1736 results about "Water hammer" patented technology

The invention discloses a water supply pipe network water hammer control method and system based on multifunctional module fusion, and relates to the technical field of data identification. A time sequence diagram neural network prediction and traceability module which realizes water hammer risk prediction and propagation path traceability based on a causal constraint graph neural network model; the reinforcement learning intervention decision module is used for generating an active intervention strategy through a reinforcement learning agent, forming closed-loop control, abstracting a water supply pipe network into a graph structure, and modeling in combination with a time sequence, so that a propagation path of pressure waves can be comprehensively reflected, a blind area of traditional local modeling is overcome, and the comprehensiveness and accuracy of water hammer event detection are improved; and a causal analysis result is input as an adjacent matrix, so that the interference of irrelevant edges on prediction in topology is effectively eliminated, and the learning efficiency and causal traceability of the model are improved.

The invention discloses a water flow intelligent monitoring system and method, and relates to the technical field of water flow intelligent monitoring, in combination with an actuator health degree evaluation and multi-target prediction control method, the characteristics of a valve and a water pump are finely described by arranging sensors and constructing a digital twinborn model; model predictive control or multi-agent reinforcement learning is adopted to dynamically generate a reliable and efficient control instruction; furthermore, through real-time closed-loop deviation detection and self-adaptive correction, delay, faults or communication abnormity of the actuator can be accurately dealt with; 4, quickly completing self-healing and fault-tolerant control by using a fault prediction and standby scheduling strategy to prevent failure diffusion; and 5, scenes such as rainfall flood, fire fighting and reclaimed water are incorporated into the same framework, and multi-scene coupled comprehensive water resource management is realized, so that water hammer impact and water leakage risks can be effectively reduced, and the safety of the water supply system under complex working conditions or equipment aging is remarkably improved.

The invention discloses an intelligent cooperative switching control system and method for multi-path valve runners, and the method comprises the steps: collecting all-condition operation data of a multi-path valve system, extracting valve switching characteristic parameters, and building a runner mapping relation between paths; a cascade action chain containing time sequence dependence is constructed based on the mapping relation and the switching characteristics, and the action sequence and the trigger condition of each drift diameter are determined; by analyzing the pressure distribution and the flow velocity change in the cascade action chain, predicting the water hammer strength and designing a reverse pressure wave parameter, and generating a water hammer counteracting control instruction; high-low pressure area distribution in the flow field is identified, a flow field complementary cooperation scheme is constructed, and a pressure balance control strategy is generated; analyzing a pressure wave propagation path to determine a superposition elimination point, extracting pressure pulse resonance characteristics and generating time sequence control parameters; and the sequential control parameters are matched with the cascade action chain, synchronous control nodes are determined through delay compensation, and a time-sharing control sequence is generated to achieve intelligent cooperative switching of the multi-drift-diameter valve flow channels.

The invention provides a steam conveying control method and system based on multistage pressure regulation and dynamic feedback, and the method comprises the steps: obtaining real-time data, including pressure, flow and vibration signals, of a multi-source sensor in a steam pipe network, and forming a multi-dimensional data set; after judging that the water hammer phenomenon occurs, analyzing the vibration signal to obtain an abnormal vibration frequency in a pipe network, determining a propagation path of impact waves by combining pressure data, and positioning an area where an impact source is located; performing pressure grading control of partition differentiation according to the affected partitions; acquiring and analyzing the steam flow fluctuation condition of each affected subarea, analyzing the steam flow fluctuation condition of each subarea, determining target flow and priority, and adjusting the opening degree of an adjusting valve; real-time pressure and flow reading of a pipe network are continuously monitored, and setting of pressure adjusting points of all levels and the opening degree of the corresponding adjusting valve are dynamically adjusted so that steam conveying can be stably controlled.

The invention relates to the technical field of valves, and discloses a self-adaptive flow proportion stop valve which comprises a valve body, a valve rod, a valve rod, a valve rod and a valve rod. The liquid inlet pipe is used for introducing fluid into the stop valve, and the liquid inlet pipe is fixedly connected to the left side of the valve body; and the liquid outlet pipe is used for discharging the fluid from the stop valve. According to the stop valve self-adaptive to the flow proportion, the cutting mechanism is arranged, when liquid passes through the impeller, the impeller is driven to rotate clockwise, and the cutting column rotates reversely relative to the impeller, so that pressure fluctuation in the liquid flowing process can be effectively relieved, the water hammer effect or impact caused by sudden pressure change is reduced, and other assemblies in a system are protected; particularly, when the liquid flow is large or the flow speed is high, the rotating action of the cutting column rotating reversely relative to the impeller is beneficial to generating a resistance mechanism in the liquid flowing process, and the reverse power action can consume part of kinetic energy of the liquid, so that sudden pressure fluctuation possibly generated in the fluid is relieved.

The invention provides a multi-motor pulse speed regulation control method and system, and relates to the technical field of motor control, the method comprises the steps that a target set quantity and a target motor identifier are obtained, a target driving parameter is obtained through conversion according to a parameter set associated with the target motor identifier, and the parameter set comprises an elastic modulus value and a stress relaxation coefficient of a peristaltic pump hose; real-time driving parameters are maintained for the multiple pulse output channels respectively, and refreshing is carried out at the synchronization moment; operating state feedback values of a peristaltic pump channel and a stirring motor channel are collected, a water hammer effect frequency component and an impeller passing frequency component are extracted, and correction is carried out based on the elastic parameters; and judging whether a cross-channel resonance judgment condition is met or not, and when the condition is met, determining a frequency correction amount and a phase correction amount and applying the correction amounts to at least one pulse output channel, thereby reducing the resonance risk and stabilizing the system operation.

The invention discloses a long-distance high-pressure water delivery pipeline water hammer and leakage monitoring and positioning test device, which comprises a water tank, a water outlet side experiment unit, a water return side main path experiment unit and a water return side branch experiment unit, and is characterized in that the water outlet side experiment unit and the water return side branch experiment unit are communicated with the water return side main path experiment unit; the water outlet side experiment unit, the water return side main path experiment unit and the water return side branch path experiment unit are all communicated with the water tank. The device solves the problem that tiny leakage is difficult to monitor in the high-pressure water delivery process in the existing related test experiment technology, and the problems that the water hammer experiment signal precision acquisition is insufficient and the water hammer experiment causes impact damage to equipment. The invention further discloses a using method of the long-distance high-pressure water conveying pipeline water hammer and leakage monitoring and positioning testing device.

The invention relates to the field of check valves, and particularly discloses a check valve with impact resistance, which comprises a valve seat, the valve seat is mounted in a pipeline, a control assembly matched with the valve seat is arranged in the pipeline, a friction assembly is arranged on the control assembly, and the friction assembly is connected with the valve seat. The pipeline is provided with a water storage assembly communicated with the friction assembly, and the water storage assembly is provided with an extrusion assembly used for pressurization. According to the invention, the water flow control capability can be realized, the slow closing function of the control assembly can be realized when the liquid is suddenly stopped, the phenomenon that the water flow is suddenly stopped can be reduced, when the water hammer effect is generated, the backflow water can be dispersed in time, the water flow impact force can be reduced, the water flow storage buffer effect can be realized, and the water flow impact can be further reduced; therefore, impact force of water flow on the pipeline, the valve seat and the control assembly is greatly reduced, abrasion is slowed down, safe and stable operation of a pipeline system is guaranteed, stability of the system is improved, and the service life of the system is prolonged.

The invention discloses a pipeline water pressure test device, and relates to the technical field of water pressure tests. The device comprises a mounting frame, wherein a first mounting plate is rotationally mounted on one side of the mounting frame; the third driving piece drives the connecting rod to slide, fluid shock waves are generated at the end, namely a flow channel, of water in the lower pipeline under the action of the cylindrical block so as to simulate the water hammer phenomenon, a water hammer eliminator is simulated through compressed air in the upper pipeline, water flow in the pipeline is buffered and adjusted, and the water hammer phenomenon is simulated. The influence of the water hammer phenomenon on the pipelines is reduced, after the impact experiment is completed, water injection pressurization can be conducted on the two communicated pipelines through the water injection pipe, air in the pipelines is discharged, then the two pipelines are separated through the plugging piece, and the two pressure detection mechanisms can detect the water pressure in the two pipelines respectively. According to the invention, a fluid shock wave simulation test can be carried out on the pipeline, the loading capacity and the sealing performance of the pipeline can be tested in a static pressurization mode, and the device is convenient and easy to use.

The invention discloses a fracture diagnosis method and device, and belongs to the technical field of oil and gas reservoir fracture exploitation, and the diagnosis method comprises the steps: building a water hammer equation set through a water hammer continuity equation, a water hammer motion equation and a liquid elasticity equation; solving the water hammer equation set to obtain a distribution equation of the water head, the flow velocity and the density of the middle well section; initial conditions in the studied wellbore are determined, and expressions of water head, flow and density distribution are obtained in combination with the distribution equation; coupling the water hammer equation set with a wellhead flow boundary condition and a well bottom crack boundary condition, and calculating to obtain a water hammer pressure curve; and crack parameters are determined by adjusting crack related parameters in the well bottom crack boundary conditions. The device comprises a memory for storing a computer program and a processor, wherein the program comprises the steps corresponding to the method. According to the method, the related parameters of the fractures after fracturing are rapidly diagnosed based on the water hammer pressure in the fracturing process, a basis is provided for design and modification of an oil and gas resource reservoir transformation scheme, and therefore the fracturing transformation effect is improved.

The invention provides a method, medium and system for calculating the extension length of a hydraulic fracturing main fracture, and belongs to the technical field of hydraulic fracturing. The method, medium and system for calculating the extension length of the hydraulic fracturing main fracture comprise the steps that a water hammer wave signal at the position of a well mouth after hydraulic fracturing pump stopping is obtained; performing cepstrum analysis on the water hammer wave signal; the minimum period of the positive pulse extreme point of the complex cepstrum curve is calculated, and the time of the water hammer wave moving from a wellhead to a bridge plug is obtained; calculating the average speed of movement of the water hammer waves in the well; performing linear trend removal processing on the local signal of the water hammer wave; fourier transform is carried out on the local signal after linear trend removal processing, and a water hammer wave local signal frequency spectrum is obtained; extracting a fundamental frequency corresponding to a maximum value point in the water hammer wave local signal spectrum as a response frequency in the main crack; according to the response frequency in the main fracture, the propagation time of the water hammer wave in the main fracture is calculated; and calculating the extension length of the main crack.

The invention belongs to the technical field of valves, and discloses a self-sealing anti-leakage valve which comprises a valve body and a connecting assembly. A buffer assembly; an adjusting assembly; a cleaning assembly and a cut-off assembly. According to the invention, by installing the cut-off assembly for auxiliary movement, when a piston block reaches a gap of a partition plate and continuously moves downwards, the piston block encounters the pressure of water flow in a right cavity to form a water hammer effect, and at the moment, three metal rods contact a groove ring and move downwards clockwise in a groove; the L-shaped rod can be pushed out under clockwise pushing of the cross plate and the oval groove, the shape of the L-shaped rod is a section conical surface, when the L-shaped rod continuously stretches out to be close to the bottom face of the partition plate, additional downward extension force can be provided for the piston block, the piston block can be assisted to be completely attached to and close a gap in the partition plate, and therefore the sealing effect is good. The problem that in the gradual closing process of an opening and closing piece of the valve, water flow can generate certain impact force on the opening and closing piece, and the water hammer phenomenon is generated to cause leakage is solved.

The invention discloses a linear multi-stage valve closing system for reducing a water hammer effect and a control method. The valve closing system comprises a controller module, a pipeline pressure monitoring module, a valve closing actuator module, a first-stage linear valve closing module, a second-stage linear valve closing module, a fault diagnosis module, a flow monitoring module and a user interface module, the pipeline pressure monitoring module, the fault diagnosis module, the user interface module, the flow monitoring module and the valve closing actuator module are all connected with the controller module. Through the arrangement of the first-stage linear valve closing module and the second-stage linear valve closing module, a proper valve closing mode can be selected according to the actual operation condition of a pipeline and different valve closing strategies, so that the water hammer suppression requirements under different pipeline pressure environments are met, the water hammer effect in a pipeline system is effectively reduced, and the water hammer suppression efficiency is improved. And through two-stage quick closing and slow closing control, the pressure impact of the valve and the pipeline is reduced, and the safety of a pipeline system is improved.

The invention relates to the technical field of water pump system control, and discloses a multi-water-pump parallel cooperative control method and system.The multi-water-pump parallel cooperative control method comprises the steps that multi-sensor data is collected and preprocessed, and a multi-dimensional health state feature vector is constructed; fault feature learning is carried out, fault category prototype representation is constructed in a feature space by using a prototype network, and the distance between different fault types is maximized through metric learning; establishing a transfer learning mechanism, and taking the existing water pump historical fault data as source domain knowledge to transfer to a water pump lacking fault mark data; analyzing the time sequence state change of the water pump, and predicting the fault probability and the remaining service life; the water hammer effect and the pressure fluctuation in the switching process are eliminated by accurately controlling the rotating speed change rate of each pump and the valve opening adjusting time sequence; through innovative small sample learning, knowledge migration and smooth switching control technologies, the problems of fault prediction and smooth switching in the multi-water-pump parallel system are solved.

The invention discloses a post-pumping air tank robustness collaborative design method considering hydraulic parameter time-varying characteristics, which comprises the following steps: defining a hydraulic parameter uncertainty fluctuation interval of a water delivery system in a full life cycle, and setting a body structure decision variable range of a post-pumping air tank; performing combined sampling in the water conservancy parameter uncertainty fluctuation interval and the body structure decision variable range by using a test design method to generate an initial sample set; performing steady-state and transient-state coupling simulation on the initial sample set, constructing a constant-flow operation condition of the water delivery system by using a hydraulic equation, updating a water pump working point and pipeline pressure distribution, performing transient simulation by using a characteristic line method to obtain a hydraulic response index, and training to obtain a water hammer response agent model; constructing a robustness optimization objective function based on failure probability constraint; and performing global optimization on the target function by using an intelligent optimization algorithm, calling the water hammer response agent model to perform random simulation, evaluating a failure probability, and outputting a target design scheme.

The invention relates to the technical field of pressure release valves, in particular to a fire-fighting pipeline linear adjusting pressure release valve and a method, the fire-fighting pipeline linear adjusting pressure release valve comprises a first valve body, and further comprises a third valve body, a second valve body, a third valve core assembly, a second valve core assembly and a third valve core assembly, the second valve body is fixedly connected to the top of the third valve body, and a second valve element assembly is connected to the interior of the second valve body; and the pressure regulating mechanism comprises a pressure assembly communicating with the water outlet end of the first valve body, and the top of the second valve body is connected with an elastic assembly. By arranging the pressure adjusting mechanism, a traditional single spring adjusting mode is broken through, the water pressure in the sealing cover and the mechanical pressure of the adjusting screw rod and the first spring are superposed to form a composite pressure relief threshold value, and a method for linearly and finely adjusting the pressure relief threshold value is added; incompressibility of a water medium is utilized, instantaneous pressure fluctuation is absorbed, fatigue failure of the spring under high-frequency impact is effectively avoided, and the device is suitable for starting and stopping of a fire pump or scenes where water hammers frequently occur.

The invention discloses a method for determining the position of a liquid inlet point by using a hydraulic fracturing water hammer signal. The method comprises the following steps: analyzing a main peak of a frequency spectrum through fast Fourier transform, and adaptively determining upper and lower cut-off frequencies of a Gaussian band-pass filter; an alpha-trimmed filter is used for removing peak noise, and an alpha-trimmed filter is used for removing peak noise; extracting a period T of the water hammer signal by adopting an autocorrelation algorithm; carrying out mean value removal processing on the signal after time domain filtering; short-time Fourier transform related parameters are adaptively determined according to the water attack signal period T, and short-time Fourier transform operation is executed to obtain a frequency domain two-dimensional matrix; performing Gaussian band-pass filtering and cepstrum transformation on each column of the two-dimensional matrix to construct a cepstrum matrix; and distinguishing the bridge plug and the liquid inlet points based on the symbolic characteristics of the cepstrum value, determining the actual position of each liquid inlet point in combination with time-depth conversion, and drawing a cepstrum cloud picture. Compared with the prior art, the method is improved in the aspects of adaptive filtering, period extraction accuracy and cepstrum cloud picture artifact removal, and has higher positioning precision and better real-time performance.

The invention discloses an underground pipe network monitoring method and system, and relates to the technical field of underground pipe network monitoring, and the method comprises the steps: arranging pressure sensors and flowmeters at key nodes of an underground pipe network, and collecting the pressure time sequence data and flow time sequence data of each node; calculating the hydraulic impedance of each pipe section according to the pressure time sequence data and the flow time sequence data, and constructing a hydraulic impedance space-time field covering a pipe network topology and a time dimension; extracting a space change trend and a time change trend based on the hydraulic impedance space-time field, fusing to generate a space-time gradient anomaly index, identifying a primary leakage suspicious pipe section according to the index, and forming a primary leakage alarm event; the method comprises the following steps: determining water hammer wave propagation characteristics in combination with a topological structure of an underground pipe network and pipe section physical attributes, performing water hammer wave propagation rule consistency verification on a plurality of alarm events by using time and position information of a primary leakage alarm event, and screening out an effective leakage event cluster conforming to physical propagation logic.

The invention provides a hydraulic ram pump system, comprising: a hydraulic ram pump body comprising a main body pipeline, a water escape valve, a water delivery valve and a pressure tank, the main body pipeline comprises a main body pipe and a third branch pipe which are communicated, the main body pipe is provided with a water inlet, a first interface and a second interface, the third branch pipe is provided with a third interface, the water escape valve is arranged at the first interface, and the pressure tank and the water delivery valve are arranged at the second interface; the piston assembly is hermetically mounted on the third branch pipe in a reciprocating motion manner from the third interface; the piston assembly, the transmission conversion device, the rotation transmission device and a rotor of the power generation device are sequentially in transmission connection, and the transmission conversion device is arranged to convert reciprocating linear movement of the piston assembly into one-way rotation of the rotation transmission device. The rotation transmission device is arranged to drive the rotor of the power generation device to rotate unidirectionally. According to the water hammer pump system, when the water hammer pump body continuously operates, the piston assembly can periodically do reciprocating linear movement, and power generation of the power generation device can be achieved.

The utility model provides an open-loop controlled multifunctional hydraulic pulse test bench, which comprises a storage oil tank, an oil supply pump machine, a reversing valve, a pressurizing oil cylinder and an oil supplementing overflow valve, according to the test bed, a large amount of oil flows into a system at the moment that an oil way is opened by a reversing valve, and due to the fact that an overflow valve has a lag phenomenon in response, oil pressure instantaneously generates an overshoot peak value, pressure in a pipeline rapidly rises and a pressure peak appears, then the overflow valve is conducted, the oil is guided out along the overflow valve, and the pressure in the system is reduced to the set pressure of the overflow valve; water hammer waves and rectangular waves of various waveforms and frequency bands can be generated by adjusting the diameter of a variable damping hole of the one-way throttle valve and the rotating speed of the motor, so that the hydraulic pulse test bed can form hydraulic pulse waveforms of various waveforms and frequency bands; the set pressure of the overflow valve is increased, meanwhile, the travel switch loses efficacy, and when the reversing valve is located at the right position all the time, a damage test can be conducted on the hydraulic pipeline to measure the maximum pressure value capable of being borne by a tested piece.

The invention relates to the technical field of valves, in particular to a combined high-temperature and high-pressure valve which comprises a valve body, a valve seat and a valve element. The flow slowing mechanism is used for slowing down the flow speed of fluid, and the outer wall of the flow slowing mechanism is fixedly connected with the inner wall of the valve body; the check mechanism is used for preventing fluid from flowing back, and the outer wall of the check mechanism is fixedly connected with the inner wall of the side, away from the flow slowing mechanism, of the valve body. By arranging the flow slowing mechanism, in the flowing process of the fluid, the fluid impacts the flow baffle and flows through a gap between the flow baffle and the flow baffle ring, so that the flow direction of the fluid is disturbed, and therefore the flow direction of the fluid is disturbed; by arranging the flow disturbing assembly, the flow velocity of the fluid can be further reduced, impurities doped in the fluid can be filtered out, the flow velocity of the fluid can be further reduced by arranging the flow disturbing assembly, the valve element is protected, and the valve element is prevented from being damaged due to the water hammer effect at the moment when the valve is opened.

According to the correction calculation method for the rigid water hammer turbine model coefficient, the flow coefficient of the water turbine is defined by rated working condition parameters according to the concept of a water head of the water turbine, the flow is rewritten into a function of the guide vane opening degree and the water head of the water turbine, and the problem that the flow measurement difficulty of a hydropower station is large is solved; establishing a water turbine linearization model by adopting a water turbine output equation recommended by IEEE Working Group, and constructing an increment linearization model from the guide vane opening to the water turbine output in combination with a water turbine flow linearization equation; the influence of pipeline hydraulic loss is introduced into a rigid water attack transfer function, a water turbine output transfer function model under the pipeline rigid water attack is established, the model has the same form as a PSD-BPA water turbine model of the China University of Electricity, and a model correction coefficient can be directly calculated, so that the parameter calculation of the model is simplified, and the application is convenient.

The invention relates to the field of fluid pipeline system safety and intelligent control, and provides a water hammer pressure prediction and active suppression method and system. The method comprises the following steps: acquiring a multi-dimensional digital signal flow, and generating a window data matrix sequence through sliding window segmentation and dimensionless; image coding is carried out to form a spatiotemporal feature sequence, the spatiotemporal feature sequence is processed by a double-branch spatiotemporal prediction network, and a prediction feature spectrum sequence is output and decoded to form a prediction waveform matrix; future risk indexes and morphological characteristics are extracted and spliced with the multi-dimensional digital signal flow to form a prediction enhancement state vector, and the prediction enhancement state vector is input into a strategy network to generate valve action control parameters; and a target valve opening curve is decoded, a composite control signal is obtained through feedforward-feedback composite control, actual response data flow and historical data packaging are collected, and a prediction network and a strategy network are updated online through mixed priority screening. According to the method, prospective and self-adaptive water hammer prediction and active suppression are realized, the pressure evolution trend of a pipeline system is informed, and decision support is provided for safe operation of a fluid pipe network.

The invention relates to the technical field of building engineering, in particular to a coupling carbon reduction optimization method for a building water supply and drainage system. The method comprises the following steps: acquiring operation data of a building drainage system; carrying out pump station working condition abnormity analysis based on the building drainage system operation data, and generating pump station working condition abnormity data; extracting a rainwater recovery path according to the building drainage system operation data; performing rainwater recovery pipe network backflow analysis based on the rainwater recovery path to obtain pipe network backflow data; the pipe network bearing pressure is evaluated according to the pipe network backflow data; performing leakage risk assessment based on the pipe network bearing pressure to obtain a pipe network leakage risk; the pump station start-stop times are counted according to the pump station working condition abnormal data; performing water hammer effect analysis according to the start-stop times of the pump station to obtain water hammer effect data; and according to the water hammer effect data and the pipe network leakage risk, identifying a fragile pipe network to obtain fragile pipe network data. The energy efficiency and carbon emission management of the building drainage system are optimized based on the building engineering technology, and the energy-saving and carbon-reducing efficiency is improved.

The utility model discloses a fracturing wellhead water hammer wave tester, which relates to the technical field of petroleum physical exploration, and comprises a wellhead oil pipe buckle joint, a copper gasket, a pressure gauge and a connecting plug, the wellhead oil pipe buckle joint is connected with a wellhead; the copper gasket is arranged between the wellhead oil pipe buckling head and the pressure gauge and is used for sealing and buffering between the wellhead oil pipe buckling head and the pressure gauge; the pressure gauge is used for monitoring wellhead pressure changes in real time; the connecting plug is used for connecting the pressure gauge with an external data processing system. Based on the tester provided by the invention, the pressure change generated during underground fracturing can be accurately and reliably monitored.

The invention relates to the field of hydraulic engineering, and provides a one-way tower theoretical scheme optimization method and system based on an intelligent algorithm, a terminal and a medium, and the method comprises the following steps: collecting pipeline system parameters, and deducing a one-way tower theoretical protection scheme based on a water hammer theory; all theoretical values in the unidirectional tower theoretical protection scheme are extracted, corresponding data of pipeline characteristic parameters and design parameters are generated, a training sample library is constructed, a prediction model is trained through a neural network algorithm, and nonlinear mapping prediction from the pipeline characteristic parameters to the design parameters is achieved; and a target function is constructed based on the output of the prediction model, global optimization is carried out by using the prediction model in combination with an optimization algorithm, and a one-way tower volume and water supplementing amount global collaborative optimization scheme which not only meets the pipeline pressure bearing standard but also minimizes an original target item is obtained. The method can solve the problems of lack of accurate optimization and easy falling into a local optimal solution in the prior art.

The invention discloses a shunt check valve, and relates to the technical field of check valves. The check valve comprises a valve body, a water inlet pipe and a water outlet pipe are arranged at the two ends of the valve body respectively, a mounting shaft is rotationally connected to the inner wall of one side of the valve body, a fixing rod is fixedly connected to the circumference of the mounting shaft, and a valve clack is fixedly mounted at the other end of the fixing rod; one end of the mounting shaft rotationally penetrates through the valve body and is fixedly connected with a fixing shaft, the circumference of the fixing shaft is fixedly connected with a swing arm, the outer wall of one side of the valve body is fixedly connected with a connecting shaft, and one end of the connecting shaft is rotationally connected with a guide cylinder. By means of flowing of hydraulic oil, the final closing speed of the valve clack is reduced, the water hammer effect is prevented, the service life of the valve body is prolonged, meanwhile, upward impact force of the spring on the valve clack is buffered, the valve clack is prevented from impacting the valve body, the service life of the valve clack and the service life of the valve body are prolonged, the reset state of the valve clack can be observed through the pointer, and safety is improved. The situation that the valve clack is not closed in place is avoided, and workers are reminded to overhaul.

The present invention discloses a system comprising an actuation valve for receiving a first pressurized fluid, a piston in communication with the actuation valve, and a flow restrictor for controlling the flow of a second pressurized fluid from the piston. The flow restrictor may vent to ambient pressure and the piston may act as a pinch valve on at least one of an irrigation line.

The invention discloses an electro-hydrogen water coupling system planning method and device considering multi-energy flow dynamic characteristics, and the method comprises the steps: representing the slow dynamic characteristics of gas and liquid in a coupling system pipeline through a hyperbolic isothermal Euler partial differential equation and a hyperbolic water hammer partial differential equation, and considering the AC power flow characteristics of a power distribution network; electric hydrogen water multi-energy flow constraint is obtained; obtaining a decision independent uncertainty scene set according to a preset limited scene set; obtaining a decision dependence uncertainty set according to the hydrogenation demand induction effect; taking the planning cost constraint as a feasible region of a first stage, taking the coupled system operation constraint and the electro-hydrogen water multi-energy flow constraint as a feasible region of a second stage, and constructing a two-stage decision-dependent robust planning model of the coupled system; and solving the two-stage decision dependence robust programming model to obtain a site selection and capacity scheme of the coupled system.

The invention relates to the field of shear tests, in particular to a shear test driving oil cylinder which comprises a splitting mechanism used for providing a test environment, a fixing seat and an external mechanism, the external mechanism is provided with the fixing seat used for installing a test block, and the upper side of the fixing seat is provided with a splitting mechanism used for splitting the test block. An oil cylinder mechanism used for providing power is installed at the upper end of the splitting mechanism, the adjusting mechanism is used for adjusting the internal sealing environment of the oil cylinder mechanism and providing stress release for the oil cylinder mechanism, the oil cylinder mechanism comprises an oil cylinder body, and a sealing plug is arranged at an opening in the bottom of the oil cylinder body; the piston rod penetrates through the sealing plug and is connected with a pressure applying piston assembly located in the center inside the oil cylinder body. The device is used for solving the technical problem that a sealing ring of a piston part is damaged due to instant impact force caused by a water hammer effect of oil liquid due to instant pressure loss of the piston part in a pressure applying oil cylinder at the top after bottom concrete is instantly cracked in a high-pressure environment shear test process.