Nibco NHAL10H Gate Valve 4 Inch Flanged Ductile Iron 150 Class

Product Description

The NIBCO NHAL10H is a 4-inch outside stem and yoke (OS and Y) gate valve built for industrial and commercial piping systems. The valve features a ductile iron body with a bolted bonnet and solid wedge disc, offering a straightforward full-bore shutoff in on-off service. The flanged raised-face end connection is rated to ASME Class 150, making it compatible with standard flat-face and raised-face flanged systems. Licensed plumbers, pipefitters, and mechanical contractors typically install this valve in commercial HVAC, fire protection, and process piping applications where visible stem position confirms open or closed status.

This valve is suited for 4-inch flanged piping systems in commercial and light industrial environments. The OS and Y design is required by many fire-protection and mechanical codes because the raised stem provides a visual indicator of valve position without disassembly. It is commonly installed in building mechanical rooms, cooling tower supply and return lines, and industrial process lines operating within Class 150 pressure ratings. The bolted bonnet allows for field inspection and repacking of the stem without removing the valve from the line.

Key Features

• Outside stem and yoke (OS and Y) design provides visible open and closed indication at the stem
• Ductile iron body offers higher impact resistance and tensile strength compared to standard cast iron
• Solid wedge disc delivers reliable bidirectional shutoff and positive seating
• Bolted bonnet design allows field repacking without line removal
• Flanged raised-face ends meet standard ASME Class 150 bolt patterns for direct flange-to-flange installation
• Full-bore flow path minimizes pressure drop in fully open position

Compatibility

Designed as an OEM-style replacement or new-installation gate valve for 4-inch flanged piping systems rated to ASME Class 150 in commercial and industrial mechanical applications.

Installation Notes

Installation should be performed by a licensed pipefitter or plumber in accordance with applicable mechanical codes such as the IPC or ASME B31.1. Isolate and depressurize the line and drain residual fluid before removing any flanged connection. Verify flange bolt pattern and gasket type match the raised-face configuration before torquing fasteners. Do not use this valve for throttling service; it is rated for full-open or full-closed operation only.