| 摘要 |
PURPOSE:To perfectly, prevent the intrusion of a pressurized fluid into a pressurized-gas feeding piping, by providing two mutually interlocked cock-devices to a changeover piping for the purpose of washing the inside of pipings, etc. by changing a high speed flow-gas and a washing liquid alternately each other. CONSTITUTION:For instance, when a pressurized solvent in a solvent supplying piping 24 flows into a gas-liquid supplying piping 26 by closing a cock 27 and opening a cock 25, since cocks are connected by an interlocking lever, etc. so that the cock 25 is opened after communicating the piping locating between the cock 27 and a chcek valve 28 to the air by a bleed valve 27a of the cock 27, even if the solvent coming from the piping 24 under pressure leaks from the check valve 28, it is discharged from the valve 27a, accordingly the intrusion of the solvent into a gas-feeding piping 27 is perfectly prevented. |
