Bevel Gear Square/Rectangular Knife Gate Valve

Ergonomic Control for Large Bulk Solids Isolation

The Bevel Gear Square/Rectangular Knife Gate Valve is the robust, heavy-duty solution for manual isolation of large-diameter chutes, hoppers, and conveyors handling dry bulk materials, powders, granules, and lump solids.

This valve combines the specialized Square/Rectangular Port geometry, which perfectly integrates with bulk material handling equipment, with a Bevel Gear Operator. The gear mechanism significantly reduces the manual force (torque) required to stroke the gate, making it possible for a single operator to safely and precisely control large or high-resistance valves that would otherwise require automation or multiple operators. It is the definitive choice for reliable, large-scale manual flow regulation.

Key Features & Ergonomic Advantages

Feature Category	Technical Detail	Core Operational Benefit
Operation Type	Bevel Gear Actuation	Reduces required operating torque (turning effort), allowing safe, comfortable, and efficient manual operation of large-diameter or high-resistance valves.
Flow Geometry	Square/Rectangular Port	Optimized for bulk solids discharge, providing a smooth, uniform flow path that prevents material bridging and jamming common in round valves.
Material Handling	Non-Jamming Structure	Features flexible operation and a structure designed to avoid material consolidation, effectively handling materials up to $50\text{mm}$ in size.
Design	Heavy-Duty Manual Control	The gearbox provides better modulation and positioning control compared to direct handwheels, crucial for regulating bulk material feed rates.
Safety Indication	Rising Stem Design	The stem rises vertically through the gear operator, providing clear visual confirmation of the gate’s open or closed position.
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 Bevel Gear (Gear Ratio based on valve size)
	Options	Optional Chainwheel for overhead operation (above $1.7\text{m}$ ).
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	Typically used on sizes DN $300 \times 300$ and above
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, Granules, Ash, Cement, Mineral Concentrates, Grains, and other bulk solids.

Actuation Guidance

The Bevel Gear is the superior choice for manual operation of valves that are too large for a direct handwheel:

Standard Use: Recommended for most $300\text{mm}$ and larger square port valves to ensure low, manageable operating torque.
Overhead Installation: For large valves installed above $1.7\text{m}$ , the Bevel Gear is paired with a Chainwheel for safe, ground-level operation.

This valve can be manufactured to user-specific designs and dimensions.