There are different types of valves, such as ball valves, pin valves, etc. There are different valve types, such as globe valves with other parts and styles and the distinct working principle. A globe valve is the type of linear motion valve used for starting, stopping, and regulating the liquid flow in the pipeline. A Globe valve is not a directional valve nor used in either direction.
There are three positions of the globe valve such as:
- It can close the path completely.
- It can remove the way of the flow.
- Between the valve seat and back seat for regulating liquid flow.
Working Principle Of Globe Valve
The globe valve is the process that restricts the fluid flow in the pipeline by any obstruction material, which is known as the disk. When rotating the clockwise handle wheel, the valve plug and steam will move downward across the fluid flow line. It can result in the blockage of the liquid without any signs of leakage.
When turning the wheel of the handle anti-clockwise, steam and the valve plug will move upward across the flow line of the liquid, and the valve will open up from the closed position, which allows the fluid to flow through the globe valve.
How Does Globe Valve Work?
Now that we know that it is used for regulating and shutting off the fluid. It can also work the valve’s seat in the middle and parallel to the pipe. The opening in the seat will be closed with the help of the disk. When turning the handle, whether you do it manually or with the help actuator, the mechanism will lower or raise the disc using the valve stem. The fluid flow is completely blocked (turned off) when the disc is reduced entirely.
Parts Of The Globe Valve
The globe valve manufacturer makes the following globe valve parts:
· Handwheel
The handwheel is fitted with the help of the threaded stem on top of the nut. The valve operation is executed by the rotating handwheel anti or clockwise.
· Bonnet
The bonnet is among the outer globe valve parts connected to the body for providing a leak-proof closure. In different types of globe valves, different types of the bonnets such as screw-in, union, or bolted in use. Every bonnet style comes with its share of benefits.
The union bonnet, for instance, not only adds strength to the body but is also ideal for applications that require frequent cleaning or inspection. Due to the simple design, the screw-in bonnet offers a pressure-tight seal. The last bonnet type will be bolted bonnets attached with bolts and are ideal for higher pressures.
· Gland Packing
The gasket will form a tight seal between the valve stem and the bonnet. You can use it to keep the liquid from leaking out of the valve stems. The gland followers on most of the valves are sealed until the valve does not leak. Leakage happens due to loose packaging. Tight packing impairs the movement of the valve and can cause stem damage.
There are various types of packing accessible along with elastomers, PTFE, fibrous material, and others. The valve packaging and manufacturing design reduce the risk of stem damage and leakage of the fluid. It is imperative to consider that over-tight packing can harm the stem.
· Seat Ring
The seat is amongst the global components to seal the space between stem and bonnet. It can be screwed into the valve or torqued. It is also known as the seat ring, which offers a stable and replacement shutoff surface. Seat rings will be secured firmly to the cage.
· Stem
The valve’s stem is known for correctly positioning the disk and offering the needed movements to the disc, ball, or plug to open or close the valve. It is a globe valve component connected to the handwheel on the actuator of the valve to transmit the actuation force.
Stem can connect the actuator to the parts within the globe valve among the essential parts. The actuator-controlled stem is smooth, whereas the manual step valve is threaded.
· Disc
The disk or plug is also among the essential parts of the globe valve components. It tends to move perpendicular to the seat and can block or free the flow due to its functions as a moveable physical barrier. When the valve is closed, it lets the material flow. For the globe valves, various disk arrangements have been designed along with composite type, needle type.
The hybrid disk comes with a better shutoff, whereas you should use the ball in low-temperature and low-pressure systems. When comparing it to the other two, the disk of the needle offers better throttling.
· Body
The body of the valve is the primary structure holding everything together. It contains all of the internal parts of the globe valve, allowing control of the substance needing to be regulated. The opening of the body comes with the parts allowing the fluid flow to the globe valve.
· Cage
It is intended for encircling the step and plug within the globe valve. The cage is amongst the governing flow inside the globe valve. The material flow within the valve depends on the design and the layout of the openings.
Uses Of Globe Valve
Globe valves will come in handy due to applications which help to regulate the flow, but the constant flow of fluid is not needed. Below are examples of the typical applications for globe valves.
- Cooling water systems in which regulates the flow
- A fluid system that regulates flow and offers leak-proof abilities is highly essential.
- It is also used for chemical feed, feedwater, extraction drain, air extraction, and other industries.
These are not all of the uses of the globe valve. Connect with the manufacturer to get more insight.
Conclusion
You should know all the essential information when choosing a globe valve for you. Make sure to keep in mind that choosing the right type of valve is essential as it can be cost-effective or costly depending on how you use it and the type of valve you choose.
