Casting Ductile Iron LTD Butterfly Valve
Strictly compliant with GB/T 12238 standards, this casting ductile iron lug-type butterfly valve integrates high-strength materials with advanced sealing technology, specifically engineered for efficient isolation and flexible maintenance within piping systems. The body is precision-cast from high-grade ductile iron (QT450-10), offering superior tensile strength and toughness to effectively manage thermal expansion and mechanical vibrations. The unique lug-type configuration provides exceptional versatility, enabling dead-end service that allows for downstream pipeline maintenance while maintaining full upstream pressure, thereby maximizing operational continuity. Internally, the valve features a precision-machined stainless steel disc (such as CF8M) paired with a high-resilience interference-fit seat, creating a low-resistance flow path when open and ensuring bi-directional, bubble-tight zero-leakage shut-off when closed. The stem is designed with an anti-blowout safety feature and precision-finished to minimize operating torque, ensuring smooth manual or automated actuation. Complemented by an eco-friendly electrostatic epoxy resin coating for superior corrosion and wear resistance, this valve is the premier choice for municipal water, fire protection, HVAC, and general industrial processes where fluid purity and precise control are paramount.
| Description | Value | Unit |
| Nominal Pressure (PN) | 16 | – |
| DN | 50–400 | mm |
| Test Pressure: Shell Test Pressure | 2.4 | MPa |
| Test Pressure: Seal Test Pressure | 1.76 | MPa |
| Test Pressure: Air Test Pressure | 0.6 | MPa |
| Suitable Temp. | ≤ 120 | ℃ |
| Suitable Medium | Water, Steam, Oil (W.A.O) | – |
Structural Characteristics of
The body is cast from QT450-10 high-strength ductile iron, offering elongation and tensile strength far superior to gray iron. This allows the valve to absorb stress during pressure surges or water hammer in municipal water networks, preventing brittle fracture and ensuring the structural integrity of the pipeline.
The top-mounted multi-turn electric actuator integrates advanced control modules supporting remote PLC or DCS commands. Operators can precisely monitor the valve position from a central control room without site visits, making it perfect for unmanned pump stations or large-scale industrial process automation.
The robust wedge gate structure generates strong mechanical sealing pressure during closure. Combined with the actuator’s high torque output, the valve achieves zero-leakage shut-off even under high differential pressure, acting as a highly reliable main isolation valve for long-distance transmission pipelines.
Both internal and external surfaces are treated with electrostatic epoxy powder coating, creating a dense protective barrier. This prevents corrosion from soil or media and meets drinking water hygiene standards, avoiding secondary contamination and extending the valve’s service life in harsh buried environments.
The actuator features an independent manual handwheel and declutch lever, allowing technicians to quickly switch to manual mode during power failures or commissioning. The handwheel is easy to operate, ensuring the valve can be safely opened or closed in extreme emergencies, providing a final safety barrier for flood control systems.
Main Components Material
| NO | Part | Materials |
|---|---|---|
| 6 | Gear Box | |
| 5 | Bushing | Brass |
| 4 | Disc | QT450-10 |
| 3 | Stem | 2Cr13 |
| 2 | Seat | EPDM |
| 1 | Body | QT450-10 |
Class 150LB Main Connection Dimensions
| DN | L | K | n-M |
|---|---|---|---|
| 50 | 43 | 125 | 4-M16 |
| 65 | 46 | 145 | 4-M16 |
| 80 | 46 | 160 | 8-M16 |
| 100 | 52 | 180 | 8-M16 |
| 125 | 56 | 210 | 8-M16 |
| 150 | 56 | 240 | 8-M20 |
| 200 | 60 | 295 | 12-M20 |
| 250 | 68 | 355 | 12-M24 |
| 300 | 78 | 410 | 12-M24 |
| 350 | 78 | 470 | 16-M24 |
| 400 | 102 | 525 | 16-M27 |
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