Manual Handwheel Square/Rectangular Knife Gate Valve
Reliable, Cost-Effective Isolation for Bulk Solids
This Square/Rectangular Knife Gate Valve (often referred to as a “Spiral Gate” or “Slide Gate”) is the essential, manually operated device for controlling the flow of dry bulk materials, powders, granules, and small lump solids in non-pressure applications.
Its Square/Rectangular Port geometry is purpose-built to integrate directly with hoppers, chutes, silos, and conveyors, preventing material buildup common with round valves. Operated by a Manual Handwheel, this valve offers a low-cost, highly reliable, and easily maintainable solution for flow regulation or absolute shut-off in metallurgy, mining, grain, cement, and chemical industries。
Key Features & Manual Control Advantages
| Feature Category | Technical Detail | Core Operational Benefit |
| Flow Geometry | Square/Rectangular Port | Optimized for bulk solids discharge, providing a smooth, uniform flow path and preventing bridging and jamming at the outlet. |
| Operation Type | Manual Handwheel Actuation | Reliable and cost-effective operation, providing fine control over material flow rate for regulation duties. Ideal for locations without power supply or where intermittent adjustment is needed. |
| Material Handling | Non-Jammed Structure | Simple, flexible structure designed to avoid jamming, effectively handling materials up to $50\text{mm}$ in size. |
| Safety Indication | Rising Stem Design | The stem rises vertically as the gate opens, offering clear visual confirmation of the gate’s position for operational safety. |
| Installation | Lightweight and Adaptable | Relatively lightweight structure with installation not limited by angle, allowing flexible placement in complex handling systems. |
| Customization | Flanged or Drill-Hole Connection | Designed to accommodate various chute and hopper outlet designs for easy system integration. |
Technical Specifications & Standard Reference
| Classification | Parameter | Standard Specification / Notes |
| Actuation | Type | Manual Handwheel (Direct Drive or Bevel Gear for large sizes) |
| Options | Optional Chainwheel for overhead installation (above $1.7\text{m}$). | |
| Design | Body Type | Square/Rectangular Port, Bonnetless Design (Standard) |
| Sealing | Metal Seated or PTFE/Polymer Seal (Optimized for dry powders/granules) | |
| 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) (Economical and Durable) |
| 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. |
Actuation Guidance
For maximum reliability and ease of use, select the appropriate manual actuation method based on installation height:
- Handwheel: Recommended for installation heights below $1.7$ meters from the floor.
- Chainwheel: Recommended for installation heights above $1.7$ meters from the floor, allowing easy operation from the ground level.
This valve can also be manufactured according to user-specific designs and dimensions.
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