Watts LFN250 - Manual

size (dn) dimensions weight
A B C
in. mm in. mm in. mm in. mm lbs. kgs.
1 ⁄
2
15 4 102 1 5 ⁄
8
41 3 7 ⁄
8
98 2.5 1.1
3 ⁄
4
20 4 5 ⁄
16
110 1 3 ⁄
8
35 5 127 3.5 1.6
For Residential Applications
ES-LFN250
Job Name –––––––––––––––––––––––––––––––––––––––––––– Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location –––––––––––––––––––––––––––––––––––––––––– Approval ––––––––––––––––––––––––––––––––––––––––––––––
Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. –––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative
–––––––––––––––––––––––––––––––––––––––––
Series LFN250
Iron Body Water Pressure
Reducing Valves**
Sizes: 1 ⁄
2
" – 3 ⁄
4
" (15 – 20mm)
Series LFN250 Iron Body Water Pressure Reducing Valves are
designed to reduce incoming water pressure to a sensible level to
protect plumbing system components and reduce water consump-
tion. This series is suitable for water supply pressures up
to 250psi (17.2 bar) and may be adjusted from 25 – 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 optional 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. The LFN250 features Lead Free* construction to comply
with Lead Free* installation requirements.
Features
• Integral strainer
• Unitized construction for ease of maintenance
• High temperature resisting diaphragm for hot or cold water
• All working parts easily and quickly serviceable without
removing the valve from the line
• Optional bypass feature controls thermal expansion pressure***
Models
LFN250 – NPT threaded female inlet x NPT female outlet
LFN250B – NPT threaded female inlet x NPT female outlet
with thermal expansion bypass feature
Note: Cast iron body regulators are not intended for buried or pit
services.
Specifications
A Water Pressure Reducing Valve and strainer shall be installed on
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. 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. Pressure reducing valves with built-in bypass check
valves and integral strainer will be acceptable. Valve shall be a Watts
Series LFN250.
Materials
Body: Iron
Seat: Stainless steel
Integral Strainer: Stainless steel
Stem: Lead Free* brass
Disc: Lead Free* brass
Pressure — Temperature
Temperature Range: 33°F – 160°F (0.5°C – 71°C)
Maximum Working Pressure: 250psi (17.2 bar)
Adjustable Reduced Pressure Range: 25 – 75psi (172 – 517 kPa)
Standard Reduced Pressure Setting: 50psi (345 kPa)
* 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 pres-
sure 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).
LFN250
Dimensions — Weights
A
B
C
ES-LFN250 1315 © 2013 Watts
USA: Tel. (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca
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.
A Watts Water Technologies Company
LEAD FREE
*