• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a valve device (101) for shutting off and opening a sample gas and / or Kalibriergasstromes to an analyzer of a gas detection system. The valve device (101) has a flow housing (10) with inlet (12) and outlet (21), an electromagnetic, bistable actuator (56) with coil (60; 62), core (63; 64) and axially movable armature (68 ), which is held at least in an end position by a permanent magnet (66), a valve unit (74), which has a valve rod (76) and an associated valve closing body (84) and with the armature (68) is movable, a valve seat ( 24), on which the valve closing body (84) can be lowered and from which it can be lifted and which is arranged in the flow housing (10) between the inlet (12) and outlet (21) and an optical position sensor (102) on the at least one closed position the valve unit (74) is detectable. According to the invention, one or more electrical heating elements are located in the flow housing (10) and the electromagnetic actuator (56) protrudes from a push rod housing (52) at an end of a push rod housing (52) opposite the flow housing (10), which is spaced from the flow housing (10). is arranged, wherein the armature (68) via a pin-shaped element (70) and a push rod portion (72) made of thermally insulating material with the valve rod (76) is connected.
    公开号:AT520721A4
    申请号:T50228/2018
    申请日:2018-03-19
    公开日:2019-07-15
    发明作者:Volker Pointner Dr；Ing Schimpl Thomas；Thomas Sommer Ing；Strutz Michael
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    Valve device for shutting off and opening a gas flow to a
    Analyzer of a gas measuring system
    The invention relates to a valve device for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas measuring system with a flow housing having at least one inlet and an outlet, an electromagnetic actuator with at least one coil, a core and an axially movable armature, a valve unit having a valve rod and a valve closing body connected to the valve rod and is movable with the armature, a valve seat on which the valve closing body is lowered and from which the valve closing body is lifted and which is arranged in the flow housing between the inlet and the outlet and a position sensor, is detectable via the at least one closed position of the valve unit.
    Such valve devices with electromagnetic actuator are known from a variety of applications. In gas measuring systems and in particular in known exhaust gas measuring systems, these valve devices serve to open and block the sample gas lines, calibration gas lines and / or purge gas lines leading to an analyzer of such an exhaust gas measuring system. Usually, the gas lines present in the flow housing are heated in such a use to heat the gas to be passed to the analyzer to a constant temperature, whereby reproducible measurement results can be achieved in the analysis. As actuators of the switching valves electromagnets are used, which are held via a spring element in one of its end positions, while in the other end position a permanent energization for holding the valve in this position is required. For this reason, a separate valve is usually used for each off and zuzuschaltenden gas stream, the normal position in which acts only the spring force, respectively, the position that is usually taken during operation to reduce power consumption. This means for the valve, which controls the sample gas flow, that this is held by the spring force in the open position, while the valves are closed to control the Spülgas- or Kalibriergasströme in the normal position.
    Thus, from AT 511 925 B1 a filter-valve unit is known, in which the sample gas flow from the filter unit flows into the flow housing of the valve unit and there closed or released via the valve body, a flow path to the analyzer. This valve is closed in its normal position. Another flow path can be opened in this valve along the valve stem via a separate valve to initiate a Kalibriergasstrom or a purge gas stream. In this operating state, the valve is moved by energizing the electromagnet in its open for the sample gas flow position. In order to set the correct temperature of the sample gas flow, a heating device is provided on the filter unit.
    A disadvantage of such a valve is that a plurality of valves must be switched in order to release the corresponding streams to the analyzer. Furthermore, the correct positioning of the valve closing body is not traceable, so that in case of errors on the actuator or the valve, such as sticking or jamming in one of the positions can not be detected immediately. In addition, the power consumption of such a valve is relatively high.
    It is therefore the object to provide a valve device for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas detection system available, can be saved with the components, a detection of the correct operation is possible and the energy consumption can be reduced.
    These objects are achieved by a valve device for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas detection system having the features of the main claim 1.
    The fact that the position sensor is an optical position sensor and the electromagnetic actuator is designed as a bistable actuator whose armature is held by a permanent magnet at least in one of its end positions, the power consumption can be significantly reduced, since only the position change of the valve unit power is needed while in the end positions no energizing to hold the valve unit is required. In addition, the position of the valve unit in the end positions can be detected, so that it can be determined whether the valve body releases or shuts off the sample gas flow.
    Preferably, the flow housing has a second inlet and a second valve seat is formed in the flow housing between the second inlet and the outlet, which is releasable and closable by means of a valve closing body, which is connected to the valve unit. Accordingly, it is possible to switch back and forth between two gas flows through a single valve unit and to detect this accordingly. This means that it is possible to dispense with additional valves. For example, either an analyzer can be supplied with the sample gas flow either with a calibration gas flow or a purge air flow or in the other position of the valve unit.
    In a further advantageous embodiment, the outlet between the first inlet and the second inlet is formed and the first valve closing body and the second valve closing body are formed at opposite axial ends of a valve closing member. Accordingly, a simple structure of the valve device having only one valve closing body closing in two directions can be realized, thereby reducing the number of parts to be assembled.
    In a particularly preferred embodiment of the invention, the armature is held in its two end positions by the permanent magnet, which is arranged between two coils of the actuator. A spring element can be omitted accordingly and the bistability is ensured by the permanent magnet, which can be formed directly in the region of the coil and acting on the armature. Such an electromagnetic actuator can be formed either with two coils at the opposite axial ends of the armature for movement of the armature in the different directions or with only one coil, which, however, can be acted upon by switching with an alternating polarity, whereby a force in both opposite Directions can be generated.
    Preferably, the optical sensor has two light barriers whose light beam is interrupted in the end positions, whereupon an electrical signal can be transmitted to a control unit. The light beam of the first light barrier is correspondingly interrupted in the first end position of the valve unit, while in the second end position of the light beam of the second light barrier is interrupted and the other light beam is released. In the intermediate positions both photocells are released. By interrupting one of the photoelectric sensors, a corresponding electrical signal is generated at the sensor, which is transmitted to the control unit of the valve or a central control unit of the gas detection system, so that in this the current position can be stored and for other circuits, such as a beginning of Measurement can be used.
    Advantageously, the valve unit has at least one projection, by means of which the light beam of the light barrier can be interrupted. The arrangement of the projection directly detects the position of the valve unit by the optical sensor. For this purpose, no additional parts to be assembled are needed, so that the assembly is facilitated.
    In particular, it is advantageous if the valve unit has a single projection whose axial extent is the distance between the two light barriers reduced by the maximum stroke of the valve unit, so that in each end positions of the light beam in each case one of the two light barriers is interrupted. This also facilitates the assembly, since only one projection is sufficient for communication with both light barriers and errors in the assembly of two projections can be avoided in this way. Furthermore, in the manufacture of the projection, only the tolerances with respect to the valve lift and the distance of the light barriers must be considered in order to achieve exact results.
    Furthermore, the projection is preferably formed on a push rod portion of the valve unit, via which the armature of the actuator is connected to the valve rod of the valve unit. This simplifies the mounting of the light barriers, since they do not have to be arranged directly in the flow housing, but can be arranged in a separate housing. As a result, the thermal load of the sensors is reduced, whereby they have a significantly longer life. The same applies to the electromagnetic actuator, which is arranged at a greater distance from the flow housing.
    The valve closure member is advantageously attached to the valve rod, which is made of a thermally insulating material. This may be, for example, a polyetheretherketone which has a very low thermal conductivity and a high temperature resistance. Accordingly, the valve closure member itself can be made of any other material, while the
    Insulation is produced by the valve stem. Through this insulation, heat conduction in the direction of the heat-sensitive actuator via the valve rod and the push rod section is significantly reduced, so that it is much better protected against overheating.
    An additional heat shield against a heated flow housing results when the actuator and the push rod portion are arranged with the optical position sensor in a push rod housing which is secured by screws to the flow housing, wherein a valve rod guide body is fixed in the flow housing and so protrudes into an opening of the push rod housing, the push rod housing is arranged at a distance from the flow housing. Thus, heat conduction from the flow housing to the push rod housing and thus to the actuator and the sensors is avoided. In addition, a heat shield for reducing the heat radiation from the flow housing to the actuator is achieved by the push rod housing.
    On the valve rod guide body, the second valve seat is preferably formed, whereby the assembly and manufacture of the valve seat and thus the assembly of the valve unit in the housings is significantly simplified.
    Preferably, one or more electrical heating elements are arranged in the flow housing, via which the sample gas stream can be heated to a constant temperature of for example 190 ° C, whereby the measurement results of the analyzer, such as a flame ionization detector are significantly improved and reproducible.
    In a further development of the invention, the control of the electric heating elements is infinitely variable by means of pulse width modulation. The control by means of PWM signals a very accurate and low-loss control is possible, which is independent of the applied voltage.
    There is thus provided a valve device for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas detection system, which is simple in construction and assembly, reduces the number of necessary valve devices in a gas detection system and the
    Power consumption reduced. Thus, the assembly operating and manufacturing costs are significantly reduced compared to known designs. In addition, a reliable bearing feedback, which has a long life, integrated, by the correct operation of the valve is verifiable at any time.
    A non-limiting embodiment of a valve device according to the invention for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas detection system is shown in the figures and will be described below.
    FIG. 1 shows a perspective view of a device according to the invention
    Valve device;
    Figure 2 shows a side view of the valve device shown in Figure 1 from the left;
    Figure 3 shows a first view of a valve device according to the invention in a sectional view along the line A-A in Figure 2; and
    Figure 4 shows a second view of the valve device according to the invention in a sectional view along the line B-B in Figure 2, wherein the section is rotated by approximately 45 ° to the section shown in Figure 3.
    The valve device 101 shown in the figures is arranged upstream of an analyzer, such as a flame ionization detector of an exhaust gas measuring system, and serves to shut off or release a sample gas stream or a calibration gas stream to the analyzer and from a sample gas source. FIG. 1 shows a perspective view of the valve device 101 according to the invention, while FIG. 2 shows a view from the left, the left being understood here in the sense of the illustration in FIG. The sectional views of Figures 3 and 4 are along the line A-A (Figure 3) and the line B-B (Figure 4) shown in Figure 2.
    The valve device 101 has a flow housing 10, in which a first inlet 12 is formed, which is supplied via a gas nozzle 14 with a sample gas stream, wherein the gas nozzle 14 has a radial inlet 16 and two extending to opposite directions axial outlets 18, 20, one of which is fixed in the inlet 12 of the flow housing 10 via a thread and thus opens in the inlet 12. Furthermore, out of a valve chamber 22 of the flow housing 10, an outlet 21 leads radially outward and to the analyzer. Between the inlet 12 and the outlet 21, a first valve seat 24 formed as a constriction is formed in the valve chamber 22.
    At the flow housing 10, a second inlet 26 is still formed, which is supplied via a likewise screwed into the flow housing 10 Kalibriergasstutzen 28 with a Kalibriergasstrom. In the flow housing 10 are electrical heating elements (not shown) and receiving bores 30 for external temperature sensor (not shown) for checking the temperature or function of the heating elements. The heating elements are infinitely variable via pulse width modulation, so that the valve chamber 22 of the flow housing 10 and thus also the gas flowing through the valve chamber 22 can be regulated to a constant temperature. The temperature sensor used for the control and the temperature switch for protection are not shown.
    Furthermore, the flow housing 10 has an opening in the valve chamber 22, in which a pressure sensor section 32 is arranged, wherein by connecting the connecting hose of an external pressure sensor (not shown in the figure), this opening is closed.
    From the first inlet 12 opposite axial side of the flow housing 10 projects into the valve chamber 22 a Ventilstangenführungskörper 34, at the projecting into the valve chamber 22 section three Umfangsnuten 36, 37, 38 are formed and its axial end in the direction of a shoulder 40 in the valve chamber 22 sticks out. In the first circumferential groove 36 and the third circumferential groove 38, an O-ring 42, 43 is arranged in each case, which lie with its respective outer periphery against the inner wall of the valve chamber 22, so that it is sealed to the outside. The central circumferential groove 37 is arranged axially at the level of the second inlet 26, so that a calibration gas flow can flow into the circumferential groove 37. Furthermore, a bore 44 leads from this circumferential groove 37 into an inner guide space 46 of the valve rod guide body 34, which is connectable to the valve chamber 22. While the sectional view in FIG. 3 shows only such a bore 44, a plurality of such bores can also be provided in the embodiment variant (not illustrated).
    The valve rod guide body 34 is axially against an outer wall of the annular shoulder 48 formed on the outer circumference
    Flow housing 10, while the opposite axial end of the valve rod guide body 34 in a receiving opening 50 of a
    Push rod housing 52 protrudes and abuts there axially. The push rod housing 52 is connected via screws 54 to the flow housing 10, but spaced therefrom, wherein the valve rod guide body 34 serves as a spacer.
    On the push rod housing 52, an electromagnetic actuator 56 is attached, which protrudes on the flow housing 10 opposite end of the push rod housing 52 from this. In an actuator housing 58 of this actuator 56 coils 60, 62 are arranged at the axial ends, which can be energized via a visible in Figure 2 connector 61 and in the interior of each core 63, 64 is arranged. Axially between the two coils 60, 61, a permanent magnet 66 is fixed in the actuator housing 58, which is axially magnetized and has an inner opening 67, in which an armature 68 is movable, which is connected to a pin-shaped element 70, which through the core 64 protrudes.
    In a first position of the armature 68, which is shown in the figures, the armature 68 abuts against the one core 63 and forms with the one pole of the permanent magnet 66 a magnetic circuit.
    In the second switching position, the armature 68 bears against the other core 64 and forms with each of the other pole of the permanent magnet 66 a magnetic circuit. To release the armature 68 from its respective position in each case the acting magnetic field of the permanent magnet 66 is repealed by the electromagnetic field of the respective effective coil 60, 62, wherein the electromagnetic field of the active coil 60, 62 each slightly stronger to the armature 68th to move to its other switching position.
    Since the effective electromagnetic forces for moving the armature 68 must act in opposite directions to move the armature 68 to both switch positions, the two coils 60, 62 are oppositely poled. In the end positions is in such a design no
    Energization for holding the armature 68 is required because the force of the permanent magnet 66 is sufficient for reliable holding.
    The end of the pin-shaped element 70 of the armature 66 protrudes from the actuator housing 58 in the push rod housing 52 and is connected to a push rod portion 72 of a valve unit 74. At the opposite end of the push rod portion 72 of a thermally insulating material to minimize the heat input into the actuator 56, a valve rod 76 is fixed, which extends from the push rod housing 52 through the valve rod guide body 34, in whose interior a shaft seal 77 is disposed, into the valve chamber 22 , At this axial end of the valve stem 76, a valve closure member 78 is secured by means of a threaded portion 82 extending from the valve closure member 78 into a threaded opening 80 of the valve stem 76.
    Valve closure member 78 includes two valve closure members 84, 86 which correspond in axially opposite directions to first valve seat 24 and second valve seat 88, respectively, formed at the end of valve stem guide body 34.
    The valve closing bodies 84, 86 each have a circumferential groove 90, 92, in each of which an O-ring 93, 94 is arranged, with which the valve closing body 84, 86 rests on the corresponding valve seat 24, 88, so that a high tightness is achieved ,
    The shaft seal 77 abuts radially outward on the valve rod guide body 34 and radially inward on the valve rod 76, so that a gas flow from the valve rod guide body in the direction of the push rod housing 52 is prevented. Furthermore, the valve rod 76 has a guide portion 99, with which the valve rod 76 slides on the inner wall of the valve rod guide body 34 along.
    In order to be able to detect the respective position of the valve closing member 78 and thus to be able to understand whether the respectively actuated position of the valve closing body 84, 86 has actually been assumed is on
    Push rod portion 72 formed in Figure 4 to be recognized projection 100, which corresponds to an optical position sensor 102.
    The optical position sensor 102 consists of two light barriers 104, 106, which are arranged in the push rod housing 52 and spaced from each other, the axial extension of the projection 100 added to the maximum stroke of the valve closure member 78 between the two valve seats 24, 88 corresponds, so that in both end positions respectively just the light beam of one of the two light barriers 104, 106 is interrupted by the respective end of the projection 100, while in the intermediate positions both light barriers 104,106 are released.
    Upon interruption of the light beam, an electrical signal is sent to a control unit 108 via an electrical line, not shown, through the respective light barrier 104, 106, that the end position has been properly achieved.
    Optionally, the electrical line can also be connected to the actuator 56, so that upon reaching the respective position the energization of the electromagnetic actuator 56 is set or not made again, since the valve unit 74 is held in the end positions by the permanent magnet 66.
    When functioning properly, the energization of the actuator 56 is only for a short period of time, e.g. 1 second, because it is already possible to change the end positions. If the position is not held by the permanent magnet 66, then the signal of the hitherto hidden light barrier 104, 106 changes when leaving this position, which can be concluded that an error.
    In the figures, the valve unit 74 is shown in the Kalibriergasstutzen 28 and thus the second inlet 26 occluding position. The second valve closing body 86 rests on the second valve seat 88, while the first inlet 12 is fluidically connected to the valve chamber 22 and thus to the outlet 21. In this state, sample gas flows to the outlet 21 and thus in the direction of the analyzer. The projection 100 covers the light barrier 104, so that the control unit 108 receives a corresponding signal and registers a correct end position, since the armature 68 and thus the valve unit 74 is held in its position by the permanent magnet 66. Upon completion of the measurement, an electrical signal to the second coil 62 is sent by the control unit 108 so that it is energized and the armature is moved in the direction of the second coil 62 until the armature plate facing away from the coil 60 against the
    Permanent magnet 66 is applied. Thus, the valve unit 74 is simultaneously displaced, so that the second valve closing body 86 is lifted from the second valve seat 88 and the first valve closing body 84 abuts against the first valve seat 24. Accordingly, sample gas can no longer flow to the outlet 21.
    Instead, a calibration gas stream can now flow from the calibration gas nozzle 28 into the valve chamber 22 and thus via the outlet 21 to the analyzer. During the movement of the armature, the projection 100 simultaneously shifts, so that the light barrier 104 is released and upon reaching the second end position, the projection 100 covers the other light barrier 106. The resulting signal is used by the control unit to detect a correct reaching the end position. The energization of the coil 62 of the bistable actuator 56 is completed, so that now the armature 68 and the valve unit 74 are held by the permanent magnet 66 in its second end position and the analyzer is supplied without power consumption with calibration gas. Upon completion of the calibration, the movement is again in the reverse direction by energizing the other coil 60th
    The valve device 101 according to the invention is therefore suitable for switching between two gas streams with the lowest power consumption and safe operation, since the position of the valve unit is monitored at all times, in particular in the end positions by the optical sensor. The manufacturing and assembly costs are reduced since it is possible to switch over between the sample gas stream and the calibration gas stream of an analyzer with only a single valve device 101.
    It should be clear that other optical sensors or other bistable electromagnet can be used as an actuator, without departing from the scope of the main claim. Also, such a valve device 101 may be switched in front of different analyzers or instead of the calibration gas flow, a purge gas stream may be used as the second port. Other design changes, such as the use of two spaced projections instead of a projection are also conceivable. Also, the valve closing bodies may be formed as two separate bodies.
    权利要求:
    Claims (13)
    [1]
    A valve device (101) for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas measuring system with a flow housing (10) having at least one inlet (12) and an outlet (21), an electromagnetic actuator (56) with at least a spool (60; 61), a core (63; 64) and an axially movable armature (68), a valve unit (74) having a valve stem (76) and a valve closing body (84) connected to the valve stem (76) and with the armature (68) is movable, a valve seat (24) on which the valve closing body (84) lowered and from which the valve closing body (84) can be lifted and in the flow housing (10) between the inlet (12) and the outlet (21) is arranged, a position sensor (102) via which at least one closed position of the valve unit (74) is detectable, characterized in that the position sensor is an optical position sensor (102) and the electromagnetic He actuator (56) is designed as a bistable actuator whose armature (68) is held at least in one of its end positions by a permanent magnet (66).
    [2]
    2. Valve device (101) for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas measuring system according to claim 1, characterized in that the flow housing (10) has a second inlet (26) and a second valve seat (88) between the second inlet (26) and the outlet (21) is formed, which is releasable and lockable by means of a second valve closing body (86) which is connected to the valve unit (76).
    [3]
    3. Valve device (101) for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas measuring system according to claim 2, characterized in that the outlet (21) between the first inlet (12) and the second inlet (26) is formed and the first valve closing body (84) and the second valve closing body (86) are formed at opposite axial ends of a valve closing member (78).
    [4]
    4. Valve device (101) for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas detection system according to one of the preceding claims, characterized in that the armature (68) is held in its two end positions by the permanent magnet (66).
    [5]
    5. Valve device (101) for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas detection system according to one of the preceding claims, characterized in that the optical position sensor (102) has two light barriers (104, 106) whose light beam in the end positions is interrupted, whereupon an electrical signal to a control unit (108) is transferable.
    [6]
    6. Valve device (101) for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas measuring system according to claim 5, characterized in that the valve unit (74) has at least one projection (100), by means of which the light beam of the photoelectric sensors ( 104,106) is interruptible.
    [7]
    7. Valve device (101) for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas measuring system according to claim 6, characterized in that the valve unit (74) has exactly one projection (100), the axial extent of the distance between the two Light barriers (104, 106) reduced by the maximum stroke of the valve unit (74), so that in both end positions of the light beam in each case one of the two light barriers (104, 106) is interrupted.
    [8]
    8. Valve device (101) for shutting off and opening a sample gas stream and / or a calibration gas stream to an analyzer of a gas measuring system according to one of claims 6 or 7, characterized in that the projection (100) on a push rod portion (72) of the valve unit (74). is formed, via which the armature (68) of the actuator (56) with the valve rod (76) of the valve unit (74) is connected.
    [9]
    9. Valve device (101) for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas detection system according to any one of the preceding claims, characterized in that the valve closing member (78) on the valve rod (76) is fixed, which from a thermally insulating material is made.
    [10]
    10. Valve device (101) for shutting off and opening a sample gas stream and / or a calibration gas stream to an analyzer of a gas measuring system according to one of the preceding claims, characterized in that the actuator (56) and the push rod section (72) with the optical position sensor (102). in a push rod housing (52) are arranged, which is fastened by means of screws (54) on the flow housing (10), wherein a valve rod guide body (34) in the flow housing (10) is fixed and in such a receiving opening (50) of the push rod housing (52) protrudes in that the push rod housing (52) is arranged at a distance from the flow housing (10).
    [11]
    11. Valve device (101) for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas measuring system according to claim 10, characterized in that the Ventilstangenführungskörper (34) of the second valve seat (88) is formed.
    [12]
    12. Valve device (101) for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas detection system according to one of the preceding claims, characterized in that in the flow housing (10) one or more electrical heating elements are arranged.
    [13]
    13. Valve device (101) for shutting off and opening a sample gas stream and / or a Kalibriergasstromes to an analyzer of a gas detection system according to claim 11, characterized in that the control of the electric heating elements is carried out continuously by means of pulse width modulation.
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    同族专利:
    公开号 | 公开日
    AT520721B1|2019-07-15|
    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50228/2018A|AT520721B1|2018-03-19|2018-03-19|Valve device for shutting off and opening a gas flow to an analyzer of a gas measuring system|ATA50228/2018A| AT520721B1|2018-03-19|2018-03-19|Valve device for shutting off and opening a gas flow to an analyzer of a gas measuring system|
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