Model KSBBFI-A /BSFI-A, which is used for the protector of fluid storage tank, is composed of one body with the functions of pressure relief, vacuum relief, and to block the external repellent fire. This is consist of the flame arrester which blocks the external repellent fire, the function of discharge the overpressure developed during intake air to the storage tank, and the function of intake the air under the constant pressure during unloading. And this is the safe valve to prevent the many kinds of storage tank from the deflation (vacuum), inflation ( pressure ) and fire. The standard flame cell is suitable for NEC group D or IEC IIA gases, Cells for other gas groups are available as additional extras. The KSBBFI-A is a weighted pallet model designed to handle pressure and vacuum with a minimum pressure of +/-20mmW.C and a maximum setting of + 700/-430 mmW.C The KSBSFI-A is a spring loaded model designed to handle pressure and vacuum with a minimum pressure of +/-700mmW.C and a maximum setting of +/- 9,000mmW.C. Body materials are available in Aluminium, Carbon Steel, 304SS and 316SS with various trims to suit individual requirements. Sizes range from 50mm through to 350mm with ANSI 150lb flanges as standard. (Different connections available on request).