S-Tec Corporation

Hiroshi Ohsasa

Tetsuo Shimizu

Kiyoharu Tujimura

Michinori Iwamoto

Akira Nakazawa

Takashi Shirai

An normally closed-type fluid control valve, having a guide standing through a counter member on the side of an upper surface of a valve base is provided with a cylindrical member having an engaging portion at its lower end and movable up and down on an inner the side thereof. Cylindrical member is provided with an actuator therewithin so that the actuator may be held by the cylindrical member. A support member 051452225 is fixed in position by means of the counter member and the guide is inserted into a hole opened at a position below a lower end portion of the actuator. A lower end side of the actuator is engaged with an upper surface of the support member and a pressing spring is interposed between the support member and the engaging portion of the cylindrical member to press a valve body against a valve seat formed in the valve base, whereby closing the said valve so that the pressing spring may be compressed by an output of the actuator during the time when the actuator is acting to separate the valve body from the valve seat, whereby opening the valve.

Normally closed-type fluid control valve

A control valve, in which a valve body opening and closing a valve mouth is driven by a strain force of a piezostack, characterized in that an upper fixed portion of said piezostack is supported by a ring-like tapered surface or a spherical surface and a lower movable portion of the piezostack is combined with a valve body through a spherical bearing. The strain output can be surely transmitted to said valve body by holding the piezostack so that no movement other than a strain resulting from the application of voltage may be produced.

Control valve

A control valve in which a surface of a valve seat closer to a valve body is formed so as to be flat. A valve head corresponding to an annularly formed fluid-communication passage is provided with an annular inner convex projection and an annular outer convex projection. These projections engage with the flat surface of the valve seat on the inner side and the outer side of the fluid-communicating passage, respectively. The valve head is provided with a communicating passage for providing communication between a valve body-driving portion side thereof and a valve seat surface side containing the inner convex projection.

Growing community of inventors

Miyanohigashi, Japan

Hiroshi Ohsasa