Wafer Type Extended Stem Worm Gear Butterfly Valve
Description
Wafer Type Extended Stem Worm Gear Butterfly Valve (3.2m Stem) – Technical Datasheet
1. Product Overview
This product is a wafer-type soft-sealed butterfly valve featuring a 3.2-meter extended stem and a concentric design. The body is made of ductile iron (QT450) with a blue epoxy resin electrostatic coating. Its key feature is the 3.2-meter ultra-long extended stem, connected to a worm gear operator at the top. It is specifically designed for deeply buried pipelines, deep wells, or remote operation conditions, allowing operators to easily control the valve from the surface without the need for excavation or access platforms.
2. Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Wafer Type Extended Stem Worm Gear Butterfly Valve |
| Nominal Diameter (DN) | DN50 – DN1200 (Customizable upon request) |
| Nominal Pressure (PN) | PN10 / PN16 / 5K / 10K |
| Connection Type | Wafer Type (Multi-Flange Drilled / Universal Drilling optional) |
| Operation Mode | Worm Gear (Manual Gearbox) |
| Extended Stem Length | 3.2 Meters (Custom lengths available upon request) |
| Extended Stem Material | Carbon Steel / Stainless Steel, Blue Epoxy Resin Coated |
| Applicable Temperature | -20°C ~ 120°C (Depends on seat material) |
| Applicable Medium | Water, sewage, sea water, air, oil, weak acids & alkalis |
| Leakage Class | Zero Leakage (Complies with GB/T 13927 / ISO 5208 Grade A) |
3. Material of Main Parts
| Part Name | Material Specification |
|---|---|
| Body | Ductile Iron (QT450), Blue Epoxy Resin Coated |
| Disc | Ductile Iron (DI) Nickel Plated (SS304/SS316 optional) |
| Seat | EPDM / NBR [Black rubber shown] |
| Main Stem | Stainless Steel (SS416 / SS304) |
| Extended Stem | 3.2m Carbon Steel / Stainless Steel Seamless Pipe, Flanged Connection |
| Gearbox | Cast Iron / Aluminum Alloy (Black Coated), with self-locking function |
| Handwheel / Input Shaft | Carbon Steel or Stainless Steel (Normally equipped with handwheel) |
4. Applicable Standards
| Standard Type | Reference Standard |
|---|---|
| Design & Manufacture | API 609 / EN 593 / JIS B2032 / GB/T 12238 |
| Flange Connection | ANSI B16.5 / DIN 2501 / JIS B2212 / GB/T 17241.6 (Multi-standard optional) |
| Face to Face | API 609 / EN 558-1 / ISO 5752 / GB/T 12221 |
| Pressure Test | API 598 / EN 12266 / GB/T 13927 |
5. Key Features
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3.2-Meter Extended Stem: This specific configuration features a 3.2-meter long stem, purpose-built for deeply buried pipelines or hard-to-reach areas. It brings the operation point directly to the surface, greatly reducing maintenance time and cost.
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Worm Gear Operation & Self-Locking: The worm gearbox at the top of the extended stem provides high torque and labor-saving operation. The self-locking mechanism prevents disc loosening caused by reverse flow.
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Reliable Bi-directional Sealing: The concentric soft-seat structure ensures a tight fit between the rubber seat and the DI disc, achieving zero leakage in both directions.
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Superior Anti-Corrosion: Both the body and the 3.2-meter extended stem undergo blue epoxy resin electrostatic coating, adapting well to humid or harsh underground environments.
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Multi-Standard Compatibility: Multi-flange drilling (Universal Drilling) can be provided upon request, adapting to ANSI, DIN, JIS, and other international flange standards.
