Value Brand
Value Brand 3" Malleable Iron Union Class 150
A 3-inch malleable iron union rated for Class 150 service connects threaded pipes up to 300 psi at 150 °F
- Withstands 300 psi at 150 °F for reliable high-pressure service
- Handles temperatures from -20 to 366 °F across diverse applications
- Class 150 rating meets ASME B16.39 and ASTM A197 standards
- Female NPT threads enable secure connections without welding
- Malleable iron construction resists cracking under mechanical stress
3-Inch Malleable Iron Union
The Value Brand union connects two sections of 3-inch pipe with a female NPT thread on each end. It is rated Class 150 for saturated steam service up to 150 psi and cold water or oil service up to 300 psi at 150 degrees Fahrenheit. The fitting meets ASME B16.39 and ASTM A197 standards for dimensional accuracy and material quality.
Sustained Pressure And Temperature Performance
Under continuous operating pressure the malleable iron body maintains structural integrity across the full rated range of minus 20 to 366 degrees Fahrenheit. The ground joint seal resists leakage during long-term exposure to saturated steam at the 150 psi limit without requiring re-torquing. Material composition per ASTM A197 ensures consistent mechanical properties throughout extended thermal cycling.
Thermal Expansion And Installation Considerations
Malleable iron expands predictably with temperature so the union remains leak-tight from sub-zero ambient conditions up to the 366-degree maximum. The FNPT threads allow disassembly for maintenance without cutting pipe, reducing downtime on steam or hydronic lines. No special tools beyond standard pipe wrenches are required for assembly or removal.
Highlights
- Withstands 300 psi at 150 °F for reliable high-pressure service
- Handles temperatures from -20 to 366 °F across diverse applications
- Class 150 rating meets ASME B16.39 and ASTM A197 standards
- Female NPT threads enable secure connections without welding
- Malleable iron construction resists cracking under mechanical stress
Specifications
| Brand | Zoro Select |
|---|
Questions about this item
Does the 300 psi rating at 150 °F mean the union runs hot in continuous service?
The 300 psi @ 150 °F rating is a pressure limit, not a surface temperature; malleable iron conducts heat from the fluid, so insulation is needed if personnel protection is required.
What mating parts are required to install this FNPT union?
Male NPT threads on both adjoining pipes or nipples, plus thread sealant or tape compatible with the -20 °F to 366 °F range.
Will this Class 150 union mate with older ASTM A197 fittings already in the system?
Yes, it meets ASME B16.39 and ASTM A197, so it threads directly to existing Class 150 malleable iron components with matching NPT sizes.
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