A globe valve, different from ball valve, is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body.[1]
Electrically automated 3/4' flanged globe valve
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 or disk.[3][4] 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.
Information[edit]
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 desiged.
Parts of a typical globe valve[edit]Body[edit]
Internal parts of a typical globe valve
The 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.
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,[5] or oriented at an angle (such as a 90°).[6] 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.
Bonnet[edit]
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[5] bonnet. Screw-in bonnet is the simplest bonnet, offering a durable, pressure-tight seal. Union bonnet is suitable for applications requiring frequent inspection or cleaning. It also gives the body added strength. A bonnet attached with bolts is used for larger or higher pressure applications. The bonnet also contains the packing, a wearable material that maintains the seal between the bonnet and the stem during valves.
Plug or disc (disk)[edit]
The closure member of the valve, plugs are connected to the stem which is slid or screwed up or down to throttle the flow. Plugs are typically of the balance or unbalanced type. Unbalanced plugs are solid and are used with smaller valves or with low pressure drops across the valve. The advantages are simpler design, with one possible leak path at the seat and usually lower cost. The disadvantages are the limited size; with a large unbalanced plug the forces needed to seat and hold the flow often becomes impractical. Balanced plugs have holes through the plug. Advantages include easier shut off as the plug does not have to overcome static forces. However, a second leak path is created between the plug and the cage, and cost is generally higher.
Stem[edit]
Stainless steel globe valve
The 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.
Cage[edit]
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.
Seat[edit]
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. Toshiba laptop keyboard and touchpad not working. 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.
See also[edit]
Globe valve
References[edit]
External links[edit]
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Globe_valve&oldid=902810861'
The Globe valves are generally used to control the flow rate andball valve used for open /close purpose only.
A globe valve is a type of valve used for regulating flowin a pipeline, consisting of a movable disk-type element and astationary ring seat in a generally spherical body.
A ball valve is a valve with a spherical disc, the partof the valve which controls the flow through it.
What is the difference between a ball valve and a globe valve?
A globe is designed for throttling and NON quick closing thus no hydraulic waves are caused. A ball type uses a ball normally stainless rather then a washer for a positive shut off
What is the difference between gate valve ball valve globe valve?
A gate valve is a valve that opens by lifting a gate from the path of the fluid. A ball valve is a valve that opens by turning a handle attached to a ball inside the valve. The ball has a hole in the middle so that when the hole is lined up the input side and the output side of the valve, flow occurs. A globe valve is a type of valve used for… Read More
How is Flow is stopped through a globe valve?
If a globe valve is the same as a ball valve and your question is how does it work to stop the flow of water? There is a ball inside the valve that has a hole through the center in the same direction as the handle. When you turn the handle, the hole closes and seals against the sides of the valve. I Globe Vavle is not the same as a Ball Valve. A Globe… Read More
The difference between a map and a globe?
Sunshine autos gta vice city stories. A Map is flat and shows you where to go and a globe a ball showing the continents and/or countries
What is the difference between ball cock valve and Gate valve?
A ball cock is self closing a gate is manually turned on and off
What is ball valve?
A valve normally with a stainless steel ball inside it in lieu of a gate or washer such as a globe pattern valve
Where globe valve is used?
Globe or ball valves are used anywhere a quick and positive transition between fully open and fully closed is needed with minimum travel. A globe valve accomplishes its full action in one quarter turn of its handle.
Difference between ball valve and globe valve?
A ball valve is a valve with a spherical disc, the part of the valve which controls the flow through it. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve, and flow is blocked. The handle or lever will be inline with… Read More
What type of valve can be used instate of globe valve as bypass?Can a ball valve be used in place of a globe valve?
Depends on the applications NOT on high pressure steam as the velocity of the steam will score a ball valve throttling capabilities
What is the Difference between gate valve and ball valve?
Gate valve shuts straight down to close off the line. A ball valve has a hole through it and is rotated to close the line. Gate is used for liquid and ball is for gas but can also be used for liquid.
What is the Difference between plug valve and ball valve?
A plug valave uses a cilindrical kind of element to shut down the flow. The ball valve uses a spherical element to sut down the flow
What is the functional difference between a ball valve and a butterfly valve?
A ball valve is a ball with a hole through it that rotates around its axis to expose the hole for flow or the solid wall of the ball for no flow. The butterfly valve is a flat piece that is supported in the middle by a shaft that opens or closes when the shaft is rotated.
Can a ball valve be used to throttle flow?
no it can't , valves you can use are a prv pressure reducing valve or a globe or flow valve
What's the difference between floating ball valve and fixed ball valve?
The ball ceramic valve evolved from the plug valve, in which there is a plug initially. The ball valves also can be divided into floating ball valve and fixed ball valve. The differences between floating ball valve and fixed ball valve are as follows. For the fixed ball valve, the ball is fixed and will not move even under pressure. There are floating valve seat to press the sing real tightly on the ball when… Read More
What type of valve is used in a peanut butter factory ball or gate or globe or gate?
gate valve. globes are used for throttling and have far too many turns. ball valves are not made for thick stuff. this question was on the inter-provincal exam they had globe valve, gate valve, diaphragm valve and piston valve. for answers too choose from.
Where is a ball valve used?
Where one would use either a gate or globe pattern type A ball valve is used to turn water , gas or oil on and off.
What valves preffered in the upstream and downstream of a control valve ball valve or globe valve?
That would depend on the application such as high steam pressure and if throttling is needed
Can a globe valve be uses as a blowdown valve?
HECK NO READ the ASME code or the NBBI Also read up on valves and what they are designed to do. A 'Globe' valve is used for THROTTLING and severely restricts flow Personally I like using a GATE valve in combination with a ball valve for Blow down applications
What is the difference between a baseball and a golf ball?
What is the difference between a base ball and a golf ball
What is the difference between gatevalve and glaobe valve?
A gate valve raises and lowers a flat piece of metal, usually brass across the opening of the line it is in. A globe valve has a round ball in it with a hole through it. When open, the hole is in line with the line it is in. When closed, the hole is across the line blocking it. Actually A globe valve is used for throttling and is not considered a positive shut off… Read More
Why is a throttling valve called an expansion valve?
It is not. A globe , needle , ball valve are used for throttling For expansion either a shock absorber , diaphragm tank or air chamber are used to allow for expansion
What is the difference between plug valves and globe valves with plug?
A Plug Valve is a Globe Valve. Very generally speaking there are two major catagories of Industrial Process Control Valves, Sliding Stem and Rotary. Globe Bodies valves fall into the category of Sliding Stem Valves. Butterfly and Ball valves fall into the category of Rotary valves. However there are what is referred as Rotary Plug Valves, whereby a partial sphere has a shaft eccentrically mounted, that rotates into and out of a metal or composition… Read More
What is the difference between an air valve and gate valve?
An air valve is a spring loaded plastic valve for ventilation. A gate valve is an old fashioned type of water valve where turning a handle lowers a blocking gate over the water inlet. Any sensible plumber now uses ball valves instead.
What is the difference between reduced bore and full bore valve?
In Full bore ball valve, The bore dia will be same as internal dia of the pipe.In reduced bore, the bore dia is reduced than the ID of pipe.
What is the difference between Trunnion mounted ball valves and floating ball valves?
Sealing Makes all the difference. The key difference beteween a floating ball valve and a trunnion mounted ball valve is how each achieves a line seal. Trunion mounted ball valves are uses a spring mechanism and/or line pressure assistance to drive the upstream seat against the stationary ball. The surface area exposed to the pressure through the relatively small passageway is actually just the back of the seat. The floating ball valve utilize natural line… Read More
What is the difference between cue balls and billards balls?
There is no difference between the cue ball and billiard ball except that the cue ball is white and without significant markings.
Why ball valve is batter then other valve?
Every valve is used for a specific application such as a lift check valve ,soft seat check valve, gate check valve, OS&Y valve, globe , gate and various models of each. A ball valve generally has a higher WOG pressure rating and many use it as one valve fits the majority of applications One would dare not use a ball valve on a fire suppression system or a street main shut off . On high… Read More
What is the difference between a 15 gram ball and a 60 gram ball?
Their difference is that a 15 gram ball is lighter than a 60 gram ball.
What difference between top entry and side entry type of ball valve?
Basically a side entry valve would be in two or three parts, and a top entry valve is a compelete housing, the top entry valve would be used where access is difficult to remove and work on the valve, you can work on a top entry while it is on line where as the side entry valve would have to be removed
What is the difference between 1000 grit and 1000 polished bowling ball?
what the difference between 1000 grit and 1000 polished finish on a bowling ball
What is a ball valve?
A ball valve is a contrivance by which a ball, placed in a circular cup with a hole in a bottom, operates as a valve.
What is the difference of gate valve to gate valve?
a gate valve is a valve you turn the handle round and round until it shuts off a ball valve is a valve with a lever that you turn 1/4 turn and its off hope this helps plumber paul
What is the difference between double-seated and single-seated ball valve?Ball Valve Vs Globe
Double seated ball valves will hold pressure from either end whereas single seated will only hold pressure rating from one end.
What is the difference between a rugby match ball and a rugby training ball?
I believe its in the pre-treatment of the ball. The match ball is pre-stressed at the factory to reduce the flexing of the material when kicked and has a differing type of air valve which is harder wearing to take the impact of the competitive game - it stays inflated to match regulations for longer- this is not the case with a training ball which comes off the production line as is without pre-stressing and… Read More
Is a gate valve is an isolating valve?
yes, a gate valve is designed to operate in the fully opened or fully closed positions,globe and ball valves can be used to throttle flow. Isolation valves are used for diverting process media, facilitating maintenance, equipment removal and shutdown. The operation, application and construction of gate, globe, piston and diaphragm valves are studied in this tutorial.
What is the difference between a red rubber ball and a green apple?
the difference between a red rubber ball and a green apple is... the size, the color, the shape, and the texture ect.. :)
What is the difference between a Golf ball and a tennis ball?
A golf ball is smaller in diameter and is not hollow like a tennis ball is.
What is the Ball valve before pump inlet on pools?What is the difference between a supporter rugby ball and a replica rugby ball?What is the difference between a Bakugan ball and a b2 Bakugan ball?What is the difference between throw me the ball and throw the ball to me?What is the difference between floor ball and hockey?What is the difference between a fast ball and a curve ball?
A fast ball has more velocity and does not move as much as a curveball
Is there a difference between a game ball and a kicking or punting ball?
only if one ball is easyer to punt/kick with one ball
What is the difference between a cricket ball and a tennis ball?
The differences are that a tennis ball is green and furry, and a cricket ball is red and tough.
Can you use gate valve as a regulation valve?
No. Gate valves are designed to be either completely open or completely closed. Regulating flow is best done with a globe or plug valve, or certain kinds of ball valves. A gate valve left partially open will eventually wear down so that it can never be completely closed.
What is the difference between an American golf ball and a European golf ball?What is the difference between a basketball game and a net ball game?What is the difference between a ball and a strike in baseball?
A strike is a hittable pitch and a ball is off the plate.
Gate ValvesThe gate valves are so called because the gate-shaped wedge inside is the most used, as well as the most abused, type of valve. Though designed to isolate or connect fluids, they are sometimes wrongly used for flow control. The gate valve should not be used for controlling the fluid flow or for throttling the flow as it can damage the valve due to the high velocity of fluid when the valve is only slightly open. They are normally used in applications where a minimum restriction to the flow of fluid is a design requirement and only an On-Off type of control is required. Classification of Gate ValvesGate valves can be classified on the following basis:
Comparison between Gate valve and Globe Valve
Use of Gate ValvesThe gate valve must be protected in the following ways:
MaintenanceBall Valve And Globe ValveNormally the gate valves suffer from one common problem after long service and that is the valve becoming tight due to the deposition of silt on the guide ways. This type of complaint is common and is rectified by opening and cleaning the valve. But in case the valve has been misused and has been used for throttling of the flow, generally wire drawing or erosion cutting of the wedge takes place which must be corrected by replacing the valve, unless we have a spare gate from another old valve. The procedure of overhauling the gate valve is as follows:
Testing of the Gate ValvesBall Valve Vs Globe Valve CvThe testing of the valves can be done in a similar way as the globe valves. In brief the valve should be filled up with water and then air should be given from the other side. The presence of air bubbles would indicate bad sealing and must be rectified. References
This post is part of the series: Valves Used Onboard Merchant Ships
The series discusses the different types of the valves used onboard merchant ships worldwide. The maintenance and overhauling of Globe valves, Gate valves, and Butterfly valves has been discussed in this series.
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