Globe Valves

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A Globe valve is a linear motion valve primarily used for flow regulation and throttling. It gets its name from the spherical body shape, though modern designs may not always be spherical.

Below are the types of globe valves, followed by technical specifications and engineering details.

🔧 Types of Globe Valves

1. Z-Type (Straight Pattern Globe Valve)

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Description:

  • Most common design

  • Seat and disc arranged perpendicular to flow

  • S-shaped flow path inside body

Features:

  • High pressure drop

  • Excellent throttling capability

  • Used in general industrial applications

2. Y-Type Globe Valve

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Description:

  • Seat and stem angled (~45°)

  • Reduced flow resistance compared to Z-type

Features:

  • Suitable for high pressure & high temperature

  • Lower pressure drop

  • Common in steam lines

3. Angle Type Globe Valve

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Description:

  • Inlet and outlet are at 90°

  • Eliminates need for pipe elbow

Features:

  • Lower pressure loss than Z-type

  • Ideal for pulsating flow

  • Common in boiler feed systems

4. Needle Type Globe Valve

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Description:

  • Uses a slender, tapered “needle-like” disc

  • Designed for precise flow control

Features:

  • Very fine throttling capability

  • Used in instrumentation and calibration systems

  • Suitable for low flow rates

📊 Technical Specifications of Globe Valves

1. Pressure Ratings

  • Class: 150, 300, 600, 900, 1500, 2500 (ASME B16.34)

  • Working pressure: up to ~420 bar (depending on class/material)

2. Temperature Range

  • Standard: -29°C to 425°C

  • Special alloys: up to 600°C+ (steam/thermal applications)

3. Size Range

  • Typically: DN 15 (½”) to DN 600 (24”)

  • Custom designs available up to larger sizes in power plants

4. Materials of Construction

Body / Bonnet:

  • Cast Iron (low pressure)

  • Carbon Steel (WCB)

  • Stainless Steel (CF8 / CF8M)

  • Alloy steels (Cr-Mo for high temp)

Trim (disc/seat/stem):

  • Stainless Steel (SS304, SS316)

  • Stellite (wear-resistant hard facing)

  • Monel (corrosion resistance)

5. Seat Type

  • Metal to metal (high temp & pressure)

  • Soft seat (PTFE, elastomers for tight shutoff)

6. End Connections

  • Flanged (ANSI / DIN / JIS)

  • Threaded (NPT/BSP)

  • Butt weld / Socket weld

7. Flow Characteristics

  • Generally linear or modified equal percentage

  • Good throttling but higher pressure drop than gate valves

8. Leakage Class (ANSI/FCI 70-2)

  • Class II to Class VI depending on design

  • Soft seat valves achieve bubble-tight shutoff (Class VI)

9. Stem Design

  • Rising stem (most common)

  • Outside screw and yoke (OS&Y) for visibility of position

  • Backseating feature for stem seal protection

10. Actuation Types

  • Manual handwheel

  • Electric actuator

  • Pneumatic actuator

  • Hydraulic actuator

⚙️ Key Engineering Characteristics

  • ✔ Excellent throttling control

  • ✔ Reliable shut-off capability

  • ❌ High pressure drop (main disadvantage)

  • ✔ Suitable for frequent operation

  • ✔ Easy maintenance (disc and seat replaceable)

🏭 Typical Applications

  • Steam control systems

  • Cooling water regulation

  • Fuel oil systems

  • Chemical processing plants

  • Power plants (boiler systems)

  • Instrumentation flow control