The Blast Valve with Prefilter Type ESVF 3603 X is a heavy duty valve that protects the interior of a shelter from blast waves caused by outside explosions. A Prefilter with an efficiency of 85% is fully integrated. The valve is normally open. If the air flow rate exceeds the nominal value by approximately 80%, the valve will close instantly. It can withstand blast waves of 3 bar (42 psi) (in-falling pressure). The valve is tested and certified to the Israeli Standard 4570 by the Civil Defence Command and the Standards Institution of Israel. The Blast Valve with Prefilter Type ESVF 3603 X protects against explosive and implosive blast waves. It is maintenance-free and temperature and corrosion resistant. The springs are manufactured from special stainless steel and all steel parts are phosphate treated and finished with a powder coating.
