Parker B551BCNXXC Solenoid Valve 1/4 Inch Npt

Product Description

The PARKER B551BCNXXC is a 1/4 inch NPT solenoid valve with an all-ports-blocked unactuated state, designed for use in pneumatic and fluid control systems. The body is machined from aluminum for a lightweight, corrosion-resistant build, and the Buna-N seals provide reliable performance across a broad range of compatible media. Operating pressure ranges from 30 psi to 145 psi, making it suited for typical industrial and HVAC control applications. The Cv factor of 1.4 supports moderate flow rates through the valve. A solenoid coil is required for operation but is not included with this valve body — the coil must be ordered separately.

This valve is commonly installed in pneumatic control circuits, fluid distribution panels, and automated process systems where positive shutoff at all ports is required in the de-energized state. It is appropriate for residential and light commercial HVAC, refrigeration, and general industrial applications where 1/4 inch NPT connections are specified. Licensed HVAC technicians, industrial maintenance technicians, and plumbing contractors are the typical installers of this type of valve.

Key Features

• All-ports-blocked unactuated state ensures positive shutoff when de-energized
• 1/4 inch NPT port size for standard threaded connections
• Aluminum body construction for lightweight durability
• Buna-N seals compatible with a wide range of media
• Cv factor of 1.4 for consistent, predictable flow performance
• Solenoid coil not included — allows selection of coil voltage to match system requirements

Compatibility

Designed as an OEM-style replacement or new-installation solenoid valve for pneumatic and fluid control systems requiring a 1/4 inch NPT, all-ports-blocked configuration with an aluminum body.

Installation Notes

Installation should be performed by a qualified technician familiar with pneumatic or fluid piping systems. De-energize and depressurize the system fully before removing or installing the valve. Apply thread sealant appropriate to the media and system pressure when making NPT connections, and avoid over-tightening aluminum-bodied fittings. A compatible solenoid coil must be sourced and installed separately before the valve can be electrically actuated.