Abstract:
The invention concerns an apparatus for gravimetric dosing of powder material from a container. The apparatus comprises a container (1) and a valve located in a flow channel of material flowing from the discharge aperture of the container, said valve being provided for opening and closing the flow channel. The valve comprises a flow aperture (2) and a shutter movable with a sliding tolerance back and forth in the aperture. The shutter is a plug (3) movable in the perpendicular direction with respect to the plane of the aperture, having a length in the flow direction of the valve and having an envelope surface forming a sliding surface equivalent to the periphery of the flow aperture (2). In the sliding surface there is at least one groove (4) expanding in the flow direction of the valve.
Abstract:
The present invention relates to flow restrictors suitable for the controlled transfer of fluid from a first compartment to a second compartment. More specifically, the invention relates to a safety arrangement reducing the risks associated with diminished flow resistance through the flow restrictor. In a first aspect the present invention provides a flow restrictor comprising a flow-restricting channel formed between at least a first member and a second member arranged in contact with each other, the flow channel being arranged to form at least one generally U-formed portion with a pair of opposed first and second channel portions, and with a safety channel arranged between the opposed first and second channel portions. The safety channel provides a fluid communication with an exterior space relative to the flow restrictor.
Abstract:
An orifice for use in pressure type flow rate control unit which can be manufactured easily and inexpensively, and which has a linear relationship between pressure P1 upstream of the orifice and the flow rate over a wide range of pressure ratio P2/P1 (where P1 is the pressure upstream of the orifice and P2 is the pressure downstream of same), with the flow rate characteristic relationship among a plurality of orifices being easily adjustable. More specifically, the orifice has a structure comprising a tapered inlet section (1) wherein one open end of a bottom hole (6) bored into a main body member (D) is cut into a shape like the mouthpiece of a trumpet, and a short drawn parallel part (2) continuing therefrom; and a short expanded tapered section (3) formed by expanding the diameter of the other open end of the bottom hole (6) and continuing from the drawn parallel part (2), and an expanded parallel part (4) continuing therefrom.
Abstract:
A device for controlling the flow in a pipe system, such as a sewerage system, comprising a vortex chamber (40) with an inlet opening and an outlet opening (43), an inlet gate (10) arranged outside the inlet opening being displaceable more or less downwards in front of the inlet opening. When the inlet gate (11) is in a position in which it obstructs part of the inlet opening the flowing liquid amount may unimpededly pass into the vortex chamber, provided the upstream liquid level is lower than the lower edge of the gate (10). If the upstream level is higher than the lower edge of the inlet gate, part of the intake flowage will be effected from above and downwards round the lower edge. The inlet gate is shaped so that the liquid amount coming from above initiates a contraction of the influx liquid jet, thereby accelerating the rate thereof and the braking effect of the chamber increases. This entails that the device according to the invention may be designed with a larger inlet opening to the chamber, thereby increasing the capacity of the device at small upstream pressure and reducing the risk of occlusion.
Abstract:
An apparatus for bi-directionally regulating flow of an actuation fluid includes a conduit and a plurality of baffles. The conduit includes a conduit flow channel that extends longitudinally along a centerline between a first conduit end and a second conduit end. The baffles are sequentially non-coaxially arranged in the conduit. Each of the baffles includes a baffle flow channel that laterally tapers and extends, in a longitudinal direction towards the second conduit end, from a first baffle end to a baffle orifice at a second baffle end. The first baffle end is connected to the conduit, and extends laterally across the conduit flow channel.
Abstract:
A flow restrictor is provided to reduce pressure in the flow of a fluid, such as a hydrocarbon-based fuel. The flow restrictor takes the form of a capillary that is void of any abrupt flow disruptions. The flow restrictor may be used in place of an orifice and provides the advantage that it has a larger diameter than an orifice of similar function. Precipitation is less likely to form on the restrictor and any precipitation is less likely to have an adverse affect on performance.
Abstract:
A distal rate control device, which can be conveniently interposed between a fluid supply line and fluid delivery line for precisely controlling the rate of fluid flow toward the delivery line. The device includes a readily adjustable flow rate control device having a novel flow control plate that can be placed in fluid communication with the fluid supply line and with the fluid delivery line. The flow control plate is provided with a plurality of elongated fluidic flow control channels that are in communication with a rate selector member that is rotatably carried by the device housing. Rotation of the rate selector member places a selected one of the flow control channels in communication with the fluid delivery line.
Abstract:
A flow system (1) comprising a first part (2) and a second part (3), the parts (2, 3) being made from materials having different coefficients of thermal expansion. The first (2) and second (3) parts are positioned relatively to each other in such a way that when the ambient temperature changes corresponding changes are caused in a flow channel (4) formed in the first part (2), thereby changing the flow resistance of the flow channel (4). Thereby a change in flow resistance caused by a change in viscosity of a fluid being transported by the flow system (1) can be counteracted. The resulting flow resistance of the flow system (1) is thereby at least substantially independent of the ambient temperature. Furthermore, a micro fluidic system comprising the flow system (1). The micro fluidic system may be or form part of a medical device, a fluid analysis system, e.g. a device for measuring blood glucose levels of blood samples, or an infusion device.
Abstract:
A regulator to regulate pressure of high-pressure gas discharged from a gas bombe is disclosed. When the spout (la) of a gas bombe (1) fastened to a bombe connection part (52) of a regulator housing (50) is manipulated, gas from the bombe passes through a gas supply valve (60), a pressure regulation valve (70) and a flow control valve (80). The pressure regulation valve (70) opens or closes the gas supply valve (60) according to the pressure of the gas, thus regulating the pressure of the gas in the housing. The regulated gas may be discharged through an upper nozzle (54) or a lower nozzle (56). A retainer ring (90) to support the pressure regulation valve and to prevent contact between the two valves (70, 80) is placed in a step space (80a) of the flow control valve. Thus, the pressure regulation valve does not press the flow control valve.
Abstract:
The invention provides a flow regulator for controlled gravity flow of fluid comprising: - a flow control reservoir adapted to discharge the required volume of fluid and comprising at least one inlet for entry of the fluid into the reservoir; - at least one siphon discharge operatively connected to the flow control reservoir and adapted to control the flow rate of the fluid from the reservoir. The flow regulator is particularly suitable for the provision of control over the flow of water in water purification systems, especially gravity flow water purification devices for the purification of water for domestic consumption.