API Globe Valve

API Globe Valve is a type of linear motion valve primarily designed to start, stop, and regulate flow in pipelines. It operates with a disk (plug) moving perpendicularly to the seat, which provides precise throttling and shut-off.
It is manufactured according to API standards (mainly API 623, API 602, and API 594 depending on size/pressure).
API Globe Valve is a reliable, API-standardized valve for flow regulation and shutoff, with strong sealing and throttling capability, suitable for high-pressure, high-temperature, and frequent operation pipelines. Manual operation is simple (handwheel-driven), and maintenance mainly focuses on packing, stem, and seating surfaces.

1.Structure of API Globe Valve

Body & Bonnet – Pressure-containing parts, usually forged or cast steel.
Disc (Plug) – Moves up/down to regulate flow.
Seat – Integral or renewable, provides sealing surface.
Stem – Connects handwheel/actuator to disc.
Packing & Gland – Prevents leakage around the stem.
Bolted or Pressure Seal Bonnet – Depending on pressure class.
The flow path is S-shaped (zigzag) → this provides good throttling but with higher pressure drop compared to gate/ball valves.

2.Applicable Standards of API Globe Valve

Design & Manufacture: API 623 (Globe & Check valves), API 602 (compact forged steel valves), ASME B16.34
Testing: API 598 (valve inspection & test)
Flange/End Connection: ASME B16.5, B16.25, B16.47
Face-to-Face Dimension: ASME B16.10

3.Features of API Globe Valve

Precise flow regulation (better than gate/ball valves).
Good sealing performance with tight shut-off.
Easier to maintain seat and disc compared to gate valves.
Operates in both manual (handwheel) and automated (electric, pneumatic) modes.
Available in bolted bonnet, pressure seal, or welded bonnet designs.

4. Advantages of API Globe Valve

Excellent throttling (modulating) capability.
Shorter stroke than gate valves → faster operation.
Suitable for frequent operation (open/close cycles).
Easy seat maintenance (especially in larger sizes).

5.Maintenance of API Globe Valve

Routine checks:
Inspect packing for leakage → tighten gland bolts or replace packing.
Check stem and disc movement – ensure smooth operation, no jamming.
Regularly test shut-off sealing.
Inspect bolts and gaskets for bonnet leakage.
Common maintenance tasks:
Replace packing when stem leakage persists.
Resurface or replace seat/disc when sealing is worn.
Lubricate stem threads and yoke nut for smooth operation.
For pressure seal bonnet types, check gasket compression and integrity.

6.Applications of API Globe Valve

API Globe Valves are widely used in industries requiring flow regulation + shutoff:
Oil & Gas (wellheads, process piping)
Refinery and Petrochemical plants
Power generation (steam service, feedwater)
Water treatment plants
Chemical process pipelines
High-pressure and high-temperature systems