Pressure/Vacuum Diaphragm Valve deflagration- and endurance burning-proof (UB/SF) One of the key features of the UB/SF, Pressure/Vacuum Diaphragm Valve is its exceptional endurance burning-proof performance. It is designed to withstand prolonged exposure to flames and high temperatures, making it highly reliable in critical applications where endurance burning can pose a significant risk. This durability ensures that the valve continues to provide reliable protection even in challenging industrial environments. In addition to its endurance burning-proof capabilities, the UB/SF Pressure/Vacuum Diaphragm Valve also offers excellent deflagration-proof performance. It effectively quenches flames during deflagration events, preventing the propagation of flames and subsequent explosions, and helping to mitigate the risks of accidents, injuries, and property damage. Key Features: * Excellent tightness, resulting in lowest possible product losses and environmental pollution. * Set pressure close to opening pressure for optimum pressure maintenance in the system * High flow capacity * Can be used as a protective system in areas with potentially explosive atmospheres in accordance with ATEX * Protection against atmospheric deflagrations and endurance burning for products up to explosion group IIB3 (NEC group C MESG ≥ 0.65 mm) * Minimum pressure loss of the PROTEGO® flame arrester unit * Flame arrester venting and ventilation of the pressurized chamber * Optimal frost protection * Automatic condensates drain * Monitoring of the load liquid by level indicator * Easy operation monitoring and maintenance by simply opening the hinged valve cap * Modular design enables replacement of individual FLAMEFILTER® discs and diaphragm * Particularly suitable for problematic products such as styrene, acrylates, etc.