Watts LFN250 User Manual

For Residential Applications

ES-LFN250

Job Name

Job Location

Engineer

Approval

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LEAD FREE

Contractor

Approval

Contractor’s P.O. No.

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 consumption. 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***

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Materials

Body: Iron Seat: Stainless steel Integral Strainer: Stainless steel Stem: Lead Free* brass Disc: Lead Free* brass

LFN250

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)

Dimensions — Weights

Models

LFN250 – NPT threaded female inlet x NPT female outlet LFN250B – NPT threaded female inlet x NPT female outlet

Note: Cast iron body regulators are not intended for buried or pit

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.

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.

USA: Tel. (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com Canada: Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca

with thermal expansion bypass feature

services.

size (dn) dimensions weight

A B C

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

1⁄2 15 4 102 15⁄8 41 37⁄8 98 2.5 1.1

⁄4 20 45⁄16 110 13⁄8 35 5 127 3.5 1.6

* 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).

A Watts Water Technologies Company