Extended Stem Wafer Butterfly Valve
Description
Extended Stem Wafer Butterfly Valve
Blue Epoxy Coated | Resilient Seated | ISO 5211 Mounting Pad
Product Overview
The Extended Stem Wafer Butterfly Valve is specifically engineered for applications where the actuator or manual operator must be remotely located from the pipeline. By extending the stem, this valve effectively solves critical challenges in insulated pipelines, buried installations, and extreme temperature isolation.
Featuring a durable blue epoxy resin coating and a compact wafer-type body, this valve delivers reliable bi-directional zero-leakage performance. It is the ideal solution for pipelines requiring thermal insulation, underground installation, or protection of actuators from hazardous media.
Key Features & Benefits
| Feature | Benefit |
|---|---|
| Extended Stem Design | Available in flanged or welded integral designs. Length customizable (100mm – 2000mm) to match insulation thickness or burial depth. |
| ISO 5211 Mounting Pad | Standard top flange allows direct mounting of levers, gearboxes, or pneumatic/electric actuators without complex brackets. |
| Bi-directional Zero Leakage | Precision-machined disc and resilient seat ensure bubble-tight sealing in both flow directions (ISO 5208 Rate A). |
| Blow-out Proof Stem | Safety step design prevents stem ejection under high pressure, ensuring operational safety. |
| Wafer-Type Economy | Compact, lightweight design installed between two flanges saves pipeline space and reduces installation costs. |
| Durable Exterior | Blue epoxy resin coating provides excellent corrosion resistance and a clean, professional appearance. |
Technical Specifications
| Parameter | Specification |
|---|---|
| Nominal Size | DN50 – DN1200 (2″ – 48″) |
| Pressure Rating | PN10 / PN16 / Class 150 |
| Valve Type | Concentric / Resilient Seated Butterfly Valve |
| Connection Type | Wafer Type |
| Extended Stem Type | Flanged Connection / Welded Integral |
| Extended Stem Length | 100mm – 2000mm (Customizable) |
| Design Standard | API 609 / EN 593 / MSS SP-67 |
| Face-to-Face | API 609 / ISO 5752 / EN 558 |
| Flange Compatibility | ASME B16.5 / EN 1092-2 / JIS B2220 |
| Testing Standard | API 598 / ISO 5208 |
| Operation | Lever / Gearbox / Pneumatic / Electric (via square stem) |
| Surface Finish | Blue Epoxy Resin Coating |
Materials of Construction
| Component | Material |
|---|---|
| Body | Ductile Iron (DI) / Carbon Steel (WCB) / Stainless Steel (CF8/CF8M) |
| Seat | EPDM / NBR / PTFE / Viton |
| Disc | Stainless Steel (SS304/SS316) / Nickel-Plated DI / Carbon Steel |
| Stem | Stainless Steel (SS304/SS316/SS420), Blow-out Proof |
| Extended Stem | Carbon Steel (Galvanized/Coated) / Stainless Steel (SS304/SS316) |
| Stem Sealing | O-Ring / Packing (Dust & Moisture Proof) |
| Top Flange | ISO 5211 Standard |
| Bearing/Bushing | PTFE Composite / Bronze Self-lubricating |
Performance Data
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Operating Temperature: -20°C to +120°C (EPDM); -10°C to +150°C (PTFE)
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Maximum Working Pressure: PN16 (16 bar / 232 psi)
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Leakage Class: Bi-directional Zero Leakage (ISO 5208 Rate A)
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Suitable Media: Water, wastewater, seawater, air, steam, dilute acids/alkalis, oils (depending on seat material)
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Stem Protection: Internal moisture-proof grease filling, optional external protective sleeve.
Applications
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Insulated Pipelines: Extended stem penetrates insulation for easy actuator access.
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Buried Pipelines: Valve buried underground with operating end above ground for easy maintenance.
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High/Low Temperature Pipelines: Isolates the actuator from extreme media temperatures.
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Hazardous Areas: Keeps the operating end away from toxic, corrosive, or radioactive media.
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Deep Wells or Confined Spaces: Remote operation requirements.
Why Choose This Valve?
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Customizable Stem Length: Tailored to your specific insulation thickness or installation depth.
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Reliable Sealing: Bi-directional bubble-tight shut-off ensures zero leakage.
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Versatile Actuation: Compatible with manual, pneumatic, and electric actuators via ISO 5211 top flange.
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Built for Tough Environments: Blue epoxy coating and robust construction withstand corrosive and outdoor conditions.
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Quality Assurance: Manufactured under ISO 9001 quality management system. API 598 testing standard.
Notes & Precautions
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Stem Length: Please confirm the extended stem length based on insulation thickness or burial depth. Customization is available.
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Installation: For wafer installation, ensure the valve is centered between flanges and tighten bolts evenly and symmetrically.
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Stem Maintenance: Periodically inspect the stem seal for media leakage or moisture ingress. Replenish sealing grease if necessary.
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Operating Torque: The extended stem increases operating torque. Select the appropriate operation method based on size and pressure.
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Storage: Store in a dry, ventilated area. Keep the disc slightly open and avoid direct sunlight.
Ordering Information
To request a quote or place an order, please provide:
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Size: DN50 – DN1200
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Pressure Rating: PN10 / PN16 / Class 150
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Body Material: DI / WCB / SS304 / SS316
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Seat Material: EPDM / NBR / PTFE / Viton
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Extended Stem Length: Custom required length
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Operation: Lever / Gearbox / Pneumatic / Electric
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Voltage/Control Signal (if actuated): AC 110V/220V/380V, DC 24V, 4-20mA, etc.
Contact our sales team for customized solutions.
Specifications are subject to change without notice. Please refer to the final vendor-certified drawing for exact dimensions, weight, and stem length.
Engineered for Reliability. Built for Performance.
