2955 results about "Fluid pressure" patented technology

An auto-occlusion safety device is provided for use in preventing rupture of infusion components during rapid infusion procedures. An occlusion valve is disclosed having a threshold pressure that is less than a rupture tolerance of the infusion system components. As the fluid pressure of the infusion system increases beyond the threshold pressure of the occlusion valve, the occlusion valve is automatically activated thereby occluding fluid flow upstream from a vulnerable infusion component. An accumulator is further disclosed for use in combination with the safety device to compensate for time delays in full activation of the occlusion valve.

A redundant brake unit for a motor vehicle comprises: an inlet port configured to receive fluid under pressure from an external source; an outlet port connected to a supply passage and configured for fluid connection to a wheel brake; a reservoir port connected to a return passage and configured for fluid connection to a fluid reservoir; a boost valve configured to selectively control fluid communication between the inlet port and the supply passage; and a pressure supply unit including a pump element configured to pump fluid between the return passage and the supply passage. The pump element has an inlet directly connected to the reservoir port with no actuated valves therebetween. A normally-closed valve and a throttle valve are disposed in a series configuration between the supply passage and the return passage, with the throttle valve being operable to control a fluid pressure in the supply passage.

The invention discloses a gate valve automatic pressure relief control system and a gate valve, and belongs to the technical field of valve safety control systems.The gate valve automatic pressure relief control system comprises a valve assembly which comprises a valve body and a valve element, the valve element is installed in the valve body, and a pressure relief hole is formed in the valve element; the pressure relief assembly comprises a sealing column, a pressure bearing piece and a driving piece, the sealing column is arranged in the valve element in a sliding mode, the driving piece and the pressure bearing piece are both installed on the valve element, one end of the driving piece is connected with the sealing column and applies acting force for blocking the pressure relief hole to the sealing column, and one end of the pressure bearing piece bears fluid pressure of the inflow end of the valve element; the pressure sensor is used for monitoring the fluid pressure of the inflow end of the gate valve, once the fluid pressure exceeds the set safety pressure, hydraulic oil in the hydraulic pipe is discharged through the hydraulic system, the pressure bearing piece drives the sealing column to slide under the action of the fluid pressure, the flow guide hole communicates with the pressure relief hole, and automatic pressure relief is achieved.

The invention relates to a high-efficiency circulating cooling device for mechanical seal, comprising a gland, a stationary ring assembly mounted on the gland, a dynamic ring assembly rotating with a rotating shaft and a pumping ring rotating with the dynamic ring assembly. The gland is provided with a flow-guiding heat sink for guiding flushing liquid entering from a flushing liquid inlet to the matching end faces of the stationary ring assembly and the dynamic ring assembly. The heat-conducting heat sink can force the flushing liquid to be introduced into the end faces of the stationary ring assembly and the dynamic ring assembly to forcibly take away the heat. Meanwhile, the heat-conducting heat sink can also conduct heat quickly to ensure that the sealing heat is taken away in time, and a stable and reliable liquid film can be formed on the end face. Meanwhile, the flow groove is optimized and improved on the ordinary flow channel, adopts an eccentric circle, and is divided into several sections to form a flow channel, which has the effect of significantly increasing fluid pressure and reducing flow resistance, and the pumping groove is a double-crescent-shaped structure. The pumping ring of this shape has the best pressure and flow rate among all closed pumping rings, and the flow rate is 2 to 3 times that of other structures under the same size.

A plunger pump packing assembly includes a header ring, and one or more seals. The plunger pump packing assembly operates as a scal between a static component and a dynamic component (e.g., reciprocating plunger). The header ring has a vented inside portion to prevent trapping pressure on the outer diameter of the header ring or between the header ring and adjacent seals or packing rings. The vents allow trapped pressure to return when the pumped fluid pressure is lower. A radially protruding edge on the outer diameter of the header ring significantly reduces or prevents migration of abrasive media, such as proppant, between the header ring and the static component. In some examples, the header ring does not contact the dynamic component, thus preventing the trapping of abrasive media particles between the header ring and the surface of the dynamic component.

The invention discloses a gas flow sensor combination device based on temperature and pressure compensation and a flow correction method. The gas flow sensor combination device comprises a flow sensor combination, a pipeline mechanism, a data processing terminal, an environment pressure sensor and an environment temperature sensor. The pipeline mechanism comprises an air inlet pipeline and an air outlet pipeline, and a plurality of branches arranged in parallel are connected between the two pipelines; the flow sensor combination comprises laminar flow sensors arranged on the branches respectively and electromagnetic valves used for controlling the branches to be opened and closed, and the laminar flow sensors comprise laminar flow elements arranged on the corresponding branches. The laminar flow element is provided with a pressure difference sensor device used for measuring the pressure difference of an inlet and an outlet, a tail pressure sensor used for measuring the pressure and the temperature of fluid flowing through the laminar flow element, and a tail temperature sensor. The laminar flow sensor is used for measuring parameters such as temperature, pressure and pressure difference of fluid in real time, the parameters are calculated and corrected to obtain the flow in a standard state, and measured flow data are more scientific and accurate through temperature and pressure compensation.

The invention relates to the technical field of oil exploitation, and discloses a device for simulating hydraulic fracturing to reform a shale reservoir under limited temperature and pressure, the device comprises a bottom plate, an auxiliary feeding mechanism is arranged on the bottom plate, the auxiliary feeding mechanism is used for auxiliary feeding, the bottom plate is connected with a jacking mechanism, and the jacking mechanism is used for jacking the bottom plate. The jacking mechanism is used for jacking and applying external pressure, the auxiliary feeding mechanism is connected with a vibration diffusion mechanism, and transformation modes of the shale reservoir under different pressure conditions can be accurately simulated by accurately controlling confining pressure, axial pressure and fluid pressure; the shale core sample is filled with the gold tube, so that the integrity of the sample can be kept under the condition of effectively transmitting confining pressure, and quantitative analysis of the sample after fracturing transformation is facilitated; after set gas components are injected into the sample bin pipe, water injection fracturing is carried out, and quantitative characterization of the fracturing process is achieved by monitoring the content of fluid produced after fracturing.

The invention discloses a fluid pressure monitoring method and system, and relates to the technical field of pressure monitoring, and the method comprises the steps: determining a hydraulic circulation path, configuring a pressure sensing module, carrying out the real-time pressure monitoring of a first hydraulic oil path, a second hydraulic oil path and a third hydraulic oil path, and generating pressure distribution prediction information through the analysis of a hydraulic control module; through comparison of monitoring data and prediction information, an abnormal pressure distribution path and characteristics are accurately identified, abnormity judgment and dynamic correction are performed based on a reversible abnormity correction model, a correction hydraulic control signal is generated, and closed-loop control is implemented after the correction hydraulic control signal is input into a hydraulic control module. The method solves the technical problem that an existing hydraulic system is difficult to accurately recognize abnormal pressure distribution and carry out real-time dynamic correction under complex working conditions, and the system operation stability is affected, and achieves the purposes of accurately recognizing abnormal pressure distribution and carrying out real-time dynamic correction through multi-path pressure monitoring and a reversible abnormal correction model, and improving the system operation stability. And the operation stability of the system is improved.

Aspects of the disclosure describe an implantable system for monitoring intracranial pressure (ICP) in a subject, the system comprising: a conduit for the flow of cerebrospinal fluid (CSF); a hermetically sealed compartment; a first pressure sensor configured to measure an absolute ICP and output a measurement, wherein the first pressure sensor is hermetically sealed in the compartment, and wherein the first pressure sensor comprises a surface exposed to the CSF in the conduit; a microcontroller disposed in the hermetically sealed compartment that receives multiple inputs including at least the output of the first pressure sensor; and an accelerometer disposed in the hermetically sealed compartment for monitoring a subject's positional status, and wherein the accelerometer communicates an output to the microcontroller.

The invention provides a hydraulic fracture evolution simulation method and device and electronic equipment.The hydraulic fracture evolution simulation method comprises the steps that a damaged rock mass is divided into a plurality of different calculation areas, and a seepage control equation of each calculation area is determined; in combination with seepage anisotropy, determining a seepage tensor of porous medium seepage-stress coupling in each calculation area; associating the seepage control equations of all the calculation areas with phase fields to obtain a target seepage control equation; and determining the displacement, fluid pressure and phase field of the damaged rock mass based on the target seepage control equation. Through the deduced seepage-stress coupling phase field model, the strain energy is decomposed through spectral decomposition, it is guaranteed that crack propagation occurs under the energy generated by tensile strain, and the problem that an existing hydraulic crack research method is limited is solved.

A method and a device for determining fracture closure pressure based on hydraulic fracturing are provided. The method includes: determining a leak-off volume of a fluid during a refrac cycle according to a fluid pressure during the refrac cycle; generating a stiffness change curve during the refrac cycle according to the leak-off volume of the fluid and the fluid pressure; and determining the fracture closure pressure according to the stiffness change curve. A hydraulic coupling mechanism and change characteristics during a pressure attenuation process are quantitatively characterized, and characteristic response corresponding to a pressure drop curve before and after the fracture closure are accurately described, thereby providing a method and a device for determining fracture closure pressure with clear physical significance and objective effectiveness.

The invention discloses a stop valve, and relates to the field of valves. A stop valve comprises a valve seat, a valve cover, a support, a lead screw and a sealing valve column, the liquid inlet end and the liquid outlet end of the valve seat are fixedly connected with liquid conveying pipelines on the two sides through flange plates and bolts respectively, the valve cover is fixedly installed on the valve seat through bolts, the support is fixedly installed on the valve cover, the sealing valve column is arranged in the valve seat, and the lead screw is fixedly installed on the support. The lead screw is fixedly connected to the upper end of the sealing valve column, the upper end of the lead screw upwards penetrates through the valve cover, and the double-opening sleeve is rotationally connected to the support; the operation difficulty of resisting fluid pressure when the valve is opened manually is effectively reduced, the downward pressure of fluid becomes assistance during closing, a worker only needs to reversely rotate the rotating wheel to achieve smooth downward movement of the sealing valve column, operation is convenient and fast, tighter sealing can be achieved through the fluid pressure, and the reliability after the valve is closed is improved.

A milking system, including: a vacuum pump, a receiver, a milk line, and a plurality of milking units. Each milking unit is connected to the milk line via a respective milk conduit. Each milking unit is also associated with a respective valve arrangement, arranged in the milk conduit, wherein the valve arrangement includes an adjustable passage for adjustment of the fluid pressure. The system also includes a pressure sensor, arranged to measure fluid pressure in the milk conduit upstream the valve arrangement; and a controller. The controller is configured to obtain a pressure level measurement from the pressure sensor and generate and provide a control signal to the valve arrangement, to adjust the adjustable passage, based on the pressure level measurement.

The invention relates to the technical field of fluid pressure regulation, and provides an automatic water pressure tracking and regulating method and device for a water curtain test and a storage medium, and the method comprises the steps: obtaining a target water pressure value of a water curtain hole for the current water curtain test, obtaining an actually-measured water pressure value in the water curtain hole in the kth second, and determining the pressure difference between the actually-measured water pressure value and the target water pressure value; the valve opening degree of the electric water valve is controlled in real time according to the pressure adjusting scheme, the pressure of the water curtain hole is rapidly adjusted to the target water pressure value without vibration, and after the water pressure is adjusted to the target water pressure value, the water pressure can be stabilized at the target water pressure value in real time. According to the method, water pressure adjustment is free of oscillation, the phenomenon of fluctuation is avoided, the adjustment speed is higher than that of other methods, water pressure adjustment disturbance resistance can be achieved, and the method has great significance in promoting industry technology development.

A dropper seatpost includes an outer tube and an inner tube disposed in the outer tube and having a first oil chamber and a second oil chamber connected to the first oil chamber. A fluid chamber is provided between the top and bottom ends of the inner tube. A pressure adjustment member is disposed in the first oil chamber to push the oil from the first oil chamber to the second oil chamber. A floating piston is disposed between the second oil chamber and the fluid chamber and pushed by the oil stored in the second oil chamber to compress the high-pressure fluid stored in the fluid chamber. Thus, the present invention allows a user to conveniently adjust pressure of the high-pressure fluid. The arrangement of the first and second oil chambers does not significantly compromise the structural integrity of the inner tube, ensuring that it provides effective support.

The invention discloses a reverse anti-blocking check valve, and relates to the technical field of valve bodies, the reverse anti-blocking check valve comprises a check valve body, and an expansion part is arranged on the surface of a valve plate, facing the fluid direction, of the check valve body; the expansion component comprises a bearing column fixed to the center axis of the surface of the valve plate, and a limiting ring is fixed to the axial top end of the bearing column. The expansion part is arranged on the incident flow side of the valve plate, the dynamic response function in the valve opening and closing process is achieved, when fluid is impacted in the forward direction, the expansion part is unfolded under the fluid pressure effect, the contact arc plate is automatically attached to the inner wall of a pipeline, an auxiliary sealing ring is formed, and the sealing performance is effectively improved; when the fluid pressure is weakened, the expansion component retracts by means of the spring, so that the contact arc plate is separated from the inner wall of the pipeline and generates relative motion, the cleaning effect similar to that of a scraper is achieved, dirt attached to the pipe wall and the surface of a key structure can be effectively peeled off, and the self-cleaning capacity and the anti-blocking effect of the valve are improved.

The invention discloses a high-precision anti-interference pressure transmitter, and relates to the technical field of anti-interference pressure transmitters. Comprising a pressure data acquisition module, a data preprocessing and integration module, a pressure fluctuation feature extraction and quantification module, an intelligent evaluation and deep learning analysis module and a dynamic adaptive monitoring regulation and control module, the pressure transmitter firstly continuously detects the fluid pressure in the earth crust fracture according to a preset initial detection threshold value, and recorded and collected pressure data serve as the basis of all subsequent analysis. According to the method, deep learning analysis and dynamic threshold adjustment are combined, transient pressure fluctuation and magma rising premonition are intelligently distinguished, and the risk of false alarm and missing alarm is reduced. By improving the sampling frequency and optimizing data analysis, a complete pressure change track is formed, the volcano monitoring precision and the anti-interference capability are improved, and efficient technical support is provided for geological safety early warning.

A flow fuse valve configured to be installed inline within a primary flow channel section having an interior wall, a first flow region, and a second flow region, the flow fuse valve having: a valve body; a poppet assembly disposed within the valve body, the poppet assembly having: a first poppet section; a second poppet section; a resilient seal member disposed and captured between the first poppet section and the second poppet section, wherein the first and second poppet sections are securely fastened with respect to each other subsequent to the resilient seal member being captured therebetween; and a resilient biasing member disposed between the first poppet section and the valve body 100 that is configured to bias the poppet assembly toward an open-valve position; wherein the resilient seal member and the valve body are configured to form a fluid flow seal in response to the poppet assembly being disposed in a closed-valve position via an abrupt fluid pressure drop in the primary flow channel section downstream of the flow fuse valve, wherein the fluid flow is from the first flow region toward the second flow region.

A hydraulic actuator includes a tube capable of being expanded and contracted by fluid pressure, a sleeve that is a structural member made of woven fiber cords directed in predetermined directions to exert stretchability and covers an outer circumferential surface of the tube, a sealing member that seals each end of the tube in an axial direction thereof, and a restraint member that is provided at a part of a circumference of the tube to extend from one end to another end of the tube in the axial direction and restraints an elongation of the part of the circumference of the tube in the axial direction. The predetermined directions in which the fiber cords of the sleeve are directed are oriented such that the tube elongates when expanded. The restraint member is woven into the sleeve to be integrated therewith, or disposed between the sleeve and the tube.

A cylinder deactivation system for an engine includes an engine block defining a cylinder. A valve opens and closes a port to the cylinder. A rocker arm pivots to operate the valve. A camshaft has a cam lift and a cam-to-rocker input system transfers the cam lift through the rocker arm to the valve. A deactivation assembly is disposed in the rocker arm and is responsive to fluid pressure to alternately effect an activated state of the valve and a deactivated state of the valve.

The invention provides a control method and device for cleaning equipment, the equipment, a medium and a program product, and can be applied to the technical field of liquid cooling servers. The method comprises the steps of determining a pressure difference value between a reference pressure value and a real-time pressure value of fluid at an outlet of a target pump in the cleaning equipment; a preset pressure control parameter is used for processing the pressure difference value based on a lag relation, a rotating speed adjusting signal is determined, and the lag relation indicates the lag degree between the rotating speed change moment of the target pump and the change moment of the collected fluid pressure value; the target pump is controlled to operate based on the rotating speed indicated by the rotating speed adjusting signal to adjust the output flow of the target pump, so that the adjusted pressure value is close to the reference pressure value; wherein the pressure control parameter is obtained by performing simulation calculation on a hysteresis relation based on an inertia time constant and pressure wave propagation delay time of the fluid at the outlet of the target pump.

The invention relates to the technical field of distributed control systems, and discloses a distributed valve body remote control system which comprises a valve body state acquisition module, a remote communication analysis module and the like. The valve body state acquisition module acquires parameters such as opening, fluid pressure and surface temperature of a multi-area valve body according to a monitoring period, and a high-frequency monitoring mode can be started; the remote communication analysis module evaluates communication delay; the distributed coordination module synchronizes parameters when communication is normal, and calculates a dynamic regulation factor through a formula to generate a regulation instruction; the instruction distribution module determines an instruction distribution sequence according to a priority weight formula, and is provided with delay and forced distribution strategies; and the abnormal response module gives an alarm and marks the position code of the valve body when the communication delay exceeds the limit or the weight is continuously too low. And the system also checks and complements the acquired data. The system improves the monitoring control precision and reliability, and is suitable for remote monitoring of multi-area valve bodies.

A system for controlling a wheel brake on an auxiliary axle of a vehicle includes an electro-pneumatic drive axle brake control valve that deliver fluid pressure from a fluid source to a drive axle wheel brake on a drive axle of the vehicle responsive to an electronic control signal. An auxiliary axle brake control valve delivers fluid pressure from the electro-pneumatic drive axle brake control valve to an auxiliary axle wheel brake on the auxiliary axle of the vehicle responsive to a fluid pressure control signal. A fluid control signal generating valve generates the fluid pressure control signal responsive to a command to apply a steer axle wheel brake on a steer axle of the vehicle.

The invention is concerned with the dispenser (1) for dispensing a fluid (F), with a pump device which has a pump chamber (2), an inlet valve and an outlet valve (3, 4) and a pump piston (5) with a longitudinal axis (x), wherein a fluid pressure is generated during a pumping process for dispensing fluid (F) and the outlet valve (4) has a sealing position in which it rests sealingly against the pump piston (5). In order to provide a dispenser (1) advantageously designed, it is proposed that the outlet valve (4) can be moved relative to the pump piston (5) while maintaining the sealing position and can be deformed by the fluid pressure in a radial direction relative to the longitudinal axis (x) for the passage of fluid (F).

The present application discloses a rigid pressure stabilizing device for an oil drilling pump, belonging to the field of oil drilling equipment. The key technical points of its technical solution include a housing, a separating ring, and a fixing column. Among them, the housing is provided with an inlet and outlet hole for fluid to enter and exit, which is communicated with the discharge pipe of the drilling pump; the separating ring divides the interior of the housing into a first space and a second space, and the two are communicated through a communication hole. A plurality of annular first fins are arranged in the first space, alternately arranged and provided with shunt holes, which helps to stabilize the fluid pressure; a plurality of annular second fins are arranged in the second space, also alternately arranged and provided with shunt holes. The inlet and outlet hole, the first space, the communication hole, and the second space form a circulation channel for fluid to circulate, achieving the effect of improving the working reliability of the drilling pump and effectively reducing the failure rate caused by pressure fluctuations.

The present application provides a shunt device, comprising a shunt member and a flow regulating mechanism. The shunt member comprises a body and an inlet and an outlet located at two ends of the body, and the shunt member defines a shunt passage for pressurized fluid; the flow regulating mechanism is connected to the shunt member, and the flow regulating mechanism is used for regulating the flow of the pressurized fluid flowing through the shunt passage; the flow regulating mechanism comprises a blocking portion having a variable form, and the blocking portion is configured such that when the fluid pressure at the inlet of and / or inside the shunt member is less than the fluid pressure outside the flow regulating mechanism, the blocking portion is driven by the fluid pressure outside the flow regulating mechanism to radially collapse, so that the flow regulating mechanism partially closes the shunt passage.

The present disclosure relates to a method for evaluating a temporary plugging effect of fracturing in a low-permeability oil-gas reservoir based on monitoring pressure. The method comprises: calculating a wellbore friction resistance along a way from a wellhead to a target fracturing segment; calculating, based on a wellhead pressure monitored at the wellhead in real time, a wellbore pressure at the target fracturing segment; calculating a fluid pressure at a crack opening of each perforation cluster; calculating a perforation friction resistance coefficient of each perforation cluster; calculating a fracturing fluid instantaneous displacement of each perforation cluster; calculating, based on the fracturing fluid instantaneous displacement of each perforation cluster, a variation coefficient of a fracturing fluid displacement distribution after a fracturing construction is completed; and evaluating the temporary plugging effect of fracturing based on the variation coefficient.

The invention discloses a fluid pressure driving type controllable rubber sealing device and a control method thereof. The fluid pressure driving type controllable rubber sealing device comprises a sealing ring, a pressure adjusting device and a monitoring control system. The sealing ring comprises a plastic ring and a rubber outer ring; the pressure adjusting device comprises a rubber inner ring, a fluid conveying pipe and a valve element. The monitoring control system comprises a monitoring device, a microprocessor, a controller and a voltage transformation device. According to the control method, the leakage amount of the sealing element is monitored in real time through the monitoring device, the compensation pressure needed by the annular pressure cavity in the rubber inner ring is obtained through analysis and calculation of the microprocessor, the pressure transformation device is controlled by the controller to open and close the valve element, contraction and expansion of the sealing element are achieved, and the purpose of accurately controlling leakage is achieved. The environment adaptability of the sealing element is enhanced, long-term stable operation of sealing is ensured, and the service life of the sealing element is prolonged.

According to one aspect, a method includes applying a first force to a piston using an actuator that includes a displacement indication arrangement. The piston is part of a hydraulic braking system included in a vehicle. The hydraulic braking system includes fluid, wherein when the first force is applied to the piston, the piston moves. The method further includes determining when a pressure of the fluid reaches a target pressure, obtaining at least a first measurement of a displacement of the piston when the pressure of the fluid reaches the target pressure using the displacement indication arrangement, and determining when the at least first measurement of the displacement of the piston indicates an anomaly in the hydraulic braking system. When it is determined that the at least first measurement of the displacement of the piston indicates the anomaly, the anomaly in the hydraulic braking system is identified.

Disclosed is a fracture plugging simulation experimental device and an experimental method thereof. The device comprises a simulated wellbore, a simulated formation, a simulated fracture, a plurality of pressure sensors and vales, a mixing barrel, a liquid injection port and a pressurization port, a liquid collection tank, a plugging fluid storage tank, a heating device, etc. The method comprises: loading the simulated formation with the simulated fracture in the simulated wellbore, closing the second valve and turning on the mixing device, injecting a lost circulation material into the mixing barrel, closing the liquid injection port and turning on the heating device and pressurizing, stopping pressurizing and opening the second valve to establish a plugging process, turning on the plunger pump to continue pressurizing, and collecting a fluid pressure change of the simulated fracture in the plugging process; and calculating a pressure-bearing capacity of plugged fracture.