Rotary Union for Vacuum Packaging Machines
Rotary vacuum packaging machines need stable vacuum and pneumatic control while the turret, sealing head, or pouch handling station rotates through each cycle.
Why rotary vacuum packaging needs separated air and vacuum passages
Who this is for: Packaging machinery OEMs, vacuum system designers, and food equipment manufacturers building rotary vacuum packaging lines.
Vacuum packaging stations often combine vacuum extraction, positive air blow-off, clamp actuation, and sealing motion in one rotating machine area.
A multi-passage rotary union keeps these circuits separated so vacuum level, air actuation, and release timing remain consistent during rotation.
Typical requirementAir and vacuum rotary transfer for rotary packaging turrets, sealing heads, and pouch handling stations.Typical Vacuum Packaging Rotary Union Specs
- Pressure: -0.06 to -0.09 MPa (vacuum) / 0.3–0.6 MPa (positive air) — low leakage critical
- RPM: 30–100 (packaging turret) — intermittent indexing
- Passages: 3–4 (vacuum + air release + clamp + seal)
- Media: vacuum + dry filtered air — food-grade for edible product lines
- Mounting: compact flange for tight turret integration
- Bore: 6–10 mm for vacuum; 4–8 mm for clamp/release air
- Seal: Glyd Ring (PTFE composite) — low leakage essential for vacuum stability
- Material: 304 SS or anodized AL for washdown and corrosion resistance
Selection Checklist
Vacuum level
Confirm target vacuum, leakage tolerance, and whether vacuum and pressure lines must be isolated.
Cycle speed
Packaging machines usually run frequent cycles, so seal life and hose support should be reviewed.
Cleaning environment
Food or washdown areas may need special material and sealing confirmation before selection.
Typical Pneumatic Rotary Union Requirements
| Machine Area | Common Function | Selection Focus | Possible Model or Configuration |
|---|---|---|---|
| Rotary pouch machine | Vacuum extraction and clamp air | Passage separation and repeatable sealing | BP-2P or BP-3P |
| Vacuum sealing head | Vacuum plus release air | Low leakage and compact mounting | 2P air/vacuum rotary union |
| Rotary bag handling station | Suction cup vacuum and blow-off | Vacuum stability and port layout | BP-3P or custom design |
Recommended Starting Points
Need help selecting a rotary union for vacuum packaging?
Send whatever you already have—a machine layout, photo, drawing, or the operating details you know. We will recommend a suitable catalog model or custom option and tell you if anything else is needed.
Vacuum Packaging Rotary Union Questions
Can a pneumatic rotary union carry vacuum?
Yes. Vacuum applications are common, but leakage tolerance, seal structure, and port layout must be confirmed.
Can one rotary union carry vacuum and compressed air?
Yes, when separate passages are used and the rotary union is selected for the required pressure and vacuum level.