Gate Valve And Globe Valve Difference: A Detailed Comparison

gate valve vs globe valve

Any piping system must have valves to regulate the flow of fluids and gases.

Two of the most commonly used valves in industrial and commercial settings are Gate Valves and Globe Valves.

Although these valves have similar functions, they have distinct differences in terms of their construction, working mechanism, and applications.

In this post, we will take a detailed look at the differences between Gate Valves and Globe Valves, including their construction, working mechanism, maintenance, symbols, types, and applications.

We will also go through how to pick the ideal valve for your individual requirements.

This post will serve as a comprehensive guide for anyone looking to understand the key differences between gate valves and globe valves.

What is Gate Valve?

A gate valve controls the flow of fluids and gases by moving a gate up and down to open and close the flow.

These valves are typically used in applications requiring a full, unrestricted flow, such as in water supply systems, oil and gas pipelines, and steam systems.

They are inappropriate for flow regulation or throttling because they are only intended to be fully open or closed.

Gate valves are distinguished by their straightforward, uncomplicated form, which makes them simple to produce and maintain.

They are also designed to handle high-pressure applications and are typically used in systems that operate at high temperatures.

Due to their versatility and durability, gate valves are widely used in various industrial and commercial settings.

They are considered a reliable and cost-effective option for controlling the flow of fluids and gases.

Gate Valve Construction

Gate valves are made of a body, gate, stem, hand wheel or actuator, seats, packing, and a bonnet.

Their size and pressure rating influence their construction; larger and high-pressure valves are built of stronger materials such as cast steel.

Gate Valve Working Mechanism

The working mechanism of gate valves is simple: they control the flow of fluids and gases by moving a gate up and down. 

The gate is connected to a stem that is, in turn, connected to a hand wheel or actuator.

Between the inlet and exit, in the middle of the valve body, is where the gate is located.

When the gate is in the fully open position, the flow of fluid or gas is unrestricted, and when it’s in the fully closed position, the flow is completely blocked.

Maintenance for Gate Valve

Proper maintenance is crucial for gate valves’ longevity and reliable operation. Steps to follow include:

  1. Lubrication: Lubricate the stem and hand wheel with high-temperature lubricant at least once a year.
  2. Tightening: Regularly check the bolts and tighten them as necessary to prevent leakage and ensure proper performance.
  3. Inspection: Inspect the valve for any wear or damage, such as cracks, corrosion, or leaks. Replace or repair the valve if necessary.
  4. Cleaning: Regularly clean the valve to remove any debris or buildup affecting its performance. Use a soft brush and mild cleaning solution to remove any buildup.
  5. Stem Packing Replacement: Over time, the stem packing can become worn and may need to be replaced. If you notice leakage around the stem, it’s a sign that the packing needs to be replaced.
  6. Proper Storage: When storing gate valves, keep them in a dry, clean, and protected place. This will prevent corrosion and other forms of damage.
  7. Professional Maintenance: Have a professional inspect and maintain the valve at least once a year. A professional can identify and fix any issues that may not be visible to the untrained eye.

It’s important to note that gate valves should be shut off and drained before performing any maintenance.

Also, it is recommended to use the correct tools and techniques to avoid any damage to the valve or injury to the personnel.

Gate Valve Symbol: How To Identify it?

Gate valve symbols represent the valves in piping, instrumentation diagrams, and other process control documents. 

They are standardized, and it’s important to correctly identify them to understand the process flow and control systems.

The standard symbol for a gate valve is a rectangle with a diagonal line, the direction of the line indicating the flow direction.

A circle or semicircle at the top of the rectangle indicates the hand wheel or actuator, and a small arrowhead may indicate flow direction.

The standard symbol may not be the only symbol used; it’s important to check the legend or key of the P&ID to understand specific symbols and conventions.

Types of Gate Valve

Gate Valves are available in various types to suit different applications and requirements. The following are some of the most typical kinds of gate valves:

  1. Solid Wedge Gate Valve: The body of this kind of gate valve has a solid wedge-shaped gate that slides up and down. Because of its high-pressure and high-temperature capabilities, it is commonly used in water supply systems, steam systems, and oil and gas pipelines.
  • Flexible Wedge Gate Valve: The body of this type of gate valve features a flexible wedge-shaped gate that can move up and down. It is typically utilized in water supply systems, HVAC systems, chemical and petrochemical industries, and other low-pressure, low-temperature applications.
  • Parallel Slide Gate Valve: This gate valve features an internal parallel gate that slides up and down. It is usually utilized in chemical and petrochemical industries, power plants, and HVAC systems and is appropriate for precise flow control.
  • Split Wedge Gate Valve: This gate valve has an internal wedge-shaped gate that may be raised and lowered. It is usually utilized in chemical and petrochemical industries, power plants, and HVAC systems.
  • Rising Stem Gate Valve: The stem of this type of gate valve rises when the valve is opened. It is usually utilized in chemical and petrochemical industries, power plants, and HVAC systems and is appropriate for precise flow control.
  • Gate valves with non-rising stems: do not have stems that rise when the valve is opened. It is usually utilized in chemical and petrochemical industries, power plants, and HVAC systems and is appropriate for precise flow control. A knife-shaped gate is a feature of this gate valve, which cuts through particles or thick, viscous fluids. It is frequently applied in wastewater treatment, mining, and paper and pulp industries.

Applications Of Gate Valve

Gate valves are a standard part of industrial and commercial environments because they are robust and adaptable.

A few typical applications are water supply systems for controlling water flow, oil and gas pipelines, steam systems, chemical and petrochemical plants, and power plants for controlling the flow of water, steam, and other fluids.

They direct the flow to various regions of the system and are used to isolate sections for upkeep or repairs.

How To Choose a Gate Valve?

The following factors should be considered when selecting a gate valve: 

● Size

● Material

● Actuation

● Connection

● End Connection

● Flow Control

● Environment

● Standards

● Price

The valve must be compatible with the fluid or gas flowing through it and the system in which it will be employed. 

 

It must adhere to industry and safety standards and be environment-friendly. 

 

To ensure the valve is appropriate for the particular use, it is advised to speak with a specialist or the manufacturer.

 

 

 

 

 

What is Globe Valve?

A globe valve, also known as a linear motion valve, is a mechanical device to control the flow of liquids and gases in a pipeline.

This valve comprises a cylindrical body with a disk-shaped internal component that can be adjusted to alter the opening size for flow regulation.

Globe valves are recognized for their ability to provide precise flow control, and as such, they are often employed in various industrial and process control settings.

Globe Valve Construction

It is constructed with a cylindrical body divided into two parts:

  • Bonnet
  • Body 

The internal mechanism of the valve comprises a disk-shaped element known as a “plug” or“obturator” and a stem that connects the plug to the valve’s operating handle.

The plug sits on top of a seat inside the body, and when the stem is turned, the plug moves in a linear direction, either opening or closing the valve.

The valve’s body is typically made of cast iron, steel, or bronze, while the plug and stem are often made of stainless steel or other corrosion-resistant materials.

It also contains a gland packing to prevent leakage between the stem and the bonnet.

Globe Valve Working Mechanism

The globe valve controls flow by moving a disk-shaped element (plug) in a linear direction towards or away from a seat; the plug’s position regulates the opening size for flow control.

The flow can be fully opened or closed by adjusting the position of the plug on the seat.

The valve can handle high pressure and temperature, is suitable for different fluids and gases, and is extensively used in industrial and process control settings.

Maintenance for Globe Valve

The following are some standard maintenance practices for globe valves:

  1. Lubrication: The valve’s stem and other moving parts should be lubricated regularly to ensure smooth operation and prevent seizing.
  • Tightening: The valve’s bonnet bolts should be checked and tightened if necessary to prevent leakage.
  • Cleaning: The valve and its components should be cleaned regularly to remove debris and prevent corrosion.
  • Inspection: The valve should be inspected regularly for signs of wear, damage, or leakage. If there are any issues, they should be addressed immediately to prevent further damage.
  • Testing: The valve should be tested regularly to ensure proper operation and to identify any problems that may have developed.
  • Repair or replacement: If a valve is found to be damaged or malfunctioning, it should be repaired or replaced as soon as possible to prevent further damage and ensure proper operation.

Globe Valve Symbol: How To Identify it?

A Globe valve symbol is typically represented by a circular body with a straight stem and a disk-shaped closure element. 

The stem is connected to the disk, which can rotate within the valve’s body to control fluid flow.

To identify a globe valve symbol, look for a circle with a stem protruding from the center and a disk-shaped element attached to the stem.

Types of Globe Valve

There are several types of globe valves, each with its own unique characteristics and uses.

  1. Angle globe valves have a 90-degree angle between the inlet and outlet ports, making them ideal for tight spaces.
  • Y-pattern globe valves have a Y-shaped body with two inlet ports and one outlet port. They are often used in applications where multiple flows need to be combined or separated.
  • Stop-check globe valves: These valves are designed to stop fluid flow in one direction while allowing it to flow in the other direction. They are often used in applications where the flow needs to be controlled or stopped quickly.
  • Bellows-sealed globe valves: These valves have a bellows-sealed stem, which provides a high-pressure seal that can withstand extreme temperatures and corrosive fluids.
  • Cryogenic globe valves: These valves are specifically designed to handle low-temperature fluids, such as liquid natural gas.
  • High-pressure globe valves: These valves are designed to handle high-pressure applications and can withstand high-pressure loads.
  • Control globe valves: These valves are used to control the flow of fluid, pressure, or temperature in a system.
  • Pressure-sealed globe valves: These valves have a pressure-sealed bonnet design that provides a high-pressure seal and can withstand extreme temperatures and corrosive fluids.
  • Three-way globe valves: These valves have three ports instead of two, allowing the flow to be directed in different directions.
  1. Electric-actuated globe valves: These are operated by an electric actuator, providing precise control and easy automation.

Applications Of Globe Valve

Globe valves are versatile and widely used in various industrial and commercial applications to control the flow of fluids and gases.

They are commonly found in:

  • Power plants
  • Oil and gas industry
  • Chemical processing
  • Water treatment
  • HVAC systems
  • Marine operations
  • Food and beverage
  • Pharmaceutical
  • Mining industry

How To Choose a Globe Valve?

When choosing a globe valve, it is important to consider the type of fluid, pressure and temperature rating, flow control capabilities, size and dimension, actuation, and certifications that match industry standards and safety regulations. 

It’s also important to consult with experts and consider the project’s specific needs and the environment where the valve will be installed.

Main Differences between Gate Valve and Globe Valve

  1. Design: A gate valve has a flat gate that moves up and down to open or close the fluid flow, while a globe valve has a circular disc that moves in and out to control the flow.
  • Flow control: Gate valves are used for full open or full close applications, while globe valves are used for precise flow control.
  • Flow direction: The flow direction in a gate valve is perpendicular to the gate, while in a globe valve, the flow direction is parallel to the disc.
  • Pressure drop: The pressure drop across a gate valve is lower than a globe valve.
  • Application: Gate valves are commonly used in pipelines to control the flow of liquid, gas, or steam, while globe valves are used in process control applications for precise flow control in high-pressure systems.
  • Size: Globe valves are typically smaller than gate valves.
  • Construction: Gate valves typically have a simpler design and construction than globe valves.
  • Cost: Globe valves tend to be more expensive than gate valves due to their more precise flow control capabilities.

Which One is Better?

When selecting a valve for a specific application, it’s important to evaluate the system’s needs and consider various factors such as flow control, pressure drop, size, cost, and application.

Gate valves are known for their ability to be fully opened or fully closed, which makes them ideal for applications where precise flow control is not crucial.

Additionally, they are typically more durable, have a lower pressure drop, and are widely used in pipelines that carry liquid, gas, or steam.

On the other hand, globe valves are specifically designed for precise flow control in high-pressure systems and are particularly well-suited for process control applications.

They tend to be smaller in size and more complex in design and construction, making them more expensive than gate valves.

In conclusion, the choice between a gate valve and a globe valve ultimately depends on the specific requirements of the system and the application it is used for.

It’s important to weigh all the factors and make an informed decision based on the system’s needs.

Conclusion

You can contact us if you are still confused about choosing between the two valves or looking to source one for your needs. We at Inoxcnvalve can help you choose the right fit and provide good quality at a better price than the market.

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