30results about How to "Accurate flow regulation" patented technology

The disclosure describes a system to provide a steady supply of lumber pieces to a board separating device and insure the correct positioning of each lumber piece, at the proper time, thus allowing the separating device to function at a substantially higher rate than hitherto possible with previously known infeeding arrangements.

A needle valve that adjusts the flow of liquid fluid and an open/close valve that makes it possible to fully close a flow path of the liquid fluid are accommodated inside a casing of a flow adjusting valve. The needle valve is provided with a reciprocating movement section that adjusts the flow of the liquid fluid by moving a needle valve piece toward and away from the valve seat. The open/close valve is provided with an opening/closing section that utilizes a basal outer surface of the needle valve piece facing the valve seat as a fully-closing valve piece and that reciprocatingly moves the fully-closing valve piece, independently of the reciprocating movement section, between a closed position, where the fully-closing valve piece is in close contact with the valve seat, and an open position, where the fully-closing valve piece is moved away from the valve seat.

Control device for a stopper-rod to regulate the outflow of liquid metal through a calibrated hole of a pouring receptacle comprising motor means, suitable to operate lifting and lowering means (2) of the stopper (4) by means of first driving means (7) and second driving means (14, 14″), the latter being suitable to convert a rotating motion into a translational motion, wherein the second driving means are flexible longitudinal elements and are fixed at a first end thereof to lifting and lowering means and a second end thereof to an anchor element (9), integral with the first means.

The present invention relates to a linear flow regulating apparatus for intravenous infusion, and more particularly, to a flow regulating apparatus which is used in an infusion set for intravenous infusion to regulate the flow rate of a solution injected into a body. To eliminate the difficulties caused by the nonlinearity of conventional flow regulating apparatuses, which regulate flow rates by pressing a solution flow tube to adjust the flow passage area, the linear flow regulating apparatus has a control unit to be put in or taken out along the width of a flow channel unit through which the solution flows when the height and length of the flow channel unit are fixed, and is capable of linearly regulating the flow rate by varying the flow passage area of the flow channel unit by adjusting the width of a flow channel unit.

An improved nib for writing with ink on media that comprises a tube having a proximal opening, a slanted distal opening, an interior wall and an exterior wall, an exposed writing tip at a distal end of the nib, wherein the tip has a groove extending from the tip along at least a portion of the interior wall, and a slit extending from the tip along a part of the nib, wherein the tip is made of a ceramic material.

The invention relates to a ball valve core with a flow rate regulating function. The ball valve core comprises a spherical valve core body and one or more throttle orifice plates, wherein the valve core body is made of a whole piece of Stellite3; the hardness of the valve core body is higher than HRC 60; a valve rod connector is arranged at the top end of the valve core body; a circular medium through hole is formed in the middle of the valve core body; a spherical regulator pair provided with a plurality of small orifices is arranged on one side of the circular medium through hole; and the throttle orifice plates are arranged in the circular medium through hole. By adoption of the ball valve core provided by the invention, the defect that in the prior art, a valve core for a common ball valve and a V-shaped valve core for a ball valve are low in regulating precision, easy to erode and damage under the working condition of high differential pressure, and short in service life can be overcome; through the design that the ball valve core is equipped with spherical regulator pair and the throttle orifice plates as well as the spherical regulator pair is provided with the small throttle orifices, the flow rate of a medium can be highly precisely regulated and controlled in the rotation starting or stopping process of the valve core body, and the ball valve core is particularly applicable to the working condition of high differential pressure; the valve core body is made of a whole piece of Stellite3, so that the high hardness can be achieved and the abrasion resistance can be improved; and the ball valve core has the advantages of being simple in structure, high in regulating precision, long in service life and high in reliability.

The invention discloses a V-shaped ball valve with a valve element suitable for a large-temperature-difference flow system. A valve element is arranged in a valve body; a main body of the valve element is a hemispherical shell; a valve hole is formed in the hemispherical shell; the inner surface of the valve hole comprises an arc-shaped surface; the two circumferential side edges of the arc-shapedsurface are connected with one side edges of two symmetrical and parallel rectangular planes; an arc surface is connected between the other side edges of the two rectangular planes; the valve hole forms a medium circulation channel composed of a quasi-circular side circulation channel and a long and narrow side circulation channel on the hemispherical shell; and the ratio of the length of the quasi-circular side circulation channel to the length of the medium circulation channel and the ratio of the length of the long and narrow side circulation channel to the length of the medium circulationchannel are 1/2. For a large-temperature-difference flow system, the flow requirements of all branches are low, so that the requirement for small flow adjustment of the valve is high. By changing thestructure of a valve hole in a valve element of a traditional V-shaped ball valve, the flow adjusting precision in different available differential pressure branches can be effectively improved, so that the adjusting sensitivity of the branch with the large available differential pressure is improved.

The invention relates to an electro-hydraulic valve control displacement module and a using method thereof. The electro-hydraulic valve control displacement module comprises a stepping motor, a transmission rod, a feedback connecting rod, a three-position three-way valve, a linear variable differential transformer, a differential cylinder and a differential cylinder sleeve. The stepping motor is in transmission connection with the transmission rod. The differential cylinder sleeve is fixedly connected with the differential cylinder. The top end of the feedback connecting rod is hinged to the three-position three-way valve, and the bottom end of the feedback connecting rod is hinged to the differential cylinder sleeve. The two sides of the feedback connecting rod are hinged to the transmission rod and the linear variable differential transformer respectively. By means of the linear variable differential transformer and the feedback connecting rod, motion information of the stepping motor and the differential cylinder is fed back to a single-chip microcomputer in real time, by means of accurate calculation of the single-chip microcomputer, the displacement relation between the stepping motor and the differential cylinder can be accurately controlled, an operator can control the displacement relation conveniently and accurately, and therefore accurate adjustment is achieved.

The invention discloses a high-pressure tee rotary valve, and belongs to the technical field of rotary valves. The rotary valve comprises a valve body which comprises a feeding inlet and two discharging outlets. A valve element is arranged between the two discharging outlets, and a spanner for controlling the valve element is arranged on the valve element. End covers are arranged on the feeding inlet, the discharging outlets and the valve element. The end covers are connected with the valve body through cross-shaped sunk screws. The end covers are provided with thrust bearings and Greyline rings which are used in cooperation. The high-pressure tee rotary valve can accurately regulate flow, is good in sealing effect, high-pressure resistant, reasonable and simple in structure, and easy to maintain, and has good economic benefits.

The invention discloses a complex ground wire relation conversion circuit. The in-phase input end of an operational amplifier U1 is connected with voltage input; the output end of the operational amplifier U1 is connected with the base electrode of a triode Q2; the emitter of the triode Q2 is grounded; the collector electrode of the triode Q2 is connected with the Vcc + and the base electrode of atriode Q1; the collector of the triode Q1 is connected with the current output; the emitting electrode of the triode Q1 is connected with Vcc +; the Vcc + and the emitting electrode of the triode Q1are connected with the input end of the differential sampling circuit; the output end of the differential sampling circuit is connected with the first end of a resistor R10, the two ends of a resistorR11, the first end of a resistor R12 and the inverted input end of the operational amplifier U1, the resistor R10, the resistor R11 and the resistor R12 are connected in series, and one end of the resistor R11 is connected between the resistor R10 and the resistor R12. The conversion of the ground wire relation in a complex system becomes simple and reliable, and the converted signal is extremelyhigh in precision and extremely high in anti-interference performance.

The invention relates to an aero-engine fuel system. The aero-engine fuel system comprises a fuel tank, a low-pressure pump, a high-pressure gear pump, an opening valve, a two-stage filtering device, a fuel regulating valve, an isobaric regulating valve and a main fuel path, wherein the fuel tank is used for storing fuel, the low-pressure pump is connected with the outlet end of the fuel tank through a fuel supply pipeline, the high-pressure gear pump is connected with the outlet end of the low-pressure pump through the fuel supply pipeline, the opening valve is connected with the outlet end of the high-pressure gear pump through the fuel supply pipeline, a first-stage filtering device of the two-stage filtering device is mounted at the front section of the inlet end of the high-pressure gear pump, a second-stage filtering device of the two-stage filtering device is mounted at the front section of the inlet end of the opening valve, the fuel regulating valve is connected with the outlet end of the opening valve through the fuel supply pipeline, the inlet end of the isobaric regulating valve is communicated with the part, between the second-stage filtering device and the inlet end of the opening valve, of the fuel supply pipeline and is used for regulating and controlling the inlet pressure of the opening valve, the outlet end of the isobaric regulating valve is communicated with the part, between the outlet end of the opening valve and the fuel regulating valve, of the fuel supply pipeline and is used for regulating and controlling the outlet pressure of the opening valve, and the main fuel path is connected with the outlet end of the fuel regulating valve through the fuel supply pipeline. The aero-engine fuel system has the characteristics of simple structure, reliable fuel supply power, small dead weight and the like.

The invention discloses a full-automatic material biodegradation test structure and a test method thereof. The full-automatic material biodegradation test structure comprises a detection container, an air pump, a flow controller, a carbon dioxide absorber, a condensation reflux device, a carbon dioxide detection analyzer and a constant-temperature box, wherein the air pump, the flow controller, the carbon dioxide absorber, the detection container, the condensation reflux device and the carbon dioxide detection analyzer are respectively communicated with one another; the detection container is placed in the constant-temperature box, and a detection material and cultured standard aerobic microorganisms used for decomposing the detection material are placed on the detection container. Through the improvement of the structure, the air pump, the flow controller, the carbon dioxide absorber, the detection container, the condensation reflux device, the carbon dioxide detection analyzer and the constant-temperature box are matched, so that the decomposition capacity of a detection material is detected, manual operation is not needed in the whole detection process and the labor cost is reduced; meanwhile, the problem of inaccurate test results caused by errors in a manual detection process can be avoided, so that the detection accuracy is improved.

A fluid flow resistance assembly includes a fluid pathway. A width of the fluid pathway orthogonal to a flow of fluid through the fluid pathway varies along its length. Positioning of one or more ports at different locations over the fluid pathway at different locations controls a flow rate of fluid.

A sealed three-way ceramic valve is composed of valve core, valve body, sealer and driver, and features that the left and right valve core sets with uniformly distributed 2 or more through hole sare axially or perpendicularly installed in the cavity of valve body, and the drive rings in the drivers in the valve core sets are used to realize linkage. Its advantages include high antiwear, anticorrosion and sealing performance, long service life and correct flow regulation.

The invention relates to a combined ball valve element. The combined ball valve element comprises a spherical valve element body and orifice plates. The top end of the valve element body is a valve stem joint, the middle part of the valve element body is a circular passage, one side of the passage is a small-hole spherical adjustment pair, and one orifice plate is arranged along the flow path in the circular passage of the valve element body. Throttle holes are formed in the lower portions of the orifice plates. One or more orifice plates are arranged in the upper space of the orifice plate and the circular passage, and no orifice plates are arranged in the lower space. The valve element is suitable for both small flow and high pressure differential conditions as well as for large flow andsmall differential pressure conditions, and a valve has a wide application range.