Watts LF25AUB-Z3 User Manual

For Residential and Commercial Applications

ES-LF25AUB

Job Name

Job Location

Engineer

Approval

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LEAD FREE

Contractor

Approval

Contractor’s P.O. No.

Representative

Series LF25AUB-Z3

Water Pressure Reducing Valves**

Sizes: 1⁄2" – 2" (15 – 50mm)

Series LF25AUB-Z3 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 300psi (20.7 bar) and may be adjusted from 25 – 75psi (172 – 517 kPa). The LF25AUB-Z3 features Lead Free* construction to comply with Lead Free* installation requirements. 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

• Standard construction includes Z3 sealed spring cage and stainless steel

corrosion resistant adjusting & cage screws for accessible outdoor or pit installations

• Union inlet connection

• Integral stainless steel strainer

• Replaceable seat module

• Lead Free* cast copper silicon alloy construction

• Serviceable in line

• Bypass feature controls thermal expansion pressure***

• High temperature resistant reinforced diaphragm for hot water

Models

LF25AUB-Z3 NPT threaded female union inlet x NPT female outlet LF25AUB-S-Z3 Solder union inlet x NPT female outlet LF25AUB-DU-Z3 Double Union – NPT threaded union female inlet and outlet LF25AUB-S-DU-Z3 Double Union – Solder union inlet and outlet

LF25AUB-DU-THDxPEX-Z3 and PEX union outlet

LF25AUB-DU-LF-Z3 Double union body less fittings (3/4", 1", 11/4") LF25AUB-QC-Z3 Single Union – Quick-Connect union inlet ( LF25AUB-DU-QC-Z3 Double Union – Quick-Connect inlet and outlet

(1/2", 3/4", 1")

Double Union – NPT threaded female inlet

/2", 3/4", 1")

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Bypass valve assembly for 1 (32 – 50mm) sizes

Union inlet connection

Integral stainless steel strainer

⁄4" – 2"

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LF25AUB-Z3

EPDM diaphragm

Bypass for

⁄2" – 1" (15 – 25mm) sizes

Replaceable seat module

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 water pressure reducing valve shall be constructed using Lead Free* materials. Lead Free* regulators shall comply with state codes and standards, where applicable, requiring reduced lead content. The valve shall feature a Lead Free* cast copper silicon alloy suitable for water supply pressures up to 300psi (20.7 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 LF25AUB-Z3.

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.

* The wetted surface of this product contacted by consumable

water contains less than 0.25% of lead by weight.

** A water saving test program concluded that reducing the supply

pressure from 80-50psi (551-345 kPa) resulted in a water savings of 30%.

*** 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).

Materials

Body: Lead Free* copper silicon alloy Seat:

Integral Strainer: Stainless steel Diaphragm: Reinforced EPDM with PTFE wetted surface Valve Disc: EPDM

⁄2"–1" (15–25mm) Replaceable engineered polymer

(10% glass filled Noryl

⁄4"–2" (32–50mm) Replaceable stainless steel

)

Pressure – Temperature

Temperature Range: 33°F – 160°F (0.5°C – 71°C)

Maximum Working Pressure: 300psi (20.7 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: CSA Standard B356; Southern Standard Plumbing Code and listed by IAPMO. Military Standard MIL-V-18146B Type I.

Capacity

Sizes: 1⁄2", 3⁄4", 1", 11⁄4", 11⁄2", 2"

kPa psi

0 0

34 5

69 10

103 15

(15, 20, 25, 32, 40, 50mm)

Options

Add Suffix

G Gauge tapping, 1⁄8" (3mm) GG Gauge tapping and 160psi (11 bar) gauge

HP High pressure range 75–125psi (5.2 – 8.6 bar)

LP Low pressure range 10–35psi (69 – 241 kPa) Z7 400psi (27.6 bar) initial pressure,

Noryl® is a registered trademark of SABIC Innovative Plastics™

⁄2" (20mm) models only

138 20

Reduced Pressure Drop

172 25

0 10 20 30 40 50 60 70 80 90 100 gpm 0 38 76 114 152 190 228 266 304 342 380 lpm

⁄2”

⁄4”

1”

11⁄4”

11⁄2”

Flow

F* (Max)

Dimensions — Weights

FQC

A - LF25AUB-Z3 A1 - LF25AUB-S-Z3 A2 - LF25AUB-DU-LF-Z3 B - LF25AUB-DU-Z3 B1 - LF25AUB-S-DU-Z3

C (Max)

B2 - LF25AUB-DU-THDxPEX-Z3 ET - NPT Engagement for tight joint ES - Female sweat socket depth EP - PEX end connection

SIZE (DN) DIMENSIONS

A A

in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm

⁄2 15 53⁄8 137 55⁄16 135 53⁄16 132 67⁄16 164 63⁄8 162 – – 7 178

⁄4 20 55⁄16 135 51⁄2 140 51⁄4 133 61⁄2 165 67⁄8 175 63⁄4 171 7 178

FQC - Quick-Connect union

1 A2 B B1

A, A1

B, B1, B2

B2 C

1 25 6 152 61⁄4 159 57⁄8 149 73⁄8 187 713⁄16 198 711⁄16 195 8 203

11⁄4 32 83⁄4 222 815⁄16 227 81⁄4 210 103⁄4 273 11 279 – – 9 229

⁄2 40 83⁄4 222 9 229 81⁄4 210 103⁄4 273 113⁄16 284 – – 91⁄2 241

2 50 9

⁄4 235 10 254 83⁄4 222 115⁄16 287 1211⁄16 322 – – 111⁄4 286

2”

SIZE (DN) DIMENSIONS WEIGHT

D F * G E

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

T ES EP FQC

11⁄2 38 97⁄16 240 31⁄8 79 1⁄2 13 1⁄2 13 – – 11⁄2 38 3.5 1.6 11⁄2 38 97⁄16 240 31⁄8 79 1⁄2 13 3⁄4 19 5⁄8 16 111⁄16 42 3.5 1.6 13⁄4 44 1 07⁄16 266 35⁄8 92 5⁄8 16 15⁄16 23 13⁄16 21 13⁄4 45 6.5 3.0

⁄8 54 117⁄16 291 35⁄8 92 5⁄8 16 1 25 – – – – 10 4.5 23⁄8 60 1115⁄16 304 41⁄16 103 5⁄8 16 11⁄16 28 – – – – 10 4.5 31⁄4 83 1311⁄16 348 43⁄4 121 5⁄8 16 15⁄16 34 – – – – 15 6.8

* Dimension includes optional gauge

A Watts Water Technologies Company

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

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