Abstract: A valve device that greatly reduces man-hours for flow adjustment includes a valve body that defines a flow path, a valve element provided so as to be capable of opening and closing the flow path of the valve body, an operation member that operates the valve element and is moveably provided between a closed position where the valve element closes the flow path and an open position where the valve element opens the flow path, set in advance, in opening and closing directions that allow the valve element to open and close the flow path, a main actuator that moves the operation member in the opening direction, and a piezoelectric actuator for adjusting a position of the operation member positioned in the open position.

Abstract: Provided are a seal structure in which sealing performance is ensured over a long period of time even when it is used for low-temperature fluids, a sealing method, and a coupling including the seal structure. The seal structure includes an annular gasket interposed between a first member and a second member. The first member is provided on its surface facing the gasket with: a first surface located on the inner diameter side; a first annular protrusion located on the outer diameter side of the first surface; a second surface located on the outer diameter side of the first protrusion; a second annular protrusion located on the outer diameter side of the second surface and having a greater protruding amount with respect to the second surface than that of the first protrusion; and a third surface located on the outer diameter side of the second protrusion.

Abstract: Provided is a flow rate control apparatus capable of being used continuously when the apparatus is used in equipment that operates continuously, and a flow rate control method for the flow rate control apparatus. A flow rate of a fluid is controlled via any one of control valves disposed in branch passages, respectively. When replacement of the one control valve is determined to be necessary on the basis of a signal outputted from a monitoring portion of the one control valve, the one control valve performing flow rate control is closed, and another control valve disposed in another one of the branch passages, is opened, to perform flow rate control with a flow rate equivalent to that before the replacement. Furthermore, on-off valves disposed at upstream and downstream sides of the closed control valve are closed.

Abstract: A valve device includes a valve body that defines flow paths, a diaphragm provided so as to be capable of opening and closing the flow paths, an operation member provided so as to be capable of moving in opening and closing directions that open and close the flow paths by operating the diaphragm, a main actuator that applies a driving force corresponding to an operating pressure applied in the opening direction or the closing direction of the opening and closing directions with respect to the operation member, a switching mechanism capable of selectively switching a position of the operation member that regulates a degree of opening of the flow paths between a first open position and a second open position in accordance with a magnitude of the operating pressure, and regulating mechanisms capable of independently regulating the first open position and the second open position.

Abstract: A first on-off valve (2) and a second on-off valve (3) each are a two-port valve. A first passage block (5) is provided with a first on-off valve-corresponding inflow passage (11) and a first on-off valve-corresponding outflow passage (12). A second passage block (6) is provided with a second on-off valve-corresponding inflow passage (14) and a second on-off valve-corresponding outflow passage (15). The second on-off valve-corresponding outflow passage (15) is in communication with an upstream side portion of the first on-off valve-corresponding outflow passage (12) via a communicating passage (13) formed in the first passage block (5). An orifice (20) is provided between the second on-off valve-corresponding outflow passage (15) and the communicating passage (13).

Abstract: A valve device includes a valve body that defines flow paths, a diaphragm provided so as to be capable of opening and closing the flow paths, an operation member provided so as to be capable of moving in opening and closing directions that open and close the flow paths by operating the diaphragm, a main actuator that applies a driving force corresponding to an operating pressure applied in the opening direction or the closing direction of the opening and closing directions with respect to the operation member, a switching mechanism capable of selectively switching a position of the operation member that regulates a degree of opening of the flow paths between a first open position and a second open position in accordance with a magnitude of the operating pressure, and regulating mechanisms capable of independently regulating the first open position and the second open position.

Abstract: A valve element movement mechanism includes: a first valve stem having one end portion to which a first valve element to close and open an area between one of the large diameter portion and the small diameter portion is fixed; a second valve stem having one end portion to which a second valve element to close and open an area between the other of the large diameter portions and the small diameter portion is fixed; a first bellows having one end portion fixed to a first bellows flange and the other end portion fixed to the first valve element; a second bellows having one end portion fixed to a second bellows flange and the other end portion fixed to the second valve element; a frame disposed outside the main passage; and an actuator to move the frame in the directions in which valve elements are closed and opened.

Abstract: Provided is a flow rate control apparatus capable of being used continuously when the apparatus is used in equipment that operates continuously, and a flow rate control method for the flow rate control apparatus. A flow rate of a fluid is controlled via any one of control valves disposed in branch passages, respectively. When replacement of the one control valve is determined to be necessary on the basis of a signal outputted from a monitoring portion of the one control valve, the one control valve performing flow rate control is closed, and another control valve disposed in another one of the branch passages, is opened, to perform flow rate control with a flow rate equivalent to that before the replacement. Furthermore, on-off valves disposed at upstream and downstream sides of the closed control valve are closed.

Abstract: Provided are a seal structure in which sealing performance is ensured over a long period of time even when it is used for low-temperature fluids, a sealing method, and a coupling including the seal structure. The seal structure includes an annular gasket interposed between a first member and a second member. The first member is provided on its surface facing the gasket with: an annular protrusion; an inclined surface located on an inner diameter side with respect to the annular protrusion and inclined in a direction away from the gasket; and an outer-diameter-side surface located on an outer diameter side with respect to the protrusion.

Abstract: Provided are a seal structure in which sealing performance is ensured over a long period of time even when it is used for low-temperature fluids, a sealing method, and a coupling including the seal structure. The seal structure includes an annular gasket interposed between a first member and a second member. The first member is provided on its surface facing the gasket with: a first surface located on the inner diameter side; a first annular protrusion located on the outer diameter side of the first surface; a second surface located on the outer diameter side of the first protrusion; a second annular protrusion located on the outer diameter side of the second surface and having a greater protruding amount with respect to the second surface than that of the first protrusion; and a third surface located on the outer diameter side of the second protrusion.

Abstract: A valve device that greatly reduces man-hours for flow adjustment includes a valve body that defines a flow path, a valve element provided so as to be capable of opening and closing the flow path of the valve body, an operation member that operates the valve element and is moveably provided between a closed position where the valve element closes the flow path and an open position where the valve element opens the flow path, set in advance, in opening and closing directions that allow the valve element to open and close the flow path, a main actuator that moves the operation member in the opening direction, and a piezoelectric actuator for adjusting a position of the operation member positioned in the open position.

Abstract: Provided is a diaphragm valve that improves the durability of a diaphragm by focusing on the ratio of the radius of curvature of a pressing surface of a diaphragm presser to the radius of curvature of the diaphragm. SRb/SRa=0.4 to 0.6 is satisfied, wherein SRa represents the radius of curvature of a diaphragm 5 and SRb represents the radius of curvature of a pressing surface of a diaphragm presser 6.

Abstract: Provided herein is a pipe joint of a relatively small joint diameter for use under ultrahigh pressure conditions. The pipe joint includes first and second joint members having mutually communicating fluid passages; and a gasket interposed between abutting end surfaces of the first and second joint members. The first and second joint members have ring-shaped seal projections formed at the abutting end surfaces thereof. The pipe joint satisfies a coefficient F of 0.4 or less in the following formula (1). F=(D32?D12)/(D42?D22), ??Formula (1): where D1 represents the inner diameter of the first and second joint members, D2 represents the inner diameter of the gasket, D3 represents the diameter of the seal projections, and D4 represents the outer diameter of the gasket.

Abstract: A valve element movement mechanism includes: a first valve stem having one end portion to which a first valve element to close and open an area between one of the large diameter portion and the small diameter portion is fixed; a second valve stem having one end portion to which a second valve element to close and open an area between the other of the large diameter portions and the small diameter portion is fixed; a first bellows having one end portion fixed to a first bellows flange and the other end portion fixed to the first valve element; a second bellows having one end portion fixed to a second bellows flange and the other end portion fixed to the second valve element; a frame disposed outside the main passage; and an actuator to move the frame in the directions in which valve elements are closed and opened.

Abstract: A first on-off valve 2 and a second on-off valve 3 each are a two-port valve. A first passage block 5 is provided with a first on-off valve-corresponding inflow passage 11 and a first on-off valve-corresponding outflow passage 12. A second passage block 6 is provided with a second on-off valve-corresponding inflow passage 14 and a second on-off valve-corresponding outflow passage 15. The second on-off valve-corresponding outflow passage 15 is in communication with an upstream side portion of the first on-off valve-corresponding outflow passage 12 via a communicating passage 13 formed in the first passage block 5. An orifice 20 is provided between the second on-off valve-corresponding outflow passage 15 and the communicating passage 13.

Abstract: Provided is a diaphragm valve that improves the durability of a diaphragm by focusing on the ratio of the radius of curvature of a pressing surface of a diaphragm presser to the radius of curvature of the diaphragm. SRb/SRa=0.4 to 0.6 is satisfied, wherein SRa represents the radius of curvature of a diaphragm 5 and SRb represents the radius of curvature of a pressing surface of a diaphragm presser 6.

Abstract: To provide an optical pointing device capable of being provided as a device of short stature, being used integrally with an apparatus having a limited stature and a limited space, reducing cost and improving reliability. A pointing board has an X axis line pattern and a Y axis line pattern which are orthogonal to each other. When the pointing device is moved on a support base provided on a control circuit board, lights from an X and Y axis light emitting devices crosses the X and Y axis line patterns and are reflected. The reflected light is detected as an optical pulses by an X and Y axis photo-detectors. Coordinate information according to a movement direction and a movement quantity is converted into an electrical signal, and a cursor is moved on a display screen of the computer.

Abstract: To provide an optical pointing device capable of being provided as a device of short stature, being used integrally with an apparatus having a limited stature and a limited space, reducing cost and improving reliability. A pointing board has an X axis line pattern and a Y axis line pattern which are orthogonal to each other. When the pointing device is moved on a support base provided on a control circuit board, lights from an X and Y axis light emitting devices crosses the X and Y axis line patterns and are reflected. The reflected light is detected as an optical pulses by an X and Y axis photo-detectors. Coordinate information according to a movement direction and a movement quantity is converted into an electrical signal, and a cursor is moved on a display screen of the computer.

Abstract: Resin-forming material suitable for medical or dental use comprising tetramethylolmethane tri- or tetracrylate or tetramethylolmethane tri- or tetramethacrylate; and implant material suitable for medical or dental use comprising nitride of at least one member of metal selected from the group consisting of Group IVB, Group VB and Group VIB in the periodic table of elements and boron, aluminum and silicon and having Mohs' scale of hardness of at least 7.

Abstract: Resin-forming material suitable for medical or dental use comprising tetramethylolmethane tri- or tetracrylate or tetramethylolmethane tri- or tetramethacrylate; and implant material suitable for medical or dental use comprising nitride of at least one member of metal selected from the group consisting of Group IVB, Group VB and Group VIB in the periodic table of elements and boron, aluminum and silicon and having Mohs' scale of hardness of at least 7.