Kinetic Air Valve -- Double Chamber Ductile Iron
Large-Volume Air Discharge and Intake Kinetic Valve for Water Pipelines
Document No.SV-DS-WAT-002
RevisionRev A
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
This datasheet covers double-chamber kinetic air valves in ductile iron with large and small orifices for high-volume air discharge during pipeline filling and air intake during draining or column separation.
Technical Specifications
| Parameter | Specification |
|---|
| Size Range | DN50 to DN300 (2" to 12") |
| Pressure Rating | PN10 / PN16 / Class 150 |
| Body Material | Ductile iron GGG50, epoxy coated inside and out |
| Float Material | SS304 or SS316 hollow float, leak tested |
| Large Orifice | Full bore kinetic orifice matching valve size |
| Small Orifice | 1.5 mm to 6 mm continuous air release orifice |
| Temperature Range | 0°C to +80°C (water service) |
| Operating Principle | Large orifice for filling/draining; small orifice for continuous operation |
| End Connections | Flanged BS EN 1092-1 PN10/16 or ASME B16.5 Class 150 |
| Features | Double chamber, large and small orifice, anti-slam, drain plug, epoxy coated |
| Coating | Fusion-bonded epoxy (FBE) 250 µm minimum |
Materials of Construction
| Component | Material |
|---|
| Body | GGG50 ductile iron, sand cast, machined large and small orifice chambers, epoxy coated |
| Cover | GGG50 bolted cover with gasket groove and vent outlet |
| Float | SS304 or SS316 thin-walled hollow float, leak tested, guided by SS316 cage |
| Large Orifice Plug | SS316 or bronze precision-machined kinetic orifice with anti-slam profile |
| Small Orifice Plug | SS316 precision-machined small orifice with smooth edge |
| Seat | NBR or EPDM rubber seat rings for both orifices, replaceable |
| Guide | SS316 float guide cage with anti-rotation and anti-slam damping ribs |
| Gasket | EPDM rubber gasket for body/cover joint |
| Hardware | SS316 bolts, nuts, and washers for wet environment corrosion resistance |
Testing & Inspection
| Test | Requirement |
|---|
| Test Standard | Hydrostatic shell test 1.5x PN; kinetic flow and slam test |
| Certification | CE, ISO 9001, WRAS on request |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | BS EN 1074-4 / AWWA C512 |
Notes
- Kinetic air valve must be installed at pipeline high points, pump station discharge headers, and at regular intervals (every 500 m to 1 km).
- Large orifice sizing must be verified against pipeline filling rate; undersizing causes air pocket compression and water hammer.
- For sewage force mains, specify SS316 float and anti-clogging screens on both orifices to prevent solids fouling.
- Anti-slam performance depends on float damping and orifice profile; do not modify float weight or orifice geometry in field.
- In freezing climates, install in insulated pit with drain or specify thermostatically controlled heater to prevent ice blockage.
