PRESSURE RESPONSIVE CONTROL VALVE

摘要

PROBLEM TO BE SOLVED: To provide a pressure responsive control valve capable of certainly making the opening motion owing to its fail-safe function even if a diaphragm is broken. SOLUTION: The pressure responsive control valve consisting in an initial water-discharge pressure control valve 15 is equipped with a fail-safe mechanism which moves a spool valve 108 to the open position using a pressure water flowing out through the broken part when the diaphragm 104 is broken. The fail-safe mechanism leads the pressure water flowed out with the breakage of the diaphragm 104 to a fail-safe diaphragm chamber 126 from a communication hole 110 formed along the inner stem direction of the spool valve 108 so as to move the spool valve 108 forcedly to the open position with the displacement of the fail-safe diaphragm 14. COPYRIGHT: (C)2006,JPO&NCIPI