Watts Lfn55bm1-du-s 1 Inches Pressure Reducing Valve 1 in

Product Description

The WATTS lfn55bm1-du-s 1" is a 1-inch water pressure reducing valve (PRV) designed to lower incoming supply pressure to a safe, controllable range for both residential and commercial plumbing systems. Built with a lead free copper silicon alloy body and a bronze sealed spring cage, it is suited for accessible outdoor waterworks or pit installations where corrosion resistance and durability are required. The valve adjusts outlet pressure from 25 to 75 psi, with a factory standard setting of 50 psi, and can handle incoming supply pressure up to 400 psi. An integral stainless steel strainer and thermal expansion bypass are built in, reducing the need for additional inline components.

This PRV fits into commercial and residential cold and hot water supply lines where incoming municipal or well pressure exceeds safe operating limits for downstream fixtures, appliances, and plumbing components. The solder union inlet and outlet connections make it appropriate for copper pipe systems. Its operating temperature range of 33 to 180 degrees F makes it suitable for both cold water service and domestic hot water applications. Licensed plumbers install this valve as part of new construction, remodel, or system upgrade projects requiring pressure management and water conservation compliance.

Key Features

• Lead free copper silicon alloy body meets lead free installation requirements for potable water systems
• Adjustable pressure range of 25 to 75 psi with a standard factory setting of 50 psi
• Rated for maximum working pressure of 400 psi on the inlet side
• Integral stainless steel strainer protects the valve seat from debris without a separate inline filter
• Thermal expansion bypass built in to handle pressure fluctuations caused by water heater expansion
• Bronze sealed spring cage designed for pit or outdoor waterworks installations
• Solder union inlet and outlet connections for copper pipe integration

Compatibility

Designed as an OEM-style replacement or new-installation PRV for 1-inch copper pipe residential and commercial plumbing systems requiring pressure reduction on potable water supply lines.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the International Plumbing Code (IPC). Shut off the main water supply and relieve system pressure completely before removing any existing valve or making new connections. The solder union connections require standard copper soldering tools and flux rated for potable water service. After installation, adjust outlet pressure with the system charged and verify the setting with a calibrated pressure gauge downstream of the valve.

Technical Specifications

• Inlet Connection Size: 1 inch
• Outlet Connection Size: 1 inch
• Inlet Connection Type: Union Joint (Solder)
• Outlet Connection Type: Union Joint (Solder)
• Adjustable Reduced Pressure Range: 25 to 75 psi
• Standard Reduced Pressure Setting: 50 psi
• Maximum Working Pressure: 400 psi
• Temperature Range: 33 to 180 degrees F
• Body Material: Lead Free Copper Silicon Alloy
• Disc Material: Reinforced EPDM
• Strainer Material: Stainless Steel
• Trim Material: Bronze
• Integral Strainer: Yes
• Thermal Expansion Bypass: Yes
• Lead Free: Yes
• Series: LFN55B-M1

Standard Information

• Brand: WATTS
• Manufacturer Part Number: lfn55bm1-du-s 1"