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Globe valves are a type of linear motion valve that is commonly used in various industries to control the flow of fluids. They get their name from the spherical shape of the valve body. The key components of a globe valve include a movable disc or plug, a stationary ring or seat, and a stem that connects the disc to the actuator (handwheel, electric motor, or pneumatic/hydraulic cylinder).
Here’s how a globe valve works and its typical use:
Operation: When the handwheel or actuator is turned, the stem moves the disc or plug up and down. As the disc is raised, it moves away from the seat, allowing the fluid to flow through the valve. When the disc is lowered, it presses against the seat, cutting off the flow. The flow is thus regulated by adjusting the position of the disc.
Flow regulation: Globe valves offer precise flow control due to their linear motion design. The flow can be accurately throttled by adjusting the opening of the valve. This makes globe valves suitable for applications where flow rate control is essential.
On/off control: While globe valves are great for flow regulation, they can also be used for simple on/off control by fully opening or closing the valve.
Pressure drop: Globe valves can cause a relatively high pressure drop across the valve due to the change in direction of the fluid flow. This characteristic should be taken into consideration when selecting the appropriate valve for a specific application.
Applications: Globe valves find widespread use in industries such as oil and gas, petrochemicals, power generation, water treatment, HVAC systems, and more. They are commonly used in systems handling water, steam, air, gas, and various other fluids.
Advantages: Some advantages of globe valves include their precise flow control, ability to handle a wide range of pressures and temperatures, and suitability for both on/off and throttling applications.
Disadvantages: The main disadvantages of globe valves are their relatively high pressure drop and the potential for higher maintenance requirements compared to other types of valves, such as ball valves or gate valves.
In summary, globe valves are versatile and widely used in industrial applications where accurate flow control and regulation are essential. Their design allows for precise throttling, making them valuable in situations where precise control over the flow rate is necessary. However, their higher pressure drop and maintenance requirements should be carefully considered when choosing the right valve for a specific application.”