Nibco nhxd00h Flanged Cast Iron Swing Check Valve 4 in

Product Description

The NIBCO nhxd00h is a 4-inch flanged cast iron swing check valve rated at 175 CWP (cold working pressure). Swing check valves allow flow in one direction and close automatically when flow reverses, preventing backflow in the line. This valve is built from cast iron and uses a flanged end connection for secure, bolt-up installation. UL listing and FM approval make it suitable for fire protection and industrial piping systems where third-party certification is required. At 101 pounds, this is a full-size industrial valve intended for professional installation by licensed plumbers or pipefitters working on commercial or industrial systems.

The nhxd00h is applied in commercial and industrial piping systems where backflow prevention is required at a 4-inch line size. Its flanged configuration suits installations where the valve must be bolted directly between mating flanges on steel or cast iron piping. UL and FM ratings make it a common choice for wet-pipe fire suppression systems, industrial process lines, and heavy commercial mechanical rooms. This valve is not typically used in residential or light commercial applications given its size and weight class.

Key Features

• Swing check design closes automatically on flow reversal, providing passive backflow prevention
• 175 CWP pressure rating suitable for demanding commercial and industrial piping applications
• Flanged end connections allow direct bolt-up to standard mating flanges
• Cast iron body provides durability in heavy commercial and industrial service
• UL listed and FM approved for use in fire protection system applications

Compatibility

Designed as an OEM-style replacement or new-installation flanged swing check valve for 4-inch cast iron and steel piping systems in commercial, industrial, and fire protection applications.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable mechanical and fire protection codes. Isolate and depressurize the line before removing an existing valve or making new connections. Verify flange bolt-hole pattern and gasket compatibility with mating flanges before installation. At 101 pounds, use appropriate lifting equipment and support the valve in the line to avoid stress on adjacent piping.

Technical Specifications

• Valve Size: 4 inches
• End Connection: Flanged
• Valve Type: Swing Check
• Body Material: Cast Iron
• Pressure Rating: 175 CWP
• Certifications: UL Listed, FM Approved
• Item Weight: 101 pounds

Standard Information

• Brand: NIBCO
• Manufacturer Part Number: nhxd00h