DE4316734A1 - Sample-taking valve for removing liquid or flowable matter from vessel or pipeline - has displacement piston followed by blocking piston, forming intermediate space between pistons and causing delivery opening to close - Google Patents
Sample-taking valve for removing liquid or flowable matter from vessel or pipeline - has displacement piston followed by blocking piston, forming intermediate space between pistons and causing delivery opening to closeInfo
- Publication number
- DE4316734A1 DE4316734A1 DE19934316734 DE4316734A DE4316734A1 DE 4316734 A1 DE4316734 A1 DE 4316734A1 DE 19934316734 DE19934316734 DE 19934316734 DE 4316734 A DE4316734 A DE 4316734A DE 4316734 A1 DE4316734 A1 DE 4316734A1
- Authority
- DE
- Germany
- Prior art keywords
- piston
- displacement
- shut
- pistons
- displacement piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/10—Arrangements for supervising or controlling working operations for taking out the product in the line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
- F16K3/243—Packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
- F16K51/02—Other details not peculiar to particular types of valves or cut-off apparatus specially adapted for high-vacuum installations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
- G01N1/2035—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
- G01N1/2035—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping
- G01N2001/205—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping using a valve
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Description
Die Erfindung betrifft ein Probenahmeventil für die Entnahme flüssiger oder fließfähiger Stoffe aus einem Behälter oder einer Rohrleitung, bestehend aus einem zylindrischen Ventil körper mit einer Eintragsöffnung und einer Austragsöffnung, zwischen denen ein betätigbares Verschlußorgan angeordnet ist.The invention relates to a sampling valve for removal liquid or flowable substances from a container or a pipeline consisting of a cylindrical valve body with an entry opening and a discharge opening, between which an actuatable closure member is arranged is.
Ein Probenahmeventil sollte folgenden Anforderungen genügen:A sampling valve should meet the following requirements:
- - möglichst totraumfreie Konstruktion zur Gewährleistung von repräsentativen Proben- Construction as free of dead spaces as possible to guarantee of representative samples
- - definiertes Probevolumen- defined sample volume
- - Reinigungsmöglichkeit durch Spülanschluß oder ähnliches, um bei kritischen Produkten, z. B. polymerisierenden Me dien, die benetzten Teile zu säubern- Possibility of cleaning by rinsing connection or similar, for critical products, e.g. B. polymerizing Me serve to clean the wetted parts
- - vollkommener Abschluß des Entnahmeraumes gegen die Umge bung in jeder Ventilstellung- Complete closure of the removal room against the reverse Practice in every valve position
- - Probenahme unter erschwerenden Bedingungen wie Druck, Vakuum und hohe Temperaturen.- sampling under aggravating conditions such as pressure, Vacuum and high temperatures.
Die bisher in der Praxis gebräuchlichen Probenahmeventile erfüllen die genannten Anforderungen nur teilweise. Insbe sondere mangelt es an totraumfreien und handhabungsfreund lich reinigbaren Konstruktionen.The sampling valves previously used in practice only partially meet the requirements mentioned. In particular there is a particular lack of dead space-free and easy to handle constructions that can be cleaned.
Es war daher die Aufgabe zu lösen, ein Probenahmeventil zu entwickeln, welches die oben genannten Anforderungen bei einfacher Konstruktion erfüllt.It was therefore the task to solve a sampling valve develop which meets the above requirements simple construction.
Die Lösung der Aufgabe besteht in einem Probenahmeventil der eingangs geschilderten Art, bei dem sich im Ventilkörper ein axial verschieblicher Verdrängerkolben von der Eintragsöff nung bis zur Austragsöffnung erstreckt, dem ein Absperrkol ben folgt, wobei zwischen den beiden Kolben durch Relativbe wegung ein Aufnahmeraum bildbar und dabei durch eine Mitneh mereinrichtung des Verdrängerkolbens der Absperrkolben in eine die Austragsöffnung abschließende Stellung bringbar ist.The solution to the problem is a sampling valve type described above, in which in the valve body axially displaceable displacement piston from the entry opening tion extends to the discharge opening, which a shut-off piston ben follows, being between the two pistons by Relativbe movement, a recording room can be formed and thereby be taken along mereinrichtung of the displacement piston of the shut-off piston in a position closing the discharge opening can be brought is.
Weitere Einzelheiten und Vorteile des Probenahmeventils nach der Erfindung sind anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispiels nachfolgend beschrieben.Further details and advantages of the sampling valve after the invention are schematic with reference to one in the drawing illustrated embodiment described below.
Es zeigenShow it
Fig. 1 das Probenahmeventil in einem Längsschnitt Fig. 1 shows the sampling valve in a longitudinal section
Fig. 2 bis 6 das Probenahmeventil in verschiedenen Be triebszuständen. Fig. 2 to 6, the sampling valve in different operating states Be.
Das Probenahmeventil ist für die Probenahme flüssiger, hoch viskoser und pastöser Stoffe aus Rohrleitungen und Apparaten jeglicher Art, unter Druck oder unter Vakuum, geeignet und besteht aus einem zylindrischen Ventilkörper 1 (Fig. 1), welcher an seinen beiden Enden mit jeweils einem Anschluß flansch 2 und 3 versehen ist und an einer Stirnseite eine Eintragsöffnung 4 und seitlich eine Austragsöffnung 5 mit einem sich anschließenden Auslaufrohr 6 aufweist. Für be stimmte Anwendungsfälle kann es zweckmäßig sein, den Ventil körper beheizbar oder kühlbar auszuführen, beispielsweise durch einen Doppelmantel mit Zwischenraum zum Durchfluß eines Reiz- oder Kühlmediums oder durch Reiz- bzw. Kühl schlangen oder aber durch eine umgebende elektrische Hei zung. Im Ventilkörper befindet sich ein axial verschiebli cher Verdrängerkolben 7, der über eine Kolbenstange 8 entwe der manuell oder pneumatisch oder hydraulisch oder elektro mechanisch antreibbar ist. Die Länge des Kolbens ist so be messen, daß von diesem sowohl die Eintragsöffnung als auch die Austragsöffnung abgeschlossen werden. Auf den Verdrän gerkolben 7 folgt ein Absperrkolben 9, der auf der Kolben stange 8 axial verschieblich geführt ist und an einem in einer Nut 10 des Ventilkörpers 1 gehaltenen Sicherungs ring 11 eine untere Endstellung einnimmt. In dieser Stellung reicht der Absperrkolben bis mindestens an den unteren Rand der Austragsöffnung 5. Mittels eines an der Kolbenstange 8 befestigten Mitnehmerrings 12 wird der Absperrkolben 9 durch den Verdrängerkolben 7 nach einem Hub mitbewegt, durch den zwischen beiden Kolben ein Aufnahmeraum 13 (Fig. 3) gebil det wird. Der Abstand des Mitnehmerrings 12 vom Absperrkol ben 9 ist so bemessen, daß dieser noch vor dem Austreten des Verdrängerkolbens 7 aus der Eintragsöffnung 4 in die die Austragsöffnung 5 abschließende Stellung bewegt wird. Die obere Endstellung ist erreicht, wenn der Verdrängerkolben die Eintragsöffnung verlassen hat. In dieser Stellung stößt der Absperrkolben mit seinem Bund 14 gegen einen inneren Ab satz 15 des Ventilkörpers 1.The sampling valve is suitable for sampling liquid, highly viscous and pasty substances from pipelines and apparatus of all kinds, under pressure or under vacuum, and consists of a cylindrical valve body 1 ( Fig. 1), which is flanged at both ends with a connection 2 and 3 is provided and has an inlet opening 4 on one end face and an outlet opening 5 with a subsequent outlet pipe 6 on the side. For certain applications, it may be appropriate to run the valve body heatable or coolable, for example by a double jacket with space for the flow of an irritant or cooling medium or by irritating or cooling coils or by a surrounding electrical heating. In the valve body there is an axially displaceable displacement piston 7 , which can be driven manually or pneumatically or hydraulically or electro-mechanically via a piston rod 8 . The length of the piston is to be measured so that both the entry opening and the discharge opening are closed by it. On the displacement piston 7 is followed by a shut-off piston 9 , which is axially displaceably guided on the piston rod 8 and on a retaining ring 11 held in a groove 10 of the valve body 1 assumes a lower end position. In this position, the shut-off piston extends at least to the lower edge of the discharge opening 5 . By means of a driver ring 12 attached to the piston rod 8 , the shut-off piston 9 is moved by the displacer piston 7 after a stroke, through which a receiving space 13 ( FIG. 3) is formed between the two pistons. The distance of the driving ring 12 from the shut-off piston 9 is dimensioned such that it is moved before the displacement piston 7 emerges from the entry opening 4 into the position 5 that closes the discharge opening. The upper end position is reached when the displacement piston has left the entry opening. In this position, the shut-off piston abuts with its collar 14 against an inner set 15 of the valve body 1 .
Zum besseren Verständnis des vorstehend beschriebenen Probe nahmeventils ist nachfolgend dessen Betriebsablauf nach den Fig. 1 bis 6 erläutert:For a better understanding of the sampling valve described above, its operating sequence according to FIGS . 1 to 6 is explained below:
Fig. 1 im Ausgangszustand befinden sich der Absperrkol ben 9 und der Verdrängerkolben 7 in der unteren Endlage, die durch den Sicherungsring 11 festgelegt ist. In dieser Stellung dichtet der Verdrängerkol ben den Entnahmeraum gegen das Auslaufrohr 6 ab. Fig. 1 in the initial state are the shut-off piston ben 9 and the displacement piston 7 in the lower end position, which is determined by the locking ring 11 . In this position, the displacement piston seals the removal space against the outlet pipe 6 .
Fig. 2 zur Probenahme wird der Verdrängerkolben in den Entnahmeraum geschoben. Dabei ist durch die Geome trie und Anordnung von Verdrängerkolben, Absperr kolben und Auslaufrohr gewährleistet, daß zu jedem Zeitpunkt der Aufwärtsbewegung des Verdrängerkol bens der Entnahmeraum gegen die Atmosphäre abge dichtet ist. Bevor der untere Dichtring 16 des Ver drängerkolbens 7 den Ventilkörper 1 verläßt, ver schließt der Absperrkolben, der durch die Aufwärts bewegung des Verdrängerkolbens über den Sicherungs ring 12 mitgenommen wird, den Zugang zum Auslauf rohr 6. Fig. 2 for sampling the displacement piston is pushed into the removal space. It is ensured by the geometry and arrangement of the displacer piston, the shut-off piston and the outlet pipe that the removal space is sealed against the atmosphere at all times during the upward movement of the displacement piston. Before the lower sealing ring 16 of the displacer 7 leaves the valve body 1 , the shut-off piston closes, which is taken along by the upward movement of the displacer via the securing ring 12 , access to the outlet pipe 6 .
Fig. 3 das Ende der Aufwärtsbewegung ist erreicht, wenn der Absperrkolben mit seinem Bund auf den Absatz des Ventilkörpers aufläuft. Das Volumen des Ventil körpers über dem Absperrkolben füllt sich dann mit dem zu entnehmenden Medium. Fig. 3 the end of the upward movement is reached when the shut-off piston with its collar runs onto the shoulder of the valve body. The volume of the valve body above the shut-off piston then fills with the medium to be removed.
Fig. 4 nun folgt der eigentliche Austragsvorgang, bei dem der Verdrängerkolben nach unten in den Ventilkörper zurückgezogen wird. Sobald der Verdrängerkolben in den Ventilkörper eintritt, wird das Probevolumen zwischen Verdrängerkolben und Absperrkolben einge schlossen. Fig. 4 now follows the actual discharge process, in which the displacement piston is pulled back down into the valve body. As soon as the displacement piston enters the valve body, the sample volume is closed between the displacement piston and the shut-off piston.
Fig. 5 bei weiterer Abwärtsbewegung des Verdrängerkolbens wird der Absperrkolben über das eingeschlossene Probevolumen nach unten mitgenommen und durch den Sicherungsring 11 in seiner unteren Endlage festge halten. Fig. 5 with further downward movement of the displacement piston, the shut-off piston is taken down over the included sample volume and held in place by the locking ring 11 in its lower end position.
Fig. 6 durch die Abwärtsbewegung des Verdrängerkolbens wird das eingeschlossene Probevolumen über das Aus laufrohr ausgetragen bis der Verdrängerkolben auf dem Absperrkolben aufsitzt und das Probevolumen vollständig ausgetragen ist. Fig. 6 by the downward movement of the displacer piston, the enclosed sample volume is discharged from the outlet pipe until the displacer piston sits on the shut-off piston and the sample volume is discharged completely.
Die Vorteile des Probenahmeventils gemäß der Erfindung sind zu erkennen:The advantages of the sampling valve according to the invention are to recognize:
- - absoluter Abschluß des Entnahmeraums zur Atmosphäre in jeder Ventilstellung (Totmannsprinzip)- Absolute closure of the removal room to the atmosphere in every valve position (dead man's principle)
- - totraumfreie Konstruktion- Dead space free construction
- - konstantes Probevolumen.- constant sample volume.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19934316734 DE4316734A1 (en) | 1992-05-27 | 1993-05-19 | Sample-taking valve for removing liquid or flowable matter from vessel or pipeline - has displacement piston followed by blocking piston, forming intermediate space between pistons and causing delivery opening to close |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4217510 | 1992-05-27 | ||
DE19934316734 DE4316734A1 (en) | 1992-05-27 | 1993-05-19 | Sample-taking valve for removing liquid or flowable matter from vessel or pipeline - has displacement piston followed by blocking piston, forming intermediate space between pistons and causing delivery opening to close |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4316734A1 true DE4316734A1 (en) | 1993-12-02 |
Family
ID=25915199
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19934316734 Withdrawn DE4316734A1 (en) | 1992-05-27 | 1993-05-19 | Sample-taking valve for removing liquid or flowable matter from vessel or pipeline - has displacement piston followed by blocking piston, forming intermediate space between pistons and causing delivery opening to close |
Country Status (1)
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DE (1) | DE4316734A1 (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19538281C1 (en) * | 1995-10-17 | 1996-10-24 | Paul Dipl Ing Appelhaus | Sampling valve for liquid or paste |
DE29713919U1 (en) * | 1997-08-05 | 1997-10-09 | Hoechst Marion Roussel Deutschland GmbH, 65929 Frankfurt | Device for removing solids from pressure-superimposed systems |
FR2752936A1 (en) * | 1996-09-02 | 1998-03-06 | Parron Pierre | Fluid sampling tap with automatic or manual control |
DE19747948C1 (en) * | 1996-11-14 | 1998-07-02 | Email Cover R Scholz Gmbh | Device for extracting or supplying viscous liquids |
EP0898160A1 (en) * | 1997-08-16 | 1999-02-24 | Email-Cover R. Scholz GmbH | Sampling valve |
DE10334927A1 (en) * | 2003-07-31 | 2005-03-03 | Universität Tübingen | Device for taking samples, storing, transporting, metering and feeding gases into analysis device for chemical analysis comprises syringe body having opening in front of rear dead point of plunger |
US6886420B2 (en) * | 2001-02-01 | 2005-05-03 | Rhe Haendel Engineering Gmbh & Co Kg | Sampling apparatus |
DE102004021135A1 (en) * | 2004-04-29 | 2005-11-24 | Sollich Kg | Apparatus for detecting crystallization set-up curves of chocolate and similar fat masses |
WO2006007655A1 (en) * | 2004-07-23 | 2006-01-26 | In2Process Pty Ltd | Pipeline sampling device |
DE10191532B4 (en) * | 2000-04-06 | 2009-09-17 | Compagnie Générale des Matières Nucléaires | Sampling device |
WO2010121690A1 (en) * | 2009-04-24 | 2010-10-28 | Andocksysteme G. Untch. Gmbh | Valve for extracting a sample from a content of a tank |
DE102010060241A1 (en) * | 2010-10-28 | 2012-05-03 | Hecht Technologie Gmbh | Probe receiver for removal of sample of powder or bulk material, has pump port that attaches pump to production of low pressure such that sample is pneumatically separable over terminal from storage device |
DE202013000217U1 (en) * | 2013-01-10 | 2014-04-14 | Gebr. Kemper Gmbh + Co. Kg Metallwerke | Domestic hot water supply and removal system for a wash basin and sampling valve for such a system |
CN103851214A (en) * | 2014-03-19 | 2014-06-11 | 中国石油集团工程设计有限责任公司 | Novel mixing homogenous phase porous sampling valve |
CN107063760A (en) * | 2017-03-13 | 2017-08-18 | 苏州安利化工有限公司 | Vacuum sampling valve and fast sampling method |
-
1993
- 1993-05-19 DE DE19934316734 patent/DE4316734A1/en not_active Withdrawn
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19538281C1 (en) * | 1995-10-17 | 1996-10-24 | Paul Dipl Ing Appelhaus | Sampling valve for liquid or paste |
FR2752936A1 (en) * | 1996-09-02 | 1998-03-06 | Parron Pierre | Fluid sampling tap with automatic or manual control |
DE19747948C1 (en) * | 1996-11-14 | 1998-07-02 | Email Cover R Scholz Gmbh | Device for extracting or supplying viscous liquids |
DE29713919U1 (en) * | 1997-08-05 | 1997-10-09 | Hoechst Marion Roussel Deutschland GmbH, 65929 Frankfurt | Device for removing solids from pressure-superimposed systems |
EP0898160A1 (en) * | 1997-08-16 | 1999-02-24 | Email-Cover R. Scholz GmbH | Sampling valve |
DE10191532B4 (en) * | 2000-04-06 | 2009-09-17 | Compagnie Générale des Matières Nucléaires | Sampling device |
US6886420B2 (en) * | 2001-02-01 | 2005-05-03 | Rhe Haendel Engineering Gmbh & Co Kg | Sampling apparatus |
DE10334927A1 (en) * | 2003-07-31 | 2005-03-03 | Universität Tübingen | Device for taking samples, storing, transporting, metering and feeding gases into analysis device for chemical analysis comprises syringe body having opening in front of rear dead point of plunger |
DE102004021135B4 (en) * | 2004-04-29 | 2007-08-02 | Sollich Kg | Apparatus for detecting crystallization set-up curves of chocolate and similar fat masses |
DE102004021135A1 (en) * | 2004-04-29 | 2005-11-24 | Sollich Kg | Apparatus for detecting crystallization set-up curves of chocolate and similar fat masses |
US7954423B2 (en) | 2004-04-29 | 2011-06-07 | Sollich Kg | Apparatus for determining crystallization solidification curves of fat-containing masses |
WO2006007655A1 (en) * | 2004-07-23 | 2006-01-26 | In2Process Pty Ltd | Pipeline sampling device |
US7984660B2 (en) | 2004-07-23 | 2011-07-26 | Scott Roger Nathan | Pipeline sampling device |
WO2010121690A1 (en) * | 2009-04-24 | 2010-10-28 | Andocksysteme G. Untch. Gmbh | Valve for extracting a sample from a content of a tank |
DE102010060241A1 (en) * | 2010-10-28 | 2012-05-03 | Hecht Technologie Gmbh | Probe receiver for removal of sample of powder or bulk material, has pump port that attaches pump to production of low pressure such that sample is pneumatically separable over terminal from storage device |
DE102010060241B4 (en) * | 2010-10-28 | 2015-09-10 | Hecht Technologie Gmbh | samplers |
DE202013000217U1 (en) * | 2013-01-10 | 2014-04-14 | Gebr. Kemper Gmbh + Co. Kg Metallwerke | Domestic hot water supply and removal system for a wash basin and sampling valve for such a system |
US9551134B2 (en) | 2013-01-10 | 2017-01-24 | Gebr. Kemper Gmbh & Co. Kg Metallwerke | Domestic-water supply and withdrawal system for a washstand and sampling valve for such a system |
CN103851214A (en) * | 2014-03-19 | 2014-06-11 | 中国石油集团工程设计有限责任公司 | Novel mixing homogenous phase porous sampling valve |
CN103851214B (en) * | 2014-03-19 | 2016-05-04 | 中国石油集团工程设计有限责任公司 | A kind of novel mixing homogeneous phase porous sample valve |
CN107063760A (en) * | 2017-03-13 | 2017-08-18 | 苏州安利化工有限公司 | Vacuum sampling valve and fast sampling method |
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