Nibco F-910-B-LF-4 Flanged Silent Check Valve 4 in

Product Description

The NIBCO F-910-B-LF-4 is a 4-inch flanged silent check valve constructed of cast iron and built to a lead-free standard. Silent check valves use an internal spring-assisted disc to close smoothly before flow reversal occurs, eliminating the water hammer common with swing-type checks. This design makes it well suited for commercial and industrial piping systems where pressure surges and noise are concerns. Licensed plumbers and pipefitters typically handle installation in mechanical rooms, booster systems, and building water service lines.

The F-910-B-LF-4 is used in commercial mechanical, industrial, and building service piping applications where backflow prevention is required. Its flanged end connections suit systems assembled with standard ANSI flanges. The valve accommodates horizontal installation and vertical installation with upward flow. It is a practical choice for potable water, HVAC hydronic loops, and general fluid handling lines where a quiet, reliable check is specified.

Key Features

• Silent spring-assisted disc closes before flow reversal to prevent water hammer
• Lead-free construction meets requirements for potable water service
• Flanged end connections for bolted installation into standard ANSI flanged pipelines
• Cast iron body suited for commercial mechanical and industrial service
• Rated for horizontal or vertical (flow-up) installation
• Backed by NIBCO 5-year 125 percent limited warranty

Compatibility

Designed as an OEM-style flanged silent check valve for 4-inch commercial and industrial piping systems requiring backflow prevention with standard ANSI flange connections.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes and the International Plumbing Code. Shut off and depressurize the system fully before removing any existing valve or fitting. Verify flange bolt pattern and gasket selection match the mating pipe flanges before torquing fasteners. Confirm flow-direction arrow on the valve body is oriented correctly before completing the connection.

Technical Specifications

• Valve Type: Flanged silent check valve
• Size: 4 inches
• Body Material: Cast iron
• Lead-Free: Yes
• End Connection: Flanged
• UPC: 039923326515

Standard Information

• Brand: NIBCO
• Manufacturer Part Number: F-910-B-LF-4