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
Self-Contained Mechanical Trip
No external power, instrument air, or control system required. Fully mechanical over-pressure and under-pressure sensing and trip action.
Dual Trip Protection
Independent over-pressure and under-pressure trip mechanisms protect against both excessive pressure surges and dangerous pressure loss (e.g., upstream rupture).
Fast Closure < 1 Second
Rapid-acting spring-loaded trip mechanism achieves full shut-off within one second of trip activation, preventing uncontrolled gas release.
Manual Reset Only
Requires intentional manual intervention to re-open after trip, ensuring safety review before pipeline restart.
Full-Bore Design
Minimal pressure drop when open -- Cv approximately equal to Schedule 40 pipe bore.