Abstract: A pinch valve 1 comprises a tube body 3 made of an elastic material having a flow path formed inside, a pressing part 4, a rod member 6 attached to a front end of the pressing part 4, and a coupling part 35 provided on the outer surface of the tube body 3 and coupling the rod member 6 to the tube body 3 in a transverse arrangement with respect to the tube body 3, wherein pressing or releasing the tube body 3 by the pressing part 4 through the rod member 6 makes the tube body 3 deform and opens or closes the flow path.

Abstract: A pinch valve free of outflow of fluid at the inside of a tubing to the outside of the pinch valve even if the tubing ruptures. The pinch valve 1 comprises a valve part 2, a tubing 3 inside of which a flow path is formed and accommodated in the valve part 2, a pressing part 4 pressing the tubing 3 or releasing the pressing to cause the tubing 3 to deform and open and close the flow path, and a drive part 5 driving the pressing part 4, the pinch valve further comprising a seal part sealing a fluid connection between a space near an outside surface of the tubing 3 and an outside of the pinch valve 1.

Abstract: A butterfly valve includes a seat ring fitted to an inner peripheral surface of a hollow cylindrical valve body, and a discal valve disc in which a shaft is mounted. The shaft is rotatably mounted in through-holes of the seat ring. An annular protrusion having a first tapered surface inclined at 20°-40° with respect to the valve axis is formed at the peripheral edge of each of the through holes of the seat ring. A bowl-shaped annular depression at each end of the valve shaft hole includes a second tapered surface inclined at 25°-45° with respect to the axis and engaged with a respective first tapered surface.

Abstract: A butterfly valve, in which fluid leakage inside a valve disc and from a shaft seal part between through holes of a seat ring and a stem is prevented, when the valve disc is displaced under fluid pressure with the valve closed. Without increasing the operation torque of the stem, the fluid leakage is prevented even after continuous on/off (open/close) operations over a long period of time. The butterfly valve includes the seat ring fitted to the inner peripheral surface of the hollow cylindrical valve body, the stem supported on the valve body via the through holes of the seat ring, and the discal valve disc with the stem mounted and supported in the valve shaft hole. The annular protrusion having the tapered surface with the outer periphery thereof inclined with respect to the valve axis is formed radially inward of the peripheral edge of the through holes on the inner periphery of the seat ring.

Abstract: An insulating thick film composition for forming a solder resist layer having a high degree of positional accuracy is provided, which can suppress warping and undulation of a multilayer ceramic substrate and can maintain the superior electrical characteristics thereof. The insulating thick film composition is primarily composed of a powdered ceramic having the same composition system as that of a powdered ceramic contained in a green ceramic sheet, and the mean particle diameter of the powdered ceramic of the insulating thick film composition is smaller than that of the powdered ceramic contained in the green ceramic body.

Abstract: An insulating thick film composition for forming a solder resist layer having a high degree of positional accuracy is provided, which can suppress warping and undulation of a multilayer ceramic substrate and can maintain the superior electrical characteristics thereof. The insulating thick film composition is primarily composed of a powdered ceramic having the same composition system as that of a powdered ceramic contained in a green ceramic sheet, and the mean particle diameter of the powdered ceramic of the insulating thick film composition is smaller than that of the powdered ceramic contained in the green ceramic body.