Norgren 4LD-051-D00 Inline Barb Check Valve Polypropylene

Product Description

The NORGREN 4LD-051-D00 is an inline barb check valve designed to allow one-directional fluid or gas flow while preventing backflow in a line. The body is constructed from polypropylene, making it resistant to a wide range of fluids encountered in pneumatic and fluid handling systems. It connects via barb fittings sized for tubing with a 1/16-inch inside diameter and an 8.60 mm outside diameter. The valve has a crack pressure of 8.00 psi, meaning flow begins once upstream pressure reaches that threshold. It is commonly installed by HVAC technicians, plumbers, and industrial maintenance professionals working on low-pressure fluid or air circuits.

This check valve is suited for inline installation in low-pressure pneumatic lines, condensate drain systems, fluid transfer lines, and similar light-duty applications found in both residential and light commercial settings. The barb connection style allows direct insertion into compatible flexible tubing without additional fittings, simplifying installation in tight or confined spaces where a compact, lightweight valve is required.

Key Features

• Inline flow design prevents backflow and protects upstream components
• Polypropylene body offers broad chemical resistance for fluid and pneumatic service
• Barb connection fits tubing with 1/16-inch inside diameter
• 8.00 psi crack pressure provides a defined, low-pressure actuation point
• Compact and lightweight at 0.5 pounds for easy inline integration

Compatibility

Designed as an OEM-style replacement or direct-fit inline check valve for low-pressure pneumatic and fluid handling systems using barb-connected flexible tubing with a 1/16-inch inside diameter.

Installation Notes

Installation is typically performed by HVAC technicians, plumbers, or industrial maintenance technicians. Depressurize and isolate the line completely before removing any existing valve or inserting this check valve. Ensure the flow-direction arrow or marking on the valve body is oriented correctly in the line before securing the barb connections. Verify that tubing inside diameter matches the barb size to maintain a leak-free seal under operating pressure.