Watts LFN250 User Manual

	ES-LFN250
For Residential Applications
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LEAD FREE*

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***

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	LFN250
	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)

Dimensions — Weights

C

B

A

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

3⁄4

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 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.

USA: Tel. [phone] • Fax: [phone] • www.watts.com

A Watts Water Technologies Company

Canada: Tel. [phone] • Fax: [phone] • www.watts.ca

ES-LFN250 1315

© 2013 Watts