Ductile Iron Double Flanged Expansion Butterfly Valve
Versatile Isolation with Built-in Pipeline Compensation for Utility and Waterworks
The Double Flanged Expansion Butterfly Valve is a specialized isolation valve that offers both flow regulation and a crucial built-in expansion joint function. Its primary benefit is the ability to compensate for thermal expansion and contraction within the pipeline and to facilitate easy installation and removal of the valve itself or other inline components, significantly simplifying maintenance and replacement procedures.
🔑 Key Features and Advantages
| Feature | Detail | Benefit in Pipeline Systems |
| Expansion Function | Built-in adjustable length compensation between the two flanges. | Thermal Compensation: Compensates for thermal stress and movement (hot/cold media) in the pipeline. Easy Maintenance: Provides necessary space for hassle-free installation, replacement, and maintenance of the valve or adjacent pipes. |
| High Body Strength | Body Material: QT450-10 Ductile Iron. | Durability: High tensile strength (≥ 450MPa) and good ductility (≥ 10% elongation) ensure a robust and reliable structure. |
| Reliable Seating | The rubber seat boasts a 50\% rubber content. | Zero Leakage: Proven in simulation tests to achieve zero leakage after over 10,000 open/close cycles, ensuring long-term sealing stability. |
| Corrosion Protection | Coated with world-renowned Akzo Nobel Epoxy Resin with a thickness of 250um. | Longevity: Excellent external corrosion resistance, ideal for buried or underground applications (Waterworks, Municipal). |
| Low Torque Design | Self-lubricating sleeve bearings are used to support the valve shaft. | Easy Operation: Minimizes friction and operating torque, reducing wear and the size of the required actuator. |
| High Protection Actuator | The worm gear operator meets IP65 Protection Rating. | Environmental Protection: Protected against dust ingress and low-pressure water jets, suitable for outdoor installation. |
| Quality Assurance | Every valve is factory pressure-tested to national standards before shipment. | Reliability: Ensures strict adherence to performance specifications. |
⚙️ Technical Specifications
| Parameter | Specification |
| Nominal Diameter (DN) | DN50 – DN1200 ( ≈2” – 48”$) |
| Nominal Pressure ($\text{PN}$) | PN10/PN16 |
| Applicable Temperature | 0°C – 80°C |
| Applicable Media | Water, Gas, Oil Products |
| Body Material | Ductile Iron (QT450-10) |
| Connection Type | Double Flanged |
🏭 Application Fields
This valve is widely applied in large-scale utility and infrastructure systems, particularly in drainage and liquid transport:
- Municipal Construction & Waterworks
- Water Treatment Plants
- Hydraulic Engineering
- Power Plants (for non-critical low-temperature systems)
- Steel and Smelting Plants
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