| 摘要 |
PURPOSE:To amplify a distance of the displacement of a piezo-electric element to be transmitted to a valve unit, by providing a space, which contains a pressure transmitting medium, of large contour in a side of the piezo-electric element while of small contour in a side of the valve unit, in the case of a valve utilizing the piezo-electric element. CONSTITUTION:The main unit 1 of a valve forms a primary port 1a and a secondary port 1b, supporting a needle valve unit 2 in the bottom of a containing space S2 in the bottom of a containing space S2 of small contour filled with silicone oil L used as a pressure transmitting medium. While the main unit 1, forming a containing space S1 of larger contour successively to the containing space S2, provides a piston 4 on the upper part of the space S1, and a piezo- electric element E fixed by a supporting member 5 is adapted to the piston 4. If voltage is input from an electrode 7, the piezo-electric element E is displaced, and its displacement is transmitted to the needle valve unit 2. In this way, the valve unit 2 of this kind can be surely driven by amplifying the action of the piezo-electric element E to be transmitted to the valve unit 2 and increasing its stroke. |
