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Pinch Valves

Pinch valves are a type of valve used to control the flow of liquids, gases, and particulate matter. The distinguishing feature of pinch valves is their simple and effective method of operation. They work by constricting or ‘pinching’ a flexible tube or sleeve within the body of the valve. The pinching mechanism can be implemented in various ways, such as through pneumatic, hydraulic, or mechanical forces, which is dependent on the specific design of the valve.

These valves are known for their aptitude in handling materials like slurries or substances that are corrosive, abrasive, or viscous in nature. Their design incorporates a full bore or port, promoting a straight-line flow with no cavities, thereby eliminating areas where deposits could accumulate. When fully opened, pinch valves become a seamless extension of the pipeline, reducing flow turbulence and head loss.

At the core of a pinch valve is its sleeve. This component can be made from a diverse array of elastomers and polymers tailored to meet the requirements of the application. Some designs incorporate a flexing sleeve that self-cleans, mitigating the build-up of scale and preventing blockages.

Ease of maintenance is another characteristic of pinch valves, thanks in part to their simplicity in design. The valve’s moving parts are isolated from the pipeline medium, and usually, the only component that may need replacement is the sleeve. This aspect contributes to their being user-friendly and relatively straightforward to service.

Finally, pinch valves come in a range of control options. They can be manufactured for basic ON/OFF functionality or designed for more precise flow control. Certain models provide nearly linear flow characteristics, making them well-suited for throttling applications.


Application features:


  • Versatility: Effective for handling a wide variety of mediums including slurries, corrosive and abrasive materials, and viscous fluids.
  • Self-cleaning: The flexing action of the sleeve during operation can eliminate inline scaling and blockages.
  • Maintenance-friendly: Simplified design with minimal mechanical parts reduces maintenance complexity.
  • Bi-directional operation: Many pinch valves are designed to operate in both flow directions and offer drop-tight shut-off across the full pressure range.
  • Flexible control options: Available in designs for simple ON/OFF operation as well as models for precise flow control.
  • Adaptability: Sleeves can be selected and replaced to suit specific service and flow specifications, extending in-line service, and lowering maintenance costs.
  • Reduced head loss and turbulence: Due to the straight-line flow design, pinch valves cause minimal disruption to the fluid flow.
  • Full port design: Offers a streamlined flow design that only marginally restricts flow when the valve is in the fully open position.
  • Compatibility with various actuators: Can be fitted with all types of actuators, including pneumatic, electric, and hydraulic.
  • Safe design: Certain designs offer additional protection in case of sleeve failure, containing the resultant release of the pipeline medium.



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Karma Instrumentation & Control is a specialist supplier of process control and automation equipment and SI systems, as well as a manufacturer and designer of process and electrical control panels.

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