300LB Black Malleable Iron 90 Degree Elbow Pipe Fitting
2.High Pressure Resistant for Fire & Plumbing Pipeline .
3.Dual NPT/BSPT Thread, Tight Sealing Without Leakage .
4.High Strength EG No Hub Reducing Pipe Coupling .
5.Black Anti-rust Coating, Stable Performance Long Lifespan .
6.Class 300 Standard Malleable Iron Elbow for Fire, Gas & Hydraulic Pipeline .
7.Heavy Duty Pressure-resistant Wear-proof Malleable Iron Pipe Elbow .
8.Universal NPT/BSPT Thread Malleable Iron 90° Elbow Pipe Connector
Description
Class 300 Black Malleable Iron 90 Degree Elbow Pipe Fitting
When you need to change pipeline direction and connect two female threaded pipes, our Class 300 Black Malleable Iron 90° Elbow is your ideal plumbing solution. This standard elbow features double female threads on both ends, realizing smooth pipeline steering without extra adapters. Made of high-quality malleable cast iron, it boasts stable mechanical performance and excellent pressure resistance fully compliant with Class 300 standard. The black oxide anti-rust coating forms a protective layer to slow oxidation and extend long service life. Precise NPT & BSPT dual standard threads ensure tight, leak-free connection for fire protection, natural gas, water and industrial fluid piping systems.
Shanxi Taigu Zhiyuan Malleable Iron Co., Limited has specialized in malleable iron pipe fitting manufacturing for more than 26 years. Every fitting undergoes strict dimensional, hydraulic pressure and surface inspection, delivering reliable, standard-compliant pipe fittings for global plumbing, fire and gas engineering projects.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | 90° Elbow (Double Female Thread) |
| Pressure Class | Class 300 (300#) |
| Raw Material | Malleable Iron |
| Surface Finish | Black Oxide / Black Raw Finish |
| Thread Standard | NPT American Standard & BSPT British Standard Thread |
| Working Temperature | -20℃ ~ 120℃ |
| Applicable Medium | Water, Gas, Compressed Air, Light Industrial Fluid |
| Certification | Compliant with ANSI B16.3 |
| Application Scenario | Plumbing, Fire Protection, Gas Pipeline, Industrial Piping |
Key Features
1.Excellent Corrosion Resistance The black oxide surface layer effectively blocks oxidation. It delivers stable anti-rust performance for long-term use in water, gas and indoor concealed piping systems.
2.Precise Thread Sealing Standard NPT & BSPT double female threads are machined with high precision, enabling tight leak-free connection without extra sealant in most scenarios.
3.Easy & Quick Installation Double female thread design realizes 90° pipe turning directly, no extra adapters required; compatible with common pipe wrenches for fast assembly.
4.Stable Structural Strength Made of high-quality malleable iron, the fitting boasts outstanding mechanical toughness and impact resistance, rated for Class 300 working pressure.
5.Wide Compatibility & Cost-Efficient Suitable for plumbing, fire protection, gas and light industrial pipelines; provides reliable performance at a competitive cost vs premium alloy alternatives.
Dimensions and Specifications
Our 90° elbows support a full range of standard inch sizes, mainstream options include:
- 1/8", 1/4", 3/8", 1/2", 3/4", 1"
- 1-1/4", 1-1/2", 2"
- Custom size requests are acceptable
Every elbow is manufactured with precise dimensional tolerance. Solid one-piece casting structure greatly prevents deformation or loosening under normal working pressure.
Materials and Surface Treatments
1..Main Body Raw Material High-quality malleable iron (ANSI B16.3 compliant) features high toughness, strong impact resistance and stable mechanical performance under Class 300 pressure rating.
2.Surface Finish Black oxide raw finish forms a natural protective film on the fitting surface, effectively slowing oxidation and rust formation for long-term indoor pipeline use.
3.Thread Processing Precision CNC machined NPT & BSPT double female threads ensure tight, leakproof fit when connecting standard threaded pipes.
Standards and Certifications
Our products comply with rigorous international industry standards:
- Compliant with ANSI B16.3 (Malleable Iron Threaded Pipe Fittings)
- ISO9001 quality management system certified
All 90° elbows are fully tested for pressure resistance, thread precision and sealing performance prior to packaging.
Applications
1.Residential & Commercial Plumbing For domestic cold/hot water pipelines, commercial restroom and kitchen pipe turning connections.
2.Gas Pipeline Systems Ideal for natural gas and LPG pipeline direction transition, with tight NPT & BSPT dual standard thread sealing.
3.Fire Protection Piping Suitable for small-bore fire sprinkler branch pipe 90° turning joints.
4.Light Industrial Fluid Delivery Used for compressed air, low-pressure liquid industrial pipeline routing conversion.
Installation Instructions
- Thread Preparation: Clean male and female threads of pipe and fitting, apply PTFE tape evenly if needed.
- Hand Screw Alignment: Rotate the 90° elbow by hand to align threads without forced twisting.
- Tool Tightening: Use two pipe wrenches to secure both sides evenly, avoid over-tightening to prevent thread damage.
- Leak Test: Complete pressure test after installation to confirm zero leakage at the joint.
- Post-Check: Inspect connection regularly for long-term stable sealing.
Follow local plumbing, gas and fire safety codes during all installation work.
Packaging and Shipping
Each malleable iron elbow is wrapped with anti-collision protective packaging to avoid scratches and abrasion during shipment. Moisture-resistant packaging materials are used to keep the black oxide finish intact. Large bulk shipments are loaded on standard pallets for convenient handling and container loading.
Based in Taigu, Shanxi, we have mature, efficient logistics channels covering worldwide ports and markets, enabling fast, cost-effective delivery for all bulk orders.
Quality Control
1.Raw Material Inspection Every batch of malleable iron raw material is inspected for chemical composition and mechanical toughness.
2.Pressure Burst Test Random samples are subjected to hydrostatic pressure testing matching Class 300 working pressure rating.
3.NPT & BSPT Thread Precision Check CNC thread gauges inspect thread accuracy to guarantee tight leak-free connection.
4.Surface Anti-Rust Inspection Black oxide surface finish is fully checked to avoid oxidation defects and surface flaws.
OEM and Customization Services
With an annual production capacity of 30,000 tons, we support bulk OEM & customized orders. Our R&D team can customize sizes, logos and packaging to satisfy unique project demands. We store over 1,000 sets of malleable iron fitting molds for fast customization and short lead times.
FAQ
Q: Can this malleable iron elbow be buried underground?
A: We do not recommend direct underground burial; for underground use, please select specialized anti-corrosion coated fittings.
Q: What is the correct installation method for this 90° elbow?
A: Wrap PTFE tape evenly on NPT & BSPT threads, tighten with two pipe wrenches symmetrically; do not over-torque to avoid thread damage.
Q: Can it cope with pipeline thermal expansion?
A: As rigid threaded fitting, we suggest installing expansion joints for long pipelines with obvious temperature variation.
Q: Can it connect different material pipes like PVC and steel?
A: It can connect standard NPT & BSPT threaded pipes of different materials, ensure thread specification matches before assembly.
Q: Why choose black malleable iron instead of stainless steel?
A: It features high mechanical toughness, stable pressure resistance up to Class 300, and offers great cost performance for plumbing, gas and light industrial piping.
Contact Us
Want to pick the suitable Class 300 Black Malleable Iron 90° Elbow for your project? Our technical team will offer professional one-stop selection support.
Email: q1236800000@gmail.com Get technical specs, bulk price and delivery timeline by contacting us. We always provide premium malleable iron pipe fittings for global pipeline projects.
Online Message