Valve device and method for preventing explosion propagation

摘要

Valve device comprising a housing and a closing body for closing a passage in the housing in mechanical manner, wherein the closing body is movable between an open position and a closing position; a reservoir for a flame-extinguishing substance; an injecting means configured to inject the flame-extinguishing substance into the passage in order to prevent explosion propagation resulting from a non-fully sealed closure by the closing body.