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
Dual Large and Small Orifice
Large orifice handles high-velocity air discharge during filling and air intake during draining; small orifice maintains continuous air release during normal operation.
Anti-Slam Float Design
Damped float descent and cushioned orifice closure prevent destructive water hammer when large orifice closes against incoming water.
High Air Discharge Capacity
Large orifice area matches valve nominal size, providing air discharge capacity up to 50 m/s velocity without float blow-out.
Air Intake Protection
Large orifice opens automatically under negative pressure to admit air and prevent pipeline collapse during draining or column separation events.
Ductile Iron High Strength
GGG50 ductile iron body provides superior mechanical strength and impact resistance compared to grey iron for buried and high-pressure water service.