BY CLOSURE MOTION
Swing & Lift Check Motion
How the closing member moves relative to the seat — the geometry behind the family name.
Choosing Swing & Lift Check Motion
Swing and lift check designs move differently as fluid opens the passage and reverse-flow conditions develop. Select the mechanism using flow conditions and permitted mounting orientation. The shape and response of the moving element influence installation choices.
What to include in the RFQ
- Provide normal and low flow, fluid density and opening-pressure conditions.
- Request allowable installation positions and pressure-loss data.
- Describe shutdown transients and obtain the appropriate closing-behavior assessment.
Selection scenario
For a vertical discharge riser, confirm that the candidate check mechanism is approved for the flow direction and orientation. Review low-flow behavior before substituting for a horizontal-line design.
Common selection mismatch
Equal nominal diameter does not establish equal opening characteristics or closure response.