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Pneumatic eccentric butterfly valve
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Double Eccentric(Offset) Butterfly Valve
High-Performance Pneumatic Double Offset Butterfly Valves
Engineered for Reliable Water, Wastewater, and Power Infrastructure
In demanding modern water treatment, municipal wastewater, and industrial cooling water systems, the [Brand/Series] sets the definitive industry standard for performance, longevity, and control accuracy. Specifically engineered for heavy-duty cycling, large-diameter installations, and rigorous modulating or isolation services, this high-performance pneumatic double offset system seamlessly integrates advanced valve geometry with robust pneumatic automation to deliver a low-maintenance, zero-leakage flow control solution.
1. Design Excellence: Cam-Action Double Offset Geometry
engineered Double Offset Shaft and Disc Design, which optimizes standard valve mechanics into an advanced, low-friction performance profile:
Dynamic Cam-Action Movement: Upon opening, the double offset configuration allows the disc to lift immediately and smoothly off the seat. This "cam-action" minimizes localized seat compression and friction, resulting in exceptionally low operating torque and allowing for more compact, economical pneumatic actuator sizing.
Extended Seat Longevity: When fully open, the disc is completely disengaged from the seat, eliminating the compression set and mechanical fatigue typical of conventional concentric valves.
Self-Cleaning Wiping Action: As the disc closes, it sweeps into the seat with a non-jamming, mechanical wiping effect. This inherently prevents the accumulation of suspended solids, silt, or bio-fouling on the sealing surfaces, ensuring clean, tight shut-off even in raw water or municipal sewage conditions.
2. Key Features & Customer Benefits
Bidirectional Bubble-Tight Shut-Off
Equipped with a high-resilience elastomer seat (Premium EPDM or NBR), the valve guarantees bidirectional, bubble-tight sealing compliant with API 598 standards across the entire pressure spectrum. It perfectly handles line backflow and sudden water hammer fluctuations.
High-Strength, Blowout-Proof Stem
The heavy-duty, one-piece stem design features an independent mechanical retention structure that remains securely isolated from the pneumatic actuator assembly. This ensures maximum operational safety by preventing stem blowout under extreme pressure spikes.
Self-Adjusting V-Ring Packing
The self-lubricating, V-ring PTFE packing arrangement dynamically adjusts its sealing force in response to internal line pressure. This minimizes fugitive emissions and ensures long-term external sealing with zero manual adjustment.
Heavy-Duty Protective Coating
To withstand aggressive water media, raw sewage, and seawater, the valve body and internal disc can be specified with a 300μm Fusion Bonded Epoxy (FBE) coating, providing exceptional resistance against mechanical wear, erosion, and galvanic corrosion.
3. Integrated Pneumatic Automation & Control
The top flange of the Z conforms strictly to ISO 5211 standards, enabling Direct-Mount capability with pneumatic actuators:
Direct-Mount Rigidity: Eliminates the need for external brackets or couplings. This direct interface removes mechanical backlash and hysteresis, translating into precise, immediate response for throttling and modulating applications.
Fail-Safe Configurations: * Double Acting (DA): Utilizes pneumatic power for both opening and closing cycles—efficient, rapid, and cost-effective.
Spring Return (SR): Outfitted with heavy-duty industrial springs to provide a mechanical Fail-Safe response (Fail-Closed or Fail-Open) upon loss of air or power supply, safeguarding upstream pumps and pipeline assets.
Smart Accessory Integration: Easily configured with digital electro-pneumatic positioners (4-20mA control signals), micro-switch limit boxes, solenoid valves, and air filter regulators to integrate flawlessly into your plant’s PLC or DCS network.
4. Technical Specifications
| Parameter | Industry Standards & Technical Specifications |
|---|---|
| Size Range | DN100 - DN4000 (4" to 160"+ / Large-diameter municipal customization available) |
| Pressure Ratings | PN10, PN16, PN25, PN40 / ASME Class 150, Class 300 |
| Design Standards | API 609, AWWA C504 (American Water Works Association), EN 593 |
| Face-to-Face | ISO 5752, API 609, EN 558 |
| Flange Drilling | EN 1092-1/2, ANSI/ASME B16.5 & B16.47, JIS B2220 |
| Testing & Inspection | API 598, ISO 5208 (100% Factory Bidirectional Pressure Tested) |
| Body Materials | Ductile Iron (GGG40/50), Carbon Steel (WCB), Stainless Steel (CF8/CF8M) |
| Disc Materials | SS304, SS316, Ductile Iron with Epoxy/Nylon Coating, Aluminum Bronze (for Seawater) |
| Seat Options | Resilient: EPDM (Potable/Raw Water), NBR (Oily Wastewater)
High-Perf: RTFE (High-cycle), Multi-layered Metal-to-Metal (Abrasive/High-temp) |
| Operation Type | On-Off Isolation or Precision Linear Throttling/Modulating |
| Temperature Range | -40°C to 150°C (Subject to resilient seat material limits) |
5. Typical Water Applications
Municipal & Industrial Wastewater: Aeration systems, sludge dewatering, clarifier influent/effluent isolation, and chemical feed lines.
Water Treatment & Distribution: Large-diameter raw water intake lines, gravity filter backwash systems, and pump station discharge isolation.
Power Plant Cooling Circuits: Condenser cooling water systems, main circulating water pumps, and Flue Gas Desulfurization (FGD) systems.
Desalination & Raw Intake: Special configuration with Aluminum Bronze or Duplex Stainless Steel internals designed for high-salinity and aggressive sea water environments.
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