Quick Answer
A globe valve is a linear-motion valve used mainly for throttling and flow control. Its S-shaped body forces media to change direction, giving precise regulation at the cost of higher pressure drop. It works by moving a disc toward or away from a fixed seat, with flow typically entering below the seat.
How a Globe Valve Works
Turning the handwheel raises or lowers the stem and disc. Lowering the disc toward the seat restricts flow; raising it opens the passage. Because the disc moves along the flow axis, the opening can be set to any position, which is why globe valves are the standard choice for throttling.
Main Parts
| Part | Function |
|---|---|
| Handwheel / actuator | Moves the stem |
| Stem | Transfers linear motion |
| Bonnet | Seals the body top |
| Disc / plug | Throttles and seals |
| Seat ring | Sealing surface |
| Body | S-shaped flow passage |
Globe Valve vs. Other Valves
- Better throttling than gate or ball valves
- Higher pressure drop than gate and ball valves (5-10x in comparable service)
- Can be used for frequent operation; gate valves are not for throttling
- Common in control applications, bypass lines, and small process lines
Troubleshooting Checklist
- Valve passes when closed: lap the seat or replace the disc
- Stem leak: tighten or replace gland packing
- Hard operation: clean and lubricate stem threads
- Noise during throttling: check for cavitation; adjust opening or trim
- Always isolate and depressurize before maintenance
Frequently Asked Questions
Why use a globe valve instead of a ball valve?
For throttling. A globe valve gives precise, proportional flow control, while a ball valve is designed for on/off isolation with a nearly unrestricted full bore.
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Can a globe valve be used for on/off service?
Yes, but it is not ideal — the higher pressure drop wastes energy compared to a gate or ball valve for pure isolation.
Which direction does flow go through a globe valve?
In most designs, flow enters below the seat and exits above, keeping the packing out of the pressure path when the valve is closed. Follow the arrow on the body.
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Disclaimer: This article is provided for general educational and informational purposes only and does not constitute professional engineering advice. Valve applications vary with pressure, temperature, media, and applicable codes. Always verify specifications against the manufacturer’s data sheet and consult a qualified engineer before selecting, installing, or repairing any valve. Valve Knowledge Hub makes no warranties about the accuracy or completeness of the information on this site and assumes no liability for any use of it.