1 ⁄

4

57 2

.

91

11 ⁄

16

17 15 ⁄

16

23 13 ⁄

16

21 15 ⁄

16

23 1 3 ⁄

4

45 2 1 ⁄

4

57 3 1.36

A Watts Water Technologies Company

ES-N55B 1210

USA: Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com

Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca

© 2012 Watts