Globe Valves
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Globe Valves
Globe valves are another common type of valve used in various industries to regulate or throttle the flow of fluids within a piping system. Globe valves feature a globe-shaped body with a movable disc (or plug) that regulates the flow of fluid through the valve. The disc is connected to a stem that moves up and down to open or close the valve. When the valve is fully closed, the disc seats against the valve inlet to stop the flow completely.
There are four main types of Globe Valves :
- Forged Steel Globe Valve
- Bolted Globe Valves
- Pressure Seal Globe Valves
- Bellow Sealed Valves
Applications:
Globe valves are commonly used in applications where precise control of flow rate is required, such as in HVAC systems, steam systems, process control, and water treatment plants. They are suitable for both high-pressure and low-pressure systems and can handle a wide range of temperatures and fluids.
Maintenance:
Regular maintenance is important to ensure the proper functioning of globe valves. This may include lubricating the stem, inspecting the disc and seat for wear or damage, and cleaning the valve internals.
Advantages:
• Precise flow control: Globe valves offer excellent throttling capabilities, allowing for precise adjustment of flow rate.
• Good shutoff capability: When fully closed, the disc seats tightly against the valve inlet, providing reliable shutoff.
Specifications
| Testing Standards: |
BS 5146 |
|---|---|
| Size Ranges: |
2″-16″ (DN50-DN400) |
| Class: | 150-2500 |
| Material of Construction: | WCB, WCC, WC6, WC9, C5, C12, LCB,LCC, CF8, CF8M, etc. |
| Seat: | A105+13%Cr, A105+Steelited. |
| Trim: | API No 1 to 16. |
| Face to Face: | As per ASME B16.10 |
| Actuation: | Manual, Gear, etc. |
| End Connection: | ANSI B16.5(Raised Flanged), ANSI B16.25(Butt Weld) |
Navjivan's Globe Valve
Forged Steel Globe Valve
Forged steel globe valves are essential components in piping systems across various industries. They offer reliable flow control, isolation, and throttling capabilities, making them suitable for high-pressure and high-temperature applications.
Design and Construction:
• Forged steel globe valves are typically constructed from high-quality forged steel materials such as ASTM A105, ASTM A182 F11, F22, or stainless steel ASTM A182 F316. This construction provides excellent strength, durability, and resistance to corrosion.
• Forged steel globe valves are available with threaded, socket weld, or flanged ends to suit various piping configurations.
• Bolted bonnet or pressure seal bonnet designs are commonly used to ensure a secure seal even at high pressures.
• The globe valve’s plug or disc is designed to press against the seat, providing a tight seal to prevent leakage.
Materials of Construction:
• Forged steel globe valves are typically constructed from high-quality forged steel materials such as ASTM A105, ASTM A182 F11, F22, or stainless steel ASTM A182 F316. This construction provides excellent strength, durability, and resistance to corrosion.
• The disc and seat are designed to provide tight sealing and efficient flow control. They are often made from hardened materials such as stainless steel, Stellite, or other hard-facing alloys to withstand wear and ensure longevity.
Standards and Certifications:
• Forged steel globe valves are manufactured in accordance with industry standards such as API 602 or ASME B16.34 for forged steel valves.
• Material certifications and compliance with other standards (API, ANSI, ISO, etc.) are available upon request.
Navjivan's Globe Valve
Bolted Globe Valves
Bolted globe valves are a type of industrial valve used to control the flow of liquids or gases through a pipeline. They are named for their globe-like shape, with a spherical body and a movable disk (or plug) that regulates the flow by either being raised or lowered onto the seat, controlling the passage of fluid.
Design and Construction:
• Bolted globe valves typically consist of a body, bonnet, disk (or plug), stem, and seating surfaces. The body is usually spherical or cylindrical in shape, with flanged ends for connection to piping systems.
• The bonnet houses the stem and disk assembly, providing a seal to prevent leakage. The disk is the movable component that regulates flow, while the stem connects the operator (such as a handwheel or actuator) to the disk.
Materials of Construction:
• Bolted globe valves are typically made from materials such as carbon steel, stainless steel, cast iron, bronze, or exotic alloys like Hastelloy or Inconel, depending on the specific application requirements including fluid compatibility, temperature, and pressure.
Standards and Certifications:
• Globe valves are often manufactured according to industry standards such as API (American Petroleum Institute), ANSI (American National Standards Institute), ASTM (American Society for Testing and Materials), and ASME (American Society of Mechanical Engineers).
• They may also be certified to meet specific regulatory requirements such as those of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code.
Navjivan's Globe Valve
Pressure Sealed Globe Valves
Pressure-sealed globe valves are a specific type of globe valve designed for high-pressure and high-temperature applications. They feature a unique pressure seal bonnet design that enhances their ability to withstand extreme conditions without leaking.
Design and Construction:
• Pressure-sealed globe valves have a robust design featuring a pressure seal bonnet arrangement.
• Unlike conventional bolted bonnet globe valves, pressure-sealed valves utilize a threaded, welded, or bolted bonnet that forms a pressure-tight seal with the valve body.
• This design eliminates the need for a gasket, reducing the risk of leaks in high-pressure applications.
Materials of Construction:
• Pressure-sealed globe valves are typically constructed from high-quality materials such as carbon steel, stainless steel, alloy steel, or other specialized alloys suitable for high-pressure and high-temperature environments.
• The choice of materials depends on factors such as the fluid being handled, operating conditions, and corrosion resistance requirements.
Standards and Certifications:
• Pressure Sealed Globe Valves are manufactured in accordance with industry standards and specifications such as API (American Petroleum Institute), ASME (American Society of Mechanical Engineers), ASTM (American Society for Testing and Materials), ANSI (American National Standards Institute), and other relevant standards.
• They may also undergo testing and certification processes to ensure compliance with regulatory requirements and quality standards.
Navjivan's Globe Valve
Bellow Sealed Globe Valves
Bellows sealed globe valves are a specific type of globe valve designed with a bellows seal to provide additional protection against leakage, particularly in applications involving hazardous or corrosive fluids, or where fugitive emissions must be minimized.
Design and Construction:
• Bellow sealed globe valves feature a bellows assembly that is integrated into the bonnet of the valve. The bellows typically consist of a series of convolutions made from a flexible metal such as stainless steel.
• This bellows assembly creates a hermetic seal between the valve stem and the bonnet, preventing the process fluid from coming into contact with the stem or escaping to the atmosphere.
• The bellows design also compensates for thermal expansion and contraction, ensuring reliable sealing even under fluctuating temperature conditions.
Applications:
• Bellow sealed globe valves are commonly used in industries such as chemical processing, pharmaceuticals, petrochemicals, oil and gas, power generation, and refineries, where leakage prevention and environmental safety are paramount.
• They are suitable for handling a wide range of fluids, including corrosive chemicals, toxic gases, and volatile substances. Bellow sealed globe valves are often used in processes involving cryogenic temperatures, high pressures, or hazardous materials.
Standards and Certifications:
• Bellow sealed globe valves are manufactured in accordance with industry standards and specifications such as API (American Petroleum Institute), ASME (American Society of Mechanical Engineers), ASTM (American Society for Testing and Materials), ANSI (American National Standards Institute), and other relevant standards.
•They may also undergo testing and certification to ensure compliance with regulatory requirements and quality standards, including fugitive emission standards such as ISO 15848 and TA-Luft.
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