809 results about "Sampling valve" patented technology

A valve for connecting a fluid sampling device to a fluid source is provided that includes a body adapted to be secured to the fluid source and a valve member moveably disposed within the body. The body includes a coupling interface configured to sealingly mate with the sampling device. The valve member is actuated by the sampling device during attachment of the sampling device to the valve body. The sampling device actuated valve member is moveable between a first position in which a flow path between the fluid source and the sampling device is closed and a second position in which the flow path between the fluid source and the sampling device is open. When the fluid flow path is open, the sampling device can withdraw a fluid sample for inspection and return the fluid sample to the fluid source without exposing the fluid to the surrounding environment.

A fluid-sampling method and apparatus are disclosed. The apparatus includes a valve assembly, an overflow chamber assembly, a vacuum assembly and a sample bottle mounting assembly in particular arrangements. In certain preferred embodiments the overflow chamber assembly has an inner vessel, preferably a standpipe, within an outer vessel which forms an overflow chamber in which fluid from the standpipe can be viewed. The valve assembly preferably includes a sampling valve with an outer shell, an insert member and a pivotable valve member therein. The pivotable valve member preferably has a main body portion with first and second circumferential grooves therein and a diagonal bore therethrough for properly directing fluid from and through particular ports in the insert member based on the position of the valve member. The method includes drawing the fluid from the reactor vessel through a valve assembly into an inner vessel of an overflow chamber assembly, overflowing the fluid from the inner vessel into an outer vessel of the overflow chamber assembly, and thereafter retrieving a sample from the inner vessel.

The invention relates to a method and a system for monitoring total phosphorus and total nitrogen of water quality on line. The monitoring method comprises the following steps of: a, acquiring a water sample; b, performing ultraviolet digestion on the acquired water sample according to the principle of ultraviolet digestion and ultraviolet absorption methods; and c, discharging the digested water sample into a cuvette to perform ultraviolet absorption through ultraviolet light, and meanwhile calculating light intensity through a light sensitive sensor to obtain the concentration of pollutants. The detection system comprises a PLC, a CPU, a sample pretreatment device, a multi-way sampling valve, an injector, a reactor, a detector, a human-computer interface and a communication interface, wherein the sample pretreatment device, the injector, the reactor and the detector are connected to the multi-way sampling valve through pipelines respectively. The method and the system can efficiently, quickly, stably and accurately perform continuous detection, storage and forwarding on the concentrations of the total phosphorus and the total nitrogen, and have the advantages of high measurement precision, stable performance, high efficiency, small volume, light weight, convenient assembly and debugging, low cost, low energy consumption, independent use, long-term continuous work and the like.

Present refers to a portable liquid chromatograph. It contains injector pump, sampling valve, optical fiber type ultraviolet-visible absorbing / fluorescence two-purpose flow-through cell and optical fiber assembly, capillary integral post, grating spectrograph, photodiode light source, computer, waste liquid bottle and power supply.

The invention discloses a device for simulating the seepage and siltation of a sand layer, which comprises an upstream water storage tank, a water level control tank, an air-mixed water tank, a control water pump, a withdrawal water pump, a stirrer, an air bubble generator, a downstream water storage tank, digital cameras and a computer. The water level control tank is provided with the stirrer; the air-mixed water tank is provide with the air bubble generator; a water inlet and a water outlet of the inside of an experiment tank body are provided with a first filtering net and a second filtering net; a porous medium for experiment can be filled between the first filtering net and the second filtering net; the computer is connected with the digital cameras; and the first digital camera and the second digital camera are placed at two sides of the experiment tank body respectively. The experiment tank body is provided with a pressure measuring and sampling valve for measuring water pressure and sampling an aqueous solution and a porous medium sample. The device adopts two water pumps, can drive the water current to pass through the testing porous medium in the positive direction and the reverse direction, simulate the cleaning process of the reinjecting and lifting of well water and is favorable for researching the problems of the seepage and siltation of particles and air bubbles in a heat pump system of an underground water source.

The invention discloses a method for detecting and analyzing trivalent chromium and hexavalent chromium in a water sample simultaneously on line. The method is implemented under low pressure and comprises the following steps of: arranging a low-pressure ion chromatographic column in a detection and analysis flow path; and performing simultaneous analysis (the spectrum peak of the hexavalent chromium is ahead, and the spectrum peak of the trivalent chromium is behind) by using differential migration (the hexavalent chromium is not adsorbed by the low-pressure ion chromatographic column, but the trivalent chromium is adsorbed by the low-pressure ion chromatographic column) by using different affinities of the hexavalent chromium and the trivalent chromium with the low-pressure ion chromatographic column. In the method for analyzing the trivalent chromium and hexavalent chromium in the water sample simultaneously on line, an analytical instrument is involved, wherein the analytical instrument comprises a sample flow path, an eluent flow path, an oxidation solution flow path, a color development solution flow path, a sampling valve, a sampling ring, an analysis flow path, an optical detector and a computer processing system; and the analysis flow path consists of the low-pressure ion chromatographic column, a first mixer, an oxidator, a second mixer, a reactor, an optical flow cell and a counter pressor which are connected with one another in series sequentially.

This invention relates to a deep sea hydrothermal fluid sequential sampling device. The invention includes one control unit and multi- sampling units. Control unit mostly includes electromagnetic coupling loop, circuit cavity and temperature probe. Each sampling unit includes one sampling valve and one sampling pip; sampling valve feed liquor mouth connect with sampling tube; out mouth connect with sampling pip; and through water tight wire connect with circuit cavity. Sampling pip composed by sampling cavity and accumulation cavity, could keep sample pressure, and carry out sample's equipressure transferring. The sampling pip adopt single time driven mechanism, can greatly depress systemic power consumption, and make sequential sampling implement have long-term disposal ability. Each sampling unit of sequential sampling implement is mutual independence, can at will to deploy, greatly advance sampler's reliability and applicability.

The invention relates to an online analysis method for sulfur isotope of hydrogen sulfide gas in natural gas. The method comprises the steps of collecting a natural gas sample; heating oxidation furnace of an elemental analyzer to 1,020 DEG C; heating a chromatographic column box to 50 DEG C; introducing reference gas into a stable isotope ratio mass spectrometer, adjusting center magnetic field of the peak with mass / charge ratio of 66, and storing the magnetic field value; connecting a steel cylinder filled with the natural gas sample with a sampling valve, placing in a ventilating hood, and switching on the ventilating hood; taking the natural gas sample with an airtight sample injector; injecting the natural gas sample into a sample inlet; introducing the natural gas sample into a high-temperature oxidation tube with carrier gas, to be oxidized into carbon dioxide, water and sulfur dioxide gas, carrying the mixed gas with carrier gas through a dewatering tube for water removal; separating the dewatered mixed gas with a gas chromatographic column, sequentially introducing into a stable isotope ratio mass spectrometer through a continuous flow interface, measuring sulfur isotope composition, and generating spectrogram.

The present invention belongs to the field of marine technological instrument and equipment. One sample barrel with I-shaped sample cavity piston and one pressure accumulating barrel with pressure accumulating cavity piston are fixed to two ends of one containing body with axial small hole separately, to form pressure accumulating cavity, isolated water cavity, pre-sucking cavity and sample cavity. There are one one-way valve mechanism set in front of the sample cavity piston; varying-damp throttle mechanism comprising the throttle rod on pressure accumulating cavity piston and the small hole in the connecting body; valve plate, sampling valve and water sucking pipe in front end of the sample barrel; and inflating valve behind the pressure accumulating barrel. The present invention hashigh sample purity and automatically controlled sample speed, and is suitable for collecting deep sea hot liquid flow sample.

The invention relates to a water-sediment compound simulation test device which is formed by combining a testing column with a built-in layering testing cylinder, wherein an outer cylinder top cover is transparent and detachable; a sampling valve is arranged on a side face; the water replenishing and water sampling operations can be carried out conveniently; and a dewatering valve is arranged on the bottom of the side face. If the device is used for a test, an inner cylinder is taken out firstly, and then the inner cylinder is slowly descended to the outer cylinder by taking a cotton thread by hand after being filled with the acquired field sediment, an evacuation valve is closed, water is slowly filled in from the top of the outer cylinder, and then the test is started. When the sedimentsample is needed to be taken, the following operations are performed: exhausting the water of the outer cylinder by using the evacuation valve of the outer cylinder and then taking out the inner cylinder by taking the cotton thread by hand; taking off a PVC (polyvinyl chloride) short plug from one bottom corner of the inner cylinder and pulling out a PVC long nail from an inner cylinder top corner corresponding to the bottom corner by firmly holding a nail cap; inserting gaskets in layers by starting from the top layer and rotating the inner cylinder and gaskets by using the PVC long nail at another corner as a shaft; and then vertically moving the gaskets downwards, thereby guiding the sediment on the layers to fall onto the gaskets. Different layered sediment samples can be convenientlyand accurately acquired by performing the operations layer by layer.

The invention discloses a quantitative sampling device for liquid or fluid, comprising a mounting frame, an injector, a sampling valve and a displacement control mechanism, wherein the injector is fixed on the mounting frame; one valve port of the sampling valve is communicated with an injector pipeline; and the displacement control mechanism acts on a piston of the injector and controls the piston to move. The quantitative sampling device adopts the injector to quantitatively sample liquid or fluid and accurately controls the amount of the liquid or the fluid to be sampled by controlling thedisplacement distance of the piston of the injector. Compared with the prior quantitative sampling device adopting a quantitative pump or a peristaltic pump, the invention has simpler structure and can greatly improve the quantitative liquid or fluid-sampling accuracy.

The invention discloses a synthesized bearing fault simulation test bed. An experimental bearing pedestal adopts a convenient detachable structure, an unattached lubricating system, and unattached axial and radial loading equipment so that an experimental bearing can be conveniently dismantled and installed, the individual loading of the axial loading and the radial loading of the experimental bearing can be realized, and the united loading of the axial loading and the radial loading also can be realized; a vibration pickup arranged on the experimental bearing pedestal and an oil pipe sampling valve arranged on a lubricating system can realize real-time vibration monitoring and on-line oil detection on a rolling bearing.

The invention provides a spot simulation device for fault oil products of a transformer, comprising a temperature control system composed of an electric heater, and a piston type expander, wherein an electrode point pressure gauge is arranged at the top of an oil storage tank; the electrode of the electrode point pressure gauge is connected on a power supply loop of the heater; the electric heater is arranged in the oil storage tank and / or on an upper pipeline of the oil storage tank; a temperature sensor is arranged on the side wall of the oil storage tank; a circulating pump is arranged between the upper pipeline of the oil storage tank and a bottom pipeline of the oil storage tank; an oil sample inlet of the transformer is arranged on the upper pipeline of the oil storage tank; the bottom pipeline of the oil storage tank is provided with a standard gas sample inlet and a sampling pipe; the sampling pipe is provided with a sampling valve; and the piston type expander is communicated with the oil storage tank through the top of the oil storage tank. Through quantitatively adding the transformer oil and standard gas to the oil storage tank, heating and circulating at a constant temperature, the oil and the gas are balanced so as to form the standard oil sample containing standard gas component value; and the oil sample is finally used for the spot detection of an online chromatograph.

The invention discloses a method for observing obstruction of microbial groundwater seepage and blockage as well as a device thereof. The method comprises the followings steps: (1) adding a porous medium to an experiment box; (2) regulating water level of an upstream control water tank to stabilize the water flow, constantly illuminating with a light source, and recording light rays from the box; (3) recording the water level and nutritive substances of the control water tank by a digital camera and storing the images; (4) quantitatively analyzing microbial aggregation density and porous medium density, obtaining a sample containing microbe aqueous solution and the porous medium from a sampling valve of the experiment box; and (5) killing microbes by the ultraviolet ray; wherein, the experiment box is equipped with a valve, a filter screen and a water storage tank which is connected with a water pump, the water pump is connected with the control water tank, and a water inlet tube is connected with the experiment box. The method helps directly observe and record the propagation and migration of the microbes in the porous medium, the blockage manner and change of a water flow passage, obtains the observation data, facilitates the control of the microbial activity and sampling analysis, and is applicable to simulation research of the microbial seepage and obstruction problem in a groundwater source heat pump system.

A sampling apparatus for use with a sample analyzer comprises a sample probe insertable into a process stream, and an extraction cylinder including a variable volume chamber and a piston movable by an actuator back and forth in the cylinder to increase and decrease the volume of the variable volume chamber. A sampling valve is connected between the extraction cylinder and the sample probe, with a sample line connecting the sampling valve to the sample probe, and the variable volume chamber having a capacity substantially greater than the combined volumes of the sample probe, sampling valve and sample line. A filter assembly is interposed between the sample probe and sampling valve for filtering undesired substances from the fresh sample prior to the fresh sample reaching the sampling valve, and a controller is provided for controlling the actuator and the sampling valve, first to move the piston at a first rate to increase the variable volume chamber sufficiently to draw fresh sample from the process stream and past the sampling valve, then to operate the sampling valve for injecting fresh sample into the sample analyzer, and thereafter to move the piston at a second rate greater than the first rate to decrease the variable volume chamber to flush excess sample back into the process stream and clean the filter of undesired substances filtered from the fresh sample.

Process sample and dilution systems automatically draw sample from a reactor or other source of sample and prepare drawn sample for subsequent injection to a chromatographic column or a detector. The process sample and dilution system has an external pump valve assembly in fluidic communication with a process sample manager. The external pump valve assembly includes an external sampling valve, an external process valve, external pump and a mixing tee. The external sampling valve can be configured to automatically acquire sample from a reactor or other source of sample. The external pump discharges wash from the external process valve whereby sample is discharged from the external sampling valve to the mixing tee for quenching and dilution and subsequent processing by the process sample manager.

Apparatus for aspirating and dispensing liquid samples in an analytical instrument, e.g., a hematology instrument, includes a liquid-sampling valve that, while operating to segment and position for dispensing one or more precise volumes of a liquid sample that has been aspirated into the valve by a pump, simultaneously enables the apparatus to be operated in an aspirate / dispense (suck-and-spit) mode in which a liquid sample can be selectively driven through the valve in opposite directions by a pump, e.g., a syringe pump.

The invention relates to an quantitative determination method of the isotope of hydrogen, hydrogen deuteride and hydrogen deuterium, which comprises using neon gas to be carrier gas, leading a gas chromatograph to adopt a double-strut double-temperature system, choosing 50 DEG C sampling temperature, sampling through an injector or a gas sampling valve, and the sampling quantity is 0.1-2.2mL, sample gas which is separated by a gas-chromatography column generates electrical signals through a detector, recording the pear areas of hydrogen, hydrogen deuteride and deuterium gas of chromatogram peaks through a chromatogram working station after the electrical signals are magnified through a front magnifier, adopting a volume correction factor normalization method or an external standard method to measure the content of hydrogen (H2), hydrogen deuteride (HD) and deuterium (D2), and getting detection results. The invention has the advantages of excellent separation effect of hydrogen isotope and high detection sensitivity, the detection of the pureness of deuterium gas can reach more than 99.99%, hydrogen deuteride (HD) and deuterium (D2) are sampled in big dosage, the peaks are not overlapped, thereby guaranteeing the quantitative detection of high-purity deuterium gas, and standard gas is not needed to be prepared in the process of detecting. The method simplifies the operation process, which is convenient for on-line detection of deuterium gas in the process of producing.

The invention discloses a hydraulic pressure triggered deep sea thermal water air tight sampler comprising a sampling valve, a sampling cavity, an energy storage cavity, a circuit cavity, and a hydraulic pressure trigger mechanism in coaxial connection with the sampling valve. The sampler provided by the invention is characterized in that the sampling valve is turned on and off through hydraulic driving; the trigger mechanism has a simple structure, and the reliability of action is high; and the thrust necessary for turning on the sampling valve can be greatly reduced because the hydraulic pressure trigger mechanism is capable of amplifying force. By utilizing the compressed nitrogen in the energy storage cavity to compensate for pressure, the sampler has excellent pressure maintaining performance. The sampler is integrated with a temperature measurement system, so that the real-time temperature of the thermal water can be obtained during the process of sampling. Furthermore, the sampler with a compact overall structure and a small overall size is suitable for the operation of a manipulator of a deep submergence vehicle.

The invention relates to a flow injection analysis device for nitrite or nitrate in water. The device comprises a photoelectric flow cell, a reactor, a developer bottle, a carrier liquid bottle, a copper-cadmium column, an injection pump of carrier liquid, a developer delivery pump, a sample delivery pump, a triple valve, a four-way valve and two six-way sampling valves, with the components and valves connected by capillaries. In the device, a phosphoric acid solution with a pH of 1.8 is taken as the carrier liquid which is continuously injected into the pipelines of the capillaries by the constant-current injection pump. A quantitative water sample and a developer are pitched into the carrier liquid by the sampling valves. Then the water sample diffuses in the oriented flowing carrier liquid and mixes and reacts with the developer, and the reaction liquid is brought into the colorimetric flow cell (i.e. the photoelectric flow cell) by the carrier liquid. After absorption of lights with a wavelength of 540nm and photoelectric conversion, an absorbance value can be tested. And finally, the carrier liquid flows out of the outlet capillaries of the flow cell. With accurate test data and substantially shortened test period, the analysis device of the invention is suitable for rapid detection of nitrite and nitrate.

The invention discloses a liquid pressure-maintaining and sampling tube which comprises a connector, two cavities and two sampling valves, wherein the two cavities are respectively connected with the two ends of the connector; a communicating hole is formed in the connector and communicated with the two cavities, and ladder-shaped through holes are an outer end hole, a sealing hole, a flow guide groove and a flow guide hole from outside to inside in sequence and are formed in the two cavities; each sampling valve is composed of a valve body, a sealing shaft and a valve rod which are connected in sequence, matched with the corresponding ladder-shaped through hole through threads and fixed in the ladder-shaped through hole, each sealing shaft is in close fit with the corresponding sealing hole, a ball is propped against the end part of each flow guide hole, and pistons are respectively arranged in the two cavities. The liquid pressure-maintaining and sampling tube disclosed by the invention can realize spontaneous sampling without an additional drive device, is simple in structure, convenient to operate, good in pressure-maintaining property and reliable in sampling and can be recycled.

The invention relates to dynamic simulation devices and methods for all voltage grades of a power system, in particular to a simulation device and method of the characters of a merging unit of an intelligent transformer substation. The simulation device accords with a DL / T860 communication protocol and has the functions that secondary signals of multiple traditional voltage mutual inductors and current mutual inductors are received; the secondary signals are converted into digital light signals which accord with the DL / T860.92 and the GB / T 20840.8; all characters of the merging unit can be simulated at the same time, wherein the characters comprise the synchronizing and desynchronizing character, frame loss, delay, delay deviation and delay jitter of sampling valve messages, and sampling frequency deviation and jitter; the synchronous mark, the state character and the quality place of the sampling valve messages can be modified in real time, and the sampling valve deviation and superimposed harmonic components can be simulated. The simulation device and method solve the problem that simulation can not be achieved easily for abnormal conditions of the electronic mutual inductors and the merging unit in the dynamic simulation process of the intelligent transformer substation, and can be widely applied to reliability research and testing of secondary equipment of the intelligent transformer substation.

The invention relates to a method for prolonging storage tenure of grains and bean grains to prevent deterioration, and equipment thereof. The equipment comprises a grain store, wherein the grain store can ensure vacuum degree and can be sealed; a vacuum pump assembly is arranged outside and communicated with the grain store; a pipeline and a valve are arranged on the store wall to fill nitrogen into the grain store; the store wall is provided with an entry inspection door; an air lock store is arranged on a cover board of the entry inspection door, is communicated with the grain store through an air lock valve and the outside through a sampling valve; a discharge valve, a discharge pipeline and a conveying pipeline with a turnover valve are arranged in the center of the bottom of the store; and an electroheat low-temperature drying system, a temperature sensor and a humidity sensor are arranged in the grain store, and the temperature sensor and the humidity sensor can detect temperature and humidity in the grain store respectively, so that oxygen and humidity during the period of grain storage can be controlled by the vacuum technology, and the grains are enforced to be in natural dormancy. Therefore, speed of natural exhaustion of the grains can be controlled to achieve the aim of prolonging the tenure of storage of the grains to prevent deterioration, and the grain store has low cost, easy construction and wide application range.

The invention provides a rainwater quality monitoring and infiltration simulating comprehensive experiment instrument which at least comprises a base and an organic glass shell arranged on the base, wherein a rainwater collecting device, a pretreatment device, a monitoring system and an infiltration experiment simulation device are arranged on the organic glass shell and inside the organic glass shell, the rainwater collecting device at least comprises a rainwater collecting plate, a rainwater divider and a rainwater collecting box; the pretreatment device at least comprises an acid reagent dispenser, a clamping-pressing type membrane changing filter and a sampling valve; the monitoring system at least comprises a flowmeter and a multifunctional detection device; and the infiltration experiment simulation device at least comprises a rainwater temporary storage box and a soil column, the soil column is arranged below the rainwater temporary box and is vertically fixed at the bottom in the organic glass shell through a soil column bracket, and a water outlet in the bottom of the rainwater temporary box is communicated to the top end of the soil column through a guide pipe. According to the rainwater quality monitoring and infiltration simulating comprehensive experiment instrument, the defect in the prior art is solved, and the demands of the rainwater recharge research and rainwater hydrogeochemistry characteristic investigation in all places can be met.

The invention provides an apparatus for supercritical fluid chromatography. The apparatus comprises a binary pump; an autosampler; a sampling valve; a first and second port switching valve; a first and second manifold; two or more channels, each having a check valve assembly, a separation column and one or more detectors operatively connected thereon; and a backpressure regulator. The apparatus also includes computer software and hardware to control distribution of fluid through the apparatus, including switching between a multi-channel mode or a single channel ode; 2) analyze data collected by the one or more detectors; and 3) optimize separation of analytes by controlling solvent combinations, concentration gradients, pressure and temperature. The apparatus excludes additional backpressure regulators or pumps on individual channels. Also provided is a method of screening a sample, using supercritical chromatography, using the above apparatus, where multiple samples can be screened simultaneously with parallel processing.

The invention relates to a one-trip string two-layer layering perforation-layering testing combining tubular column and an operation method. The tubular column comprises a first oil tube, a depth correction short joint, a second oil tube, a circulating valve, a third oil tube, a testing valve assembly, a second pressure gauge supporting cylinder, a second pressure transfer joint, a straddle packer, a second sieve tube, a spacer tube, a pressure guiding joint, a second ignition head, a second perforating gun, a pressure release device, sealing layer well shut-in sampling valve, a damping pressure gauge supporting cylinder, a first pressure transfer joint, an anchor packer, a first sieve tube, a shock absorber, a fourth oil tube, a first ignition head, a first perforating gun, a pressure relieving device, a second inner pressure transfer tube, a first pressure transfer tube and a first outer pressure transfer tube. The sealing layer well shut-in sampling valve is located between the second perforating gun and the anchor packer. The damping pressure gauge supporting cylinder is located below the sealing layer well shut-in sampling valve. by adopting the tubular column, two-layer layering perforation and layering testing combination can be completed, final well shut-in of the first layer does not need to occupy the operation machine time independently, down-hole sampling is convenient, and the tubular column has the advantages of being short in period, low in cost and the like.

The invention relates to an electric deep-sea hydrothermal pressure-maintaining sampler. The existing product is not compact enough in structure. The electric deep-sea hydrothermal pressure-maintaining sampler comprises a sampling pipe, a sampling valve, an electronic control driver and a sampling barrel, wherein the electronic control driver comprises a driver cavity, a circuit cavity and a transmission screw rod which are arranged in a coaxial way; a motor is fixedly arranged in a sleeve; the sleeve is movably connected with the driver cavity, can move axially, but can not rotate; two limit switches are respectively arranged at the two ends of the motor; one end of the transmission screw rod is fixedly connected with a motor shaft in a coaxial way, and the other end of the transmission screw rod is connected with the end part of a sampling piston of the sampling valve; the sampling barrel comprises a sampling cavity, an energy storage cavity, a connector and an inflation valve body which are arranged in a coaxial way; one end of the sampling pipe is connected with a liquid inlet of the sampling valve; a liquid outlet of the sampling valve is connected with a liquid inlet through hole of the sampling cavity. A trigger mechanism of the electric deep-sea hydrothermal pressure-maintaining sampler is simple in structure and high in action reliability; the electric deep-sea hydrothermal pressure-maintaining sampler has the characteristics of being simple and convenient to control, reusable and the like, thus being suitable for the operation of a mechanical arm of a deep submergence vehicle.

The invention provides a liquid chromatographic sampling passage cleaning device. The liquid chromatographic sampling passage cleaning device mainly comprises a microfluidic pump, a compressed air source, a capillary flow limiter, a liquid-gas switching valve, a sampling-cleaning switching valve, a waste liquid collecting cup, a waste liquid bottle, a sampling valve, a sampling port and a program controller. After sampling, a cleaning solution is used for reversely rinsing a liquid chromatographic sampling passage to reversely rinse particles left on a filter in the sampling process and discharge the particles out of a sampling pipeline first and then microflow gas is used for reversely purging the sampling passage to expel liquid left inside the pipeline so as to avoid sample dilution during sampling once again. The liquid chromatographic sampling passage cleaning device is suitable for various analytical-grade liquid chromatographs, comprising positive chromatography, reverse chromatography, ion chromatography and the like, as well as suitable for cleaning a sampling loop for flow injection analysis, so that cross pollution of samples is avoided, the sampling repeating precision is improved, and the service life of the sampling filter can be greatly prolonged.

The invention relates to a device and a method for repairing underground water through a process of activating sodium persulfate by using Fe (II). The device is a semi-continuous inlet / outlet type reaction device consisting of three parts. A first part is connected with a water sample, simulates a soil water-containing layer of underground water and controls flow rate. A second part therein is provided with a slow-release material and releases sodium persulfate when being in contact with solution. A third part is connected with the second part and Fe<2+> solution and controls activation reaction of each component. A sampling valve is arranged in the middle of a column of each part, and the water sample can be collected and is used for analyzing concentration of pollutants, concentration of S2O8<2->, concentration of Fe<2+> and pH of solution after reaction. The device and the method for repairing underground water through the process of activating sodium persulfate by using Fe (II) have a better effect of treating organic matters which are difficult to dissolve, and a model has a function of simulating large-scale application.