Globe valves are one of the most common types of control valves used in industrial applications. They are named for their globe-shaped body and have a movable plug or disc that regulates the flow of fluid through the valve. Here are some basics of industrial globe valves:

Construction:

• Globe valves consist of a body, bonnet, plug or disc, stem, seat, and packing.
• The body of the valve is typically made of cast iron, cast steel, stainless steel, or other materials suitable for the application.
• The plug or disc is connected to the stem, which is operated by a handwheel, pneumatic actuator, electric actuator, or hydraulic actuator.
• The seat provides a sealing surface for the plug or disc to prevent leakage when the valve is closed.
• Packing material, such as braided graphite or PTFE, is used to seal the stem and prevent leakage.

Operation:

• Globe valves operate using linear motion, where the plug or disc moves up and down to regulate the flow of fluid through the valve.
• When the valve is open, the plug or disc is lifted away from the seat, allowing fluid to flow through the valve.
• When the valve is closed, the plug or disc is pressed against the seat, blocking the flow of fluid.

Flow Characteristics:

• Globe valves are known for their excellent throttling capabilities and precise control of flow rates.
• They can provide linear, equal percentage, or quick-opening flow characteristics, depending on the design of the plug or disc and seat.

Applications:

• Globe valves are commonly used in industries such as oil and gas, petrochemical, power generation, chemical processing, water treatment, and HVAC.
• They are suitable for a wide range of applications, including throttling, isolation, regulation, and on-off control of fluids.

Advantages:

• Precise control: Globe valves offer excellent throttling capabilities and precise control of flow rates.
• Versatility: They can be used for a wide range of applications and operating conditions.
• Reliability: Globe valves are robust and reliable, making them suitable for demanding industrial environments.
• Tight shutoff: When fully closed, globe valves provide tight shutoff and prevent leakage.

Disadvantages:

• Pressure drop: Globe valves typically have a higher pressure drop compared to other types of valves, which can affect system efficiency.
• Size and weight: Globe valves are often larger and heavier than other types of valves, which may require additional support and space in the piping system.
• Maintenance: Maintenance of globe valves, particularly the packing and sealing components, may require periodic inspection and replacement.

In summary, industrial globe valves are versatile and reliable control valves used for precise control of fluid flow in various industrial applications. They offer excellent throttling capabilities, tight shutoff, and versatility, making them suitable for a wide range of process control and regulation tasks. Proper selection, installation, and maintenance of globe valves are essential to ensure optimal performance and reliability in industrial systems