Breather Valve / Pressure Vacuum Relief Vent -- API 2000
Technical Datasheet -- Pressure Vacuum Relief Vents for Atmospheric Storage Tanks
Document No.SV-DATA-BVV-001
RevisionA
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
Pressure vacuum relief vents (breather valves) for atmospheric and low-pressure storage tanks. Weight-loaded, spring-loaded, or pilot-operated pallet opens at set pressure to vent excess pressure or admit air on vacuum, preventing tank rupture and implosion. Aluminium, carbon steel, SS316, or ductile iron body. PTFE/RPTFE or graphite seat facing. Flow capacity rated per API 2000 / EN ISO 28300. ATEX / IECEx certified for explosive atmospheres. In-situ set pressure verification without removal.
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | Breather Valves |
| Category | Safety & Relief Valves |
| Size Range | 2" to 12" (DN50 to DN300) |
| Pressure Setting | Pressure: +2.5 mbar to +69 mbar (+1 inch WG to +28 inch WG) -- Vacuum: -2.5 mbar to -69 mbar (-1 inch WG to -28 inch WG) -- higher settings on request |
| End Connections | Flanged RF per EN 1092-1 PN10/PN16 / ASME B16.5 Class 150, Threaded NPT / BSP (2" to 4"), Tri-clamp (sanitary, on request) |
| Body / Housing Material | Aluminium alloy (lightweight, standard for atmospheric tanks) / Carbon Steel ASTM A216 WCB epoxy-coated / SS316 ASTM A351 CF8M / Ductile Iron EN-GJS-500-7 epoxy-coated |
| Pallet / Seat Material | SS316 with PTFE or RPTFE seat facing / Aluminium with PTFE facing (lightweight) |
| Guide Material | SS316 guide rods and bushings / PTFE-lined guides (low friction) |
| Gasket Material | PTFE / RPTFE / Graphite with SS316 spiral wound (high temp) |
| Set Pressure Type | Weight-loaded (deadweight pallet, simplest, most reliable) / Spring-loaded (compact, higher settings, less sensitive to vibration) / Pilot-operated (tightest shutoff, highest capacity, remote sensing) |
| Flow Capacity | Rated per API 2000 / EN ISO 28300 at 100% overpressure (or 10% overpressure for pilot-operated) |
| Leakage | Near-zero leakage below set pressure (weight-loaded: bubble-tight; spring-loaded: < 1% of rated capacity at 90% set pressure; pilot-operated: < 0.5%) |
| Temperature Range | -40 deg C to +60 deg C (aluminium body) -- up to +150 deg C (CS/SS316 body with PTFE seat) -- up to +300 deg C (CS/SS316 body with graphite seat, on request) |
Materials of Construction
| Component | Material |
|---|
| Aluminium Alloy | Aluminium alloy body and pallet (lightweight, standard for atmospheric tanks, non-corrosive hydrocarbons) |
| Carbon Steel | ASTM A216 WCB epoxy-coated body and housing (industrial, higher pressure settings) |
| Stainless Steel | ASTM A351 CF8M (SS316) body, pallet, and guide (corrosive / marine / food-grade service) |
| Ductile Iron | EN-GJS-500-7 (GGG50) epoxy-coated body (economical water / wastewater tanks) |
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 | API 2000 Venting Atmospheric and Low-Pressure Storage Tanks, EN ISO 28300 Venting of Atmospheric and Low-Pressure Storage Tanks, ATEX Directive 2014/34/EU |
Notes
- Pressure set point, vacuum set point, tank design pressure/vacuum, and required flow capacity (normal venting + emergency venting) must be specified by the purchaser for correct valve sizing and pallet/spring selection.
- For VOC emission control and expensive product storage, pilot-operated design is strongly recommended for near-zero leakage below set pressure.
- For cryogenic or low-temperature service (below -40 deg C), SS316 body with low-temperature gasket material is required; aluminium is not suitable.
- Install on tank roof at highest point with adequate clearance for pallet lift and without obstruction from insulation, walkways, or adjacent equipment.
- All valves are manufactured by Supreme Valves India as per our standard specifications.
