Abstract: A pressure gauge includes a pressure measurement-display portion (11) for measuring a pressure and displaying the pressure by a pointer, a fitting portion (21) extending from the pressure measurement-display portion and having a pressure detection passage (22) formed therein, and an orifice member (60) arranged in the pressure detection passage and having an orifice (62) formed therein. This pressure gauge prevents breakage of an internal mechanism of the pressure gauge owing to a pressure change phenomenon. Incidentally, an orifice may be formed at a part of the pressure detection passage in place of the orifice member. A pressure gauge assembly (1) includes a pressure gauge (10) having a fitting portion having a pressure detection passage formed therein, and a joint (30, 40) for connecting the fitting portion of the pressure gauge to a conduit line, wherein an orifice (49) is formed at a part of an internal passage of the joint.

Abstract: A loosening prevention device (1) for a plug includes: a first sleeve (11) engaged with and surrounding a first plug (70) attached to a lid of a liquid tank (60); a second sleeve (21) engaged with and surrounding a second plug (80) attached to the lid; and a connection means (24) for connecting and fixing the first sleeve and the second sleeve with each other. At least one flat surface (75, 85) is formed on an outer circumferential surface (74, 84) of both or either one of the first plug and the second plug, and at least one flat surface (12, 22) in surface contact with the flat surface of both or either one of the first plug and the second plug is formed on an inner circumferential surface of both or either one of the first sleeve and the second sleeve. With this arrangement, a plug for supplying pressurized-gas and a plug for discharging liquid can be firmly held.

Abstract: A fluid-transfer coupling device includes a cylindrical housing (1), a cylindrical slider (25), which contains a valve sleeve (15) accommodating a valve (16) to be opened by pressure and which can slide in the cylindrical housing and plug supporting means (60), which supports a plug (70) on condition of being drawn up to an advanced end in the valve sleeve by the movement of the slider. With this constitution, even when using a coupling device having a relatively-large diameter, it is possible to supply fluid stably. Further the plug supporting means is arranged in front of the forward end of the slider. Additionally, the plug supporting means is provided with an improper connection preventing mechanism (68, 69a to 69d, 77) for preventing other plugs, except for a specified plug from being connected.

Abstract: A compact pressure switch that causes little error in the operating point of the switch and that has resistance to dust, water, and chemical solutions is provided. The pressure switch includes a housing (2) formed of a resin having chemical solution resistance, a pressure sensor (3) that detects the pressure of a fluid, a separator (4) that is formed of a resin having chemical solution resistance and that prevents the fluid from coming into contact with the pressure sensor (3), and a circuit unit (5) that outputs on and off signals based on the output of the pressure sensor (3). At least the pressure sensor (3) and the circuit unit (5) are disposed in a sealed space (S) formed by the housing (2) and the separator (4).

Abstract: A flow rate regulation valve comprising a housing (11) formed with a valve hole (13), a needle valve (60) moved relative to the valve seat (16) in the housing, and a flow rate adjust knob (40) mounted at the proximal end of the needle valve extending from the housing, wherein the needle valve is moved relative to the valve seat by rotating the flow rate adjust knob thereby regulating the flow rate of fluid flowing through the valve hole, the flow rate regulation valve further comprising a knob fixing means (35) for stopping the rotation of the flow rate adjust knob. As a result, the flow rate is prevented from being changed accidentally by a user or the like. Further, the value may have a seal adjust means (20) adjusting the sealed state between the housing and the needle valve. The seal adjust means may be formed as a part of the housing, and may be fixed to the housing by a fixing pin (15).

Abstract: The present invention provides a flow-rate control valve that allows for manufacturing cost reduction and has a compact size with improved ease of maintenance. The flow-rate control valve includes a lower casing provided with a channel that leads a liquid and a fluid and with a valve seat, a valve body that controls, in conjunction with the valve seat, the flow rate of the liquid and the fluid that pass through the channel, a reciprocating drive part that moves the valve body closer to or away from the valve seat, and an upper casing that houses the reciprocating drive part.

Abstract: A fluid-transfer coupling device includes a cylindrical housing (1), a cylindrical slider (25), which contains a valve sleeve (15) accommodating a valve (16) to be opened by pressure and which can slide in the cylindrical housing and plug supporting means (60), which supports a plug (70) on condition of being drawn up to an advanced end in the valve sleeve by the movement of the slider. With this constitution, even when using a coupling device having a relatively-large diameter, it is possible to supply fluid stably. Further the plug supporting means is arranged in front of the forward end of the slider. Additionally, the plug supporting means is provided with an improper connection preventing mechanism (68, 69a to 69d, 77) for preventing other plugs, except for a specified plug from being connected.

Abstract: Provided are a flow meter and a flow-rate control system using the same that is capable of measuring a flow rate in a minute flow-rate region with excellent measurement accuracy by preventing or suppressing the generation of bubbles and in which accumulation of the fluid and the bubbles is less likely to occur.

Abstract: A liquid tank connector for preventing leakage of contents in a liquid tank when removing a socket from a plug fixed to the liquid tank is provided. The liquid tank connector which includes a plug to be fixed to a liquid tank where liquid is stored, a socket which is able to be connected and disconnected with respect to the plug, and a sleeve for releasing a connected state between the plug and the socket by a relative movement with respect to the socket, and in which a liquid flow channels and gas flow channels are formed in a liquid deliverable state in which the plug and the socket are connected, and which includes: a cock which forms a gas flow channel in the liquid deliverable state, and the relative movement of the sleeve is controlled by the position of the cock in the liquid deliverable state.

Abstract: A pressure gauge includes a pressure measurement-display portion (11) for measuring a pressure and displaying the pressure by a pointer, a fitting portion (21) extending from the pressure measurement-display portion and having a pressure detection passage (22) formed therein, and an orifice member (60) arranged in the pressure detection passage and having an orifice (62) formed therein. This pressure gauge prevents breakage of an internal mechanism of the pressure gauge owing to a pressure change phenomenon. Incidentally, an orifice may be formed at a part of the pressure detection passage in place of the orifice member. A pressure gauge assembly (1) includes a pressure gauge (10) having a fitting portion having a pressure detection passage formed therein, and a joint (30, 40) for connecting the fitting portion of the pressure gauge to a conduit line, wherein an orifice (49) is formed at a part of an internal passage of the joint.

Abstract: A tube connector that allows for a secure connection between a plug and a socket is provided. An accommodation space is provided such that, when the plug is inserted into an insertion hole of the socket while a sleeve is lifted upward to a base-end position, if a ball rolls on an outer periphery of the plug so as to come into abutment with a projection, the accommodation space entirely accommodates the ball at a side adjacent to the socket relative to the outer periphery of the plug.

Abstract: In a fluid-transfer coupling device (5) that connects a plug (70) and a socket (10) to each other to communicate respective flow paths in the socket and the plug with each other, the plug includes, at least, an inner spacer (74) having an inner passage (78) formed to allow a passage of fluid, a plug collar (73) covering the outer circumferential surface of the inner spacer and a flange (75) formed on a proximal end of the plug to connect the plug to a conduit. The plug collar and the flange are made of metal. Consequently, even if the flow rate of the fluid is large, the plug can be firmly supported in the device. The inner spacer is made of a resinous material. In this connection, at least one portion of an outer circumferential portion of the plug may be formed of metal.

Abstract: Provided are an orifice member, and a differential-pressure flow meter and a flow-regulating device using the orifice member, that allow purging to be carried out easily when changing the fluid to be circulated, that are less likely to cause contamination and leaching of impurities to the circulated fluid, and that can be easily produced. The flow-regulating device includes a first pressure-measuring device (object to be connected to) that is connected to one end of the orifice member, and a second pressure-measuring device (object to be connected to) that is connected to the other end of the orifice member, and a flow-regulating valve that is connected to the downstream side of the differential-pressure flow meter, which includes the above-mentioned units.

Abstract: A socket for a fluid-transfer coupling device (5) that communicates a flow path in the socket with a flow path in a plug (70) since the socket (10) and the plug are connected to each other, includes a mount panel attachment (17) arranged in the vicinity of an entry (19) of the socket allowing the plug to be inserted, and attaching the socket to a mount panel (18) and a support (35) arranged in a different position from the entry and supporting the socket. Consequently, the socket can be stably supported on the mount panel even if the flow rate of fluid is large. It is preferable that at least one part of the socket is constructed in a spigot-and-socket manner.

Abstract: A loosening prevention device (1) for a plug includes: a first sleeve (11) engaged with and surrounding a first plug (70) attached to a lid of a liquid tank (60); a second sleeve (21) engaged with and surrounding a second plug (80) attached to the lid; and a connection means (24) for connecting and fixing the first sleeve and the second sleeve with each other. At least one flat surface (75, 85) is formed on an outer circumferential surface (74, 84) of both or either one of the first plug and the second plug, and at least one flat surface (12, 22) in surface contact with the flat surface of both or either one of the first plug and the second plug is formed on an inner circumferential surface of both or either one of the first sleeve and the second sleeve. With this arrangement, a plug for supplying pressurized-gas and a plug for discharging liquid can be firmly held.

Abstract: A highly versatile flow-rate controller that is easy to handle and a regulator unit and a valve unit used for the same are provided. The flow-rate controller includes a regulator unit having a regulator and a first pressure sensor, a valve unit having a second pressure sensor and a flow-rate control valve, and an orifice unit that is connected to the regulator unit and the valve unit in a detachable manner and that has a fluid channel and an orifice that connect to the regulator unit and the valve unit.

Abstract: A connector structure that can minimize the amount of liquid remaining in a container is provided. In a connector structure that is attached to an opening 2 of a container 1 and including a siphon tube 11 for extracting a liquid inside the container 1 with pressure of gas introduced into the container 1, a gas channel 12 for introducing the gas and a liquid channel 13 for extracting the liquid are formed by joining together a plug 40 and a socket 20, and an axis Cs of the siphon tube 11 and an axis Cv of the container 1 have a predetermined inclination angle ? therebetween.

Abstract: Provided are a flow meter and a flow-rate control system using the same that is capable of measuring a flow rate in a minute flow-rate region with excellent measurement accuracy by preventing or suppressing the generation of bubbles and in which accumulation of the fluid and the bubbles is less likely to occur.

Abstract: An object is to provide a flow control valve that is capable of reducing or eliminating backlash generated between a male threaded portion and a female threaded portion engaged with the male threaded portion and preventing or eliminating hysteresis in the flow level. The flow control valve includes a body having a fluid inlet and a fluid outlet, a cover attachable to the body, a motor disposed in a space defined by the body and the cover, a valving element connected to a rotary shaft of the motor with a screw member, and an urging member that urges the valving element toward the motor side or toward the side opposite to the motor.

Abstract: A compact pressure switch that causes little error in the operating point of the switch and that has resistance to dust, water, and chemical solutions is provided. The pressure switch includes a housing (2) formed of a resin having chemical solution resistance, a pressure sensor (3) that detects the pressure of a fluid, a separator (4) that is formed of a resin having chemical solution resistance and that prevents the fluid from coming into contact with the pressure sensor (3), and a circuit unit (5) that outputs on and off signals based on the output of the pressure sensor (3). At least the pressure sensor (3) and the circuit unit (5) are disposed in a sealed space (S) formed by the housing (2) and the separator (4).