| Category | Description |
|---|---|
| Name | Globe Valve |
| Basic Function | To start, stop, and regulate the flow of fluid (on/off and throttling service). |
| Working Principle | The flow of fluid is controlled by a movable plug (or disc) and a stationary ring seat. The plug is typically connected to a handwheel via a stem. 1. Closing: Rotating the handwheel clockwise lowers the plug onto the seat, blocking the flow path. 2. Opening: Rotating counter-clockwise raises the plug away from the seat, allowing flow. 3. Regulating (Throttling): By positioning the plug partially between open and closed, the flow area is precisely restricted, regulating the flow rate. |
| Flow Direction | The fluid flow changes direction as it passes through the valve. The standard design is flow-under-the-plug, where fluid enters from below the seat, flows upward, and exits above the seat. This design helps in easy closing but creates a high-pressure drop. |
| Key Features | Advantages: • Good shut-off capability (excellent sealing). • Precise flow regulation and throttling control. • Easy to maintain and re-pack the stem seal without removing the valve from the pipeline. • Moderate to high pressure and temperature rating. Disadvantages: • High Pressure Drop: The S-shaped flow path causes significant resistance and pressure loss. • Requires high operating force to open/close, especially in high-pressure systems. • Heavier and more expensive than gate valves of the same size. |
| Primary Applications | • Steam Systems: Boiler vents, drains, and steam supply lines. • Cooling Water Systems • Fuel Oil Systems • Chemical Feed Lines • Instrumentation Connections (for isolation) • Any application requiring frequent throttling or reliable shut-off. |
| Common Types / Designs | • Standard (T-Pattern) Globe Valve: Most common type, high pressure drop. • Angle Globe Valve: Changes flow direction by 90°, reduces the number of pipe fittings needed. • Y-Pattern (Oblique) Globe Valve: Reduces the flow resistance and pressure drop. • Bellows Seal Globe Valve: Provides a leak-proof seal for hazardous or expensive fluids. |
| Typical Standards | API 602, ASME B16.34, ANSI/FCI 70-2 (for leakage classes) |
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