WATTS LF25AUB-Z3 Water Pressure Reducing Valves Instruction Manual
- June 8, 2024
- WATTS
Table of Contents
WATTS LF25AUB-Z3 Water Pressure Reducing Valves
Engineering Specification
Job Name
Contractor
Job Location
Approval
Engineer
Contractor’s P.O. No.
Approval
Representative
Water Pressure Reducing Valves*
Sizes: 1⁄2″ – 2″
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
- 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
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.
NOTICE
Product is for interior or exterior applications. Product should not be buried
directly in the ground. For exterior applications where the valve will be
situated in a vault or pit or be in contact with the ground, the valve should
be installed in a meter box/vault, accessible for repair and adjustment, per
local code.
The information contained herein is not intended to replace the full product
installation and safety information available or the experience of a trained
product installer. You are required to thoroughly read all installation
instructions and product safety information before beginning the installation
of this product.
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).
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.
Pressure – Temperature
- Temperature Range: 33°F – 180°F (0.5°C – 82°C)
- Maximum Working Pressure: 300psi (20.7 bar)
- Adjustable Reduced Pressure Range: 25–75psi (172 – 517 kPa)
- Standard Reduced Pressure Setting: 50psi (345 kPa)
Options
Add Suffix
- “ ” Threaded female union inlet x NPT female outlet
- S Solder union inlet x NPT female outlet
- QC Quick-Connect union inlet (1⁄2″, 3⁄4″, 1″)
- LF Double union body less fittings (3⁄4″, 1″, 11⁄4″)
- DU Double Union – NPT threaded union female inlet and outlet
- S-DU Double Union –Solder union inlet and outlet
- DU-PEX Double Union –PEX union inlet and outlet
- DU-QC Double Union – Quick-Connect inlet and outlet (1⁄2″, 3⁄4″, 1″)
- DU-PR Double Union – Press union inlet and outlet
- DU-CEF Double Union – PEX CEF (F1960) union inlet and outlet
- G Gauge tapping, 1⁄4″ (1⁄2″, 3⁄4″), 1⁄8″(11⁄4″-2″)
- 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) †
- Z6 Water meter threaded connections and 71⁄2″ (190mm) lay length for new or existing meter box installations, For 5⁄8″, 5⁄8″
x 3⁄4″ or 3⁄4″ meter setters or resetters
† Not available on G or GG models
Noryl® is a registered trademark of SABIC Innovative Plastics™
Dimensions — Weights
A1 – SINGLE UNION LF25AUB LESS FITTING
A2 – DOUBLE UNION LF25AUB LESS FITTINGS VALVES MAY BE ORDERED WITH 0,1,OR 2
UNION CONNECTIONS USING ANY COMBINATION OF NPT, SOLDER, PEX,QUICK CONNECT, CEF
(F1960), OR PRESS
CONNECTIONS REQUIRED
“E” DIMENSIONS ARE APPROXIMATE
ENGAGEMENT LENGTHS
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
SIZE
in
| ****
in.
| A1| ****
mm
| ****
in.
| A2| ****
mm
| ****
in.
| C| ****
mm
| ****
in.
| D| ****
mm
| ****
in.
| FΔ| ****
mm
| ****
in.
| G| ****
mm
1⁄2| 55⁄16| 135| 51⁄16| 129| 7| 178| 11⁄2| 38| 97⁄16| 240| 31⁄8| 79
3⁄4| 55⁄16| 135| 53⁄16| 132| 7| 178| 11⁄2| 38| 97⁄16| 240| 31⁄8| 79
1| 6| 152| 53⁄4| 146| 8| 203| 13⁄4| 44| 107⁄16| 265| 35⁄8| 92
11⁄4| 81⁄4| 210| 715⁄16| 202| 9| 229| 21⁄8| 54| 117⁄16| 291| 35⁄8| 92
11⁄2| 81⁄4| 210| 81⁄16| 205| 91⁄2| 241| 23⁄8| 60| 1115⁄16| 303| 41⁄16| 103
2| 87⁄8| 225| 811⁄16| 221| 111⁄4| 286| 31⁄4| 83| 13 11⁄16| 348| 43⁄4| 121
SIZE DIMENSIONS WEIGHT
in
| FNPT
in. mm
| FS
in. mm
| FPEX
in. mm
| FQC
in. mm
| FPR
in. mm
| FCEF
in. mm
| ENPT
in. mm
| ES
in. mm
| EPEX
in. mm
| EQC
in. mm
| EPR
in. mm
| ECEF
in. mm
| ****
lbs. kgs.
1⁄2| 5⁄8 16| 1⁄2 13| 5⁄8 16| 11⁄2 38| 11⁄4
32| 7⁄8 22| 1⁄2 13| 1⁄2 13| – –| 13⁄8 35|
11⁄8 29| 3⁄4 19| 3.5 1.6
3⁄4| 5⁄8 16| 3⁄4 19| 5⁄8 16| 111⁄16 43| 17⁄16 37|
11⁄8 29| 9⁄16 14| 3⁄4 19| 5⁄8 16| 19⁄16 40|
13⁄16 30| 15⁄16 24| 3.5 1.6
1| 3⁄4 19| 15⁄16 24| 13⁄16 21| 13⁄4 44| 11⁄2
38| 17⁄16 37| 11⁄16 17| 15⁄16 24| 13⁄16 21| 15⁄8
41| 13⁄16 30| 13⁄16 30| 6.5 3.0
11⁄4| 3⁄4 19| 1 25| – –| – –| 11⁄2 38| 13⁄4
44| 11⁄16 17| 1 25| – –| – –| 13⁄16 30| 11⁄2
38| 10 4.5
11⁄2| 7⁄8 22| 11⁄16 27| – –| – –| 13⁄4 44|
115⁄16 49| 11⁄16 17| 11⁄16 27| – –| – –| 13⁄8 35| 13⁄4
44| 10 4.5
2| 15⁄16 24| 15⁄16 33| – –| – –| 2 51| – –|
3⁄4 19| 15⁄16 33| – –| – –| 19⁄16 40| – –| 15
6.8
Dimension includes optional gauge
Nominal dimensions are shown. Allowances must be made for manufacturing
tolerances.
USA: T: 978-689-6066 • F:
978-975-8350 •
Watts.com
Canada: T: 888-208-8927 • F:
905-481-2316 • Watts.ca
Latin America: T: (52) 55-4122-0138 • Watts.com
References
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