Definition of globe valve：
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The opening and closing member (valve new) driven by the valve stem, along the valve seat (sealing surface) axis to do linear lifting movement of the valve is called a globe valve.
Globe valve is generally driven by the drive parts (handwheel, stem, valve body, valve cover, valve flap (closure) and packing assembly, and other major components. The handwheel is connected to the valve stem, and the valve flap is driven by the valve stem, so that the valve flap moves reciprocally along the direction of the valve seat axis, thus making the pipeline connected or cut off.
The globe valve is widely used, mainly for higher pressure and smaller caliber occasions, generally only produced to DN400 (NPS 16), the larger diameter specifications only for special pipelines. For example, a large oxygen pipeline, due to the existence of other valves friction is prone to static fire, so the use of a large-diameter stainless steel globe valve.
The working principle of the globe valve：
Globe valve stem generally do rotary lifting movement, handwheel fixed in the top of the stem. When the handwheel is rotated clockwise, the stem threads rotate down, the valve sealing surface and the valve seat sealing surface in close contact, and the shut-off valve closes; when the handwheel is rotated counterclockwise, the stem threads rotate up, the valve sealing surface and the valve seat sealing surface disengage, the shut-off valve open.
The advantages and disadvantages of the globe valve:
The advantages of the globe valve:
#1 Compared with the gate valve, the globe valve structure is simpler, usually only one sealing surface on the valve body and valve flap, small sealing area, saving valuable materials, low cost, and therefore better manufacturing process, easy maintenance.
#2 The seal surface wear and abrasion are light, good sealing. No relative sliding between the valve flap and body sealing surface when opening and closing (except for the conical sealing surface), so the wear and abrasion are not serious, good sealing performance, and long service life.
#3 Opening height is small, generally only 1/4 of the diameter of the valve seat channel, compact structure, saving installation space.
#4 Precise flow control: Globe valves are particularly useful for applications that require precise control of fluid flow. They can be adjusted to provide a wide range of flow rates, making them suitable for a variety of industrial applications.
#5 High-pressure rating: Globe valves can handle high-pressure applications because of their unique design. This makes them ideal for use in piping systems where pressure is a critical factor.
#6 Good shutoff capability: Globe valves have a good shutoff capability, which is particularly useful in applications where tight shut-off is required. This helps ensure that the valve prevents the flow of fluids in both directions.
#7 Versatility: Globe valves can be used with a wide range of fluids, including gases, liquids, and slurries. This makes them useful in a variety of industries, including petrochemical, manufacturing, refining, and water treatment.
#8 Long lifespan: Globe valves are durable and can last for many years with proper maintenance, which can save money over the long term. They are also less prone to leakage, which can prevent damage to equipment or surrounding areas.
Disadvantages of globe valve:
#1 Pressure drop: Globe valves are known to create a significant pressure drop across the valve when fully open, due to their inherent design. This can reduce the efficiency of the system and require additional energy to maintain flow rates.
#2 Size and weight: Globe valves are generally larger and heavier than many other types of valves, which can make them more difficult to install and require larger support structures.
#3 Cost: Globe valves can be more expensive than some other types of valves due to their complexity and precision required for manufacturing and installation.
#4 Maintenance: Globe valves have multiple internal components that can wear or become damaged over time, requiring more frequent maintenance than simpler valve types.
#5 Limited suitability for high flow rates: Globe valves can be prone to cavitation and erosion in high-flow applications, which can limit their suitability for certain situations.
Globe valves can be classified based on different criteria. Here are some of the common classifications of globe valves:
#1. Based on design: Globe valves can be classified based on their design, such as T-pattern, Y-pattern, and angle pattern. Each design has unique characteristics, such as better flow control, reduced pressure drop, or being more suitable for high-pressure applications.
#2. Based on valve body material: Globe valves are made from different materials, including stainless steel, carbon steel, bronze, brass, and cast iron. The material used for the valve body and other components depends on the type of fluid to be handled, pressure, temperature, and durability requirements.
#3. Based on the valve stem: Globe valves can be classified based on the type of valve stem used, such as rising stem, non-rising stem, or rotary stem. The stem type determines the way the valve disk or plug is moved to regulate or shut off the flow of fluid.
#4. Based on the number of ports: Globe valves can also be classified based on the number of ports, such as single-port or double-port. Single-port globe valves have one inlet and one outlet port. Double-port, or 3-way, globe valves have three or more ports, which allow for more complex flow path configurations.
#5. Based on the operating mechanism: Globe valves can also be classified based on their operating mechanism, such as manual, electric, pneumatic, hydraulic, or solenoid-operated. The operating mechanism determines how the valve is opened or closed and is based on the application requirements.
The following application conditions are suitable for globe valves:
#1. High-pressure applications: Globe valves are suitable for high-pressure piping systems, where there is a high risk of fluid escaping.
#2. Precise flow control: Globe valves are ideal for controlling the flow rate of process fluids with high precision.
#3. High-temperature applications: Globe valves can perform well in high-temperature environments where other valve types may be prone to failure.
#4. Corrosive or abrasive fluids: Globe valves are suitable for use with corrosive or abrasive fluids due to the availability of valve components with specific material compatibility.
#5. Liquid services: Globe valves are commonly used in liquid services, such as water treatment plants or chemical processing facilities.
#6. Process control: Globe valves are effective in controlling process conditions, such as pressure, temperature, or flow rate, where accuracy is essential.
#7. High-viscosity fluids: Globe valves can handle high-viscosity fluids, such as slurries or lubricants with a higher degree of precision.
Overall, globe valves are ideal for applications requiring precise control, good shutoff capability, and adaptable flow rates. They provide accurate adjustments in the flow of fluids and are reliable in controlling pressure and temperature conditions in a piping system.
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The globe valve is a linear motion valve used to stop, start, and regulate fluid flow.So when we are using in our industry, we are considering about why we choose it. This article is about this.
The following knowledge points are listed below:
1. What is globe valve
The globe valve is a linear motion valve, mainly used to stop, start and adjust the flow. The flap of the globe valve can be completely removed from the flow channel, or it can be completely closed.Conventional globe valves can be used for isolation and throttling applications. Although these valves have a slightly higher pressure drop than straight-through valves (such as gate valves, plugs, ball valves, etc.), they can also be used where the pressure drop through the valve is not a controlling factor. The globe valve is used for throttle flow control. Closing is achieved by moving the flap in the direction of the fluid, rather than passing through the fluid like a gate valve. The flow pattern through the globe valve changes the flow direction, resulting in greater resistance to flow, which results in higher pressure drop. The globe valve is an excellent valve suitable for high-pressure steam operation. Our globe valves are factory-made and use high-quality materials for long-term use.
Globe valve refers to a valve whose valve plate moves along the center line of the valve seat. According to this form of valve movement, the change in valve seat opening is proportional to the valve stroke. Because the opening or closing stroke of the valve stem is relatively short, it has a very reliable cut-off function, which is very suitable for flow regulation. Globe valve can be divided into external thread type and internal thread type according to thread size. Globe valves can also be divided into linear and angular types according to the flow direction. The globe valve can also be divided into DC type and angle type according to the flow direction. Globe valve can be divided into packing seal type and bellows seal type according to its sealing form.
2. The advantages and disadvantages of globe valve
advantage:
(1) Close function
(2) Moderate to good throttling ability
(3) Shorter stroke (compared to gate valve)
(4) Available in all modes, each providing unique capabilities
(5) Seats that are easily refurbished by machines or surfaces
(6) If the disc is not attached to the valve stem, the valve can be used as a check valve
Disadvantages:
(1) Higher pressure drop (compared to gate valve)
(2) Need more force or bigger actuator to install the valve (there is pressure under the valve seat)
(3) Throttling flow is below the valve seat, closing flow is above the valve seat.
(4) high head loss from two or more right angle turns of flowing fluid.
(5) Large-diameter valves require considerable power to operate and are particularly noisy in high-pressure applications
(6) The large opening required for the valve disc assembly, heavier weight than other valves with the same flow rate, and the overhanging valve disc is installed on the valve stem.
3. The application of globe valve
The following are some typical applications of globe valves:
Cooling water system requiring flow adjustment
Fuel system flow regulation and tightness are very important
When tightness and safety are the main considerations, high point vents and low point drainage
Water supply, chemical raw materials, condenser air extraction, and extraction drainage system
Boiler exhaust and drain, main steam exhaust and drain, heater exhaust
Turbine seal and drainage
Turbine lubricant system
That’s all about the advantages and disadvantages of globe valves, do you get it?
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