Working Principle

The valve consists of a movable disc (or plug) and a stationary seat. When the disc is pressed onto the seat, it stops the fluid flow completely. By lifting the disc, the flow can pass through, allowing controlled fluid regulation. The perpendicular movement of the disc causes a pressure drop, which is ideal for throttling.

Types of Globe Valves

Materials Used

• Cast Iron – Suitable for low-pressure water systems
• Stainless Steel – Corrosion-resistant, ideal for chemical and steam applications
• Bronze – Excellent for marine or water service applications
• Carbon Steel – Used in high-pressure and high-temperature systems

Key Features

• Precise flow control with minimal leakage
• Durable and reliable under high pressure and temperature
• Smooth operation due to threaded stem
• Wide range of sizes and materials available

Applications

• Water treatment and distribution systems
• Steam pipelines in power plants
• Chemical and petrochemical processing
• Oil & gas pipelines and refineries
• HVAC systems for flow regulation

Installation & Maintenance Tips

• Install in the correct flow direction indicated by the arrow on the body.
• Ensure proper alignment of flanges and gaskets to avoid leakage.
• Lubricate the stem periodically for smooth operation.
• Avoid rapid opening or closing to prevent water hammer.
• Inspect seats and discs regularly for wear and replace if necessary.

Troubleshooting Common Issues

• Leakage – Check for damaged seats or gaskets and replace.
• Stiff operation – Lubricate the stem and check for corrosion.
• Excessive pressure drop – Ensure correct sizing and clean debris from the valve.

FAQs

• Q: What is the difference between a globe valve and a gate valve?
  A: Globe valves provide precise throttling control, whereas gate valves are mainly for on/off operation.
• Q: Can globe valves handle high-temperature fluids?
  A: Yes, especially if made from materials like stainless steel or carbon steel.
• Q: How often should globe valves be maintained?
  A: Periodic inspection every 6–12 months is recommended, depending on usage and fluid type.