Ever wondered why some systems use Plug Valves while others use Globe Valves? These two types of valves might seem similar, but they each offer distinct advantages that can greatly affect how your system functions.

As a Piping Systems Designer with extensive experience in valve selection, I have assisted many businesses in choosing the best valve for their needs.

Plug Valves use a rotating plug to quickly start or stop the flow of fluid, making them perfect for on/off applications. Globe Valves, on the other hand, use a moving disk to control the flow more precisely, which is ideal for applications requiring careful flow adjustment.

In this guide, we will discover how Plug Valves and Globe Valves operate, the main differences between them, how to select the right valve for your specific application, and more.

Let’s get started!

1. Brief Overview of Valves

Valves serve as critical gatekeepers for fluids in pipelines, managing the flow of liquids and gases with precision. Much like how a switch controls the flow of electricity to a light, valves start, stop, or adjust the movement of fluids in various systems. Each valve type is designed for specific functions, tailored to handle distinct tasks and conditions, and is crucial for reliable and efficient operation.

In everyday use, a valve functions like a faucet, controlling fluid flow by opening or closing. Similarly, industrial valves regulate the flow of materials in systems such as pipelines. The increasing demand for such precise control is evident in the global valves market, which is projected to grow at a CAGR of 5.3% from 2022 to 2031, according to Allied Market Research.

2. What is a Plug Valve?

A Plug Valve is a type of valve used to control the flow of liquids or gases through a pipe. It operates with a plug that turns to either allow or block the flow. This simple mechanism makes it quick and easy to open or close the valve. They are designed with a straightforward mechanism that enhances ease of use. Here are some key details about Plug Valves that you should know when considering it for your valves:

Structure of Plug Valve

• Plug: Rotates with a hole to regulate flow.
• Body: Main section that holds all components together.
• Bonnet: Protective cover that allows for maintenance and access to the plug.
• Seat: Provides a tight seal around the plug to prevent leaks.

Types of Plug Valves

• Lubricated Plug Valve: This valve has a special grease between its parts to help them move smoothly. It’s great for high-pressure systems because it keeps the valve working well and lasts longer.

• Sleeve Plug Valve: This valve uses a flexible sleeve instead of a hard plug to control the flow. It’s perfect for handling dirty or rough liquids because the sleeve keeps the inside parts from getting worn out.

• 3-Way Plug Valve: This valve has three openings and can direct the flow of liquid to different paths. It is useful when you need to switch or guide the flow in various directions.

• Eccentric Plug Valve: This valve’s plug is slightly off-center, making it easier to move. It’s ideal for thick or rough liquids because this design makes it run smoother and need less maintenance.

Features of Plug Valve

Quarter-Turn Operation

Plug Valves typically use a 90-degree rotation to open or close. NTVAL’s Plug Valves feature this simple quarter-turn mechanism, allowing for fast and easy operation. This design is ideal for systems where quick changes in flow are needed, enabling rapid adjustments with minimal effort and enhancing overall control.

Low Pressure Drop

Plug Valves are designed to minimize flow resistance, resulting in a low pressure drop across the valve. For example, this characteristic helps keep the system efficient by reducing energy costs, as it allows for smooth fluid flow with minimal energy loss. The streamlined design supports consistent flow rates and helps maintain desired pressure levels.

High Flow Capacity

Plug Valves are designed to handle large volumes of fluid efficiently. Their internal design often allows for a high flow capacity with minimal resistance, making them suitable for applications with demanding flow requirements. Now, this is important because it means Plug Valves can effectively manage substantial fluid flows without causing significant pressure drops.

3. What is a Globe Valve?

A Globe Valve is a type of valve used to control fluid flow in a piping system by moving a disc or plug up and down. This design allows for precise adjustments and reliable shutoff. They are known for their ability to handle various flow rates while providing a tight seal. Here are some key details about Globe Valves that you should know when considering it for your system:

Structure of Globe Valve

• Body: Primary pressure-containing structure, usually spherical or globe-shaped, housing all internal components in contact with the fluid.
• Bonnet: Leakproof closure for the valve body, available in screw-in, union, or bolted designs.
• Plug/Disc: Closure member attached to the stem, moving up and down to control fluid flow.
• Stem: Connects actuator to plug, transmitting actuation force to open or close the valve.
• Cage: Surrounds plug within the valve body, guiding it to the seat for proper shutoff and influencing flow control.
• Seat: Seat ring provides a stable surface for the plug to achieve a leak-tight seal when closed.

Types of Globe Valve

• Angle Globe Valve: This valve has a bent shape that changes the direction of the flow. So yes, it helps reduce pressure loss and is good for tight spaces.

• Bellow Seal Globe Valve: This valve uses a special seal around the stem to stop leaks, especially in high-pressure or dangerous situations. It keeps everything tightly sealed.

• Pressure Seal Globe Valve: Designed for very high-pressure areas, this valve has a special sealing system to handle extreme conditions. It’s used in industries where strong performance is needed.

• Flanged Globe Valve: This valve has flanges on the ends to easily connect to pipes. It’s perfect for larger pipes that need a strong, leak-proof fit.

• Y Pattern Globe Valve: The Y-shaped design helps reduce pressure loss and keeps the flow smooth. It’s used where it’s important to minimize flow resistance.

• Stainless Steel Globe Valve: Made from stainless steel, this valve resists rust and lasts long in tough environments. It’s ideal where both strength and rust resistance are needed.

• Cryogenic Globe Valve: This valve works well with very cold fluids, like liquid nitrogen. It’s designed to handle extremely low temperatures.

• Socket Weld Globe Valve: This valve has socket weld ends that provide a strong, leak-proof connection. It’s suitable for high-pressure and high-temperature uses.

Features of Globe Valve

Bodied Orifice Design

Globe Valves have a special shape inside that guides the flow through a narrow path. This design helps make flow control more accurate, reduces turbulent flow, and provides a steady flow by directing the fluid in a controlled manner. For instance, the precise control offered by this design is especially beneficial in applications where maintaining stable flow rates is crucial.

Precision Machined Seats

Globe Valves have precisely shaped seats that fit tightly. This tight fit prevents leaks and reduces the chance of contamination between fluids. It also enhances the valve’s sealing ability, making it effective in handling high-pressure applications and providing a cleaner operation.

Integral Throttling Mechanism

Globe Valves use a stem and disc to control fluid flow. NTVAL’s expertise in this design allows for precise flow adjustments and maintains a stable flow rate under various conditions. This setup guarantees reliable performance and control, even in complex systems.

4. Key Differences Between Plug Valves and Globe Valves

Understanding the characteristics of Plug Valves and Globe Valves helps in selecting the right valve for specific needs. Both valve types have distinct roles and features, which can influence their suitability for various applications. Let me elaborate on the key differences between Plug Valves and Globe Valves in the table below:

This table provides a detailed comparison, helping to understand the key differences between Plug Valves and Globe Valves, making it easier to decide which valve type best fits specific requirements.

5. 3 Tips for Choosing the Right Valve for Your Needs

When selecting the right valve, it’s essential to evaluate how the valve will be used and the type of control required. Here are some key factors to consider when choosing between Plug Valves and Globe Valves:

#1 Flow Capacity and Pressure

Evaluate the flow rate and pressure needs of your system. For high flow rates and significant pressure demands, Plug Valves are typically suitable as they handle large volumes efficiently with minimal pressure loss. On the other hand, if precise control is needed under varying pressure conditions, Globe Valves are ideal due to their ability to regulate flow accurately despite higher pressure drops.

#2 Valve Material Compatibility

Consider the materials used in the valve’s construction. Plug Valves should be made from materials that resist wear and tear, especially in systems with abrasive or corrosive fluids. In contrast, Globe Valves should be constructed from materials that can handle high temperatures and pressures, as they often deal with more extreme conditions.

#3 Adjustment Frequency

Think about how often the valve needs to be adjusted. If frequent, precise adjustments are required, Globe Valves excel because they allow for detailed control over flow rates. However, if adjustments are infrequent or limited to simply opening and closing, Plug Valves provide a straightforward solution with less need for regular maintenance.

Conclusion

When choosing between Plug Valves and Globe Valves, it’s important to match the valve’s features with your project’s needs. By understanding these differences, you can make more informed choices for your projects.

In conclusion, this guide has provided a clear comparison of Plug Valves and Globe Valves, making it easier to decide which valve suits your needs best. At NTVAL, we excel in offering high-quality valves that cater to both precise control and efficient flow management. For more information, please contact us today to discuss how we can provide the ideal valve solutions for your specific requirements.

Dive Deeper Into Our Resources

Looking for more diverse product options? Browse through our handpicked selections:

• Gate Valve
• Ball Valve
• Globe Valve
• Check Valve
• Plug Valve
• Butterfly Valve

For some insightful reads, we’ve curated a list of recommended articles just for you:

• Top 7 Valve Manufacturers in Europe
• What Are Industrial Valves?