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-Acting No Power Required
Direct-acting diaphragm responds to upstream pressure changes without electricity, compressed air, or external control systems.
Upstream Pressure Sustaining
Maintains minimum upstream pressure by throttling excess flow, preventing pump cavitation and tank collapse.
Slow Opening Anti-Cavitation
Plug design and guide bearings provide slow, stable opening to prevent pressure surges and cavitation damage in high-differential service.
EPDM Resilient Seat
SS316 plug with EPDM seat insert provides bubble-tight shutoff at zero differential for isolation during maintenance.
Wide Flow Turndown
Streamlined plug and large diaphragm area provide stable control from 5% to 95% of maximum flow without instability.