AUTOMATIC PRESSURE-REGULATING VALVE

• Main Author: HIRAI KOKI
• Format: Patent
• Language: English
• Published: 03.08.2006
• Subjects: CONTROLLING; PHYSICS; REGULATING; SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES

PROBLEM TO BE SOLVED: To provide an automatic pressure-regulating valve capable of realizing two-stage water drainage with a simple structure. SOLUTION: The automatic pressure-regulating valve includes a pilot pressure-regulating valve 200 in which set pressure is set by a shrinking length of a pressure set spring 21, and an automatic valve 100 by which secondary pressure is regulated to predetermined control pressure by means of a main valve 10 of which opening degree is controlled, based on the set pressure being set by the pilot pressure-regulating valve 200. The pilot pressure-regulating valve 200 includes a set pressure changing means 20 in which a pressure set spring 21 is disposed with a length being variable between a first shrinking length and a second shrinking length shorter than the above first shrinking length; and a driving section 40 for generating a driving force for changing the shrinking length of the pressure set spring 21 from the first shrinking length to the second shrinking length when the secondary pressure of the automatic valve 100 is introduced. COPYRIGHT: (C)2006,JPO&NCIPI