TANK SAFETY SOLUTION
About Product
The Onus Breather Valve with Flame Arrestor is a precision-engineered solution designed to provide reliable pressure and vacuum relief for blanketed and atmospheric storage tanks. Installed on vent nozzles, it safeguards tanks during filling and withdrawal by allowing them to safely inhale or exhale vapors—preventing structural damage such as bulging or buckling.
Ideal for applications involving volatile solvents or high vapor flow, this valve also integrates a flame arrestor to enhance safety in explosive atmospheres. It effectively controls pressure surges, minimizes nitrogen purge losses, and significantly reduces VOC emissions—supporting both operational efficiency and environmental compliance.
Backed by years of field-proven performance, the valve’s design has evolved to meet a wide range of pressure, vacuum, and temperature conditions. The high-precision pallet assemblies ensure tight shut-off, minimize chattering, and extend service life. Its modular construction allows for easy upgrades or replacement of dead weight-type pallets to adapt to changing process requirements.
•OFFERED IN DEADWEIGHT AND SPRING-LOADED CONFIGURATIONS
Choose between two reliable designs based on your pressure and process requirements.
•TIGHT SEAT SEALING
Engineered to maintain low leakage levels in compliance with API 527 standards.
•MINIMIZES VAPOR LOSS
Effectively controls venting to reduce unnecessary product evaporation and emissions.
•COMPLIES WITH API 2000 (7TH EDITION)
Developed according to internationally recognized standards for venting atmospheric and low-pressure storage tanks.
•INDIVIDUALLY TESTED TO API 2521 & API 527 PROTOCOLS
Each unit is factory tested to ensure safety and regulatory compliance.
•SENSOR-READY DESIGN
Easily integrates with pressure or level sensors for advanced monitoring and control.
•CORROSION-RESISTANT OPTIONS AVAILABLE
Lined and coated versions are offered for aggressive or corrosive process media.
• JACKETED MODELS FOR DIFFICULT MEDIA
Optional steam-jacketed body with drain port is ideal for handling sticky or condensable vapors.
DESIGN & SIZINGCODE: API 2000 / ISO 28300
SEATING: PTFE SOFT SEAT / PTFE SEALING
SEAT LEAKAGE CODE: API 527
SET PRESSURE / VACUUM RANGE (WEIGHT LOADED): UPTO 500 MMWC
SET PRESSURE / VACUUM RANGE (SPRING LOADED): ABOVE 500 MMWC
BODY MOC: STAINLESS STEEL (304, 316, 304L, 316L), CARBON STEEL, PFA / FEP LINED, PTFE COATING, PTFE
TRIM: SS 304L, SS 316L, HASTELLOY C, INCONEL MONEL
END CONNECTION: FLANGED (ASME, ISO, DIN, EN, JIS )
