NPT Galvanized Union 340 Pipe Fittings
2.Threaded union, detachable pipe connection .
3.Industrial water/gas pipeline fitting .
4.Hot-dipped galvanized, precision-threaded .
5.High-strength, anti-rust malleable iron .
6.NPT/BSPT compatible, easy disassembly .
7.Corrosion-resistant 340 pipe union .
8.Industrial-grade, removable pipe joiner
Description
NPT Galvanized Union 340 Pipe Fittings - Professional Industrial Connectors
When you need reliable pipe connections for your industrial systems, NPT Galvanized Union 340 Pipe Fittings deliver exceptional performance and durability. These specialized three-piece flexible press connectors are built to connect two channels inside strung frameworks without requiring pipe turn. Our product feature an iron-to-iron funnel shaped situate plan that makes predominant fixing capabilities for requesting applications. Whether you're working with water, oil, or gas pipeline frameworks, these fittings give the unwavering quality you require for basic mechanical operations.
At Shanxi Taigu Zhiyuan Malleable Iron Company, we've been idealizing pipe fitting fabricating for over 18 a long time. Our commitment to quality guarantees each fitting meets the most noteworthy industry guidelines whereas conveying extraordinary esteem for your projects.



Technical Specifications
Our union fittings are fabricated agreeing to ASME B16.39 guidelines for pliable press strung pipe unions. The fabric composition takes after ASTM A197 determinations, guaranteeing reliable quality and execution over all applications.
Key Technical Parameters:
- Material: High-grade malleable iron (ASTM A197)
- Tensile Strength: Minimum 300 MPa (43,500 psi)
- Elongation: 5-10% for thermal shock resistance
- Thread Standard: NPT per ASME B1.20.1
- Surface Treatment: Hot-dip galvanized (ASTM A153)
- Pressure Rating: Class 150/300 (up to 300 psi WOG)






Key Features
Superior Fixing Innovation: The 340 cone shaped situate plan makes a self-aligning, leak-proof metal-to-metal seal that progresses beneath weight. This iron-to-iron interface guarantees dependable execution in high-torque applications.
Corrosion Assurance: Hot-dip galvanization gives zinc coating thickness surpassing 86 microns. This defensive layer offers cathodic assurance against oxidation and chemical disintegration in cruel environments.
Easy Support: The three-piece plan permits speedy dismantling without cutting channels. You can effectively supplant valves, clean frameworks, or perform upkeep without disturbing whole pipeline sections.
Precision Threading: NPT strings include 60-degree points with exact 1/16 inch per inch decrease, making prevalent fixing compared to parallel strung alternatives.
Dimensions and Specifications Table
| Size (inches) | Thread Type | Overall Length (mm) | Hex Nut Size (mm) | Weight (kg) | Working Pressure (psi) |
|---|---|---|---|---|---|
| 1/8" | NPT | 35 | 19 | 0.08 | 300 |
| 1/4" | NPT | 42 | 22 | 0.12 | 300 |
| 3/8" | NPT | 48 | 27 | 0.18 | 300 |
| 1/2" | NPT | 55 | 32 | 0.25 | 300 |
| 3/4" | NPT | 65 | 41 | 0.45 | 300 |
| 1" | NPT | 75 | 50 | 0.68 | 300 |
| 1-1/4" | NPT | 85 | 60 | 1.05 | 300 |
| 1-1/2" | NPT | 95 | 70 | 1.42 | 300 |
| 2" | NPT | 115 | 85 | 2.15 | 300 |
Materials and Surface Treatment
We utilize premium flexible press that gives great ductility beneath push whereas keeping up basic astuteness. The hot-dip galvanizing prepare guarantees uniform zinc scope for most extreme erosion resistance.
The galvanized coating experiences thorough testing to confirm thickness consistency and grip quality. This treatment makes our fittings perfect for open air establishments, sticky situations, and destructive applications.






Standards and Certifications
-
ASME B16.39 - Malleable Iron Threaded Pipe Unions
- ASTM A197 - Malleable Iron Material Standards
- ASTM A153 - Hot-Dip Galvanizing Specifications
- ISO 9001 Quality Management System
- ASME B1.20.1 - NPT Threading Standards






Application Areas
Industrial Water Frameworks: Culminate for water treatment plants, cooling frameworks, and dispersion systems where dependable associations are essential.
Oil and Gas Operations: Perfect for medium-pressure applications in refineries, petrochemical plants, and pipeline systems.
HVAC Frameworks: Amazing for warming, ventilation, and discuss conditioning establishments requiring simple support access.
Manufacturing Offices: Reasonable for handle channeling, compressed discuss frameworks, and utility associations where visit dismantling may be needed.
Marine Applications: The galvanized coating gives amazing security against saltwater erosion in shipbuilding and seaward installations.
Installation Instructions
- Preparation: Guarantee pipe closes are clean and appropriately strung to NPT standards
- Assembly: Hand-tighten the union nut until cozy, at that point utilize suitable torques for last tightening
- Torque Application: Apply prescribed torque values based on fitting estimate to accomplish legitimate seal
- Testing: Perform weight testing concurring to framework necessities some time recently putting into service
Always use proper thread sealant or tape when installing NPT Galvanized Union 340 Pipe Fittings to ensure optimal sealing performance.





Quality Control
Our comprehensive quality control prepare incorporates dimensional review utilizing calibrated NPT gages, pneumatic discuss testing at 100 psi to distinguish any casting surrenders, and galvanization thickness confirmation utilizing attractive acceptance testing.
Every fitting experiences funnel shaped situate point confirmation to guarantee culminate mating surfaces for airtight fixing. We keep up strict adherence to ISO 9001 quality administration standards all through production.
OEM and Customization Services
With our 30,000-ton yearly generation capacity and over 1,000 item determinations, we offer broad customization choices. Our experienced designing group can create specialized fittings to meet your interesting requirements.
We give comprehensive OEM administrations counting custom bundling, private labeling, and altered details to suit particular applications.






Frequently Asked Questions
Q: What's the difference between 340 and 342 union fittings?
A: The 340 features an iron-to-iron conical seat, while 342 has a brass-to-iron seat design for different sealing requirements.
Q: Can these fittings handle high-temperature applications?
A: Yes, malleable iron construction allows for excellent thermal shock resistance within standard operating ranges.
Q: How do I determine the correct torque specifications?
A: Torque values depend on fitting size and application. Consult our technical team for specific recommendations.
Contact Us
Ready to enhance your piping systems with reliable NPT Galvanized Union 340 Pipe Fittings? Our technical specialists are here to help you select the perfect solution for your applications.
Email: zhiyuan@mifittings.com
Contact us today for detailed specifications, custom quotes, or technical consultation. We're committed to providing exceptional products and service for all your industrial pipe fitting needs.
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