globe valve
liquid filled gauge
liquid filled gauge

Globe Valve

Description

Unlike the gate valve’s flat plate, the globe valve uses a plug-like disc and a stationary ring seat.

  • Body: Features an internal baffle (wall) that forces the fluid to change direction, typically in an “S” or “Z” pattern.

  • Disc (Plug): The moving part that sits into the seat. It can be ball-shaped (for simple on/off), composition (for tight sealing), or plug-shaped (for fine throttling).

  • Stem: Connects the actuator/handwheel to the disc. The stem travel distance is much shorter than that of a gate valve.

  • Flow Direction: Globe valves are unidirectional. They must be installed with the flow entering under the disc (for standard use) or over the disc (for high-pressure steam), as indicated by an arrow on the body.

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1. Working Principle

The globe valve operates by moving the disc perpendicular to the seat:

  • Throttling: As the handwheel is turned, the disc moves up or down. Because the distance between the disc and the seat changes gradually, the user can precisely control the volume of fluid passing through.

  • Path of Flow: The fluid enters the valve, turns 90 degrees to pass through the seat opening, and then turns 90 degrees again to exit.

  • Pressure Drop: This “tortuous” path creates significant resistance, leading to a much higher pressure drop compared to gate or ball valves.

2. Primary Use

The primary use of a globe valve is Flow Regulation (Throttling).

While it can provide a tight shut-off, its design is optimized for situations where you need to:

  • Adjust flow rates frequently and accurately.

  • Operate the valve often (it has less wear and tear on the seats than a gate valve).

  • Maintain a specific pressure or temperature by modulating flow.

3. Common Applications

Globe valves are the “workhorses” of control systems in various industries:

Industry Application
Steam Systems Main steam stop valves and boiler feedwater systems where precise steam control is vital.
Cooling Water Regulating the flow of coolant to heat exchangers or engines.
Chemical Plants Precise metering of chemical additives or controlling flow to reactors.
Fuel Oil Systems Controlling fuel flow to burners or heaters.
Water Treatment Sampling lines and chemical injection points where small, controlled flows are needed.

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