Globe Valves

Globe valves are a type of linear motion valve used to regulate or stop the flow of fluids in a pipeline. They are commonly used in various industries, including oil and gas, petrochemical, power generation, and water treatment. Globe valves derive their name from the shape of their body, which resembles a globe.

Here are the key features and components of globe valves:

Body: The body of a globe valve is typically spherical or globular in shape, hence the name “globe” valve. It contains the internal components of the valve and provides connection points for the pipeline.
Disk or Plug: Inside the valve body, there is a movable disk or plug that regulates the flow of fluid through the valve. This disk is connected to a stem, which extends through the bonnet and is actuated by a handwheel, lever, pneumatic actuator, or electric actuator.
Seat: Globe valves have a stationary seat, usually made of metal or resilient material, against which the disk or plug seals to stop the flow of fluid when the valve is closed. The seat ensures a tight seal to prevent leakage.
Stem: The stem is the mechanism that connects the actuator to the disk or plug. When the actuator is operated, it moves the stem, which in turn raises or lowers the disk or plug to regulate the flow of fluid through the valve.
Bonnet: The bonnet is the cover or enclosure that houses the stem and other internal components of the valve. It provides protection and support for these components and is typically bolted or threaded onto the valve body.

Globe valves are characterized by their excellent throttling capability, which allows for precise control of flow rate. They can be used to regulate flow over a wide range of pressure differentials. However, compared to some other types of valves like ball valves or gate valves, globe valves tend to have higher pressure drops across the valve when fully open. This is because the flow path through a globe valve is more tortuous, leading to increased resistance to flow.

Overall, globe valves are suitable for applications where accurate flow control is required, such as in steam systems, boiler feedwater systems, cooling water systems, and process control applications.