The bellows are made of high-strength materials and offer excellent...
Read Article >Globe valves are not recommended when resistance to flow and pressure drop is objectionable. Though, they are generally ideal for throttling and preferable when a valve gets operated frequently.
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Bronze |
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Bronze |
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PN21 |
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DN15-DN80 |
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BSPF |
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Cast Iron |
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Bronze |
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PN14 |
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DN15-DN300 |
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AS2129 Table E / ANSI |
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Epoxy Coating / Actuator |
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Forged Steel |
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Stellite |
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PN62 |
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DN15-DN50 |
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AS2129 Table D,E,F,H,J&K /ANSI /DIN |
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Bronze |
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Stainless Steel |
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PN40 |
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DN10-DN80 |
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BSPF |
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SDNR / NPTF |
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Bronze |
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Stainless Steel |
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PN35 |
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DN20-DN80 |
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AS2129 Table E, F & H / ANSI |
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Bronze, Carbon Steel (WCB) |
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Stainless Steel |
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PN35 |
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DN15-DN300 |
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AS2129 Table D, E, F & H / ANSI |
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Pintle guided plug |
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Bronze, Carbon Steel (WCB) |
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Stainless Steel |
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PN35 |
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DN15-DN300 |
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AS2129 Table D, E, F & H / ANSI |
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Stainless Steel |
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Stainless Steel |
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PN10 |
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DN15-DN50 |
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BSPF |
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Epoxy coating / Actuator |
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Carbon Steel (WCB) |
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Stellite / CR13 |
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ANSI 150/300/600 |
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DN15-DN600 |
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ANSI RF |
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Drilling to suit AS2129 Table D, E, F & H /ANSI / DIN |
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Forged Steel (A105) |
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Stellite |
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PN138 (ANSI 800) |
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DN15-DN50 |
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ANSI RF |
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Drilling to suit Table D, E, F & H / ANSI / DIN |
In globe valves, the route taken by the flow is not straight but varies, leading to greater flow resistance and a more significant pressure drop than in other valve types. This contrasts gate valves, whose seating arrangement is perpendicular to the flow; in globe valves, it’s parallel. When the valve is opened, the disc and seat no longer make contact, allowing the flow to begin.
A notable feature of globe valves is their reduced disc travel distance. This design means fewer rotations are needed to operate the valve, which translates to time savings, reduced effort, and less wear on the valve components.
However, there might be better choices than globe valves in situations where flow resistance and pressure drop are critical concerns. Despite this, they are highly effective for throttling purposes and are preferred in scenarios where frequent valve operation is necessary.
Our commitment to industry to supply quality globe valves, we have made these technical sheets available. If you need further information or can’t find the sheet you need, please make a technical enquiry.
Designed for versatility, our bronze globe valves, featuring screwed bonnets and integral seats, are an economical choice for various general-purpose applications.
They provide throttling control and isolating flow, making them suitable for sectors like hospital services, canteen equipment, and agricultural instrumentation.
Durable construction allows for straightforward reconditioning of the seating faces after prolonged use.
The John 101 and 102 models in our soft seat globe valve collection are distinguished by their union bonnets, renewable composition discs, and integral seats.
These valves are adept at handling isolation tasks in medium and low-pressure steam and hot water services.
They find widespread use in hospital equipment, canteen appliances, heating systems, and various industrial processes.
Our collection of cast iron and carbon steel globe valves is characterised by a simple yet robust design tailored to meet a broad spectrum of industrial applications.
Their construction and functionality are designed to cater to diverse working conditions, offering a reliable solution for various industry needs.
The John Fig 245, part of our forged carbon steel globe valve series, is engineered for high-pressure and high-temperature services.
These outside screw globe valves are equipped with stellite-faced valve discs and body seats as standard, ensuring durability and reliability under demanding operational conditions.
Excellence in the design and engineering of globe valves is pivotal in achieving optimal performance, durability, and reliability in various industrial applications. Key aspects include carefully selecting materials, such as bronze, stainless steel, or carbon steel, tailored to specific operational environments, ensuring resistance to corrosion, high temperatures, and pressure variations.
Advanced engineering techniques are employed to create ergonomic designs that facilitate more effortless operation and maintenance, with features like union bonnets and integral seats for improved sealing and flow control.
Additionally, the adaptability of globe valves to various modifications, like stellite-faced discs for high-temperature service, showcases the ingenuity and flexibility in their design. This commitment to excellence extends the valves’ lifespan. It ensures efficiency and safety in industries ranging from healthcare to heavy manufacturing, underlining the globe valve’s role as a cornerstone in modern fluid control technology.
The operation mechanism of globe valves is a blend of precision engineering and practical design, crucial for effective fluid flow control in various applications. Central to this mechanism is the linear motion of the valve disc, moving perpendicularly to the fluid flow, enabling meticulous regulation of flow rate.
Integral components, such as the stem, disc, and seat, work in unison; the stem transmits the actuation force, while the interaction between the disc and seat controls fluid passage. Handwheels or actuators apply the necessary force for operation. Globe valves excel in throttling, offering fine control over the flow with a characteristic tortuous path that, while contributing to a higher pressure drop, ensures superior control.
Their design emphasises maintenance ease, allowing access to critical parts like the disc and seat for servicing without complete valve removal. Operational efficiency is further enhanced by reduced disc travel, necessitating fewer turns for valve actuation and minimising wear.
Globe valves find extensive use across a diverse range of industries due to their reliability, precise control, and versatility. Here are some of the key industry applications:
Employed in pipelines and processing facilities for regulating the flow of oil, natural gas, and other petrochemical products.
Utilised for controlling the flow of various chemicals, providing the necessary precision & safety required in handling hazardous materials.
In water systems, globe valves are prized for their ability to throttle flow, allowing for precise control of water flow rates.
Used in various stages of food and beverage production for controlling the flow of liquids, steam, and other substances.
Employed in processing plants for precise control of liquids and gases, ensuring the quality and safety of pharmaceutical products.
Essential for controlling ballast, fuel, and water systems on ships and in maritime infrastructure.
Used for controlling the flow of liquids and gases in mineral extraction and processing operations.
Integral in regulating steam and hot water systems for heating and cooling purposes in commercial and residential buildings.
Used for controlling water flow in irrigation systems and in various agricultural processing applications.
Utilised for regulating the flow of chemicals, water, and slurries in the manufacturing of paper products.
Used in cooling systems, fuel delivery systems, and other critical areas in power plants, hydroelectric, and thermal power generation.
Employed extensively in steam distribution networks for effective regulation and isolation.
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A gate valve is used to control the flow of liquid, gas, or slurry in a pipeline. It is ideal for on/off control of the flow, rather than for flow regulation. Gate valves are commonly used in water and wastewater treatment, oil and gas pipelines, and in various industrial processes.
A gate valve operates by lifting a rectangular or round gate out of the path of the fluid. When the valve handle or actuator is turned, it moves the stem and the gate vertically, allowing or blocking the flow. In the open position, the gate is fully retracted, providing a full bore for the fluid to pass through with minimal resistance.
A gate valve is better suited for on/off control, providing a tight seal and minimal pressure drop when fully open. A ball valve, on the other hand, is good for both on/off and throttling services due to its spherical disc that can be partially or fully rotated to control the flow.
Generally, gate valves are not recommended for throttling purposes. Continuous operation in a partially open state can cause damage to the gate and seats due to the high velocity flow and turbulence.
Gate valves provide a minimal pressure drop when fully open, offer tight sealing when closed, have a relatively simple design, and are cost-effective, especially for larger sizes. They are also suitable for high-pressure and high-temperature applications.
Regular maintenance of a gate valve includes periodic inspection for leaks, checking the stem and screw mechanism for smooth operation, and ensuring that the valve seats and gate are free from damage or corrosion. Lubrication of moving parts and stem threads may be necessary, depending on the valve’s design and application.
Gate valves are made from a variety of materials, including cast iron, stainless steel, brass, bronze, and PVC, depending on their intended use. The choice of material depends on factors like the fluid type, pressure, temperature, and environmental conditions.
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