350results about "Fluid pressure control" patented technology

The invention provides an intelligent irrigation control method and system for a high-standard farmland. The method comprises the following steps: acquiring crop canopy image data and farmland terrain elevation data of different crop planting areas in the high-standard farmland; determining a crop growth stage based on morphological characteristic data in the crop canopy image data, and constructing a soil hydrodynamic simulation model according to a root distribution depth interval and a theoretical water absorption rate coefficient corresponding to the crop growth stage; and based on the farmland terrain elevation data and the soil porosity parameter, generating a soil moisture migration parameter by using a soil hydrodynamic simulation model, generating a pipe network pressure regulation and control instruction in combination with the soil moisture migration parameter and a preset irrigation strategy, and adjusting the water outlet pressure distribution of the intelligent irrigation pipe network according to the pipe network pressure regulation and control instruction. Generating an irrigation control instruction; accurate space-time matching of irrigation of the multi-crop rotation area is achieved, the water utilization efficiency is improved, and the problem of irrigation uniformity at the terrain difference and the rotation boundary is solved.

Method for compensating liquid-transmitted acoustic disturbances of a liquid-tempered optical component (110) of a lithography system (1), wherein the disturbances of the optical component (110) as a first optical component (110) are compensated by means of a non-liquid-tempered second optical component (112) of the lithography system (1), comprising the steps: a) Receiving (S1) a first and second actual value (y 1 , y 2 ) of a position (P 1 , P 2 ) corresponding to the first and second optical components (110, 112), and b) Rules (S3) of the position (P 2 ) of the second optical component (112) to an adjusted target value (r 2 ) of the position (P 2 ) of the second optical component (112), which is set to an initial target value (r i ) of the position (P 2) of the second optical component (112) and the first actual value (y 1 ) of the position (P 1 ) of the first optical component (110).

The invention provides a safety risk control method for geological storage of carbon dioxide and electronic equipment. A distributed optical fiber sensing system is arranged in at least one injection well of the target sealing and storage area in the axial direction of a shaft and penetrates through a main cover layer and a reservoir; the method comprises the following steps: acquiring background data through a distributed optical fiber sensing system, and establishing a multi-parameter baseline model including a temperature field, a strain field and background noise; temperature, strain and sound wave vibration signals are collected in real time, and key features are extracted; the key features extracted in real time are compared with a preset risk feature library, the types of risk events are identified, and the identified risk events are graded according to the spatial range and intensity of the abnormal signals; and according to the type and the grade of the risk event, generating and executing a corresponding control instruction. According to the embodiment of the invention, the optical fibers are distributed in the whole area along the shaft and the target stratum, a three-dimensional monitoring network covering the sealing body is constructed, and the hysteresis quality of traditional point type measurement and periodic exploration is overcome.

The present invention provides an ultra-high precision pneumatic force servo system and an intelligent control parameter optimization method therefor. The pneumatic force servo system is mainly composed of a double-acting air-floating frictionless cylinder and a pressure control system; the effect of friction on the control accuracy can be removed by using the air-floating frictionless cylinder; the pressure control system achieves ultra-high precision control of pressure by means of a fuzzy PI controller optimized on the basis of a novel improved particle swarm algorithm; a Gaussian variation strategy and a fuzzy control theory are integrated in the novel improved particle swarm algorithm; optimized fuzzy PI control parameters are obtained using the novel improved particle swarm algorithm and ultra-high precision pressure control of a chamber of the air-floating frictionless cylinder is performed on the basis of the parameters, such that ultra-high precision force output of the system can be achieved; the pneumatic servo system provided by the present invention can be applied to occasions where high control accuracy of force is required, expanding the application range of the pneumatic servo system.

The present invention is directed to a buffer (1) for storing liquid at a consumer pressure. The buffer comprises a storage volume (4) for holding a liquid and a gas. The storage volume may be separated by a partition element (5) into a liquid compartment (6) for holding the liquid and a gas compartment (7) for holding the gas. A pressurization means (8) is configured for increasing the pressure of gas in the storage volume (4) to an operating pressure when liquid is or has been drained from the storage volume (4). A ventilation means (14) reduces the pressure of gas in the storage volume (4) back to the operating pressure when the storage volume (4) is filled with liquid. Further, a water supply system (23) for an aircraft (30) comprising the buffer (1) and an aircraft (30) comprising such a water supply system (23) are described and claimed.

There is disclosed a first stage pressure reducer for a breathing apparatus comprising: a body defining a cavity, the cavity having a higher-pressure region configured to receive higher-pressure gas from a gas source, a lower-pressure region configured to receive lower-pressure gas from the higher-pressure region, and a piston bore, the piston bore connecting the higher-pressure region and the lower-pressure region; a piston configured to move reciprocally through the piston bore, and further configured to transfer gas from the higher-pressure region to the lower-pressure region; a bushing disposed coaxially with the piston bore and around at least a portion of the piston, the bushing arranged to engage the piston and inhibit contact between the piston and the piston bore; and a sealing element arranged between the higher-pressure region and the bushing, the sealing element configured to isolate the bushing from the higher-pressure region. Also disclosed is a self-contained breathing apparatus comprising a first stage pressure reducer.

An electronically controlled regulator may include a pressure regulating valve, which may include a discharge pressure regulating unit that adjusts a pressure of a fluid by changing a distance between a valve body and a valve seat while reciprocating a valve shaft by a valve shaft moving structure using a feed screw, a slidable piston that receives a fluid pressure in a discharge pressure chamber, and a spring that constantly biases the valve shaft in a valve closing direction. At the time of valve closing, the fluid pressure received by the piston may be converted into a pressure load in a direction of pressing the valve body, and at a time of pressure adjustment, a positional deviation of the valve shaft due to a backlash provided at a meshing portion of the feed screw may be avoided by a biasing force of the spring.

A pneumatic gauge and pressure control device includes a pneumatic gauge that is manually movable from a neutral position to: (i) a fill position for compressed air to flow from a compressed air source into a system; or (ii) a vent position for compressed air to be vented from the system. The pneumatic gauge can rotate or slide from the neutral position to the fill and vent positions. A method for controlling a flow of compressed air with respect to a pneumatic system includes manually moving a pneumatic pressure gauge from a neutral position to a fill position to cause compressed air to be communicated from an associated compressed air source into the pneumatic system and / or moving the pneumatic gauge from the neutral position or from the fill position to a vent position to cause compressed air to be vented from the pneumatic system.

The present disclosure relates to devices for tightening threaded fasteners. Specifically, the present disclosure relates to a pneumatic fluid pressure regulator assembly for use with a pneumatic torque tool for tightening and / or loosening threaded fasteners, comprising: a piston assembly; a regulator assembly; and a filter assembly. Additionally, the present disclosure relates to a pneumatic torque tool for tightening and / or loosening threaded fasteners, and an activation lockout safety assembly for use with a pneumatic torque tool for tightening and / or loosening threaded fasteners.

A system for cooling servers mounted in a rack, comprising: a door mounted to open and close; a condenser mounted on the door and having a condenser vapor inlet port, and pivoting with the opening and closing door; a rack vapor manifold mounted along a side of the rack, having rack vapor inlet ports for association with a plurality of slots, and arranged to receive coolant vaporized by electronic components, and including a plurality of rack vapor outlet ports; a vapor manifold mounted on the door having a plurality of door vapor inlet ports, and a door vapor outlet port connected to the condenser vapor inlet port; and a plurality of flexible tubes interconnecting the rack vapor outlet ports to the door vapor inlet ports along the hinged side, to maintain flow-connections between the rack vapor manifold and the door vapor manifold while the door opens and closes.

Disclosed are a hydrogen purification system and a control method thereof. The hydrogen purification system includes a hydrogen purification module, a control unit, and a pressure control unit. The control unit is coupled to the pressure control unit, and the pressure control unit is connected to an anode gas outflow path of the hydrogen purification module. The control method includes the following steps. First, providing a mixed gas including hydrogen to the hydrogen purification module. Secondly, providing an electric power to the hydrogen purification module to perform an oxidation-reduction reaction of hydrogen. After that, utilizing the pressure control unit to instantly increase and decrease a pressure of an anode in the hydrogen purification module, wherein the control unit controls opening and closing of the pressure control unit. An instantaneous increase in the pressure of the anode in the hydrogen purification module is higher than or equal to 0.04 bar.

A magazine that includes a pre-pack and a gas regulator system, with the pre-pack including a gas canister and non-lethal projectiles in addition to a drive mechanism for introducing non-lethal projectiles into gun chamber.

The present invention relates to the technical field of air pressure intensity regulation, and discloses a pressure control method and device for accurately regulating air pressure intensity, wherein the method comprises: performing digital conversion and temperature and humidity compensation on the original pressure signal collected by the pressure sensor array to obtain a pressure data matrix and a pressure gradient matrix; calculating the pressure distribution centroid and the pressure fluctuation spectrum to obtain a pressure spatial distribution feature matrix and a pressure time domain feature matrix; inputting a three-state Markov model for dynamic state recognition to obtain a pressure state transition probability matrix and a pressure response prediction matrix; constructing an objective function including a pressure tracking error term and an organizational safety constraint term, and solving to obtain a PID control parameter matrix and a pressure safety limit matrix; constructing a three-level control system including a basic controller, an interference compensator and a safety protector, and outputting an air pressure regulation drive signal. The method realizes high-precision pressure sensing control.

The invention relates to a compressor module (10), in particular for a compressed-air supply system (20) of a vehicle. The compressor module (10) comprises a compressor (12) and a speed-regulated brushless electric motor (14) for driving the compressor (12). During operation of the electric motor (14), a motor current (IB) arises. The electric motor (14) is assigned motor electronics having an electronic commutator and speed regulation. The compressor module is connected to or comprises an electronic control unit (100). The electronic control unit (100) is designed to specify, according to the average motor current (IB), one of at least two different target speeds for the electric motor (14), namely at least a predefined first target speed (n1, soll) and a predefined second target speed (n2, soll) which is less than the predefined first target speed (n1, soll), and to switch from specifying the predefined first target speed (n1, soll) to specifying the predefined second target speed (n2, soll) when the average motor current (IB) reaches or exceeds a specified motor-current current limit value (Imax; Imax, red).

The present invention relates to a valve device (100) for a compressor unit (1), preferably of a commercial and / or rail vehicle, comprising a valve piston (110) having a front side (111) for at least partial exposure to compressed air, and a valve housing for receiving the valve piston (110), wherein the front side (111), the compressor pressure section, and the delivery pressure section (114) are provided such that the predeterminable opening pressure is greater than the predeterminable closing pressure. Furthermore, the present invention relates to a compressor unit (1) and a vehicle, in particular a commercial and / or rail vehicle.

A capacity control valve with which a valve element can be smoothly controlled and the valve element can be stably held at a maximum stroke position is provided. In a capacity control valve V, a position of a valve element 51 is changed by drawing a movable iron core 84 to a fixed iron core 82 with magnetic force by energization of an electromagnetic coil 86. The iron core 82 on one side includes a projected portion 90 on the radially outer side, the iron core 84 on the other side includes a projected portion 92 on the radially inner side, and these projected portions are capable of being loosely fitted to each other when the movable iron core 84 is drawn to the fixed iron core 82. The projected portion 90 is formed to be smaller than an opposing surface 93 of the iron core 84 facing an effective magnetic force surface 90a of a distal end of the projected portion and formed in a tapered shape.

The present invention relates to a sealing test apparatus (D1) for a system that isolates two media in a sealed manner, the system including a flange and a sealing blocking device mounted in the flange, the test apparatus comprising: a housing (36) including an expandable seal (48) intended to contact the system in an expanded state and ensure the sealing of a test space defined between the system and the housing; a pneumatic pump (P1) and a pneumatic circuit (C1) configured to connect the pump (P1) to the expandable seal (48) in a first step such that the pump (P1) expands the expandable seal (48), and to connect the pump (P1) to the test space in a second step such that the pump (P1) generates a pressure of a given value in the test space; and means for measuring the pressure in the test space.

A system for producing a powder-gas jet for performing a dental treatment, wherein the system is configured for being connected to a dentist chair by a connection, wherein the connection of the system to the dentist chair allows the system to be fed by a pressurized gas flow, the system comprising a compressed gas circuit configured to direct the pressurized gas flow into a powder-gas-mixing chamber to form a gas-powder mixture, the system being wherein the compressed gas circuit comprises at least a pressure regulation device having an inlet and an outlet, the regulation device being configured to provide the pressurized gas flow with a pressure at its outlet that is independent of the pressure of the gas flow at its inlet, when it is fed by the pressurized gas flow.

A liquid pressure calibration apparatus is disclosed, wherein a first liquid path (200) and a second liquid path (300) with different pressure output ranges are arranged in parallel between a liquid pressure inlet port (A) and a liquid pressure output port (B) of the liquid pressure calibration apparatus, and the pressure output range of the first liquid path (200) is continuous with the pressure output range of the second liquid path (300). A target pressure to be output is compared with a switching pressure, and the first liquid path (200) or the second liquid path (300) is selected to supply pressure to the liquid pressure output port (B) based on the comparison result, and the target pressure is output.

The present disclosure provides a pressure control method and device, and a semiconductor process apparatus. The method comprises: acquiring set pressure and measured pressure of a reaction chamber; if the measured pressure is inconsistent with the set pressure, determining a movement direction of a pressure regulating valve on the basis of the measured pressure and the set pressure, and controlling the pressure regulating valve to move in the movement direction; during movement of the pressure regulating valve, continuously acquiring the measured pressure, and when the measured pressure falls within a set range near the set pressure, controlling the pressure regulating valve to stop moving; and on the basis of the measured pressure and the set pressure, performing closed-loop regulation on the pressure regulating valve. By ending open-loop regulation in advance or delaying the ending of the open-loop regulation, the present application avoids pressure hysteresis or pressure advance, so that the timing for ending open-loop regulation (or the timing for starting the closed-loop regulation) is relatively accurate, and the closed-loop regulation time is relatively short, and thus, the response time of the whole pressure control procedure is relatively short, the pressure in the reaction chamber is relatively stable, and the process quality of a product is ensured.

Disclosed is a self-power-generating digital pressure reducing valve, comprising a main valve (1), and further comprising an electric pressure reducing pilot valve (2). A water inlet port of the electric pressure reducing pilot valve (2) is connected to a water inlet end of the main valve (1) by means of a first pipe (3); a water outlet end of the main valve (1) is connected to a water outlet port of the electric pressure reducing pilot valve (2) by means of a second pipe (4); the water outlet port of the electric pressure reducing pilot valve (2) is connected to an upper diaphragm cavity of a main valve control chamber by means of a third pipe (5); a lower diaphragm cavity is connected to the outside by means of a fourth pipe (15); a fifth pipe (6) is further connected between the water inlet end and the water outlet end of the main valve (1); and a hydroelectric generator (7) is provided on the fifth pipe (6). The digital pressure reducing valve further comprises pressure detection devices (8) arranged before and after the main valve, and a controller for receiving detection signals of the pressure detection devices (8) so as to control the opening and closing of the electric pressure reducing pilot valve (2); and the hydroelectric generator (7) is connected to the pressure detection devices (8) and the electric pressure reducing pilot valve (2). The digital pressure reducing valve can achieve self-power generation to meet power utilization requirements of electric devices, and can be remotely regulated and controlled.

The invention relates to a gas control valve (1) for electronic pressure control of a gas-air mixture at a gas boiler, wherein the gas control valve (1) comprises a central module (40), a control module (20), and a sensor module (30), wherein the central module (40) is permeable to gas flow from a valve inlet (41) to a valve outlet (42), wherein the control module (20) can be arranged directly on the central module (40) and is configured to control the flow of gas through the central module (40) with a throttle element (23) arranged fluidically between the valve inlet (41) and the valve outlet (42), wherein the sensor module (30) can be arranged directly on the central module (40) and comprises at least one sensor (31, 32) which is operatively connected to the gas flowing through the central module (40) via a gas inlet (44) arranged fluidically between the throttle element (23) and the valve outlet (42). and which is trainedFor pressure control, a pressure difference between the gas flowing through the central module (40) and air having a reference pressure is to be detected.

Techniques for controlling water pressure at a plurality of water customer service sites are described. In an example, a first plurality of water service sites having water pressure values greater than a first threshold value are identified. A second plurality of water service sites having pressure values less than a second threshold value are identified. Valves controlling water flow to respective customer service sites within the first and second pluralities of water service sites are adjusted. The adjustments increase water pressure in the second plurality of water service sites to a pressure above a minimal target pressure. The adjustment maintains the water pressure of the first plurality of service sites above the minimal target pressure. In an example, groups of water service sites are associated with respective water mains and / or water pressure sensors. Information shared between groups may assist in adjusting water valves within the water system.

An air supply system for a fuel cell stack of a fuel cell system includes a compressor, a check valve located in a cathode outlet line, a connection point located in the cathode outlet line connecting an external system to the air supply system, a compressor outlet sensor that determines a measured compressor outlet pressure, a pressure differential request based on a required flow rate measured at the connection point, and one or more controllers in electronic communication with the compressor, the check valve, and the compressor outlet sensor. The one or more controllers learn a parameter of a check valve command via forward feedback when a feedback component of the check valve command is a non-zero value.

Provided is a valve capable of accurately controlling the pressure discharged from the valve. A valve (1) is provided with a valve body (51) and a valve seat (15a) that are provided between one pressure chamber (13) and the other pressure chamber (14) and that control the flow rate of a fluid passing through the one pressure chamber (13) and the other pressure chamber (14) by opening and closing, in which the valve body (51) and the valve seat (15a) are provided in a part of the other pressure chamber (14), and the valve body (51) and the valve seat (15a) are provided in the other pressure chamber (14). A pressure-sensitive body (61) into which the pressure of one pressure chamber (13) is introduced is disposed so as to be capable of being brought into contact with or separated from the valve body (51).

A valve device (330) for a system, in particular a brake system for a vehicle, is presented, wherein the system comprises a first control unit and a second control unit, the control units being electrically connectable to or connected with the valve device (330). The valve device (330) comprises a valve unit (450) with at least one actuator (452) for actuating the valve unit (450), a valve housing (435) for receiving the valve unit (450), and a fault protection module (440) arranged outside the valve housing (435).The fault protection module (440) comprises a first supply connection (441) for electrical connection to the first control unit, a second supply connection (442) for electrical connection to the second control unit, a first main connection (445) for electrical connection to the first control unit, a second main connection (446) for electrical connection to the second control unit, a first connecting connection (447) electrically connected to the first supply connection (441) and the second supply connection (442) for electrical connection to the actuator (452), a second connecting connection (448) electrically connected to the first main connection (445) and the second main connection (446) for electrical connection to the actuator (452), a first electrical protection circuit (460) and a second electrical protection circuit (470).The first protective circuit (460) is electrically connected between the first supply terminal (441) and the second supply terminal (442) on the one hand, and the first connecting terminal (447) on the other. The second protective circuit (470) is electrically connected between the second connecting terminal (448) on the one hand, and the first main terminal (445) and the second main terminal (446) on the other. At least one protective circuit (460, 470) comprises at least one electrical fuse (462, 472) and / or at least one diode element (464, 474) connected in series with the respective supply or main terminal.

The present invention relates generally to the field of automated process control systems and methods. More specifically, the present invention relates to controlling a pumping station including a plurality of variable speed pumps connected to a closed supply network (e.g., a water distribution system (WDS)). The claimed invention represents a system and method of controlling a plurality of VSPs, which provide a technical improvement of a technical field of automated process control by decreasing the total and instantaneous power consumption of the plurality of VSPs while maintaining the required flow volume demand at the desired pressure setpoint, as well as increasing the effectiveness of adjustment to changing demands of the network and extending motor life of pumps by balancing frequency of their starts and stops.

To provide a valve system that allows a valve opening position of a blocking valve to be estimated sooner.SOLUTION: A valve system 1 includes a tank 2 capable of storing fluid, a pressure sensor 6 for detecting inner pressure of the tank 2, a valve 4 having a valve body 11 and opening / closing the tank 2, a stepping motor 12 for stroking the valve body 11 of the valve 4, and a control device 5. The control device 5 moves the valve 4 in a valve opening direction after the start of a cycle, reverses the moving direction of the valve body 11 of the valve 4, moves the valve to a stand-by position for a valve closing state, calculates a first pressure change ratio, which is a change ratio of the inner pressure from the start of the cycle, determines a stand-by time so that a second pressure change ratio of the inner pressure, which is a change ratio of the inner pressure from the start to the end of the cycle, is equal to a target change ratio if the first pressure change ratio is greater than the target change ratio, and stops the stepping motor 12 at the stand-by position until the determined stand-by time elapses.SELECTED DRAWING: Figure 1

The invention relates to a device for operating non-explosion-proof equipment in a potentially explosive atmosphere, comprising a pressurized housing (1) designed to accommodate the non-explosion-proof equipment (2), a purge gas inlet (3) arranged upstream of the housing (1) through which a protective gas (4) can be supplied to the housing (1) under overpressure, and a purge gas outlet (7) arranged downstream of the housing (1) through which the protective gas (4) can be discharged from the housing (1). For the discharge of the protective gas (4), an outlet valve (8) with a valve seat (16) and a valve body (30) is arranged in the purge gas outlet (7). The valve body (30) is connected to the first end of a guide axis (31) which is slidably mounted in a through bore (21) in the valve seat (16) along the valve axis (15) so that the valve body (30) is axially adjustable between a closed position and an open position.By means of a spring element (34), the valve body (30) is biased against the valve seat (16) in the closed position. To achieve efficient and gentle operation with moderate equipment costs, the invention proposes that a baffle element (32) be attached to the opposite second end of the guide axis (31) and that a control housing (25) with a working chamber (28) be connected to the valve seat (16), wherein the baffle element (32) is arranged within the working chamber (28) and without contact with the control housing (25). Furthermore, the control housing (25) has a connection (27) to which a control line (9) is connected for supplying the working chamber (28) with a working fluid (29), via which the working chamber (28) and the baffle element (32) arranged therein can be pressurized with the working fluid (29) from the control line (9).

A fluid control system is provided for controlling flow of a process fluid through a pipeline. The fluid control system can include a valve arranged to control a flow of process fluid, an actuator configured to adjust a position of the valve, and a controller configured to control movement of the actuator. The system may include a switching valve in communication with the actuator and the controller. Further, a solenoid valve may be in communication with a first port of the switching valve. In one example, depending on pressure at the first port of the switching valve, the switching valve is operable in a first state to provide process fluid to the valve controller and permit movement of the actuator and in a second state to block flow of process fluid to the valve controller and block flow of process fluid from the pneumatic actuator.