An ANSI cast steel globe valve is a type of valve designed to regulate the flow of fluid through a pipeline. It features a globe-shaped body with an internal mechanism, typically a movable disk or plug, that can be raised or lowered to control the flow of the fluid.
The term "ANSI" refers to the American National Standards Institute, which sets standards for various industrial products, including valves. ANSI standards ensure that valves meet certain criteria for dimensions, materials, pressure ratings, and performance.
ANSI cast steel globe valves offer several advantages in industrial applications:
Durability: Cast steel is known for its strength and resistance to wear and corrosion, making ANSI cast steel globe valves suitable for demanding environments and long-term use.
High Pressure and Temperature Capability: Cast steel globe valves are designed to withstand high pressures and temperatures, making them suitable for applications in industries such as oil and gas, power generation, and chemical processing.
Versatility: These valves are available in a wide range of sizes, pressure ratings, and configurations, allowing them to be used in various applications and systems.
Reliable Performance: ANSI standards ensure that these valves meet strict criteria for performance and quality, providing reliable operation and minimal downtime.
Precise Flow Control: Globe valves are well-suited for applications that require precise control of flow rate, such as throttling or regulating flow in pipelines.
Ease of Maintenance: ANSI cast steel globe valves are typically designed for easy maintenance and repair, with accessible components and straightforward disassembly/reassembly procedures.
Wide Range of Applications: These valves are used in diverse industries, including oil and gas, petrochemical, power generation, water treatment, and more, highlighting their versatility and reliability.
Overall, ANSI cast steel globe valves offer robust construction, reliable performance, and versatility, making them a preferred choice for many industrial applications where precise flow control and durability are essential.
The operation of an ANSI cast steel globe valve involves the movement of a disk or plug within the valve body to control the flow of fluid through the pipeline. Here's how it works:
Valve Body: The body of the globe valve typically has a globular shape, hence the name "globe valve." It consists of an inlet and an outlet port, with a chamber in between where the disk or plug is housed.
Disk or Plug: Inside the valve body, there is a disk or plug mechanism that can move up and down (or linearly) within the chamber. This disk or plug is connected to a stem, which extends outside the valve body for manual operation via a handwheel or actuator.
Flow Control: When the valve is in the fully open position, the disk or plug is lifted or moved away from the valve seat, allowing fluid to flow freely through the valve with minimal obstruction. As the disk or plug is lowered or moved towards the seat, it restricts the flow of fluid, eventually stopping it completely when the valve is fully closed.
Sealing Mechanism: When the disk or plug is in the closed position, it forms a seal against the valve seat, preventing any leakage of fluid through the valve. This sealing mechanism ensures that the valve provides tight shut-off when closed, minimizing the risk of leaks or spills.
Regulating Flow: Globe valves are particularly well-suited for applications that require precise control of flow rate. By adjusting the position of the disk or plug within the valve body, operators can regulate the flow of fluid through the pipeline to meet specific process requirements.
Actuation: In addition to manual operation via a handwheel, ANSI cast steel globe valves can also be equipped with actuators for automated control. Actuators, such as electric, pneumatic, or hydraulic actuators, can be used to remotely operate the valve, allowing for automated flow control based on process parameters or signals from a control system.
Overall, the operation of an ANSI cast steel globe valve involves the movement of a disk or plug to control the flow of fluid through the pipeline, providing precise regulation and reliable shut-off when needed.
- Non-rotating stem with precision Acme threads and burnished finish. Double Acme for faster operation.
- Body and bonnet joint accurately machined.
- Body and bonnet castings are precision machined.
- One-piece bonnet for better alignment and fewer parts for Class 150 up to NPS 16 (DN 400).
- Flanges:
- ASME Classes: 150-300: 1⁄16" raised face
ASME Classes: 600-1500: ¼" raised face
Finish: 125-250 AARH for all valves.
- Rotating stem nut is Austenitic ductile iron Gr. D-2C renewable in line (as shown).
- When handwheel is used, thrust bearings are supplied as follows:
ASME Classes 150-300: NPS 10-12 (DN 250-300), 1 bearing (top)
NPS 14 (DN 350) and up, two bearings
ASME Classes 600-1500: NPS 6 (DN 150) and up.
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