Abstract: An automatic two-stage switching valve includes a valve stem which normally closes a fluid passage by a spring force; a cylinder adopted to accommodate the valve stem; a large flow rate piston and a small flow rate piston that are provided on the valve stem and are slidably fitted in the cylinder; a large flow rate pilot pressure chamber formed in the cylinder; a small flow rate pilot pressure chamber formed in the cylinder; a stopper adopted to restrict the movement of the small flow rate piston; a pilot pressure source adopted to apply the pilot pressure simultaneously to both the large and small flow rate pilot pressure chambers; and a restrictor provided in a connection passage that connects the pilot pressure source to the large flow rate pilot pressure chamber.

Abstract: A toggle valve includes a valve stem which moves a valve body towards and away from a valve seat, an operation member separate from the valve stem, valve stem rollers which are supported by the valve stem and which have shafts whose axes extend in a direction perpendicular to the direction of the sliding movement of the valve stem without intersecting the same, a tapered surface provided on the end of the operation member adjacent to the valve stem, and intermediate rollers which are provided between the tapered surface of the operation member and the valve stem rollers to come into contact with the tapered surface and the valve stem rollers.

Abstract: A stylus pen for use as a computer input device includes a pen holder with an associated tip, a chamber defined in the pen holder and filled with a non-compressible fluid, a pressure sensor having a pressure receiving surface that detects pressure in the chamber, and a means for converting a mechanical force applied to the tip to a change in pressure of the non-compressible fluid enclosed in the chamber. In the use of the pen a mechanical force applied to the tip changes the pressure of the non-compressible fluid; and this pressure change is detected by the pressure sensor to produce a change in the output signal from the sensor usable as a computer input.

Abstract: A pneumatically-operated valve in which a valve actuator is formed of two separate parts: a driving member having a plurality of sealed pistons fixed to a piston rod in series to be operated by air pressure, and a valve operating member which comes into contact with a clean fluid and which does not have any soft substances such as O-rings which are likely to be impaired by ultrasonic cleaning. The valve facilitates the cleaning of the members during the process of manufacture and furthermore can provide a great deal of output for its size without contaminating the clean fluid during use.

Abstract: A pilot operated directional control valve having a diaphragm held between a passage block which has a feeding port, at least one loading port and at least one discharge port, and an opposed control block which has pilot pressure passages. The ports of the passage block open into the end face of the passage block adjacent to the control block through respective fluid passages. The pilot pressure is exerted on the diaphragm by the pilot pressure passages to control the fluid connection between the ports of the passage block. The fluid passages are located in a concentric arrangement.The diaphragm has a center valve portion with an annular valve portion therearound. The two valve portions can be independently controlled by the pilot pressure acting thereon to control the fluid connection between the two adjacent fluid passages.

Abstract: A pneumatically-operated valve in which a valve actuator is formed of two separate parts: a driving member having a plurality of sealed pistons fixed to a piston rod in series to be operated by air pressure, and a valve operating member which comes into contact with a clean fluid and which does not have any soft substances such as O-rings which are likely to be impaired by ultrasonic cleaning. The valve facilitates the cleaning of the members during the process of manufacture and furthermore can provide a great deal of output for its size without contaminating the clean fluid during use.

Abstract: A pilot operated directional control valve having a diaphragm held between a passage block which has a feeding port, at least one loading port and at least one discharge port, and an opposed control block which has pilot pressure passages. The ports of the passage block open into the end face of the passage block adjacent to the control block through respective fluid passages. The pilot pressure is exerted on the diaphragm by the pilot pressure passages to control the fluid connection between the ports of the passage block. The fluid passages are located in a concentric arrangement. The diaphragm has a center valve portion with an annular valve portion therearound. The two valve portions can be independently controlled by the pilot pressure acting thereon to control the fluid connection between the two adjacent fluid passages.

Abstract: A fluid directional control valve having a valve housing with valve chamber therein, an elastic seal ring for sealing the valve chamber, valve ports provided in the housing and connected to the valve chamber, a valve arm having valve bodies and swingably supported in and by the seal ring, and an actuator for actuating the valve arm, so that the valve bodies selectively open and close the valve ports in order to control the fluid connection between the valve ports, in accordance with the swing movement of the valve arm.

Abstract: A pilot operated directional control valve having a diaphragm held between a passage block which has a feeding port, at least one loading port and at least one discharge port, and an opposed control block which has pilot pressure passages. The ports of the passage block open into the end face of the passage block adjacent to the control block through respective fluid passages. The pilot pressure is exerted on the diaphragm by the pilot pressure passages to control the fluid connection between the ports of the passage block. The fluid passages are located in a concentric arrangement. The diaphragm has a center valve portion with an annular valve portion therearound. The two valve portions can be independently controlled by the pilot pressure acting thereon to control the fluid connection between the two adjacent fluid passages.

Abstract: An improved pneumatically operated valve for controlling supply of fluid to a certain apparatus adapted to be operated for an intended purpose using the thus supplied fluid. The valve includes a valve portion on the piston rod and a flow passage of fluid is normally kept in the opened state or in the closed state by means of a the valve portion under the effect of force exerted on the piston in a predetermined direction. When any abnormal fluctuation of pressure of fluid is detected, pressurized air is introduced into the interior on the casing so ast to exert its pressure on the pistion against the aforesaid force of the piston, whereby the flow passage is shifted from the opened state to the closed state or from the closed state to the opened state.