Patent ID: 8191856

Claim:
A piezoelectric element driven metal diaphragm control valve comprising: (a) a metal diaphragm disposed so as to make contact with a valve seat, and the metal diaphragm departs from contact with the valve seat via a diaphragm presser; (b) a piezoelectric element that is elongated so as to make the metal diaphragm contact with, or depart from, the valve seat via the diaphragm presser; and (c) a conical spring mechanism disposed between the diaphragm presser and the piezoelectric element, wherein the conical spring mechanism comprises i. a diaphragm presser holder having a lower end portion fitted with the diaphragm presser, and the diaphragm presser holder is provided with a housing space having an open end top formed on an upper end portion of the diaphragm presser holder; ii. a plurality of conical springs placed in the housing space of the diaphragm presser holder; iii. a ball rest placed on an upper face of an uppermost conical spring of the plurality of conical springs, and the ball rest is placed under the piezoelectric element so as to transmit an elongation of the piezoelectric element to the uppermost conical spring; and iv. a spring adjustment nut is screwed to the diaphragm presser holder in order to adjust repulsion force of the uppermost conical spring and so as to prevent the ball rest and the plurality of conical springs from coming out of position.