SPRAY SYSTEM

To provide a spray system that can suppress bacterial such as B legionella from breeding in residual water in a pressurized water supply passage to prevent unsanitary water from being sprayed from a twin-fluid spraying nozzle.SOLUTION: The spray system comprises: a hot water circulation pathway 13 through which an upstream side of a water cutoff valve 22 on a pressurized water supply pathway 12 is connected to a water supply pathway 14 at the upstream side of a water pump 3; a hot water circulation valve 24 that switches between circulation and cutoff of water into the hot water circulation pathway 13; a check valve 31 that inhibits flowing of water from the water supply pathway 14 to the hot water circulation pathway 13; a decompression valve 32 that holds differential pressure between inlet pressure and outlet pressure of the water pump 3; and a heat exchanger 5 that cools high-temperature compressed air, compressed by a compressor 2, with pressurized water. The water cutoff valve 22 on the pressurized water supply pathway 12 is brought into a closed state, the hot water circulation valve 24 on the hot water circulation pathway 13 is brought into an opened state and exhaust heat of the hot-temperature compressed air at the compressed air supply pathway 11 side is received by the pressurized water through the heat exchanger 5 and circulated through water piping, so as to sterilize bacteria by heating.SELECTED DRAWING: Figure 1 【課題】加圧水供給経路内の残水中にレジオネラ菌などの雑菌の繁殖を抑制し、２流体噴霧ノズルからの不衛生な水の噴霧を防止することができる噴霧システムを提供する。【解決手段】加圧水供給経路１２上の水遮断弁２２の上流側と、水ポンプ３の上流側の給水経路１４とを接続する温水循環経路１３と、温水循環経路１３への水の流通と遮断を切り替える温水循環弁２４と、給水経路１４から温水循環経路１３への水の流通を阻止する逆止弁３１と、水ポンプ３の吸入圧力と吐出圧力の差圧を保持する減圧弁３２と、圧縮機２により圧縮された高温圧縮空気を、加圧水により冷却する熱交換器５を備え、加圧水供給経路１２上の水遮断弁２２を閉状態、温水循環経路１３上の温水循環弁２４を開状態として、圧縮空気供給経路１１側の高温圧縮空気の排熱を、熱交換器５を通して加圧水に受熱させて、水配管内部を循環させることで加熱殺菌する。【選択図】図１