Midland Industries 46566V Brass Check Valve 1/4 in Fpt X Mpt

Product Description

The MIDLAND INDUSTRIES 46566V is a 1/4-inch brass check valve designed to allow one-directional fluid flow while preventing backflow in plumbing and fluid-handling systems. Rated to 500 psi and 180 degrees F, this valve uses an FKM (Viton) seal for reliable performance in demanding service conditions. The FPT x MPT connection configuration allows straightforward inline installation. It has a 1 psi cracking pressure, meaning it opens under minimal upstream pressure, making it well suited for low-pressure and moderate-pressure system applications alike. Licensed plumbers and fluid-system technicians are the primary installers of this fitting.

This check valve is appropriate for residential and light commercial plumbing systems, compressed air lines, hydraulic circuits, and general fluid-handling applications where backflow prevention is required. The 1/4-18 thread size and standard FPT x MPT end connections make it compatible with typical 1/4-inch nominal pipe configurations. Its brass body construction and FKM seal make it a practical choice for water, air, oil, and many chemical service environments where compatibility with those media has been verified.

Key Features

• 500 psi maximum working pressure for use in higher-demand fluid systems
• 180 degrees F maximum temperature rating suitable for hot-water and steam-adjacent service
• FKM (Viton) seal provides resistance to oils, fuels, and a wide range of process fluids
• 1 psi cracking pressure enables response under low upstream pressure conditions
• FPT x MPT end connections allow direct inline threaded installation
• Brass body construction offers corrosion resistance and long service life in wet environments

Compatibility

Designed as an OEM-style replacement or new-installation check valve for 1/4-inch nominal threaded piping systems using standard FPT x MPT connections.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and the IPC. Shut off the upstream fluid supply and relieve system pressure completely before removing or installing any valve. Apply thread sealant or PTFE tape to male threads per standard practice, and ensure the valve is oriented correctly to match the intended flow direction marked on the body. Do not exceed the rated pressure or temperature limits during service.