| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable inoperative flowing water control and pressure adjusting control that are high in accuracy and stable, and a flowing water detecting signal to be reliably output. <P>SOLUTION: A flowing water detector 10 is provided in the middle of piping, opens a main valve 24 due to reduction of a secondary side pressure to supply pressurized water, and allows a pressure switch 40 to output a flowing water detecting signal due to the opening of the main valve 24. A main valve driving part controls supply of a primary side pressured water for a cylinder chamber 30, allows a piston 28 to stroke to open the main valve 24, and discharges the primary side pressured water from the cylinder chamber 30 to close the main valve 24. A control valve 50 is disposed in a bypass piping 36 that bypasses a primary side and a secondary side of the main valve 24. When the secondary side pressure is reduced lower than a deadline setting pressure, an inoperative flowing water structure 52 of the control valve 50 is opened to cause the secondary side pressure to recover. When the secondary side pressure is reduced furthermore, a pressure adjusting pilot structure 54 of the control valve 50 is operated to open the main valve 24. The pressure switch 40 is provided in a piping supplying a primary pressurized water into the cylinder chamber 30 and outputs the flowing water detecting signal. <P>COPYRIGHT: (C)2012,JPO&INPIT |
