A globe valve is an instrument used to stop and/or control the flow of fluids in a pipeline. It works by halting the flow of a fluid through a pipe. The name globe comes about due to the valve's cylindrical shape. There are usually two halves of the body within the globe valve that are separated by an internal baffle.
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Even though globe valves exhibit more pressure drops than gate valves, you can use them where the pressure drop via the valve is a non-controlling factor. Another name for globe valves is throttle valves when they are used for throttling purposes.
What is the purpose of a globe valve, and what is it used for?
Many types of valves can be designated as globe valves. They could be isolation valves, control valves, and more. As mentioned earlier, the globe refers to the spherical shape of the valve body.
The primary purpose of a globe valve is to halt, start, and regulate liquid and gas flow in pipes. It usually has a movable disk-type component and a non-moving ring seat in a cylindrical body. The globe valve's seat is at the center and side-by-side to the pipe, while the seat's opening is shut off using a disk or plug. The structure of globe valves allows them to handle flow in both directions.
What makes Trillium isolation gate valves different?
Many types of valves can be designated as globe valves. They could be isolation valves, control valves, and more. As mentioned earlier, the globe refers to the spherical shape of the valve body.
The primary purpose of a globe valve is to halt, start, and regulate liquid and gas flow in pipes. It usually has a movable disk-type component and a non-moving ring seat in a cylindrical body. The globe valve's seat is at the center and side-by-side to the pipe, while the seat's opening is shut off using a disk or plug. The structure of globe valves allows them to handle flow in both directions.
What is the most common application of a globe valve?
Globe valves are primarily used in a basic water faucet. Upon turning the handwheel, there is lowering or lifting of the disc. If the disc is lowered to the maximum, the water supply completely shuts off. However, when the disc is at its topmost position, the flow of water is at its highest rate. A globe valve may be sealed in more extensive industrial settings using an electrical actuator rather than a manual handle.
There is usually a baffle inside a globe valve. This baffle makes the liquid change its direction and goes through the baffle. This means that the fluid cannot flow as freely and causes the pressure in the valve to drop. Globe valves are incompatible with slurries or thicker liquids that the baffle can obstruct.
What industry or company uses globe valves?
Where appropriate, globe valves can be used in many process industries. However, their application determines the valve's internal construction. For instance, a globe control valve would be trimmed with internal components designed to control the process fluid.
Globe valves are widely used in the plant piping industry and can be operated manually or automatically. Unlike gate valves, globe valves will help regulate pressure flows and complete the flow of liquids or their complete shutoff.
Globe valves are mostly cast due to the complex shape of the flow passages. However, they can also be made from wrought materials for specific applications.
The disc and seat rings that globe valves are cast with are mostly made with bronze. On the other hand, steel-globe valves with temperatures exceeding 350°C have their trim made of stainless steel. This is crucial in providing resistance to seizing and galling. It is vital to heat-treat the valve's mating faces to derive differential hardness values. Manufacturing globe valves also involves using other trim materials like cobalt-based alloys.
It is also vital to grind the seating surface to achieve full-bearing surface contact during valve closure. An extended disk locknut maintains alignment for lower pressure classes, with disc guides cast into the valve body for higher pressures. Usually, the disc face and seat ring galling are prevented by the disc turning freely on the stem.
Our reliable legacy brands and team of dedicated support and services experts ensure that you have a trusted partner who adds value at every phase of your project cycle. You can count on valve from Trillium Flow Technologies for complete flow control success. Our globe valves come in different styles, materials, and features to help regulate the flow of fluids in a variety of mediums and applications.
A globe valve, different from ball valve, is a type of valve used for regulating flow in a pipeline, consisting of a movable plug or disc element and a stationary ring seat in a generally spherical body.[1]
Globe valves are named for their spherical body shape with the two halves of the body being separated by an internal baffle. This has an opening that forms a seat onto which a movable plug[2] can be screwed in to close (or shut) the valve. The plug is also called a disc.[3] In globe valves, the plug is connected to a stem which is operated by screw action using a handwheel in manual valves. Typically, automated globe valves use smooth stems rather than threaded and are opened and closed by an actuator assembly.
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Although globe valves in the past had the spherical bodies which gave them their name, many modern globe valves do not have much of a spherical shape. However, the term globe valve is still often used for valves that have such an internal mechanism. In plumbing, valves with such a mechanism are also often called stop valves since they don't have the spherical housing, but the term stop valve may refer to valves which are used to stop flow even when they have other mechanisms or designs.
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Internal parts of a typical globe valveThe body is the main pressure containing structure of the valve and the most easily identified as it forms the mass of the valve. It contains all of the valve's internal parts that will come in contact with the substance being controlled by the valve. The bonnet is connected to the body and provides the containment of the fluid, gas, or slurry that is being controlled.
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Globe valves are typically two-port valves, although three port valves are also produced mostly in straight-flow configuration. Ports are openings in the body for fluid flowing in or out. The two ports may be oriented straight across from each other or anywhere on the body,[4] or oriented at an angle (such as a 90°).[5] Globe valves with ports at such an angle are called angle globe valves. Globe valves are mainly used for corrosive or high viscous fluids which solidify at room temperature. This is because straight valves are designed so that the outlet pipe is in line with the inlet pipe and the fluid has a good chance of staying there in the case of horizontal piping. In the case of angle valves, the outlet pipe is directed towards the bottom. This allows the fluid to drain off. In turn, this prevents clogging and/or corrosion of the valve components over a period of time. A globe valve can also have a body in the shape of a "Y". This will allow the construction of the valve to be straight at the bottom as opposed to the conventional pot type construction (to arrange bottom seat) in case of other valves. This will again allow the fluid to pass through without difficulty and minimizes fluid clogging/corrosion in the long term.[citation needed]
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The bonnet provides a leakproof closure for the valve body. The threaded section of the stem goes through a hole with matching threads in the bonnet. Globe valves may have a screw-in, union, or bolted[4] bonnet. Screw-in bonnet is the simplest bonnet, offering a durable, pressure-tight seal. Union bonnet is suitable for applications
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The valve's closure mechanism involves plugs that connect to a stem, which is adjusted either by sliding or screwing it up or down to regulate flow. Plugs come in balanced or unbalanced types. Unbalanced plugs, typically solid, are suitable for smaller valves or those with low pressure drops. They offer advantages such as simpler design, with potential leakage only at the seat, and usually lower cost. However, they are limited in size, as larger unbalanced plugs may require impractical forces to seal and control flow. On the other hand, balanced plugs feature holes through the plug itself. They offer advantages such as easier shut-off due to reduced static forces required. However, they introduce a second potential leak path between the plug and the cage, and they tend to be more expensive.
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Long-stemmed globe valveThe stem serves as a connector from the actuator to the inside of the valve and transmits this actuation force. Stems are either smooth for actuator controlled valves or threaded for manual valves. The smooth stems are surrounded by packing material to prevent leaking material from the valve. This packing is a wearable material and will have to be replaced during maintenance. With a smooth stem the ends are threaded to allow connection to the plug and the actuator. The stem must not only withstand a large amount of compression force during valve closure, but also have high tensile strength during valve opening. In addition, the stem must be very straight, or have low run out, in order to ensure good valve closure. This minimum run out also minimizes wear of the packing contained in the bonnet, which provides the seal against leakage. The stem may be provided with a shroud over the packing nut to prevent foreign bodies entering the packing material, which would accelerate wear.
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The cage is a part of the valve that surrounds the plug and is located inside the body of the valve. Typically, the cage is one of the greatest determiners of flow within the valve. As the plug is moved more of the openings in the cage are exposed and flow is increased and vice versa. The design and layout of the openings can have a large effect on flow of material (the flow characteristics of different materials at temperatures, pressures that are in a range). Cages are also used to guide the plug to the seat of the valve for a good shutoff, substituting the guiding from the bonnet.
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The seat ring provides a stable, uniform and replaceable shut off surface. Seat are usually screwed in or torqued . This pushes the cage down on the lip of the seat and holds it firmly to the body of the valve. Seat may also be threaded and screwed into a thread cut in the same area of the body. However this method makes removal of the seat ring during maintenance difficult if not impossible. Seat rings are also typically beveled at the seating surface to allow for some guiding during the final stages of closing the valve.
Economical globe valves or stop valves with a similar mechanism used in plumbing often have a rubber washer at the bottom of the disc for the seating surface, so that rubber can be compressed against the seat to form a leak-tight seal when shut.
Electrically automated 3/4" flanged globe valve[
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