Globe Valves

A globe valve is a linear motion valve engineered to regulate, start, or stop fluid flow. Its design features a spherical body with an internal baffle that divides the valve into two halves. A movable disc seals against a stationary ring seat, ensuring efficient flow control.

Applications of Globe Valves

Globe valves are widely used for:

• Regulating fluid flow
• Throttling applications
• Isolating pipelines
• High-pressure systems
• Steam, water, and gas handling

How Globe Valves Differ from Other Valves

Unlike gate or ball valves, which primarily provide on/off control, globe valves are designed for throttling and precise flow regulation. This makes them an ideal choice for applications requiring fine adjustments.

Technical Overview

Functionality
A globe valve operates by raising or lowering a disc (plug) that moves perpendicular to the flow direction. When the disc is raised, the fluid flows; when lowered, the flow is restricted or stopped entirely.

Material Composition

• Body: Cast iron, ductile iron, carbon steel, stainless steel, bronze
• Disc/Plug: Corrosion-resistant materials like stainless steel or brass
• Seat: Metal or soft materials such as Teflon or elastomers for tight sealing

Types of Globe Valves

1. Z-Type (Straight Pattern): Standard design with inlet and outlet in a straight line.
2. Y-Type (Angle Pattern): Body angled at 45° to reduce pressure drop.
3. Angle Type: Inlet and outlet are perpendicular, suitable for pulsating flows.

Connection Types

• Flanged
• Threaded
• Butt-weld or socket-weld

Installation and Maintenance

Installation

• Align the valve with the flow direction indicated by the arrow on the valve body.
• Install upright to minimize debris accumulation.
• Ensure proper alignment to avoid strain on the valve.

Maintenance

• Regularly inspect for leaks and wear on the seat and disc.
• Remove debris from internal components.
• Lubricate the stem for smooth operation.
• Replace gaskets or seals when necessary.

Repairability
Globe valves are repairable. Components like the disc, seat, or stem can be replaced, and seals or gaskets can be renewed, extending the valve’s lifespan.

Performance Insights

Throttling Capability
Globe valves are highly effective for throttling, offering precise flow control due to their unique design.

High-Pressure Suitability
They are ideal for high-pressure systems, particularly in industries such as power generation, oil and gas, and chemical processing.

Pressure Drop Considerations
The design of globe valves results in a higher pressure drop compared to gate or ball valves due to the tortuous flow path.

Temperature Resistance
Metal-seated globe valves can withstand temperatures up to 550°C (1022°F) or higher, depending on the materials used.

Selection and Certifications

Choosing the Right Valve
Key considerations include:

• Media type and temperature
• Pressure rating
• Precision required for flow control
• Material compatibility with the fluid
• Connection type (flanged, threaded, welded)

Certifications to Consider

• ISO 9001 (Quality Management)
• API 623 (Steel Globe Valves for Refinery and Industrial Service)
• ANSI/ASME Standards
• CE Marking (European Compliance)

Automation and Lifespan

Automation Options
Globe valves can be automated using electric, pneumatic, or hydraulic actuators for remote or automated control.

Advantages

• Excellent throttling capability
• Reliable sealing for isolation
• Suitable for various pressures and temperatures

Disadvantages

• Higher pressure drop compared to other valve types
• Greater operating force required due to flow resistance
• Bulkier design compared to gate or ball valves

Lifespan
With proper maintenance, globe valves can last 10–20 years or more, depending on material quality, operating conditions, and usage frequency.