Critical Technical Advantages
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Equal Percentage Characteristic: Unlike conventional butterfly valves that have a linear or quick-opening profile, the Control-Disk features a patented disk shape that mimics the equal percentage curve of a segmented ball valve. This provides a much wider control range and superior throttling precision.
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Bi-Directional Support System: A unique spring in the outboard shaft provides constant support to the drive train and disk. This allows the valve to be installed in either horizontal or vertical orientations without affecting performance or reducing cycle life.
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Minimized Lost Motion: The valve utilizes a splined shaft with a clamped lever and single-pivot linkage. This design significantly reduces backlash and lost motion between the actuator and the valve shaft, ensuring that the control signal translates accurately into disk movement.
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Pressure-Assisted Sealing: Both the soft and metal seal rings utilize process pressure to enhance the sealing action. This ensures tight shutoff integrity across a wide range of pressure drops, enhancing safety and process efficiency.
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Durable Disk-to-Shaft Connection: The improved expansion pin system provides a positive, high-strength connection between the disk and shaft. This eliminates the slop and wear common in pinned designs, optimizing long-term control accuracy and simplifying disassembly for maintenance.
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Severe Service Options: To handle challenging environments, the Control-Disk is available with trim and bolting materials compliant with NACE standards for sour liquids and gases.
Technical Performance Matrix
| Feature | Details |
| Valve Style | Rotary Disk (Butterfly-style) |
| Flow Characteristic | Equal Percentage |
| Shaft Design | Splined with Outboard Support Spring |
| Shutoff Capability | Pressure-assisted Soft or Metal Seals |
| Orientation | Horizontal or Vertical Mounting |
| Coating | Corrosion-resistant Powder Paint |
Primary Applications
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Chemical Throttling: Precise control of additives and reactants where process variability must be minimized.
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Refining Processes: Handling hydrocarbons and sour gases requiring NACE-compliant materials.
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Pulp and Paper: Managing steam and water flows where a wide range of control is necessary.
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HVAC and Utilities: Efficient throttling for large-scale water and temperature control systems.
