Nibco nln50xk Silent Wafer Check Valve 6 in 250 Cwp

Product Description

The NIBCO nln50xk is a 6-inch lead-free cast iron dual disc silent wafer check valve designed to prevent backflow in piping systems. Rated at 250 CWP (cold working pressure) and classified under Class 125, this valve uses a Buna-N seat to provide a reliable, low-maintenance seal. The dual disc silent design minimizes water hammer by closing before flow reversal, making it well suited for commercial and industrial water service applications. Installation is handled by licensed plumbers and pipefitters working on pressurized fluid systems.

This valve fits between standard pipe flanges in a wafer-style configuration, requiring no additional valve body flanges for mounting. The 6-inch size and cast iron body make it appropriate for larger-diameter water distribution, HVAC hydronic systems, and similar fluid handling applications where backflow prevention is required. Its lead-free construction meets applicable requirements for potable water service.

Key Features

• Dual disc silent check design minimizes water hammer on flow reversal
• Lead-free cast iron body meets potable water compliance requirements
• Buna-N seat provides a durable, resilient sealing surface
• Class 125 rated at 250 CWP for pressurized commercial and industrial service
• Wafer-style body installs between flanges without additional end connections

Compatibility

Designed as an OEM-style replacement or new-installation wafer check valve for 6-inch flanged piping systems in commercial plumbing, HVAC hydronic, and industrial water service applications.

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 completely before removing any existing valve or inserting this check valve between flanges. Verify flange bolt pattern and gasket compatibility before torquing hardware. Confirm flow direction arrow on the valve body aligns with the intended flow path prior to final assembly.

Technical Specifications

• Size: 6 inches
• Material: Cast Iron
• Seat Material: Buna-N
• Cold Working Pressure (CWP): 250 psi
• Pressure Class: Class 125
• Lead Free: Yes
• Valve Type: Wafer

Standard Information

• Brand: NIBCO
• Manufacturer Part Number: nln50xk