1051 results about "Globe valve" patented technology

The invention discloses a high-precision polishing and grinding device for machining a valve element of a stop valve, and belongs to the technical field of valve element polishing machining. The high-precision polishing and grinding device comprises an equipment base placed in a workshop, a polishing motor is installed on the outer side of the equipment base through a frame body in a lifting mode, and a polishing head is fixedly installed at the output end of the polishing motor; a polishing seat is further fixedly mounted above the equipment base, a center shaft is rotatably mounted on the inner side of the upper portion of the polishing seat, the center shaft is in transmission connection with a polishing head through a linkage transmission assembly, and side shafts rotatably connected with the polishing seat are evenly arranged on the outer side of the center shaft. The center shaft and the side shafts are in transmission connection through transmission gear sets, and clamping and positioning assemblies are arranged at the tops of the side shafts. According to the high-precision polishing and grinding device for machining the valve element of the stop valve, synchronous and automatic positioning and polishing of the valve element at multiple stations can be achieved, the polishing efficiency is high, and polishing liquid and metal dust can be efficiently treated and recycled in the polishing process.

The invention discloses a special bromine corrugated pipe stop valve with a sealing detection function, and relates to the technical field of stop valves, the special bromine corrugated pipe stop valve comprises a valve body, the side wall of the valve body is fixedly connected with a valve cover through a bolt, the inner wall of the valve cover is slidably connected with a valve rod, and the inner wall of the valve cover is rotatably connected with a rotating cylinder; a connecting ring plate is slidably connected to the inner wall of the rotating cylinder, and a first cleaning brush is fixedly connected to the side wall of the connecting ring plate. By installing the rotating cylinder, the connecting ring plate, the first cleaning brush and the like, the automatic cleaning function on the surface of the corrugated pipe is achieved, the problems of crystal deposition and impurity attachment on the surface of the corrugated pipe are solved, the service life of the valve is prolonged, and the sealing reliability of the valve is improved.

The invention provides an intelligent grouting system for a water conservancy project and a control algorithm, and the system comprises a control cabinet which is internally integrated with at least two independent grouting pipelines; the control module is used for mode selection, parameter input, state display and instruction issuing; the data acquisition module is used for acquiring grouting data of a grouting pipeline and transmitting the grouting data to the control module, and the grouting data comprises pressure, flow and internal slurry density data; the execution module comprises a stop valve used for controlling on-off of grout in the grouting pipeline and a flow adjusting valve used for controlling the flow in the grouting pipeline. The control module comprises a function selection unit which is used for responding to user operation and switching among three working modes of drilling flushing, water pressing testing and grouting; the parameter input unit is configured with a standardized parameter input interface and has a parameter storing and calling function; according to the invention, the control precision and efficiency can be obviously improved.

The invention relates to a variable topology heat management method for overcharge of a vehicle pile cooperative heavy truck, and solves the problem that refrigeration of a cooling unit matched with a current vehicle cannot meet high-rate overcharge of a battery. Comprising two three-way valves, a compensation water tank, a water supplementing stop valve, an exhaust stop valve and a liquid cooling socket, the battery cooling system is divided into an on-vehicle liquid cooling loop and an off-vehicle liquid cooling loop by controlling the states of the two three-way valves, a first opening of each three-way valve is connected with a cooling unit, a second opening of each three-way valve is connected with a battery, and a third opening of each three-way valve is connected with the liquid cooling socket, cooling liquid flows back to the cooling unit after flowing through the three-way valve I; after the three-way valve II is arranged behind the water outlet of the cooling unit, the cooling liquid flows through the three-way valve II after flowing out of the cooling unit; the compensation water tank is arranged at the highest point of the whole cooling system, the water supplementing stop valve is arranged in the water supplementing loop, and the exhaust stop valve is arranged in the exhaust pipeline. And the liquid cooling socket is arranged between the two three-way valves. According to the invention, high-rate charging of the vehicle can be realized.

The invention relates to the technical field of digital twinning, and particularly discloses a digital twinning-based stop valve intelligent control method, which comprises the following steps that a digital twinning model of a pipe network system is decomposed into a plurality of sub-models, and each sub-model corresponds to a stop valve and a corresponding associated pipe network area; monitoring data of a single stop valve are obtained, the monitoring data are transmitted to the corresponding sub-model, and the sub-model updates the model state according to the monitoring data; exchanging monitoring data among the sub-models to form a global data set, and calculating the opening degree adjustment amount of the stop valve based on the sub-models with updated model states and the global data set; and the opening degree adjustment amount is sent to a stop valve actuator, and the actuator drives the stop valve to act. According to the method, the overall hydraulic coupling state of the pipe network is sensed by dividing associated areas and exchanging data; and pressure fluctuation and hydraulic unbalance are effectively inhibited based on cooperative calculation of the valve opening adjustment amount.

The present invention relates to a header configuration block for a hydrocarbon well comprising a header configuration block housing having a plurality of transversal bores each in fluid connection with a discrete longitudinal main bore. At least one cut off valve is located in each transversal bore. A first connecting surface is parallel to and similar with a second connecting surface, whereby the first connecting surface and the second connecting surface are adapted to be connected to at least one further similar header configuration block. The invention also relates to a manifold branch configuration block and a well fluid manifold assembled of header configuration blocks, branch configuration blocks and flow line configuration blocks.

The application discloses a new energy special filtering type corrugated pipe stop valve, and aims to solve the problem of poor sealing effect between a valve core and a valve seat in the prior art. The application solves the above technical problem through the following technical scheme: comprising a valve body and a valve cover, the valve body and the valve cover cooperate to form a cavity, the two sides of the valve body are respectively provided with a water inlet channel and a water outlet channel which are communicated with the cavity, the water inlet channel is connected with an inclined blowdown channel, and the blowdown channel is communicated with the cavity through a vertical channel; a valve rod assembly comprising a valve rod, the valve rod is arranged in the valve cover, and the bottom of the valve rod is provided with a ball head valve core; a filter assembly comprising a filter screen arranged in the blowdown channel. Through the arrangement of the filter screen, the medium can be filtered, the solid particles are reduced to adhere to the sealing abutting ring, the sealing performance between the ball head valve core and the sealing abutting ring is improved, and the sealing effect between the ball head valve core and the valve seat is improved.

The utility model discloses a compressor performance test system, which is characterized in that an air inlet of an exhaust pipeline stop valve is connected with a refrigerant outlet of a tested compressor, and an air outlet is connected with an inlet of a gas flow meter; an outlet of the gas flowmeter is connected with a gas inlet of the exhaust pressure regulating valve The exhaust pressure regulating valve air outlet is connected with the suction pressure regulating valve air inlet and the condenser first air inlet; the condenser is provided with an internal circulation electric heating assembly, a first air outlet is connected with an air inlet of the air suction pressure regulating valve, and a first liquid outlet is connected with a liquid inlet in the side wall of the lower portion of the liquid storage device. The liquid storage device is connected with the condenser in parallel, a first gas outlet is connected with a first gas inlet of the condenser, a second gas outlet is connected with a gas inlet of the gas cooler through the suction temperature regulating valve, and the liquid level is the same as that of the condenser; the suction pressure regulating valve gas outlet is connected with the gas cooler gas inlet; a gas outlet of the gas cooler is connected with a refrigerant inlet of the tested compressor through a compressor suction pipeline stop valve.

The application provides an integrated streamlined hydrogen filling gun capable of real-time monitoring and flow regulation and a control method, relates to the field of high-pressure hydrogen filling of a hydrogen storage system of a hydrogen fuel cell vehicle, and comprises a main valve body, a stop valve, a first filter, a redundant one-way valve, a flow regulating valve, a second filter, a temperature sensor, a pressure sensor and a flow sensor. The temperature sensor is used for monitoring the temperature T in the valve body in real time. When T < T1, the pressure sensor is started to monitor the real-time pressure. When T1 <= T < T2, cooling is started until T < T1. When the real-time pressure P < P1, the flow sensor is started to monitor the pre-filling flow. When the pre-filling flow Q is in a first flow threshold range, hydrogen is filled at a first flow. When P1 <= P < P2, hydrogen is filled at a second flow. When P2 <= P < P3, hydrogen is filled at a third flow. When P = P3, the stop valve is closed to stop hydrogen filling. The hydrogen filling gun adopts a streamlined valve body, has high integration, can adapt to filling requirements of multiple pressure grades, and is safe and efficient.

The utility model discloses a two-stage stroke stop valve which comprises a valve body, and two valve body inner cavities are arranged in the valve body side by side. A first valve seat and a second valve seat are sequentially arranged in an inner cavity of the valve body from right to left, and the first valve seat and the second valve seat are arranged in a spaced mode. A first valve element is arranged in a center through hole of the first valve seat in a sliding mode. A second valve element is arranged in a central through hole of the second valve seat in a sliding mode. An ejector rod for driving the first valve element and the second valve element to act is arranged at the right end of the inner cavity of the valve body in a sliding mode. Through the first valve element and the second valve element which are coaxially arranged, the sealing performance of the valve body is guaranteed through two-stage strokes of the first valve element and the second valve element when the valve is opened and closed, the problem that an existing stop valve is short in service life after sealing failure due to the fact that only one-stage sealing is arranged is solved, the sealing performance of the stop valve is improved, and the service life of the stop valve is prolonged. And the service life of the stop valve is prolonged.

The utility model discloses a stop valve, including the valve body, the flow channel is formed in the valve body, the valve body is provided with the valve clack that carries out the cut -off of flow channel, and its characterized is: the valve body is provided with the control flow cover, the control flow cover is located the valve clack outer periphery of sliding, the control flow cover is provided with a plurality of and each other sliding setting, and the control flow cover all is provided with the control flow groove, the control flow groove is reduced gradually from the outermost control flow cover to the innermost control flow cover, when the valve clack drive control flow cover coincides, the valve clack seals the control flow groove, and the control flow cover is provided with the restriction piece. The utility model has the advantages and effects as follows: through setting up a plurality of control flow cover, can effectively control the flow of valve, so that the valve is opened, and the impact that the valve clack receives can be smaller.

The utility model relates to the technical field of stop valves, in particular to a stop valve hand wheel lengthening device which comprises a stop valve body, a base is fixedly installed on the stop valve body, a support is fixedly installed on the base, a hand wheel body is rotatably installed on the base, and the lower end of the hand wheel body is fixedly connected with a sealing plate. The hand wheel body is fixedly connected with a rotating block with a T-shaped cross section, and the rotating block is connected with the base through a first torsion spring; a limiting opening is formed in the support, a lengthening rod is slidably installed in the limiting opening, the lengthening rod is connected with the rotating block through a pull rope, and a limiting assembly is arranged on the lengthening rod. When the distance between the operable position and the hand wheel body is far, an operator can conveniently adjust the angle of the sealing plate through the reinforcing rod, opening or closing of a valve can be conveniently and rapidly adjusted, and use of the stop valve is facilitated.

The invention discloses an air conditioner outdoor unit, a refrigerant filling method and device and a storage medium. The air conditioner outdoor unit comprises a compressor, a one-way valve, a heat exchanger and a first stop valve, an output port of the compressor is connected with the heat exchanger through the one-way valve, an input port of the compressor is connected with the first stop valve, and a pipeline between the one-way valve and the heat exchanger is a first pipeline. The pipeline between the compressor and the first stop valve is a second pipeline, and refrigerants are arranged in the first pipeline, the second pipeline and the compressor. Under the condition of the same refrigerant injection amount, the air conditioner outdoor unit can store refrigerants in the first pipeline, the second pipeline and the compressor separately, so that in the process of transporting the air conditioner outdoor unit, the pressure generated when the refrigerants in the air conditioner outdoor unit are subjected to high temperature is lower than the pressure bearing capacity of the refrigerant pipeline; and pipe explosion can be reduced to a certain extent, and damage to the outdoor unit of the air conditioner is avoided.

The utility model provides a closed sampling valve with a corrosion-resistant function, which comprises a sampling valve, the sampling valve consists of a stop valve and a sampling mechanism, the sampling mechanism is connected with the outlet end of the stop valve, the stop valve comprises a valve body, a connecting flange, a valve handle and a valve core, and a cleaning mechanism is fixedly mounted at the bottom of the valve body. The closed sampling valve is used for closed sampling of media, the whole sampling process is operated in a closed environment, the pollution problem caused by medium leakage can be avoided, the closed sampling valve is particularly suitable for closed sampling of volatile and corrosive media, the cleaning mechanism is arranged and can be used for discharging residual media in the valve body, and the sampling efficiency is improved. According to the closed sampling valve, the problem of corrosion of the sampling valve caused by medium residues is avoided, the sampling mechanism is arranged, sealing connection of the sampling bottle can be facilitated, the leakage problem in the sampling process is prevented, meanwhile, the sampling pipe is plugged after sampling, dust is prevented from entering the sampling pipe to affect subsequent sampling operation, and the subsequent sampling precision of the closed sampling valve is improved.

1. The name of the design product: magnetic locking filter double ball valve. 2. The use of the design product: for cutting off, distributing and changing the flow of medium. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.

The water heating stop valve comprises a valve body, a valve rod and a valve clack, the valve rod comprises a rotating section and a sliding section, the valve body is provided with a containing cavity, the cavity wall of the containing cavity is provided with a liquid outlet channel, the valve body is provided with a liquid inlet channel, the liquid inlet channel is located below the containing cavity, the cavity bottom of the containing cavity is provided with a communicating hole, and the communicating hole communicates with the liquid inlet channel; the sliding section is embedded in the containing cavity in a sliding mode, the valve clack is connected to the lower end of the sliding section and used for sealing the communicating hole, and the rotating section is rotationally connected to the valve body and is in threaded connection with the sliding section. The rotating section is rotationally connected to the valve body, the rotating section and the valve body are kept relatively fixed in the direction of the rotating axis of the valve rod, the rotating section is in threaded connection with the sliding section, the sliding section is driven to slide, the valve clack is driven to slide, communication and closing of the communication hole are achieved, and when the stop valve is adjusted, the distance between the end, away from the sliding section, of the rotating section and the valve body is kept constant; the use requirement when the installation space of the stop valve is small is met, and the application range of the stop valve is widened.

The invention discloses a stop valve welding assembly method, which relates to the technical field of stop valve production and manufacturing, and comprises the following steps of welding, water-based cleaning, A unit assembly, water detection, drying, C unit assembly and packaging. A valve body and connecting pipe welding procedure and a valve body assembling procedure are organically integrated, so that the two different procedures of stop valve welding and assembling are sequentially and adjacently arranged and distributed in a straight line in the same workshop, different devices are tightly connected, the intermediate turnover time is shortened, the production efficiency of stop valves is improved, and the production cost is reduced.

The invention discloses a molten salt check valve helium leak detection device and method, and belongs to the technical field of molten salt check valves. The problems that in the prior art, leakage rate detection is inaccurate, and the leakage position is difficult to find are solved. According to the technical scheme, a helium source is sequentially connected with a first pressure gauge and a spray gun, the left side of a fused salt check valve is connected with a helium mass spectrometer leak detector and an auxiliary vacuum pump, and the right side of the fused salt check valve is sequentially connected with a second pressure gauge, a second electric stop valve, a second quick cut-off valve and a second release valve; and a calibration leak hole is formed in the fused salt check valve. According to different use conditions, a proper detection method can be selected to determine the leakage amount of a leakage point, and if a vacuum leakage detection test exceeds the standard, the method is continued to find out the position of the leakage point, so that repair is facilitated; detection cost is low, and equipment is simple; detection results are visual, and leakage positions are easy to judge.

The utility model provides a valve filter, relates to the technical field of valves, and solves the problems that the traditional valve filter is not timely in desilting and inconvenient to replace, the device comprises pressure detection mechanisms, a control module and a control mechanism, the pressure detection mechanisms are provided with a water inlet and a water outlet which are communicated with a stop valve and are arranged on two sides of the basket type stop valve; the control module is electrically connected with the pressure detection mechanism and the control mechanism, and the control mechanism is arranged at the position of a dredging opening of the stop valve. According to the utility model, the control module is used for realizing the numerical value collection, analysis and judgment of the pressure difference and the dredging execution, the automatic cleaning of the valve filter is realized, the manual inspection frequency is greatly reduced, and the labor cost is reduced.

The invention belongs to the technical field of car washing liquid production equipment, discloses a car washing liquid production device, and aims to solve the problems that in the prior art, a mode of sequentially feeding and mixing a plurality of additives is mostly adopted, the additives need to be weighed and fed firstly, the powdery additives are prone to caking in the feeding process, the liquid additives are prone to layering, and the production efficiency is high. According to the technical scheme, the vehicle washing liquid mixing device comprises a main mixing tank, a plurality of supporting legs are fixedly installed on the bottom face of the main mixing tank, a plurality of premixing tanks are arranged above the main mixing tank, and discharging pipes with stop valves are fixedly installed on the lower portions of the peripheries of the main mixing tank and the premixing tanks; according to the present invention, the production mode of the main mixing after the premixing in the separate tanks is adopted, such that various additives can be subjected to the premixing treatment, and the main mixing is performed after the premixing in the premixing grid so as to avoid the caking and layering problem of the additives during the main mixing.

The invention discloses a performance testing device and a performance evaluation method of a greenhouse gas analyzer. The device comprises a multi-port selector valve, a plurality of input ports of the multi-port selector valve are respectively connected with first to nth input gas paths, and an output port of the multi-port selector valve is respectively connected with a gas path of an instrument to be tested and a gas path of a standard instrument through a three-way interface; the to-be-measured instrument gas path and the standard instrument gas path are the same in gas path structure and comprise a stop valve and a three-way connector which are connected in sequence, one of the three-way connectors is used for being connected with the rotor flow meter, the other one of the three-way connectors is used for being connected with the mass flow controller, and the mass flow controller is used for being connected with the to-be-measured instrument or the standard instrument. The test requirements of performance evaluation of the greenhouse gas analyzer, including calibration and linear test, repeatability and drift test, water vapor correction test and the like, can be met, relatively complex matrix effect test and comparison test between instruments can also be performed, and the condition that a test pretreatment device is repeatedly built in the long-term test process is avoided.

The utility model relates to a self-sealing high-temperature high-pressure stop valve, which relates to the technical field of valves and comprises an inflow pipe, an outflow pipe, a valve body, a driving mechanism and a pressure reducing mechanism, the inflow pipe and the outflow pipe are both communicated with the valve body, and the pressure reducing mechanism comprises a valve clack, a pressure reducing plate and a limiting column. The pressure reducing plate is fixedly installed at the joint of the inflow pipe and the valve body, a plurality of pressure relief holes are formed in the pressure reducing plate, the limiting column is arranged on the pressure reducing plate, a limiting hole is formed in the valve clack, the valve clack is slidably connected to the limiting column through the limiting hole, the driving mechanism is arranged on the valve body, and the valve clack is arranged on the valve body. And the driving mechanism is used for driving the valve clack to move in the valve body. Impact force of media on the valve body mechanism can be weakened, closing torque of the valve body mechanism is reduced, and the valve body mechanism is convenient to use.

The invention discloses a corrosion-resistant self-compensation sealing stop valve, and relates to the technical field of valves, the corrosion-resistant self-compensation sealing stop valve comprises a valve body, an elastic sealing seat, a valve core and a self-compensation sealing control assembly, and the control assembly comprises a parameter acquisition module, a signal preprocessing module, a main control decision module, an electric control execution module and a feedback verification module. In the working process, multi-dimensional signals such as sealing abrasion and medium characteristics are collected firstly, after anti-interference and standardization processing is conducted, the main control decision module calculates the sealing compensation amount through an algorithm, correction is conducted in combination with the corrosion working condition, then a driving instruction is generated through abnormal fault-tolerant processing, and the electric control execution module adjusts the sealing gap and pressure through the electric push rod and the micro air pump. And the feedback verification module performs real-time feedback to form a closed loop. The valve achieves sealing self-adaptive compensation, is high in corrosion resistance and interference resistance, accurate and stable in sealing, capable of prolonging the service life of core components, adaptive to complex working conditions and high in practicability.

A system and method for a hydraulic swing system of a machine to prevent drift without engaging a swing brake is described. The hydraulic swing system includes a pump powered by a motive element such as an engine and provides a swing motor for rotating the chassis of the machine relative to the undercarriage. The swing system includes a control valve on a first path between the pump and the motor and a second control valve on a second path. The swing system further includes a blocking valve to blocking hydraulic fluid flow and thereby preventing drift engaged when the system is in neutral and below a threshold rotation rate.

The utility model relates to a kind of online backwash ceramic filter tank systems.Electromagnetic reversing valve and electromagnetic stop valve are set up one-to-one with each suction tube, two openings of each electromagnetic reversing valve are connected with suction tube, another opening is connected with the import of suction pump, with the first valve position of liquid in suction pump flowing to suction tube, and the second valve position of reverse flow;Electromagnetic stop valve includes the import of acid outlet connected with pickling pump and the outlet of acid outlet connected with corresponding suction tube, with opening valve position and closing valve position;Controller is controlled connection with suction pump, pickling pump, each electromagnetic reversing valve and each electromagnetic stop valve respectively, to control at least one carbon ceramic filter plate in backwash state, corresponding electromagnetic reversing valve switches to first valve position, corresponding electromagnetic stop valve is opening valve position;Control at least one ceramic filter plate in filtration state, corresponding electromagnetic reversing valve switches to second valve position, corresponding electromagnetic stop valve is closing valve position.On-line high-efficiency backwash can be achieved.

The invention relates to the technical field of flue gas continuous emission monitoring systems, in particular to a gas path isolation and flow optimization system for flue gas CEMS full-process calibration. According to the technical scheme, the gas path isolation and flow optimization system for flue gas CEMS full-process calibration comprises a gas path isolation module, a pretreatment gas path optimization module, a cabinet panel control module, an analyzer replacement module and a phosphoric acid titration quality control module, the gas path isolation module is introduced, the pneumatic stop valve unit is integrated in the probe, automatic blocking of the probe and a flue gas path in the calibration process is achieved, and before full-process calibration is started, a control system sends an instruction to drive a pneumatic actuator, a valve body is rapidly closed, and physical connection between the probe and a flue is cut off; all standard gas flows to an analysis system through the sampling probe rod, so that a standard gas dissipation path is eliminated fundamentally, the quantity of standard gas actually participating in reaction in a calibration gas path reaches a theoretical design value, and the accuracy of core indexes such as indication error and repeatability is remarkably improved.

The invention relates to a rapid outburst elimination system for cross-cut coal uncovering. The rapid outburst elimination system comprises an extraction pipe, an injection pipe and an ultrasonic transducer which are arranged in a drill hole. The outer end of the injection pipe is connected with a gas injection stop valve, a pressure pump, a heater and a carbon dioxide storage tank through an injection pipeline, a four-way valve is arranged on the injection pipeline between the injection pipe and the gas injection stop valve, and the four-way valve is connected with a temperature sensor and a gas injection pressure gauge; the outer end of the extraction pipe is connected with a heat exchanger, a gas separation tower, a pressure adjusting device and an extract separation tower through an extraction pipeline; the upper end of the extract separation tower is connected with a carbon dioxide storage tank through a circulating pipeline; and the outer end of the ultrasonic transducer is electrically connected with the ultrasonic generator. According to the ultrasonic-assisted supercritical carbon dioxide cyclic extraction anti-reflection technology, organic matters in the coal seam can be extracted through supercritical carbon dioxide, so that the permeability of the coal seam is improved, and the technology is reasonable in structure, simple in device, convenient to implement, safe and reliable.

The embodiment of the utility model discloses an in-phase peristaltic pump which is characterized in that a stop valve is arranged on the basis of an existing peristaltic pump, the stop valve is arranged outside a pump head, the stop valve is matched with the position of a roller in the pump head, and the stop valve is started at proper time, so that liquid is blocked in the pump head adjusting process; and the initial phases of the pump head are completely the same when the liquid is quantitatively output every time. In the liquid filling process, the release action that the hose is pressed by the rolling wheel is avoided, the influence of pulsation on quantitative transmission precision is eliminated, and the filling precision is improved. According to the scheme, the original advantages of cleanliness, easy maintenance, good controllability and the like of the peristaltic pump are reserved, meanwhile, accurate quantitative transmission of the peristaltic pump is achieved, the filling efficiency of the peristaltic pump is improved while the filling precision is improved, and the advantages of being low in cost and wide in adaptability are achieved.

The invention discloses a quick dismounting device and method for a hydraulic throttling resistance part, relates to the technical field of nuclear power plant mounting devices, and aims to solve the problem of low calibration efficiency caused by long time consumption in the replacement process of an existing throttling part. The device comprises a hydraulic cylinder arranged on the lower portion of a fixing support, an inlet module is movably installed in the middle of the portion, above the hydraulic cylinder, of the fixing support, an outlet module is installed on the upper portion of the fixing support, a throttling resistance piece sleeve is installed between the inlet module and the outlet module, and an inlet stop valve is arranged on the inlet module; the outlet module is provided with an outlet stop valve, and the inlet module and the outlet module are provided with measuring instruments. By operating the device, the mounting and dismounting speed of the throttling resistance piece can be increased, and the calibration efficiency is improved.