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Three-inch galvanised malleable iron union with female NPT threads

Value Brand

Value Brand 3" FNPT Galvanized Union Class 150

SKU CH-Z9K5-0C9B3

Three-inch galvanized malleable iron union with FNPT threads, rated Class 150 for 300 psi water, oil or gas at 150 °F and 150 psi saturated steam

  • Galvanized malleable iron resists corrosion for durable piping
  • FNPT threaded connection enables quick assembly without welding
  • Class 150 rating supports 300 psi at 150 °F water, oil, gas
  • Meets ASME B16.39 and ASTM A197 standards for reliable performance
  • California Prop 65 warning indicates chemical hazard awareness

3-Inch Galvanized Pipe Union

This galvanized malleable iron union connects two sections of pipe with female National Pipe Thread ends. It is rated for Class 150 service and suits plumbing installations that require a separable joint. The fitting meets ASME B 16.39 and ASTM A197 standards for dimensional accuracy and material quality.

Pressure and Temperature Limits

The union withstands a maximum pressure of 300 psi at 150 degrees Fahrenheit water, oil, or gas and 150 psi for saturated steam service. These ratings define the operating envelope for hot-water heating, compressed-air lines, and low-pressure steam systems.

Sustained Load Behaviour

Under continuous pressure at the rated temperature the malleable iron body and galvanized coating maintain structural integrity without deformation. The ground-joint seal resists leakage during prolonged thermal cycling and vibration typical of industrial piping networks.

Highlights

  • Galvanized malleable iron resists corrosion for durable piping
  • FNPT threaded connection enables quick assembly without welding
  • Class 150 rating supports 300 psi at 150 °F water, oil, gas
  • Meets ASME B16.39 and ASTM A197 standards for reliable performance
  • California Prop 65 warning indicates chemical hazard awareness

Specifications

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Questions about this item

What does the Class 150 rating mean for this 3-inch union in service?

Class 150 sets the pressure boundary at 300 psi for water, oil or gas at 150 °F and 150 psi for saturated steam.

How does the FNPT connection limit the way this union seals?

FNPT threads seal by thread interference and require sealant or tape; the joint is not a flange or compression type.

What clearance is needed to install a 3-inch galvanized malleable-iron union?

The union nut must be accessible to tighten the two threaded halves together, so allow enough space for a wrench on the nut.

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