Direct Answer
The main parts of a globe valve include the body, bonnet, disc, stem, seat, and handwheel or actuator, all working together to control, regulate, and shut off fluid flow in industrial pipelines.
1. Valve Body
The valve body is the main pressure-containing shell.
It:
- Holds internal components
- Connects to pipeline
- Provides flow path
- Withstands pressure and temperature
2. Bonnet
The bonnet is the cover of the valve body.
It:
- Seals the top of the valve
- Supports the stem
- Allows maintenance access
- Ensures pressure containment
3. Disc (Plug)
The disc is the flow control element.
It:
- Moves up and down to regulate flow
- Contacts the seat to stop flow
- Controls throttling performance
4. Seat
The seat is the sealing surface inside the valve body.
It:
- Works with the disc to stop flow
- Ensures tight shut-off
- Can be metal or soft-seated (PTFE, rubber, etc.)
5. Stem
The stem connects the actuator to the disc.
It:
- Transmits motion from handwheel or actuator
- Moves the disc linearly
- Must resist corrosion and wear
6. Handwheel or Actuator
This is the driving mechanism.
It can be:
- Manual handwheel
- Electric actuator
- Pneumatic actuator
It controls the movement of the stem and disc.
How These Parts Work Together
- Operator turns handwheel or actuator
- Stem moves disc up or down
- Disc interacts with seat
- Flow is controlled or stopped
Industrial Applications
Globe valves are used in:
- Steam systems
- Oil and gas pipelines
- Chemical processing
- Power plants
- Cooling water systems
Conclusion
The main parts of a globe valve—body, bonnet, disc, seat, stem, and actuator—work together to provide precise flow control and reliable shut-off in industrial pipeline systems.
Frequently Asked Questions
What is the most important part of a globe valve?
The disc and seat are the most critical parts because they control flow and sealing performance.
What material is used for globe valve seats?
Seats are commonly made of stainless steel, brass, or soft materials like PTFE or rubber depending on application.
What connects the disc to the operator in a globe valve?
The stem connects the disc to the handwheel or actuator and transfers motion.
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