Name: China Customized Double Flanged Duckfoot Bend Manufacturers, Suppliers, Factory - Keylion
Brand: Keylion
SKU: 314534831

Double Flanged Duckfoot Bend

Product Introduction:

Integrated Support Base for Vertical Loading: The primary job of this Double Flanged Duckfoot Bend is to handle the massive downward pressure of a vertical pipe stack. The molded "foot" bracket sits flat on concrete foundations or thrust blocks to anchor the pipeline, effectively bearing both the physical weight of the water column and the hydraulic thrust generated at the 90-degree turn.
Vibration Dampening & Foundation Anchoring: Unlike standard elbows that hang in mid-air, this flanged base bend is designed to be bolted down. By securing the duckfoot to a solid plinth, you significantly reduce the vibration and "pipe walk" caused by high-velocity water flow or sudden pump start-ups, which protects your flange gaskets from premature failure.
Precision Face-to-Face Dimensions: We follow the geometry specified in ISO 2531 and EN 545 strictly. This means the height of the vertical leg and the length of the horizontal run are standardized, ensuring that when you drop this supported elbow into an existing pump station layout, it aligns perfectly with your valves and headers without needing forced bolting or expensive pipeline adjustments.
Specific Riser Pipe Stability: This duckfoot bend acts as the structural foundation for riser pipes in high-rise buildings and deep pumping pits. It prevents the vertical section from sagging or shifting, which is a common cause of joint leaks in large-scale water distribution networks where standard pipe hangers aren't enough to carry the full weight.

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Description

Technical Parameters

Double Flanged Duckfoot Bend

Keylion® Double Flanged Duckfoot Bend, often referred to in the industry as a flanged base bend or 90-degree support elbow, is a critical component for stable pipeline architecture. When a vertical pipeline needs to transition to a horizontal run, the weight at that 90-degree turn is immense. This fitting provides the necessary structural support to keep the line from sagging or shifting. It is widely installed at the bottom of riser pipes in high-rise buildings, wastewater treatment plants, and irrigation pump stations. The duckfoot design ensures that the gravitational load is distributed evenly, protecting the integrity of the entire flanged connection system.

Technical Parameter

Product Name	Double Flanged Duckfoot Bend
Brand	Keylion®
Nominal Diameter	DN50-DN1200(Common sizes: DN80, DN100, DN150, DN200)
Nominal Pressure	PN10/PN16/PN25
Material	Ductile Iron
Manufacturing Standard	ISO 2531, EN 545 (for potable water), EN 598 (for sewage)
Flange Drilling	EN 1092-2, ISO 7005-2, BS 4504, or ANSI/ASME B16.1
Angle	90°
Surface Coating	Internal & External: Fusion Bonded Epoxy (FBE) Coating
Coating Color	Blue/Black
Applicable Medium	Potable water, raw water, sewage, neutral liquids, fire protection systems
Working Temperature	0°C to +70°C

FAQ

Q: What is the main purpose of the "duckfoot" on this bend?

A: The duckfoot provides a solid base to transfer the weight of the vertical water column and the pipe stack to the ground. It acts as a structural anchor, preventing the 90-degree joint from sagging or cracking under hydraulic thrust and gravitational load during high-pressure system operation.

Q: Can this duckfoot bend be used without a concrete foundation?

A: We don't recommend it. Without a concrete plinth or thrust block, the duckfoot cannot distribute the load evenly. The fitting might sink into the soil or shift, leading to flange misalignment and leaks. For high-pressure lines, a solid concrete foundation is absolutely mandatory for long-term safety.

Q: What type of gaskets and bolts are recommended for installation?

A: Use EPDM or NBR full-face gaskets to ensure a tight seal across the flange surface. For hardware, hot-dip galvanized or stainless steel bolts are best to prevent corrosion. Ensure bolts are tightened in a criss-cross pattern to distribute pressure evenly and avoid crushing the gasket unevenly.

Q: Can this fitting be used for sewage or wastewater lines?

A: Yes, it works great for sewage. The ductile iron body and Fusion Bonded Epoxy coating handle raw wastewater well. However, for highly acidic industrial waste, you might need a special internal lining. For standard municipal sewage riser pipes, this fitting is a reliable, industry-standard choice for contractors.

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