Globe Valve Buyer's Guide (2021 Update)

Globe valve control the flow by the linear motion of disk, they are used in many industries, and it’s vital to learn about the valve before using it.

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There are several basic components of a Globe valve.

1. Bonnet

Bonnet provides a leakproof closure for the globe valve body. Globe valve can have two types of bonnets. Screw-in Bonnet; is a simple type of bonnet bolted to the body with high bolting torque. It provides a durable and pressure-tight seal. The other one is Union Bonnet; it is suitable for places where frequent cleaning and inspecting is done.

2. Cage

The part that surrounds the plug is called the cage. It is present inside the valve’s body and significantly influences the flow through the valve. As the plug or disk is moved, more part of the cage is exposed, and the flow will increase.

3. Stem

The stem is the component that joins the handwheel to the disk/plug. It transfers the force from the handwheel to the disc, which consequently controls the flow. Stem is a smooth rod with threaded ends to move up and down with the rotation of the handwheel.

4. Disk/Plug

The disk is the part that sits on the seat and stops the flow. Disk is attached to the stem and moves with the rotation of the handwheel. There are two types of plugs. Unbalanced plugs are solid and typically used in small globe valves with low-pressure drop. While the balanced plug has holes, it is easy to shut this plug because we don’t have to fight with static force.

5. Seat

The last part is the seat; it provides a stable surface for the disk to shut off. It is either screwed or integrated into the body.

The working of the globe valve is straightforward. When the handwheel is rotated in a clockwise direction, the stem will move downward, pushing the disk towards the seat. Lesser the difference between the seat and plug, the lesser will be the flow and vice versa. In the end, the disk will sit tightly over the seat ring, completely shutting off the fluid flow.

Similarly, the anti-clockwise movement will pull the disk away from the seat, which will open the valve allowing the fluid to flow freely.

Types of Globe Valve are described below

• Forged Globe Valve
• Pressure Seal Globe Valve
• DIN Globe Valve
• Flange Globe Valve
• Angle Globe Valve

Forged Globe Valve

Forged ones are compact and robust globe valves. This is outside screw and yoke type valves with rising stem and handwheel. Forged globe valves are optimal for high pressure and temperature applications. It comes in both bolted and welded bonnet type.

Pressure Seal Globe Valve

The pressure seal globe valve is used in very high-pressure applications, typically over 170bar. The unique pressure seal bonnet hardens the seal as the pressure rises internally. Unlike other valves in which high pressure damages the bonnet. It is widely used in pressure steam, liquid catalytic reformers and hydrocrackers.

DIN Globe Valve

This type has a casted full-bore design with an inside screw. The plugs are different in DIN, and it has to follow the specific DIN specifications. The valve is perfect for regulation.

Flange Globe Valve

The flange is a compact type of globe valve. This type of valve is great with high and low temperatures and is commonly used in general engineering and marine applications.

Angle Globe Valves

It is a unique globe valve it turns the fluid flow by 90° without using any elbow or extra pipe. In this, the disk opens up against the flow. Thus, the valve is perfect where the flow is fluctuating. Moreover, it can easily handle the slugging effect.

Globe valves are pretty helpful in many industries; they have many benefits like throttling and complete closure. Moreover, the ability to work as a check valve and short opening and closing time.

Below are some applications of Globe valves in industries.

Oil & Gas

Oil & Gas industry is one of the biggest users of globe valves due to their high-pressure bearing ability. Even special globe valves are designed specifically for oil & gas industries that can handle the immense pressure of psi. Globe valves are used in deep wells.

Oil & Gas industries are using globe valves with special equipment. The valve is processing lethal gases like sour gas, using special techniques. Sour gas production occurs due to the presence of Hydrogen Sulphide in raw petroleum.

Chemical & Pharmaceutical

The Chemical & Pharma industries are among the biggest users of valves from small plants to massive factories; all of them have valves, especially globe valves. Most of the applications are of low pressure in these industries.

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The reason for its popularity in the chemical industry is its ability to completely seal the outlet and preventing even the smallest leak. Moreover, it has some protective layer because some corrosive chemical can react with the valve’s body.

Other Applications

Globe valves are profusely used in power plants, process plants, wastewater plants, where they regulate and shuts the flow.

It is also used in coolant loops, lubrication system and steam lines. In these places, flow regulation is necessary, which can only be attained by the globe valve.

They are used in big apartment buildings where the fluid is moving upstream.

Choosing the suitable globe valve for the right function is crucial.

Here are some elements that you should consider before selecting a Globe Valve

Type of Fluid

In this, you will consider the type of material that will be passing through the valve. Every fluid has its properties, and corrosive fluids react differently with different valve material. It is better to perform thorough research to understand how the media will react with the valve. It is crucial because it can affect the output.

Price

Once you are done with the media, then the next thing is the price. There are tons of websites and shops selling high-quality globe valve in different price ranges. So, look at as many shops and websites as you can and compare the price. This step will help you get the best possible deal.

Don’t rush your purchase. Take your time in comparing and then choose the right one.

Compatibility

Look for the valve that will perfectly fit your system. Before buying, get to know about installation and assembly of valve to know if this will be the perfect fit for your system.

Type of Globe Valve

There are three types of globe valve, and every valve has different properties and usage. Therefore, do consider the type of valve before buying a globe valve.

Dimensions of the Pipe and Valve

Dimensions of the valve are pretty necessary. In this, you will determine the length of the pipe and get a glove valve accordingly.

Construction

Construction is one of the most important things; it is vital for everything you are going to buy. In globe valve, the construction is beneficial because it will reduce the maintenance cost by preventing damage and will last for an extended period.

Incompatible Material

It is one of the leading cause of valves failure. Sometimes the body material is good, but stem, disk and seat material are incompatible. The incompatible material is highly prone to wear and tear.

To avoid this issue, consider the compatibility of the entire valve before buying.

Exceeding Pressure and Temperature

The valve is not responsible for this damage. At times there is an acute change in pressure and temperature of the flowing fluid. This factor has severe damage on the stem, disk and seat of the valve.

Defective Actuator

The actuator is responsible for turning the handwheel to manage the entry and exit of the fluid. Choosing the wrong actuator will shorten the life of the globe valve. The incorrect voltage can cause overheating, which can cause a fire.

Incorrect Installation

Incorrect installation is rare, but it happens. It can be avoided by a comprehensive study of assembling and installing guide from installation.

Lack of Maintenance

Everything needs proper maintenance after each period of time. The same is the case with globe valves; they need special care and inspection after a while.

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