TANK SAFETY SOLUTION
About Product
The Onus Breather Valve with Flame Arrestor is a precision-engineered pressure and vacuum relief valve, developed for blanketed and atmospheric storage vessels where maintaining controlled internal pressure is critical. Ideal for handling volatile solvents or high vapor flow applications, the Breather Valve with Flame Arrestor protects against pressure or vacuum surges that can lead to tank deformation, product loss, or hazardous emissions.
Installed on vent nozzles, this valve ensures reliable breathing during tank filling and withdrawal, allowing tanks to safely inhale or exhale vapor without exceeding structural limits. The valve is also highly effective in minimizing nitrogen purge loss and reducing VOC emissions, supporting both process efficiency and environmental compliance.
Over years of field application, the design has evolved to accommodate a wide range of pressure, vacuum, and temperature demands. The high-precision pallet assemblies ensure tight shutoff, reduce chattering, and enhance operational life. Modular by design, dead weight pallet systems can be easily upgraded or adjusted to match changing process conditions.
•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 )
