BY CLOSURE MOTION
Globe / Linear Stem Motion
How the closing member moves relative to the seat — the geometry behind the family name.
Choosing Globe / Linear Stem Motion
Linear globe motion moves a plug toward or away from its seat. The motion explains the actuator stroke and stem-thrust requirements; it does not identify the trim capacity or service. Manual globe isolation and actuated globe control share a motion class while requiring different procurement data.
What to include in the RFQ
- Request the stem stroke, closing thrust and installation direction.
- Identify isolation or regulation and the corresponding plug/seat construction.
- Confirm actuator mounting, packing and clearance for maintenance.
Selection scenario
When automating an existing globe-style valve, obtain the actual stem and load data. Select the actuator from those data rather than a nominal pipe-size chart.
Common selection mismatch
A linear actuator with sufficient stroke may still have insufficient seating thrust or an incompatible mounting interface.