Chainwheel Square/Rectangular Knife Gate Valve
Safe, High-Reach Isolation for Bulk Solids
The Chainwheel Square/Rectangular Knife Gate Valve is the essential manual solution for controlling bulk material flow in systems where the valve is mounted high above the floor or platform (typically above $1.7\text{m}$).
It combines the specialized Square/Rectangular Port geometry, which is perfectly suited for handling powders, granules, and lump solids from chutes and hoppers, with a Chainwheel Operator. The chainwheel allows the operator to safely and easily stroke the gate from the ground level or a safe walking surface, eliminating the need for ladders or elevated platforms for routine operation. This design ensures both operator safety and cost-effective, reliable isolation in tall bulk material handling infrastructure.
Key Features & High-Reach Advantages
| Feature Category | Technical Detail | Core Operational Benefit |
| Operation Type | Chainwheel Actuation | Allows safe, ground-level operation of valves installed high above the floor, dramatically improving operator safety and accessibility. |
| Flow Geometry | Square/Rectangular Port | Optimized for bulk solids, ensuring efficient discharge and preventing material consolidation at the chute outlet. |
| Material Handling | Non-Jamming Structure | Simple, flexible structure designed to avoid jamming, reliably handling materials up to $50\text{mm}$ in size. |
| Manual Mechanism | High-Reach Efficiency | Often used in conjunction with a Bevel Gear Operator to ensure the chain drive moves the gate smoothly with minimal effort. |
| Safety Indication | Rising Stem Design | The valve stem moves vertically, providing clear visual confirmation of the gate’s open or closed position, visible even from a distance. |
| Installation | Lightweight and Adaptable | Relatively lightweight structure, and installation is not limited by angle. |
Technical Specifications & Standard Reference
| Classification | Parameter | Standard Specification / Notes |
| Actuation | Type | Manual Chainwheel (Paired with Direct Handwheel or Bevel Gear) |
| Installation Height | Required when stem center height ($X$) is greater than $1.7\text{m}$. | |
| Design | Body Type | Square/Rectangular Port, Bonnetless Design (Standard) |
| Sealing | Metal Seated or PTFE/Polymer Seal (Optimized for dry bulk solids) | |
| Flow Type | Uni-Directional (Single-Way) or Bi-Directional (Two-Way) | |
| Connection | Type | Flanged or Lugged (Custom bolt patterns available) |
| Standard Size Range | DN $150 \times 150$ up to DN $1200 \times 1200$ (Custom Sizes Available) | |
| Materials | Body Material | Cast Iron (CI), Ductile Iron (DI), or Carbon Steel (CS) |
| Gate Material | SS304 or CS (suitable for bulk solids) | |
| Performance | Operating Pressure | Low Pressure (Typically atmospheric or minor head pressure) |
| Service Media | Powders, Grains, Ash, Pellets, Cement, Mineral Concentrates, and other bulk solids. |
Customization and Operation Guidance
- Chain Link Calculation: The required number of chain links ($M$) for operation is calculated by $M = 0.105X – 113$ ($X$ being the stem center height in mm).
- Actuator Pairing: For larger valve sizes, the chainwheel is typically attached to a Bevel Gear Operator to ensure the necessary leverage and low torque for smooth operation.
- Custom Manufacturing: This valve can be manufactured to user-specific designs and dimensions to perfectly match your hopper or chute configuration.
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