Parker 4F-C4L-1-BN-B Inline Check Valve 1/4 Inch Fnpt

Product Description

The PARKER 4F-C4L-1-BN-B is a 1/4 inch inline check valve designed to allow one-directional fluid flow while preventing backflow in hydraulic, pneumatic, and fluid-handling systems. The body is machined from brass, the seal is nitrile rubber, and the spring is stainless steel. It carries a maximum working pressure rating of 3000 psi and a crack pressure of 1.00 psi. This valve is installed by licensed plumbers, pipefitters, and hydraulic system technicians in applications where backflow prevention and pressure retention are critical to system integrity.

This check valve is suited for residential and commercial fluid systems, hydraulic lines, and compressed-air plumbing where a reliable, compact inline check is required. The FNPT x FNPT end connections make it compatible with standard threaded pipe installations. Its compact size and all-metal construction make it a practical choice for tight plumbing assemblies, manifold blocks, and inline service runs where space is limited and pressure demands are high.

Key Features

• Brass body construction for corrosion resistance in fluid and pneumatic service
• Nitrile rubber seal provides reliable shutoff and chemical compatibility with common hydraulic fluids
• Stainless steel spring maintains consistent cracking performance over service life
• 3000 psi maximum working pressure for demanding hydraulic and high-pressure pneumatic applications
• 1.00 psi crack pressure allows easy opening at low differential pressure
• FNPT x FNPT connections for straightforward threaded installation without adapters

Compatibility

Designed as an OEM-style inline check valve for 1/4 inch FNPT threaded pipe systems in hydraulic, pneumatic, and general fluid-handling applications.

Installation Notes

Installation should be performed by a qualified plumber, pipefitter, or hydraulic technician following applicable IPC and system manufacturer guidelines. Depressurize and isolate the line completely before removing any existing valve or fitting. Apply thread sealant appropriate for the working fluid and rated pressure before threading the valve into the line. Verify flow direction alignment with the valve before pressurizing the system.