Globe Valve - its Uses and Design

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Globe Valve - its Uses and Design

• Mohsin Trading

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• Globe valve is one of the many types of valves,
  most commonly found onboard ships in places such
  as bilge suction lines. The motion is a linear
  one in this valve that governs the flow of the
  fluid. The valve, as seen from the image below,
  has a globe-shaped body that contains the valve
  seat and disc.

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• Inside this round body, is the valve seat and
  disc, set up at a right angle to the axis of the
  valve. The vertical movement of the disc, in
  other words, away from the valve seat causes a
  space between the disc and disc ring, responsible
  for opening the valve.

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• This structure of the valve provides an excellent
  throttling ability to the globe valve, which
  helps regulate the flow of the liquid. The valve
  is used not only to start and stop the flow of
  the fluid but also for regulating it. There are
  three types of designs of the globe valve

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• Z-body design
• Y-body design
• Angle design

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Z-Body Design

• The most common design of the valve, this type of
  design is most preferred for governing the flow
  of water. As the name suggests, the globe-shaped
  body has a partition that is z shaped. The stem
  and the disc move at a right angle to the body of
  the valve, aligning with the horizontally
  arranged seat. The stem passes through the bonnet
  that is attached to a wide opening at the top.

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Y-Body Design

• This type of valve design is useful in situations
  where the pressure drops, a challenge commonly
  found in globe valves. As shown in the image, the
  valve seat and stem are angled at roughly 45
  degrees to the valves axis. As a result, it
  provides a straight path for the liquid to flow,
  creating a pressure-resistant environment within
  the valve.

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• These types of valves are suited for
  high-pressure applications wherein challenges
  related to pressure drop are usual.

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Angle Design

• This design is a modification of the z shaped
  design. As seen in the diagram, the fluid flows
  through the valve body in a right-angled flow
  path. This is key in situations that involve a
  high pressure of fluids. However, in the case of
  moderate conditions, the valve functions just
  like a z shaped design.

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• Globe valves are used for both low and
  high-temperature situations. In case of low
  temperature, the globe valves are installed so
  that the pressure is under the disk. This allows
  the valve to operate with ease and prevents the
  seat and disc from erosion.

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• In case of high temperatures, the valves are
  installed so that the pressure is above the disc.
  This prevents the steam below the disc from
  contracting when it cools down and lifts the disc
  off the seat.

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