UB/SF-IIA1

The Deflagration Deflagration Explosion propagating at subsonic velocity (EN 1127-1:1997). -Proof Pressure/vacuum relief valve Pressure/vacuum relief valve is an umbrella term that includes pressure or vacuum relief valve as well as pressure and vacuum relief valve. and Endurance-Burning-Proof PROTEGO® UB/SF-IIA1 type diaphragm Diaphragm A diaphragm is a thin layer of material, which has a large surface area. valve is a state of the art pressure and vacuum Vacuum Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. - relief valve combining the function of a dynamic Flame Arrester Flame arrester Device fitted to the opening of an enclosure, or to the connecting pipe work of a system of enclosures, and whose intended function is to allow flow but prevent the transmission of a flame. . Worldwide this design is unique. It is primarily used within biogas plants as a device Device A device is a pipe component that influences the media flow by opening, closing, or partially shutting off the flow channel or by dividing or mixing the media flow. for flame transmission proof in- and outbreathing on tanks, containers and process engineering apparatus. The valve offers reliable protection against excess pressure and vacuum, prevents the inbreathing of air and product Product Includes equipment, protective systems, devices, components and combinations of these. losses almost up to the set pressure Set pressure Set pressure is the gauge pressure at the device inlet at which the relief device is set to start opening under service conditions. and protects against atmospheric deflagration and endurance burning Endurance burning Stabilized burning for an unlimited time. if stabilized burning Stabilized burning Steady burning of a flame stabilized at, or close to the flame arrester element. occurs.

When the pressure in the tank reaches the set pressure, the FPM-diaphragm (1) on the outer valve seat Valve seat The valve seat is a component on which the valve pallet rests when the valve is closed. ring (2) is lifted and vapours vent to the environment. The set pressure is adjusted by the liquid (glycol water mixture) column height, which is filled into the outer ring chamber (3). The overpressure Overpressure Overpressure refers to an increase in pressure in a system or vessel above the normal operating pressure. chamber is equipped with an opening (4) to keep the pressure in balance with the ambient pressure. If a vacuum builds up in the tank, it is transmitted through pressure balancing tubes into the vacuum chamber (5) (inner chamber). If the set vacuum Set vacuum Internal negative gauge pressure at which a vacuum valve first opens. , which depends on the liquid column height in the vacuum chamber, is reached the atmospheric pressure lifts the diaphragm up off the inner valve seat ring (6). Ambient air Ambient air Normal atmosphere surrounding the equipment and protection system. can now flow into the tank. The liquid column heights, which affect the set pressures and vacuum, can be checked by floating level indicators (7).

If the tank pressure exceeds the adjusted set pressure Adjusted set pressure Adjusted set pressure is the pressure at which a valve opens on a test bench. , as the case may be explosive gas/product-vapour air mixtures exit. The speed at which these mixtures exit the annular gap between the diaphragm and the outer valve seat ring while overcoming the set pressure is much faster than the flame speed. If this mixture ignites, flashback Flashback Phenomenon occurring in a flammable mixture of air and gas when the local velocity of the combustible mixture becomes less than the flame velocity, causing the flame to travel back to the point of mixture. into the tank is prevented. If the mixture flow continues, the dynamic flame arresting feature prevents flashback ignition even in the case of endurance burning.