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
Multi-Ply SS321 Bellows
Hydroformed multi-ply construction provides high pressure resistance and long fatigue life in cyclic thermal expansion service.
High Temperature Capability
SS321 stabilised stainless steel withstands continuous operation up to 600°C in steam, exhaust, and flue gas applications.
Internal Flow Liner
SS321 liner protects bellows convolutions from flow-induced vibration and particulate erosion in high-velocity or dirty gas streams.
Axial Movement Absorption
Designed for pure axial expansion and contraction; lateral or angular movement requires universal or gimbal configuration.
Limit Rods for Unrestrained Installation
Double-nut limit rods absorb pressure thrust and prevent over-extension when main anchors are not present.