1. Flexible Sleeve or Liner: The core feature of a sleeved plug valve is the use of a flexible sleeve or liner made from materials such as rubber, PTFE (polytetrafluoroethylene), or other elastomers. This sleeve lines the inside of the valve body and forms a seal with the plug.

2. Bubble-Tight Seal: The flexible sleeve allows the plug to achieve bubble-tight sealing against the valve body seats. This ensures minimal leakage of fluids or gases through the valve, making sleeved plug valves suitable for applications requiring tight shutoff.

3. Corrosion and Wear Resistance: Depending on the material used for the sleeve or liner, sleeved plug valves can offer excellent resistance to corrosion, abrasion, and wear. This makes them suitable for handling corrosive fluids or abrasive media without compromising performance.

4. Bi-directional Flow: Sleeved plug valves are typically designed to allow bi-directional flow, meaning they can handle fluid or gas flow in both directions with equal efficiency.

5. Ease of Operation: Due to the flexible sleeve design, sleeved plug valves often have low operating torque compared to other types of valves. This reduces the effort required for opening and closing the valve, improving operational efficiency.

6. Versatility in Applications: Sleeved plug valves find applications across a wide range of industries, including chemical processing, water treatment, wastewater management, mining, pulp and paper, and pharmaceuticals. They are suitable for handling various types of fluids, including slurries, acids, bases, and abrasive media.

7. Long Service Life: The design of sleeved plug valves minimizes wear and extends service life. The flexible sleeve protects the valve body from direct contact with the process fluid, reducing the risk of corrosion and erosion over time.

8. Maintenance and Repair: Many sleeved plug valves are designed for easy maintenance and repair. The sleeve can be replaced relatively easily without removing the valve from the pipeline, reducing downtime and maintenance costs.

In summary, sleeved plug valves offer reliable sealing, corrosion resistance, bi-directional flow capability, and ease of operation. These features make them a preferred choice in industries where tight shutoff, durability, and efficient handling of challenging fluids are essential requirements.