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Types and Functions of Globe Valves and Simple Troubleshooting

What is a Globe Valve?

A globe valve, is a type of forced-sealing valve used to control the flow of fluid in a pipeline. Its structure consists of a spherical or cylindrical valve body, with a movable disc and a fixed seat inside. The flow of fluid is controlled by rotating the disc to adjust the valve’s port diameter. Although commonly referred to as a ball valve, not all globe valves have a spherical structure. The sealing of a globe valve is achieved through the contact between the disc and the seat, ensuring prevention of fluid leakage. This design enables globe valves to provide reliable flow control and sealing performance.

globe valve
Source: Linkedin

The Working Principle of Globe Valves

The working principle of a globe valve is based on the seal between the valve disc (or valve plug) and the valve seat. When the valve is closed, the valve disc makes full contact with the valve seat, preventing fluid flow. When it is necessary to open the valve, the valve disc moves away from the valve seat, allowing fluid to pass through the valve. This design enables globe valves to provide reliable flow control and sealing performance.

The working principle of globe valves
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The Classification of Globe Valves

a. Angle Globe Valve: The valve body is angular in shape, suitable for compact spaces or situations requiring a change in flow direction.

b. Check Globe Valve: The valve disk and seat are designed to prevent backflow, stopping fluid from flowing in the opposite direction.

c. Straight Globe Valve: The valve body is straight-through, allowing fluid to pass directly through.

The classification of globe valves
Source: Linkedin

The Application Scenarios of Globe Valves

Water Supply Systems: Globe valves are used in pipeline systems to control and regulate the flow and pressure of water.

Water Supply Systems
Source: China Railway Fourth Engineering Bureau

Chemical Industry: In the chemical production process, globe valves are widely used to control the flow of various chemicals, solvents, and fluids.

Source: Google

Oil and Gas Industry: In the exploration, transportation, and processing of oil and natural gas, globe valves are utilized to control the flow and pressure of oil and gas.

Oil and Gas Industry
Source: Google

Steam Systems: In steam power plants, heating systems, and industrial production, globe valves are extensively used to control the flow and pressure of steam.

Steam Systems
Source: Google

Wastewater Treatment: In sewage treatment plants and sewage networks, globe valves are employed to regulate the flow and pressure of sewage, as well as to prevent backflow and contamination.

Wastewater Treatment
Source: Google

Marine and Offshore Engineering: In the liquid transport systems of ships and marine platforms, globe valves are utilized to control the flow and pressure of ship fuels, lubricants, fresh water, and seawater. Globe valves play a crucial role in the power systems, water supply systems, and liquid storage systems of vessels, ensuring the safe operation of the ship and the convenience of the crew’s life.

Marine and Offshore Engineering
Source: Google

Under What Conditions are Globe Valves Used

Globe valves are typically used in situations where there is a need to control fluid flow, regulate pressure, or prevent backflow. Here are some common scenarios where globe valves are suitable:

  • Applications requiring precise control of fluid flow.
  • Situations necessitating pressure regulation.
  • Environments where preventing backflow is essential.
  • Emergency shutdown scenarios where rapid closure of fluid flow is necessary.
  • Instances where isolating fluid flow during system maintenance or repair is required.

In summary, globe valves are suitable for a variety of conditions where precise control over fluid flow, pressure, and direction is necessary to ensure the safety, stability, and efficiency of fluid systems.

Common Faults and Troubleshooting of Globe Valves

  • Leakage:

Possible causes: Inadequate sealing between the valve seat and disc, damage, or wear on the sealing surface.

Troubleshooting: Inspect the sealing surfaces of the valve seat and disc for damage or wear, and replace the sealing components if necessary; adjust the tightening bolts of the valve to ensure proper sealing performance.

  • Stiff or Stuck Valve Movement:

Possible causes: Accumulation of deposits, rust, or damage to internal valve components, inadequate lubrication of the valve stem.

Troubleshooting: Clean the internal components of the valve, especially the disc and seat, to remove deposits or rust; apply a suitable amount of lubricating oil or grease to ensure smooth valve stem movement.

  • Air Leakage:

Possible causes: Damage to the sealing surface of the valve, wear or aging of the stem sealing components.

Troubleshooting: Check for damage to the valve sealing surface, and replace the sealing components if necessary; inspect the stem sealing components for integrity, and replace them promptly if damaged or aged.

  • Incomplete Valve Closure:

Possible causes: Bent or damaged stem, faulty valve components.

Troubleshooting: Check for stem bending or damage, and replace it promptly if necessary; inspect the valve components for integrity, and repair or replace them as needed.

  • Malfunctioning Valve Handle:

Possible causes: Loose, damaged valve handle or loose connecting bolts.

Troubleshooting: Check for looseness at the handle connection and tighten the bolts; replace the handle with a new one if damaged.

  • Valve Vibrations or Noises:

Possible causes: Rapid valve opening or closing, water hammer in the pipeline, loose internal valve components.

Troubleshooting: Adjust the valve opening or closing speed to prevent water hammer; check for loose internal valve components and tighten the bolts.

These are some common faults and troubleshooting methods for globe valves. However, actual situations may vary depending on factors such as valve type and operating environment. When conducting maintenance and repairs, always follow relevant safety regulations and operating procedures.

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