Reliable Globe Valves Supplier in China

What Exactly Is A Globe Valve?

Throttle globe valves use a linear motion to move a closure into and out of the valve seat, with the valve body being a spherical chamber. They are designed to control process flow, pressure, or temperature when combined with an actuator assembly. A cage or retainer-style design is used in many single-seat bodies to hold the seat seal, provide plug guiding, and give a method for determining the flow characteristics of a specific valve. Single-seat globe valve bodies with cage or retainer structure may also easily adjust flow characteristics by changing the trim, enabling decreased capacity flow, noise reduction, or decreasing or eliminating cavitation.

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How Globe Valve Works

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Typical Applications

Globe valves provide users exceptional performance and reliability and come in a range of sizes from DN15 to DN900. They can assist in meeting a variety of application demands, from general to severe, small size to big size, hot temperature to cold temperature.

Different kinds of bonnets are offered to handle various application temperatures. To protect packing materials when the valve is used in highly hot or cold situations, this principally includes basic bonnets and optional extension bonnets.

For situations where the packing system must keep fugitive emission concentrations below environmental requirements, there are additional specific packing arrangements.

Boiler and main steam vents and drains, fuel oil systems, feedwater or chemical feed systems, turbine lubrication oil systems, and cooling water systems are just a few of the many places where globe valves are used.

Adaptability Of Valve Plugs

Globe valves can be equipped with either balanced or unbalanced valve plugs. Balanced plugs permit equal process pressure above and below the valve plug, with the normal flow down through the seat ring. Unbalanced valve plugs are solid with no through the hole, and flow is typically upward via the seat ring.

There are various ways to guide the plug in globe valves, the most popular of which are cage guided and post-guided. Cage-guided assemblies come in both balanced and unbalanced plug configurations. This method of guiding employs the outside diameter of the plug to touch the inside diameter of the cage, which provides excellent plug stability and alignment but necessitates extremely tight tolerances between the plug and cage. The seat retainer is used in place of the retainer in the post-guided assembly. The seat retainer has a guide cage that guides the post on the plug. Because this method provides for an unobstructed flow route around the plug, the back-guided trim is better appropriate for viscous and unclean fluids.

Trim Designs

Globe valves can be linear, equal percentage, or quick opening and can satisfy capacity demands from 0.001 Cv up to 12,000 Cv through a variety of trims with various flow characteristics.

Additionally, there are specialty trims that may be used in clean or unclean applications to stop noise and cavitation problems.

What Is Globe Valve Used For?

A globe valve can be opened, closed, or adjusted to the desired flow rate. Valves can be manipulated either manually or mechanically.

As an example, the petroleum sector uses globe valves because they have several benefits.

Globe valves are often used in control and isolation systems. This motion is straightforwardly linear. Since this is the case, it can quickly allow or restrict fluid flow. It makes for a secure seal. This is why globe valves are commonly utilized in the petroleum industry.

What Is The Difference Between Globe Valve And Gate Valve?

Internal Components Differ Between Gate Valves And Globe Valves

A gate valve’s closing element is a plate or disk like a “gate” that is parallel to the plane of the valve seat.

The globe valve’s closing part, known as the “plug,” travels perpendicular to the plane of the valve seat.

Gate Valves And Globe Valves Serve Different Purposes

Globe valves have a high capacity for throttling, but gate valves are not employed for throttling. Gate valves are ideal for isolation, whereas globe valves are ideal for regulating or throttling.

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Globe Valve Vs. Gate Valve

Globe and gate valves are the most common types of valves in the industry, each having its own unique functions and design features. Below, we highlight the key distinctions between globe valves and gate valves:

Globe Valve

Structure

For newbies, the gate valve may be very similar to the globe valve. But if you take close look at these two different valves, you will find the gate valve is much simple, a gate/disc you can see at the top of the valve body. When the gate valve is opened, the gate/disc will upward action, and complete on the top part of the bonnet, and the body becomes hollow.

But for the globe valve, the plug and seat are complete inners of the valve body. The design permits impediments that help the globe valve in its primary function of throttling and providing positive shut-off. Additionally, the design allows for variations in flow rate and direction, which can lead to a high-pressure drop.

Tight Shut-Off

When compared to a gate valve, a globe valve cannot close tightly. Pipeline gate valves provide a tight shut-off feature. Gate valves are utilized upstream of globe valves due to their tight shut-off abilities. This gate and globe valve combination may have been visible at the discharge pipe of a pump.

Torque

A globe valve needs more torque to operate. This higher power consumption for globe valves is also taken into account when constructing automated and motorized valve actuators.

Function

When gate valves are used to regulate flow, we witness noise, vibration, and seat/disk damage, so gate valves were not designed to regulate flow. In the event that a gate valve is unavailable, a globe valve might be utilized to stop and start the flow. Generally speaking, a gate valve is only utilized for isolating fluid. As designs exist for both directions of flow, a gate valve can be utilized in either direction.

Disc Shape

The opening and closing geometry of the valve disc/plug and seat also differ between globe valve and gate valve.

Maintainance

Globe valves can be maintained in place, while almost all gate valves need to be removed from the piping system in order to make repairs for leakage problems.

Differential Pressure

A gate valve will bind and be impossible to open against a large differential pressure, while a globe valve can. The seat will score and leak if you attempt to open against high differential pressure.

Applications

The gate valve is perfect for uses where low-pressure losses are essential. It is a multidirectional valve. The globe works best in settings where large pressure variations are not a concern. Globe valve only has one direction, and you will see an arrow mark on the body to show the flow direction.

Gate valves are linear valves that belong to the family of shutoff valves. The gate valve is widely used to isolate media because its wedge-shaped disc can effectively shut off fluid. This type of valve is suitable for applications requiring a tight seal. For thicker and more viscous fluids, the knife gate valve is the best choice.

Since there is no blockage in the media flow path, gate valves only cause minor pressure drops. The valve opens by the upward movement of the gate disc. It closes by lowering the disc to connect with the seats. The disc of a gate valve can be shaped as a wedge, a knife, or a parallel plane.

The gate valve is not utilized to control the flow of media, although having considerable throttling capacity. Due to the thinness of its disc, it might get misaligned from its seat as a result of media vibration. Its service life is shortened and harm is caused by this situation. The gate valve should completely open or fully close when in operation to increase the lifespan of the valve.

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Globe Valve Symbol

Each type of valve is represented by a different symbol. The globe valve is denoted by the symbol:

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What Is The Advantage Of Globe Valve?

Excellent shutdown capabilities
Throttling capacity ranging from moderate to excellent
Shorter Travel(compared to a gate valve)
Available in tee, wye, and angle designs, each with its own set of advantages
Seats are simple to machine or resurface
Globe valve can be utilized as a stop-check valve when the disc is not connected to the stem.

What Is The Disadvantage of Globe Valve?

High-pressure loss (compared to gate valve)
Requires higher force to drive the valve to open or close.
Obstructions and channel discontinuities can generate a considerable pressure decrease.
Pulses and shocks in large high-pressure pipes can damage decorative parts on the inside.
Heavier compare to gate valve
More complicated design than gate valves.
One direction fluid way

Globe Valve VS. Ball Valve

Here is what makes a globe valve different from a ball valve:

What Is A Globe Gate Valve?

Globe valves are control valves that are used to control, start, and stop the flow of media through a pipe. They feature a spherical body shape the appearance; on the inside, a plug fits on the end of a threaded rotating stem that is upward and downward to control media flow. Globe valves are a type of linear motion valve, which indicates that the valve mechanism moves in a straight line.

Globe valves provide a tight seal with minimum leakage, making them a great choice in high-pressure industrial pipe systems.

Gate valves are excellent for applications requiring tight shutoff or isolation. In the half-open state, gate valves cannot withstand a strong flow of media and are thus not utilized to regulate flow. They are utilized in industrial oil and gas pipe systems, water systems, and maritime sectors.

What Is Another Name For A Globe Valve?

Globe valves can alternatively be referred to as throttling valves or throttle trip valves.

Throttle Trip Valves are a single, highly reliable valve assembly that can control flow and shut off in an emergency. The throttling valve controls the flow of steam and gas in large, high-pressure pipelines, like the main steam line for a high-pressure turbine or the gas supply line for a turboexpander. As trip valves, they add a crucial level of safety to these uses without the cost of a separate trip valve. When manually or automatically tripped, the valves quickly stop the flow of water to protect expensive equipment.

Advantages

When the throttle trip valve is opened, the pressure on the main disc is released by a pilot valve inside the valve. The seal-welded seat ring fits tightly to the body and has an expansion groove to keep the seating face from distorting. Gaskets of the flexitallic type seal well at all cover joints. The yoke and latching assembly are made to be easy to adjust while it is in use. To save space and enable the use of smaller operators, venturi seats can be offered in high-pressure applications. For direct connections to steam turbines, valves can be made with either welded ends or ANSI flange connections.

Is A Needle Valve A Globe Valve?

A needle valve is used to precisely regulate the flow of clean gases or liquids. Smooth flow control is achieved by gradual changes to the stem and plunger. The needle valves often feature a small flow capacity and a large pressure drop. Standard needle valve port diameters range from DN2 to 12 mm(1/8″ to 2″). A needle valve’s most typical application is to regulate gas flow, such as propane in a tank. Need valve is a kind of globe valve.

Control Valves Types

Metal Fabrication

What Exactly Is A Globe Valve?

How Globe Valve Works

Typical Applications

Adaptability Of Valve Plugs

Trim Designs

What Is Globe Valve Used For?

What Is The Difference Between Globe Valve And Gate Valve?

Gate Valves And Globe Valves Serve Different Purposes

Globe Valve

Globe Valve Symbol

What Is The Advantage Of Globe Valve?

What Is The Disadvantage of Globe Valve?

Globe Valve VS. Ball Valve

What Is A Globe Gate Valve?

What Is Another Name For A Globe Valve?

Is A Needle Valve A Globe Valve?

Control Valves Types

a. According to the Function of the Control Valves

b. According to the Nominal Pressure of the Control Valves

c. According to the Different Actuator Type For Control Valves

d. According to the Closure Member’s Movement