Wafer Type Worm Gear Butterfly Valve
Description
Wafer Type Worm Gear Butterfly Valve – Technical Datasheet
1. Product Overview
This product is a wafer-type soft-sealed butterfly valve operated by a worm gearbox, featuring a concentric design. The body is made of ductile iron (QT450) with a blue epoxy resin electrostatic coating, and the disc is ductile iron (DI). Equipped with a worm gear operator, it provides high transmission torque, labor-saving operation, flexible opening/closing, and a self-locking function. It is ideal for large-diameter pipeline shut-off and regulation. The images illustrate sizes DN150, DN200, DN300, and DN450.
2. Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Wafer Type Worm Gear Butterfly Valve |
| Nominal Diameter (DN) | DN50 – DN1200 (Examples shown: DN150, DN200, DN300, DN450) |
| Nominal Pressure (PN) | PN10 / PN16 (Marked 5K / 10K, JIS standard) |
| Connection Type | Wafer Type |
| Operation Mode | Worm Gear (Manual Gearbox) |
| 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 (As shown in images) |
|---|---|
| Body | Ductile Iron (QT450), Blue Epoxy Resin Coated |
| Disc | Ductile Iron (DI) Nickel Plated (SS304/SS316 optional) |
| Seat | EPDM / NBR [Black rubber shown] |
| Stem | Stainless Steel (SS416 / SS304) |
| Gearbox | Cast Iron / Aluminum Alloy (Black Coated), with worm gear reduction |
| Handwheel / Input Shaft | Carbon Steel or Stainless Steel (Images show input shaft, 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 |
| 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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Worm Gear Operation & Self-Locking: The worm gearbox provides high torque and labor-saving operation. The self-locking mechanism prevents disc loosening caused by reverse flow.
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Suitable for Large Diameters: Especially suitable for fluid control in large-diameter pipelines above DN150 (e.g., DN450 shown).
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Reliable Bi-directional Sealing: Concentric soft-seat design ensures zero leakage in both directions.
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Superior Anti-Corrosion: The QT450 ductile iron body is coated with blue epoxy resin, and the DI disc is nickel-plated for excellent rust and corrosion resistance.
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Clear Markings: The body and disc are cast with clear markings (QT450, DI, DN, 5K/10K) for easy identification and selection.
