Sleeved plug valves are a type of plug valve where a flexible sleeve or liner is used to provide sealing between the plug and the valve body.

Design and Construction:

• Sleeved plug valves consist of a cylindrical or tapered plug with a through-hole (port) that is rotated within the valve body to control the flow of fluid.
• The plug is surrounded by a flexible sleeve or liner made of materials such as rubber, PTFE (polytetrafluoroethylene), or elastomers.
• The sleeve provides a tight seal between the plug and the valve body, preventing leakage when the valve is closed.

Materials of Construction:

• The materials used for the plug and the sleeve in sleeved plug valves vary depending on the application requirements.
• The plug may be made of materials such as carbon steel, stainless steel, or other alloys, while the sleeve is typically made of rubber, PTFE, or elastomers.
• The choice of material depends on factors such as the fluid being handled, temperature, pressure, corrosion resistance requirements, and compatibility with other system components.

Advantages:

• Excellent sealing performance, even in high-pressure or high-temperature conditions
• Minimal maintenance requirements due to the replaceable sleeve design
• Suitable for handling abrasive or corrosive fluids
• Quick and easy operation with a quarter-turn motion

A lubricated plug valve is a type of plug valve that uses a lubricant to reduce friction between the plug and the valve body, ensuring smooth operation and tight sealing.

Design and Construction:

• Lubricated plug valves consist of a cylindrical or tapered plug with a through-hole (port) that is rotated within the valve body to control the flow of fluid.
• The plug is coated with a lubricant, such as grease or oil, to reduce friction and wear during operation.
• The valve body typically has a tapered or cylindrical cavity that accommodates the plug and provides a sealing surface.

Materials of Construction:

• Lubricated plug valves are available in various materials to suit different application requirements, including carbon steel, stainless steel, cast iron, ductile iron, and other alloys.
• The choice of material depends on factors such as the fluid being handled, temperature, pressure, corrosion resistance requirements, and compatibility with the lubricant.

Advantages:

• Reduced friction and wear, resulting in smoother operation and extended service life
• Tight sealing even under high-pressure or high-temperature conditions
• Suitable for handling a wide range of fluids, including liquids, gases, and slurries
• Quick and easy operation with a quarter-turn motion
• Lower torque requirements compared to some other types of valves

A pressure balance lubricated plug valve is a specialized type of plug valve designed to minimize the effects of pressure imbalances across the valve, particularly during opening and closing operations

Design and Construction:

• Pressure balance lubricated plug valves feature a cylindrical or tapered plug with a through-hole (port) that is rotated within the valve body to control the flow of fluid.
• The plug is coated with a lubricant to reduce friction between the plug and the valve body.
• Additionally, these valves include pressure balancing features to equalize the pressure acting on both sides of the plug, particularly during high-pressure differentials.

Materials of Construction:

• Pressure balance lubricated plug valves are available in various materials to suit different application requirements, including carbon steel, stainless steel, cast iron, ductile iron, and other alloys.
• The choice of material depends on factors such as the fluid being handled, temperature, pressure, corrosion resistance requirements, and compatibility with the lubricant.

Advantages:

• Minimized risk of plug jamming and sticking, even under high-pressure conditions
• Smooth operation and reliable sealing performance
• Suitable for handling a wide range of fluids and operating conditions
• Quick and easy operation with a quarter-turn motion
• Extended service life due to the use of lubrication and pressure balancing features