Globe Valves: Precise Control for Process Markets
In process plants where accurate flow control is vital, globe valves are some of the most effective and dependable solutions. They have been designed to control liquid, gas, and steam flow with great precision and find themselves integral parts in oil and gas, chemical processing, power generation, and water treatment industries.
At Valvesonly Europe, we are experts at supplying high-quality globe valves suitable for the process industries’ rigorous requirements. Among our selection are globe valve pneumatic types, which provide maximum automation and better control. An understanding of how globe valves operate, their benefits, and variations enables industries to make well-informed choices that maximize their flow control systems.
What are Globe Valves?
A globe valve is a linear motion valve applied to initiate, arrest, and control fluid flow. It consists of a moveable disc or plug that acts on the flow by seating on a fixed ring or seat in the valve body. The flow passage through a globe valve is of a Z-shaped course, which is resistant but permits accurate control of the flow.
Globe valves are extensively applied in flows and pressure regulation in various applications. With their capacity to offer a tight shut-off, as well as precise throttling, globe valves are perfect for use in high-pressure and high-temperature environments.
How Globe valve Function?
The mechanism of a globe valve comprises three basic elements: the body, the disc (or plug), and the seat. The following describes the process:
Opening: As the valve handle or actuator rotates, the disc moves off the seat, enabling fluid to pass through the valve body.
Throttling: The relative position of the disc to the seat controls the flow rate, allowing for very accurate control of the flow.
Closing: When the handle or actuator is rotated in the reverse direction, the disc comes back to the seat, forming a close seal and halting the flow.
The straight movement of the disc has good flow control and secure closing-off and thereby makes the globe valves eminently appropriate to use in flow-modulating processes.
A globe valve pneumatic is an electrically controlled globe valve where a pneumatic actuator operates it. The pneumatic actuator employs compressed air to push or pull the disc and valve stem, which in turn permits controlled fluid flow.
Working of Pneumatic Globe Valves:
- Air Supply: Compressed air is directed to the actuator.
- Stem Movement: Pneumatic force pushes or pulls the stem with the actuator, driving the disc towards or away from the seat.
- Flow Regulation: Flow rate is governed by the location of the disc, making shut-off and precise throttling achievable.
- Automation: The pneumatic actuator may be operated at a distance through remote control, making process control automatic.
Advantages of Globe Valve Pneumatic:
- Quick Response: Pneumatic actuators offer fast but accurate control.
- High Efficiency: Ideal for handling high pressure as well as temperature.
- Remote Operation: Can be incorporated into control systems for automated process control.
- Durability: Constructed to operate in severe industrial conditions.
Ball valve and Globe valve Difference:
Design:
- A ball valve functions with a turning ball having an opening through it, which coincides with the flow direction when open.
- A globe valve uses a linear motion type with a disc that shifts up and down against a seat to regulate the flow.
Flow Regulation:
- Ball valves are best suited for on-off control and rapid shut-off.
- Globe valves are well suited for accurate flow regulation and throttling.
Pressure Drop:
- Ball valves have low pressure drop owing to their linear flow path.
- Globe valves have increased pressure drop owing to the Z-shaped flow path.
Sealing Performance:
- Ball valves offer rapid shut-off but are not so good for fine control of flow.
- Globe valves offer a tight seal and precise control of flow rates.
Applications:
- Ball valves are used for rapid isolation and low-pressure drop applications.
- Globe valves are applied where accurate flow control and pressure control are needed.
Automation:
- Ball valves and globe valves can both be automated using pneumatic or electric actuators, but globe valves are utilized more often for automated flow control.
Durability:
- Ball valves are typically more durable due to their straightforward rotary design.
- Globe valves need more maintenance because of their intricate internal components.
Types of Globe Valves:
Valvesonly Europe provides an extensive assortment of globe valves to cater to different industrial requirements:
- Tee Pattern Globe Valve:
- Z-shaped flow passage offers maximum throttling capacity.
- Greater pressure drops due to complex flow passage.
- Angle Pattern Globe Valve:
- 90-degree turn in the flow passage.
- Suitable for use in cases where piping direction needs to change.
- Wye Pattern Globe Valve:
- Y-shaped design saves pressure drop.
- Applicable to high-flow applications.
- Pneumatic Globe Valve:
- Utilizes a pneumatic actuator for automated functions.
- Has quick and accurate flow regulation.
- Equipped with an electric actuator for automatic control.
- Suitable for remote control applications.
Major Elements of Globe Valves:
- Body: External casing that encloses the internal parts and offers structural support.
- Disc: Regulates the passage of fluid by moving towards or away from the seat.
- Seat: Offers a sealing surface for the disc to achieve a close shut-off.
- Stem: Links the actuator or handle to the disc, enabling motion.
- Bonnet: Encloses the valve body and retains the stem and packing.
- Actuator: Can be pneumatic, electric, or manual, depending upon the application.
Globe Valve Functions:
- Flow Regulation: Regulates the flow rate with precision.
- Pressure Control: Holds the pressure of a system constant.
- Shut-Off: Offers a secure seal to block fluid flow when necessary.
- Throttling: Enables smooth regulation of flow between opened and closed positions.
- Directional Change: Pattern angle globe valves enable directional changes in piping systems.
Why Choose Valvesonly Europe?
At Valvesonly Europe, we believe in delivering the best globe valves that are specifically designed to address the unique requirements of our customers. Whether you require a pneumatic or manual globe valve, our solutions are crafted to offer superior performance as well as longevity. Browse through our collection today and find out why Valvesonly Europe is the go-to choice for globe valves across Europe.
