Air Vent / Vacuum Breaker -- Automatic Water Systems
Technical Datasheet -- Float-Operated Air Release and Vacuum Breaker Valves
Document No.SV-DATA-AVV-001
RevisionA
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
Automatic air release valves and vacuum breakers for water distribution, irrigation, and process pipelines. Float-operated mechanism releases accumulated air at pipeline high points and admits air on vacuum to prevent pipeline collapse and pump cavitation. Ductile iron epoxy-coated or SS316 body with SS316 hollow float. Kinetic small-orifice or large-orifice compound designs. No external power required. AWWA C512 / EN 1074-4 compliant.
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | Air Vents & Vacuum Breakers |
| Category | Air Vents |
| Size Range | 1/2" to 4" (DN15 to DN100) |
| Pressure Rating | PN10 / PN16 / Class 150 -- up to 25 bar (365 psi) |
| End Connections | Threaded NPT / BSP (1/2" to 2"), Flanged RF per EN 1092-1 PN10/PN16 / ASME B16.5 Class 150 (1" to 4") |
| Body Material | Ductile Iron EN-GJS-500-7 (GGG50) epoxy-coated / ASTM A351 CF8M (SS316) / ASTM A216 WCB |
| Float Material | SS316 hollow float (corrosion resistant, non-porous) / Polypropylene float (standard water service) |
| Seat / Seal Material | EPDM / NBR / Viton (FPM) / PTFE soft seat |
| Cover / Bonnet Material | Ductile Iron epoxy-coated / SS316 / WCB with EPDM gasket |
| Operation | Automatic -- no external power required; float rises with water level to close valve, drops with air accumulation to open |
| Air Discharge | Continuous small-orifice air release (kinetic air valve) or large-orifice air/vacuum admission (compound air valve) |
| Back Pressure | Operates against pipeline pressure up to rated maximum -- no minimum differential required |
| Temperature Range | -10 deg C to +80 deg C (EPDM, standard water) -- up to +120 deg C (NBR) -- up to +200 deg C (Viton FPM / SS316 body) |
Materials of Construction
| Component | Material |
|---|
| Ductile Iron | EN-GJS-500-7 (GGG50) epoxy-coated body and cover (standard water distribution) |
| Stainless Steel | ASTM A351 CF8M (SS316) body, float, and cover (corrosive / seawater / high-temp service) |
| Carbon Steel | ASTM A216 WCB body and cover (high-pressure industrial) |
| Seat Options | EPDM (water / wastewater), NBR (oil / hydrocarbon), Viton FPM (chemical / high temp), PTFE (aggressive chemical) |
Testing & Inspection
| Test | Requirement |
|---|
| Testing | Hydrostatic shell test 1.5 x WP per API 598 / EN 12266-1; Seat leakage test per API 598 / EN 12266-1; Functional test -- full stroke, torque; Material certificates per EN 10204 3.1 |
| Certification | ISO 9001:2015 QMS, EN 10204 3.1 material certificates, hydrostatic and seat test reports |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | AWWA C512 Air-Release, Air/Vacuum, and Combination Air Valves, EN 1074-4 (reference) |
Notes
- Valve type (kinetic air release, air/vacuum, or compound combination) must be specified by the purchaser based on pipeline profile and operation.
- Install at all pipeline high points, at pump discharge headers, and upstream of control valves for effective air management.
- For sewage or wastewater service, specify anti-clog design with large orifice and bottom outlet to prevent debris accumulation.
- For seawater or brine service, SS316 body and float with Viton FPM seat are required; ductile iron will corrode.
- All valves are manufactured by Supreme Valves India as per our standard specifications.
