Materials of Construction (MOC)
| Component | Material Specification |
|---|---|
| Body & Bonnet | Ductile Iron (ASTM A536 / EN-GJS-400-15) |
| Stem / Spindle | SS 410 / SS 420 |
| Seat / Trim | EPDM / NBR / Bronze |
Technical Specifications
| Parameter | Specification / Standard |
|---|---|
| Manufacturing / Design Standard | EN 1171 / AWWA C509 / BS 5163 |
| Testing Standard | API 598 / EN 12266-1 |
| Pressure Rating | PN16 / PN25 |
Features & Benefits
Hinge or Gimbal Restraint
Hinge hardware limits movement to one plane; gimbal hardware permits angular movement in any plane for complex piping layouts.
Tie Rods Absorb Pressure Thrust
Tie rods transfer pressure thrust across the joint, eliminating need for massive main anchors and reducing structural load.
Large Angular Movement
Two bellows in series with hinge/gimbal restraint provide combined angular movement up to 30° in compact face-to-face length.
Multi-Ply SS321 Bellows
Hydroformed multi-ply construction provides high pressure resistance and long fatigue life in cyclic thermal service.
Internal Liner Option
SS321 flow liner protects bellows from flow-induced vibration and particulate erosion in high-velocity steam and flue gas.