BACKFLOW PREVENTION VALVE SET OF THE GAS PURGING SYSTEM AND GAS PURGING SYSTEM OF SHIP HAVING SAME

摘要

The present invention provides a set of non-return valves for a gas purging system installed on a purging line for supplying an inert gas for the purpose of purging a gas pipe, comprising: an integrated body; a first flow path formed inside the integrated body and providing a passage through which an inert gas is introduced and discharged; a second flow passage branching from the first flow passage and discharging the leaked gas; a first shut-off valve and a second shut-off valve that are sequentially installed from the upstream side of the first flow path to double open or block the first flow path; a check valve installed on the downstream side of the second shut-off valve on the first flow path to flow the inert gas in the first flow path in only one direction; and installed on the second flow path branching from the first flow path between the first shut-off valve and the second shut-off valve, and remaining between the first shut-off valve and the second shut-off valve when the first shut-off valve and the second shut-off valve are blocked A bleed valve for removing pressure, including, wherein the first shut-off valve, the second shut-off valve, the check valve and the bleed valve are integrated into one valve set through an integrated body A valve set is provided.