The primary part of globe valves is to start, stop, or regulate liquid flow. Their structure is designed to regulate or control fluid flow. The globe valve functionality is not limited to shutoff functionality. These differences make globe valves different from other types of valves.
Traditional Globe valves are used for throttling and isolation services. Although the valves show little higher pressure drops than linear valves such as gate and ball. They are used where the pressure drop through the valve is not a controlling aspect. Globe valves are often used to control flow. The degree of pressure drop and flow control must be assumed when creating the valve to stop failure.
What Are Globe Valves?
A globe valve is an instrument that depends on the pressure of the valve stem and sealing surface. They help to fit the sealing surface of the disc and the valve seat to control the medium’s flow. Due to their linear motion and regulating flow, they are most widely used in industry. The disk of a Globe valve can be entirely removed from the flow path or closed the flow path completely.
Valves for high differential pressure throttling services must be specially developed spools.
What Are The Characteristics And Uses Of Globe Valves?
Globe Valve Characteristics
- The valve plays a crucial role in throttling and cutting off the medium in the pipeline. For the cut-off, the valve is sealed by using torque to the valve stem, which is in the axial direction. The valve clack uses pressure to make the sealing surface of the valve clack closely fit. The sealing surface of the valve seat prevents the medium from a leak the sealing surfaces.
- The design of the sealing of the globe valve is of the seat sealing surface, flap sealing surface, and valve stem. The stem system causes the valve flap to shift vertically with the center line of the valve seat. For the function of the globe valve during the opening and closing, the opening height is negligible. During operation, the low is easy to adjust, is fit for care, and the pressure range application is wide.
- The comparison with other used shutoff valves is simple than the former in structure. The shutoff valve is easy to manufacture and maintain. Omit self-life, the sealing surface of the globe valve is not easy to scratch and wear.
- There is no sliding between the seat sealing surface and the valve disc during the working of the valve. So, the abrasion and wear of the sealing surface are small, and the sealing is improved.
During the complete closing process of the service life valve, the height is small, minor disc stroke compared to another valve. The opening and closing torque of the globe valve is simple, and it is hard to perform the quick operation.
Due to the flow path in the valve body, the fluid power is lost in the pipeline, and the fluid flow resistance is significant.
Uses of Globe Valve
Due to straight motion, the globe valves regulate flow in a channel. It channels rotating the handwheel, and you can easily adjust the flow rate to any desired level. The disc acts to close the flow path or obliterate the flow path. A Globe valve controls the flow in the system. The flow rate control and pressure drop must check to prevent premature failure. The most to avoid premature failure is tremendous pressure along the valve disc is just less than 20% of the upstream pressure.
They are also used as control valves; their design makes them excellent control features. Linear characteristics cause valve flow offers more balanced values with the opening percentage. They are also used for regulation purposes. They can be seen in pumping stations as pressure-reducing valves to adjust the inlet flow.
Globe valves are also used in the chemical, oil, and gas industries. They are often used in fire water stations and as stop-check valves. They are used in fuel oil system where leak tightness and regulated flow is essential.
They use where leak tightness is a concern for high-point vents and low-point drains.
- Turbine lubes oil method.
- Cooling water system application.
- Chemical feed and extraction drain systems
- Central steam vents and drains, heater drains, and boiler vents.
In Which Fields Are Globe Valves Applicable?
Globe valves use in different industries where throttling of the material is needed. The rate at which the material flows through the valve can adjust by turning the handwheel. The critical feature of the globe valve is having the valve seat parallel to the flow line. This feature makes the globe valve function efficient when throttling material needs.
This s-shaped configuration in the globe valve creates more resistance within the valve. The globe valve body’s design forces the item’s flow to alter direction within the valve itself. Direction change creates turbulence and significant pressure drop. So, the globe valve is not suggested when pressure drop and flow resistance are to be avoided.
In most installations, the material or liquid is moved into the valve’s body from the disc and below the valve seat. The flow direction uses the pressure of the material to help in the opening process of the valve. It also decreases wear on the disc and the valve seats. But, One deviation is when high-temperature steam is moved through the valve.
The high temperature of the steam-getting valve seat below contrasts the temperature between the disc and the heart. This temperature contrast across the disc and causes the metal-resulting leak. So, when high-temperature steam is passed through a globe valve. This steam moves into the valve from the top of the disc to the material flow.
Globe valves have precise flow control and are resistant to high temperatures. Here are some primary industries where globe valves are used for fluid management.
Fields of Application
- Steam processes
- Fuel oil systems
- Hot oil processes
- Cooling water systems
- Compressed air processes
- Hot and cold-water processes
- Chemical feeding systems or feed water
- Sewer channels, boiler, and central steam outlets
- Turbine lubrication system and others.
Can A Globe Valve Be Used In The Chemical Pipeline?
Globe valve is also widely used when driving out of chemical pipeline processes. The valve is used for the upstream position of the regulating valve or the outlet position of the pump. The globe valve can be divided further into angular globe valve, straight-through globe valve, and y-type globe valve.
Cut-off valves enhance the globe, more wear-resistant than gate valves. They are easier to manage and maintenance of related personnel. But you need to pay attention to make the valve better in working.
The disc is opened and closed with a handwheel and an actuator on automatic valves. Key specifications that make up the valve body are port design and connections, size, and materials. They are used for regulating and shutoff in food processing, wastewater, and process plants.
The standard type is the Z-style valve because of the path which the fluid follows through the valve body. These two right-angle moves the liquid must make through the valve account for the design. Angle Valve style, which turns the flow 90°. The other type is a Y-style valve, which orients the valve stem at 45° to the valve body.
Globe valves can seal the fluid flow on the needs of the installation, and the choice has a role in sizing an actuator.
What is the function of globe valves in the chemical pipeline?
A Globe valve is also often used when carrying out clear chemical channels. A globe valve function is to cause a pressure drop in the chemical pipeline to pass through a bent path.
In pipelines, globe valves can use in heat transfer oil, volatile, toxic, and channels.
All castings for this valve are accurate cast. A Globe control valve whose disc moves along the centerline of the valve seat. The altering of the Valve seat opening is equal to the stroke of the valve disc. The stem of the globe valve has a relatively short space or closing process and a good function. It is very suitable for regulating the flow because of the change in the valve seat opening. Thus, this type of valve is ideal for throttling and blocking.
Summary
However, globe valves are often used in industries or systems where throttling is needed. They are used to regulate the flow of fluid in the pipeline. They are used in the chemical, oil, and gas industries. The fields of application for globe valves are hot and cold water, steam process, and others. Hopefully, you understand the functions and uses of the pipeline system. If you have any questions feel free to contact us.
