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A blast valve is a high-performance protective device designed to automatically seal air intake and exhaust openings in bunkers, shelters, defence facilities, and critical infrastructure against explosive shock waves. Under normal conditions, the valve allows continuous airflow and ventilation, but in the event of a blast or sudden pressure surge from either direction, it closes instantly to prevent hazardous pressure waves, debris, and contaminants from entering the protected area. Sigma Power Tech is a trusted manufacturer and service provider of advanced blast valves, delivering reliable blast protection solutions for defence, industrial, and critical infrastructure applications.


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