DE2420599A1 - Gas separator for gases in highly fluid liquids - has separating chamber with vent at its top and liquid level gauge - Google Patents

Abstract

The gauge operates the vent in accordance with the liquid level, and shut-off valve is provided in the outlet behind a flowmeter. The gas separator housing has an annular inelt chamber, connected at its lower end to the inlet pipe, and with the main chamber only along its top end. The outlet opens near the main chamber bottom. An evaluating device has an upper and a lower float responding to different liquid levels, and an interacting control device opens or closes the vent when both floats tend to move in the same direction. The inlet duct is arranged so that the liquid is led in tangential to the inlet chamber.

Description

Gas Detector The present invention relates to a gas detector for separating gases from thin liquids with an inlet and having an outlet connection for the liquid flowing through Gas separator, the upper space of which can be vented through a venting device, a detection device sensing a liquid level in the upper space, which actuates the venting device in accordance with the fluid level, and a shut-off device connected downstream of the outlet connection via a flow measuring device.

There are devices of the aforementioned type known in which the Liquid radially into a gas separation chamber, which has a vent valve at its upper end has, which with the help of a float according to the liquid level detected by this open or

can be closed, being initiated in the liquid contained gases under the action of gravity through the liquid to their Surface should rise. However, this known arrangement allows only one relatively low flow rate of the liquid and thus a correspondingly low flow rate per unit of time, since the rate of rise of the gas bubbles is limited and a rise of the same also makes the liquid flow is hindered. In addition, such an arrangement occurs when there is an increase the flow velocity additionally intensifying turbulence in the liquid flow on, which additionally hinder the rise of the gas bubbles and with appropriate Strength at the surface of the liquid, especially in an impact area on the float, additional amounts of gas can be drawn into the liquid. Finally, in such a known arrangement, it also appears disadvantageous that the vent valve through the float device during operation of the arrangement kept open by an amount corresponding to the amount of gas produced is, so that in one by the flow conditions or the mode of operation Liquid feed pump-induced occurrence of negative pressure in the gas separator proper operation of the gas meter is not guaranteed.

To avoid the latter disadvantages is one arrangement known with a capacitive sensing device for detecting the liquid level, those extending opposite one another into the surface of the liquid and plates connected to more electrical evaluation devices have their ineffective ones Capacity against each other due to the level of the liquid acting as a dielectric is correct whereby the evaluation circuit always causes a venting process, if a predetermined minimum value of the effective rapacity is achieved by a corresponding one Lowering of the liquid level or a corresponding enrichment of the between Liquid with gas bubbles in the plates appears to be disadvantageous here in particular that the operation of such an arrangement is to a great extent is influenced by the liquid to be degassed in each case Liquids corresponding to different dielectric constants are effective so that a proper operation only with one particular liquid is guaranteed. Also, the requirements provided in this arrangement require an introduction electrical energy in a possibly filled with highly explosive gases Gas collection space because of the possibility of sparking expensive measures in terms of of explosion protection.

The object of the present invention is to provide a gas meter to create the type mentioned at the beginning, under Avoiding the disadvantages the known arrangements ung even at higher conveyor speeds and with different Liquids works effectively, reliably and safely.

This object is achieved according to the invention in that the housing of the gas separator has an annular inlet chamber, which is at a lower End with the inlet port and only along an upper end with a main chamber communicates, the lower end of which communicates with the outlet port, and that the detection device has an upper and a lower float device, designed to respond to staggered liquid racks and are arranged, and a control device cooperating with these for has the venting device, which when both float devices are actuated in the same direction causes the venting device to open or close.

As a result, the ascent of the initiated in an advantageous manner Liquid contained gases through the in the inlet area forcibly in the direction supports liquid to be flowing on the liquid surface without this upward flow with a downward flow in the main chamber Flow in contact, so that a training of flow turbulence is avoided with the disadvantages outlined above. At the same time, the In a particularly advantageous manner, the route to be flowed through in the gas separator extended considerably in areas adjoining the liquid surface, so that degassing of the liquid is further promoted. Through the according to the invention, the flow is guided essentially in a laminar manner from the inlet to the outlet connection it is also ensured that no flow-related mixing is different strongly degassed parts of the liquid can occur. In addition, the According to the invention provided arrangement of two float devices a digital one Control of the ventilation device, so that the ventilation device only after the accumulation of a predetermined amount of gas required to vent it is opened for a relatively short time, the vented amount of gas and thus the venting intervals are not influenced by the properties of the liquid itself and only determined by the amount of gas contained in the liquid are.

In the drawings: Fig. 1 is a sectional view of an embodiment a gas separator according to the invention with venting and shut-off device and one shown schematically control device according to the invention to operate them; FIG. 2 is a block diagram of the control device according to FIG. 1; 3 shows a sectional view of an embodiment of a control device according to the invention; 4 shows a sectional view of an embodiment of a float device according to the invention, that the float device in a fully activated and a non-activated State shows.

In Fig. 1 is an embodiment of the gas separator according to the invention 10 shown with a housing 11 of substantially circular cross-sections, which has an inlet connection 12 and an outlet connection 14, which are integrally are connected to the housing 11. The inlet 12 is from a side wall portion 13 of the housing 11 and is arranged so aligned with respect to this, that a liquid flowing through an opening 12a in the side wall portion 13 is introduced tangentially into an annular inlet chamber 16. The liquid is deflected by the side wall section 13 on a circular path and spirals over an upper region of the inlet chamber with steadily increasing Ring diameter on. The inlet chamber 16 is opposite a main chamber 18 of the gas separator 10 by an inner one that is integrally connected to the housing 11 on the underside thereof Rammerwandabschnitts20 delimited, which is otherwise essentially parallel extends upward to the side wall portion 13 inside the housing and in a substantially horizontally angled gas-catching flange 17 ends which is in rich device on the side wall portion 13 to over part of an upper end the inlet chamber 16 extends. above the top of the inlet chamber 16 is the side wall section in the shape of a circular arc around an approximately in the middle of the gas catching flange 17 the imaginary center of the circle is arched inwards and merges inwards extending wall extension 22, which is integral with the side wall section 13 connected and the curvature uniform up to a traverse of nearly 1800 continues and then tapers in a funnel shape towards the main chamber 18 to extends. The wall extension 22 delimits it with the opposite areas of the chamber wall portion 20 has an annular connecting channel 24 between the upper end of the inlet chamber 16 and the main chamber 18 and separates the connecting channel 24 from a gas collection chamber 26, the upper end of which is covered by a cover wall section 15 of the housing 11 is closed and its lower end through one of the end of the wall extension 22 limited circular line Opening 25 with the Main chamber 18 is in communication.

The chamber wall section forming the inner wall of the inlet chamber 16 20 is in an area adjoining the gas catching flange 17 on at least one Place connected in one piece to the wall extension 22 by at least one support member 19, each support member 19 having a substantially perpendicular connecting bore 21 between the area of the inlet chamber 16 adjoining the gas catching flange 17 and the gas collection chamber 26. Between the upper area 16a and the on The area of the inlet chamber 16 adjoining the inlet 12, the housing 11 has a Separation surface 23 on 9 the separate production of a wall extension 22 and the widening upper 3region 16a of the inlet chamber and one of the inlet 12 and the area of the inlet chamber 16 adjoining this, as well as the outlet connection 14 having part of the housing 11 and after a (not shown) Tying means such as clips, screws and / or glue produced Binding of the two parts ensures a tight seal of the housing to the outside, while corresponding parts of the chamber wall section 20 by means of a substantially annular support device 20a made of elastic material sealingly with one another are connectable.

Of course, the parts of the chamber wall section 20 can also designed for a directly sealing system be. Of the The bottom of the main chamber 18 protrudes over an inside of the housing 11 / extends essentially perpendicular to this and is integral with it a lower side wall portion 27 of the housing 11 formed outlet chamber 28 with the outlet connection 14 directed opposite to the inlet connection in Link. Of course, the outlet connection 14 can also be connected directly to a Bottom wall portion 29, but the arrangement will be with an outlet Elbow 28 is preferred in order to prevent deposits possibly entering the gas separator 10 Solid bodies to favor and prevent about when performing Assembly work Debris through the outlet 14 in a downstream flow meter 48 can fall.

The cover wall section 15 has a vent valve arranged thereon 31, which in a non-actuated state by means of a with the force of a Spring 34 acted upon in the closing direction valve body 36 one in the cover wall section 15 provided vent opening 36a keeps sealingly closed. Also wears the cover wall section 15 is an eccentric extending through this sealingly arranged upper float device 50 and a likewise sealing through the same extending, centrally arranged lower float device 51, the can be actuated by changing the liquid level in the gas collection chamber 26 are, the upper float device 50 responding to a change of the fluid level in a predetermined upper range and the lower Float device 51 to such a change in a predetermined lower Area.

The float devices 50, 51 are connected via lines 52, 53, respectively connected to an assigned input 134 or 136 of a control device 430 and form with this a detection device 40. An input connection 132 of the control device 430 is connected via a line 41 to a throttle point 42, the other The end of a line 44 is connected to an air supply 100, which has a On-off switching device 102, in a manner to be explained, a loading of the Line 44 with pressurized air supplied from an air source 101 allowed. With the line 41 control input 32 of a first threshold switch 33 and a control input 122 of a third threshold switch 123 are connected. Of the The first threshold switch 33 is connected to the line via a supply connection 35 44 and via line 43 to an actuating device 38 of the vent valve 31 connected, while the third threshold switch 123 via a supply connection 125 also with the line 44 and via a line 45 with an actuation device 128 of a shut-off valve 121 is connected. The shut-off valve 121 is the flow meter 48 and has a Valve opening 126a, which is shown in a non-operated state of the shut-off valve 121 by one with the force a valve body 126 acted upon again in the closing direction, you tend to close is held.

To explain the mode of operation of the gas metering device according to the invention 1 it is initially assumed that one of the liquid level in the gas collection chamber 26 is at the upper value and that the air supply 100 and a (not frame set) conveyor for the liquid, such as a centrifugal pump, switched on is. In this case, the detection device blocks in more detail below To be explained, an air flow through the line 41, so that an air pressure in line 41 is the same as that in line 44, whereupon the threshold value switch 33, 123 cause the line 43 to be depressurized in a manner to be explained further is, while the line 45 is acted upon with a pressure signal9 that the valve body 126 of the shut-off valve 121 holds in an open position, so that the conveyor in the inlet 12 of the gas separator 10 entering liquid via the in its Outlet 14 downstream counter 48 and this downstream counter connection 129a of the shut-off valve 121 through a valve opening that has now been released 126a and output connection 129 of the shut-off valve connected to this 121 can promote.

The liquid passes tangentially over the opening 12a in the inlet chamber 16, in which they spiral circumferentially to the upper end flows Here, a centrifugal effect corresponding to the speed of rotation is created obtained 2 due to the different specific gravity of the liquid and gas bubbles present or forming in the liquid and in cooperation a rise of the gas bubbles in one of the chamber wall section with the force of gravity 20 causes adjacent area of the inlet chamber. The kind from the liquid Excreted gases are through the gas catch flange 17 at an entry into the Connecting channel 24 prevented and via the connecting channel 21 directly into one upper area of the gas collection chamber 26 passed. The one in an upper calibration 16a at steadily increasing ring diameter of the inlet chamber in a substantially constant ring width 16 is designed in such a way that 9 the part of the chamber wall adjacent to this section 20 with the gas catch flange 17 the area of the inlet chamber adjoining the inlet 12 16 superimposed in the vertical direction, so that also almost vertical ascending Gas bubbles, such as when the liquid circulates at a low speed, can be detected with certainty by the gas catch flange 17. At the same time will thereby an increasing enlargement of the chamber volume towards the upper end of the inlet chamber achieved so that no fluid build-up causing flow turbulence on the Gas catch flange 17 occurs and the separation and interception of the gases under the gas catch flange 17 is favored. The due to the increasing swing diameter simultaneously decreasing circulation speed of the liquid further contributes to the Avoidance of vortex formation in the liquid when it passes into the connecting channel 24 at, the liquid through the continuously merging, circular arc-shaped curved areas of the side wall section 13 and the wall extension 22 as well diverted without vortex formation in the downward connecting channel 24 and in a downward spiral-shaped flow with decreasing orbital diameter and into the main chamber 18 with a correspondingly increasing circulation speed is initiated. Any gas bubbles that may still be formed in the liquid are thereby formed due to the previously described centrifugal effect in the direction of the connecting channel 24 adjacent area of the wall extension 22 to be displaced and by the downward directed flow is transported to the opening 25, through which it enters the gas collection chamber 26 enter. The main chamber 18 has a much larger cross-sectional area, as the inlet chamber 16 or the connecting channel 24, so that the downward The flow velocity of the liquid is much lower here, while the Circulation speed of the liquid in particular in an adjacent to the opening 25 and the area surrounded by the inlet area of the inlet chamber 16 is still relatively is high, so that possibly still in the form of gas bubbles in the main chamber 18 to the liquid separated gas residues the gas collection chamber 26 can rise and thereby supplied to the opening 25 by the centrifugal effect will.

After accumulating a predetermined amount of gas and a corresponding one The detection device brings about a decrease in the level of liquid in the gas collection chamber 26 in a manner to be explained, an air flow through the line 41, which mediates the throttle point 42 results in a corresponding pressure drop in the line 41 Has. This drop in pressure at the control passages 32, 122 brings about the threshold value switch 33 or 123 for the duration of the pressure drop to respond. When the threshold switch responds 33 this applies pressure to the line 43 and thus actuates the actuating device 38 of the vent valve 31, which then releases the vent opening 36a, so that the gas contained in the gas collection chamber can escape into the atmosphere.

At the same time, the response of the threshold value switch 123 the line 45 depressurized that the valve body 126 of the shut-off valve 121 through the force of the spring 124 for sealing contact with the valve opening 126a is brought and thus the liquid flow through the entire arrangement interrupts. This advantageously ensures that the when flowing through Liquid in the gas separator prevailing pressure conditions have the venting process so that venting can be carried out quickly and especially too in the case of flammable liquids only during an open connection between the Gas collection chamber 26 and the atmosphere was also ensured Such an arrangement ensures proper operation even in those cases where with flowing liquid temporarily or permanently negative pressure in the gas collection chamber prevails, for example due to the flow conditions or the arrangement of the Conveyor.

After one by the detection device 40 by means of its float devices 50, 51 perceived increase in the liquid keitsstandes in the gas collection chamber 26 a predetermined value, the detection device 40 in turn blocks the BS tn flows through line 419 whereupon the pressure in line 41 rises again and the threshold value switches 33, 123 and the valves 319 121 controlled by them again assume the condition described at the beginning9 so that again liquid from the inlet 12 of the gas separator 10 to the outlet connection 129 of the shut-off valve 121 As can be seen, the valves 31, 121 are advantageously so designed that when the air supply is switched off with the aid of the springs 34, 124 are automatically brought into the closed position or held in this. This ensures that even if the air supply fails, be it during delivery of liquid or when the gas meter is not in operation a secure closure of the shut-off valve 121 and the vent valve 31 ensured. In addition, the rain and operating devices of the arrangement can of course also work with fluids other than air, or electrically, with im the latter ball the controls and the various parts of the Control circuit by the specialist world generally familiar, analog acting electrical Components are to be replaced.

Fig. 2 shows a block diagram of the control circuit on the basis of which the interaction of the individual parts using the example of a pneumatically operated The control circuit is to be explained in more detail. The upper float device 50 closes in a raised position of an associated float 57 with a sealing their connected end of the line 52 and are in a lowered position of theirs Float 57 a through flow cross-section of a predetermined size to one with the Atmosphere communicating outlet 68 free. Seals in the same way the un-Gere float device 51 in a raised position of its float element 57 sealing the end of the line 53 connected to it and is in a lowered position Location of their float element 57 has a flow cross-section of a predetermined size to an outlet 68 which is also in communication with the atmosphere. That the other end of the line 52 is connected to a first float connection 134 the Control device 130 connected, while the other end of the line 53 with their second float connector 136 is connected. The second float connection 136 is up with a sensing line 141 in connection, which is connected to one end of a second throttle point 142 is connected, the other end of which via an input line 140 to the input terminal 132 of the control device 130 is connected. The feed line 141 is via a storage element 138 can be connected to the first float connection 134, the control input of which has a Line 145 is connected to the Fühll: line 141 and that when it is actuated in a manner to be explained in more detail, the connection between the line 141 and the first float connection 134 interrupts. The sense line 141 is also over a line 148 with a control input of a second threshold switch 144 connected, the device 146 with a second control input connected via a lever of the input line 140 are also connected to the input line 140 Switching device 152 to the xfeist / when the second threshold switch responds 144 a connection between the input line to be explained in more detail below and an output line 178 produces a predetermined flow area, that is related to the atmosphere. As already described, is the input port 132 connected via a line 141 to one end of a throttle point 142, the the other end via a line 44 to the end discharge line 104 of the air supply 100 is connected.

A substantially the vent valve 31, the line 43 and the first threshold switch 33 comprising venting device 30 has the first Threshold switch a three / two-way .Ventil 33, that when applied its control input 32 with a value below a predeterminable value Pressure a connection between a port connected to the line 43 and a supply connection 35, which is connected to the line 44 in connection. 3if the control input 32 is acted upon with an above the predetermined one The supply connection 35 of the valve 33 is sealed off with a pressure below the value, while the connection connected to the line 43 with one with the atmosphere communicating outlet 39 is connected. The other end of the line 43 is connected to the actuating device 38 of the vent valve 31.

Essentially the (incompletely indicated) shut-off valve 121, the line 45 and the third threshold switch 123 comprising shut-off device 120 has a second three / two-way valve / as the third threshold switch, the control input 122 of which is connected to the line 41. Im represents the third In contrast to the first / three / two-way valve when its control input is activated 122 establishes a connection with a pressure above a predeterminable value between a connection connected to the line 45 and a supply connection 125 produced, which is connected to line 44 stands while it when the control input 122 is acted upon with one below the predetermined one Value lying pressure the supply connection 125 closes sealingly and a connection between the terminal connected to line 45 and one with the atmosphere connected from 119 manufactures. The other end of the line 45 is with the actuator 128 of the shut-off valve 121 connected to the: On-off device 102 of the air supply 100 has a first communicating with air source 101 at one end Line 105, the other end of which is connected to a first switching device 110 is connected and between the ends of a throttle point 107 predetermined Flow cross section is provided. 3The connection to the line is shown in 105 connected / an off position of the switching device 110 of this sealed and one switched on position with one with a second Line 109 connected terminal of the switching device 110 connected. In the switched off The position of the switching device 110 connects it to its connected to the line 109 Connection to an outlet 103 communicating with the atmosphere. The switching device 110 has a hand knob 106, which has an actuator connected to it 106a, depending on the direction of actuation, switching the switching device 110 on or off made possible by hand. The switching device 110 also has a Pneumatic actuator 112 connected to line 109 with a return spring 108, which the switching device 110 in the switched off Position applied. With the line 109 is a limiting device in Xo-em a pressure relief valve 111 connected, which in the switched-on state of the switching device 110 in cooperation with the throttling point 107 increases the pressure in the line 109 limits a predeterminable value. A third line 113, 115 is on one End with the air source 101 and at its other end with a connection of a second Schalteinri rect 114 connected, which is in a switched off state of the switching device 114 is sealingly closed by this, and in a switched-on state of the switching device 114 with a connection connected to the output line 104 is connected. The connection connected to the output line 104 is switched off Position of the switching device 114 with a stand in advertising with the atmosphere Outlet 118 connected.

The second switching device 114 has a type of Lifferentialkolbeneinri Respecting acting pneumatic actuator 116 with an essentially perpendicularly aligned cylinder chamber 117a displaceably arranged piston 117 whose upper effective pressure area is smaller than the lower. The lower end the cylinder chamber 117a is connected to the second line 109, while the upper The end of the cylinder chamber 117a is connected to the third line 113, 115 is. The piston 117 is between a raised position, the switched on State of the second switching device 114 corresponds, and a lowered, the switched off state of the second switching device 114 corresponding position movable.

The mode of operation of the control circuit will now be explained below , it being initially assumed that the pressure of the air source 101 supplied air is within predetermined tolerance limits. In this case is by means of a brief switch-on actuation of the first switching device 110 the line 109 with one over the first. Line 105 supplied and, if applicable limited by the pressure relief valve 111 in cooperation with the Dr.vsselstelle 107 Pressure applied, which is sufficient to the first switching device 110 over their pneumatic actuator 112 against the force of the return spring 108 to keep in the switched-on state. At the same time, the piston 117 becomes the actuating device 116 of the second switching device 114 by the pressure in the line 109 against the the pressure acting on the smaller pressure area in the line 113, 115 shifted so that that the second switching device 114 is switched on, whereupon the output line 104 via the line 113, 115 and the second switching device 114 with under pressure standing air is supplied from the air source 101.

On the other hand, if the pressure of the air supplied by the air source is above one by the ratio of the pressure areas of the piston 117 and the response value of the pressure relief valve 111 predeterminable value, or it increases above this value during operation, the pressure limited to a fixed value can be used in the line 109, the piston 117 does not counteract the excessive pressure in the line 113, 115 to move or to hold, so that the second switching device 114 not switched on or switched off to the following parts of the control circuit to protect against exposure to excess pressure. Is that from the air source 101 output pressure, however, under a perfect operation of the control circuit guaranteed and predeterminable by means of the restoring force of the restoring spring 108 Value, the pneumatic actuating device 112 of the first switching device is capable of 110 not to keep this in the switched-on state, so that the output line 104 the air supply 100 immediately after the release of the manually operated Hand button 106 is again disconnected from the air source 101, since the line 109 at the return element of the first switching device 110 in the switched-off state without pressure will.

For the following description it is now assumed that the air supply 400 is switched on and that the liquid level in the gas collection chamber 26 is sufficient is high to operate both the float devices 50, 51 so that this Close lines 52, 53 in a sealing manner. This has the consequence that no Air flow through the sensing line 141 can take place, so that at the throttle point 142 no pressure drop occurs, so that the pressure in the input line 140 is the same that is in the sense line 141. This means that the control inputs 146 and 148 the same pressure, which, in a manner to be explained in more detail below, causes the Switching device 152 by the force of a spring 150 in a flow to the output line 178 is held in a blocking position9 so that also through the input line 140 and the line 41 connected to it, there is no air flow and the pressure in the Line 41 is consequently the same as that in line 44.

The pressure in line 41 therefore has a sufficiently high 33 value, to operate the first Drei | ZveiWege-VentiV against the force of a spring 37, whereby the line 43 / as already described connected to the outlet 39 and is thus depressurized, so that the spring 34 of the vent valve 31 this keeps closed. At the same time, the second three / two-way valve 123 is also through the pressure in the line 41 is actuated against the force of a spring 127, whereupon in likewise already described, its supply connection connected to line 44 125 is connected to the connection connected to the line 45, via which thus the actuating device 128 of the shut-off valve 121 with a shut-off valve against the force of the spring 124 opening pressure is applied, so that liquid can flow through the shut-off valve. At the same time the control input of the storage element 138 with the substantially corresponding pressure in the line 44, relatively high pressure is applied in the sensing line 141, which is shown in more detail To be explained, an activation of the storage element 138 against the force of a Spring 155 causes the connection between the sense line 141 and the first float connection 134 is interrupted. Therefore, it causes a decrease of the liquid level in the gas collection chamber 26 by one for a response to the upper float device 50 sufficient amount does not change the previously the pressure conditions described and the switching states of the controlled by them Vent valve 31 and the shut-off valve 121, although the line 52 with it the unpressurized outlet 68 is connected.

Only after the liquid level has dropped further to one the sensing line becomes a value sufficient to respond to the lower float device 51 141 via the second float connection 136 and the line 53 with that of this float device associated unpressurized outlet 68 connected so that air from line 44 over the throttle point 42, the line 41, the input line 140, the throttle point 142 and the sense line 141 to the outlet 68 flows. The one here at the throttle point 142 caused pressure drop causes a pressure difference between the control inputs of the second threshold switch 144, which is then to be explained in more detail Way by means of the switching device 152 a direct connection between ~ the Inlet line 140 and outlet line 178 connected to the atmosphere in FIG the way that there is a smaller steady-state pressure drop in the throttle point 142 and a corresponding greater pressure drop at the throttle point 42 results.

The pressure drop at the throttle point 42 is so great that the Pressure in line 140 no longer for actuating the three / two-way valves 33, 123 against the force of the springs 37 and 127 is sufficient so that the three / two-way valves 33 to -123 can be switched by the spring forces / and those shown in Fig. 2 and to the previously described opposite connections between their terminals produce. Here, the line 43 is connected to the supply connection 35 of the valve 33 connected and applied to the actuating device 38 of the vent valve 31 with the PRESSURE in the line 44, which the vent valve against the force of the Spring 34 opens. In addition, the line 45 is connected to the unpressurized via the valve 123 Outlet 119 connected so that the shut-off valve 121 by the force of the spring 124 is closed and interrupts the flow of liquid to its outlet connection 129.

in The pressure drop in the sense line 141, which has almost become depressurized also causes the memory member 138 by the force of the spring 155 in a Switching state is brought to the connection between the sense line 141 and the first float connection 134 releases. One by opening the vent valve 31 by means of the inlet connection in the gas separator 10. liquid allows the liquid level to rise changes the now present Pressure ratios and the switching positions controlled by these - not, when the lower float device 51 now responds to the connection interrupts between the line 53 and its outlet 68, since the air is now over the memory member 138, the first float connector 134, the line 52 and the upper float device 50 su whose pressureless outlet 68 can flow so that the sense line 141 remains almost unchanged and almost pressureless.

Only when one of the upper float devices is reached for actuation 50 sufficient liquid level in the gas collection chamber 26 interrupts the upper Float device 50 the connection between the line 52 and the outlet 68, so that the pressure in the feed line 141 is equal to the value of the pressure in the input line 140 increases. This also turns the two control inputs of the second threshold switch 144 pressurized with the same pressure, so that the switching device 152 in the already described above by the force of the spring 150 in the connection between the input line 140 and the output line 178 interrupting position is brought. This also interrupts the air flow through line 41, so that the pressure in line 41 returns to the value of the pressure in the line 44 rises and the three / two- Directional valves 33, 123 actuated against the force of springs 37 and 127, respectively, whereby line 43 again is depressurized, so that the vent valve 31 by the force of the spring 34 is closed while the bedding 45 is again pressurized, the shut-off valve 121 against the force of the spring 124 in the open position brings, with which the initially described initial state is restored.

Of course, the control circuit according to the invention can also be used operated by another air supply or fluid supply. Even the pressure drop at the throttle point 42 can only be caused by the float devices 50, 51 and without the throttle point 142 and the second threshold switch 144 will. However, the outlined embodiment is preferred because it is more advantageous Way ensures a particularly safe and failure-prone operation of the arrangement. As already eDahnt, electrical operation of the arrangement is also straightforward by replacing the various elements with those working in an analogous manner, the person skilled in the art Common electrical components are easily possible.

Fig. 3 shows a sectional view of an embodiment of the invention Control device 130 with a closure part which can be connected to a housing section 131a 133, in which the input connection 132 is in the form of an axially directed, eccentric arranged bore is provided. The first float connection 134 and the second float connection 136 are in the form of radially directed bores provided in opposite sides of a housing section 131. Of course The connections 132, 134, 136 can also be used in a different way, to the respective application be arranged in an adapted manner. In one the housing sections 131 and 131a comprehensive housing part 183 is a centrally arranged, axially directed stepped Bore 182 is provided, the largest diameter end of which through the Closure part 133 can be closed, and the opposite end of which is a central one has axially directed blind hole which, together with a opening in this radially directed bore through a base point of the first float connection 134 a connecting bore 139 between the float connection 134 and an end wall 158 of a section 161 of tapered diameter of a first cylinder chamber 153 forms. The second float connection 136 is above a radially through its base point and a side wall of the portion 161 guided communication hole 137 with a to the end wall 158 adjacent area of the section 161 in connection. In of the first cylinder chamber 153, a first piston 154 is slidable against the force a spring 155 slidably arranged. One to section 161 of the first cylinder chamber 153 facing second end face of the piston 154 carries a sealing element 162. The sealing element 162 has an axial central bore for receiving a from an axial centric Hole in the second face protruding pin 163, which the sealing element 162 with the piston 154 vertindet. A lip 164 provided radially on the sealing element stands / slides sealing engagement with an adjacent portion of the side wall of the section 161. A region 165 adjoining the second end face and of the piston 154 wide on a tapered diameter and forms with an adjacent area the side wall of the first cylinder chamber 153 an annular space into which the Spring 55 is fully receivable, which extends at one end to one at the area 165 adjacent portion of the piston and at the other end at a second stage 160 of the bore 182 is supported, which forms a transition to the tapered section 161 of the first cylinder chamber 153 forms. The section adjacent to area 165 the side wall of the piston 154 has a radial annular groove 167 for receiving a annular sealing element 168 made of flexible material, the skh in sealing Plant with the adjoining areas of the piston 154 and the side wall of the first cylinder chamber 153 is located. An area adjacent to the second stage 160 of the annular space 166 is via a radial connecting hole 169 and a Filter device 170 in communication with the atmosphere. A first face 156 of the piston is in its non-actuated position by the force of the spring 155 held in contact with one of these oppositely arranged wall element 184, while an oppositely directed first sealing surface 157 of the sealing element 162 to a system sealing the bore 139 with the end wall 158 is brought. The first piston 154 acts as a switching element of memory member 138.

Between the wall member 184 and the closure member 133 is a second Cylinder chamber 171 for receiving a slidably displaceable in this second piston 172 is provided. The second piston 172 has in one of the closure part 133 facing first end face 173 an axial central blind hole 179 for holding receptacle of a substantially cylindrical sealing element 180 elastic material. At an area protruding beyond the first end face 173 of the sealing element 180, a second sealing surface 175 is provided, which is used for sealing System is designed with an end wall 176 provided on the closure part 133 and one end of a central axial blind hole 177 through the end wall 176 locks.

From an outer edge of the closure part 133 is a radial bore 178 led into the blind hole 177, which together with this one with the atmosphere connected output line forms. A second face 174 of the second Piston 172 has a second blind bore 181 for receiving part of the spring 150, which acts on the piston 172 in the direction of the end wall 176 and their other end in an opposite section of a central axial stepped through hole 145 received through the wall element 184 is. The second piston 172 forms the movable switching element of the second threshold switch 144.

The wall element 184 has a first step 185 of the bore 182 essentially complementary stepped cylindri's cross-section and is by means of a hollow cylinder extending between this and the closure part 133 186 held in attachment against the first level 185. The wall element 184 has on his the side adjacent to the second piston 172 has a region 187 of substantially diameter tapered to the inner diameter of the hollow cylinder 186 for receiving of the adjacent end of the hollow cylinder 186. The transition to the area 187 is provided in the form of an inclined flank 187a so that a between the flank 187a and the adjacent end of the hollow cylinder 186 arranged sealing element in the form of an O-ring 189 for sealing contact with the end of the hollow cylinder 186, the flank 187a and the adjacent area of the side wall of the hollow-182 bore is brought when it is pressed by the cylinder 186 against the flank 187a. The end face 186 is formed by a protruding in the direction of the second piston 172 Area formed in 188 of the closure part 133, the diameter of which is substantial is also equal to the inner diameter of the hollow cylinder 186 and which is in this extends. Between the Closure part 133 and this adjacent end of the hollow cylinder 186 is another sealing element in the form an O-ring 190 provided, ir the end of the hollow cylinder 186 sealing with the Closure part 193 connects. Advantageously, the O-rings 189, 190 together with the hollow cylinder 186 while at the same time compensating for manufacturing tolerances a holding force of holding the wall element 184 in contact with the first step 185 the closure part 133.

The diameter of the second piston 172 is predetermined by one Amount smaller than the inner diameter of the hollow cylinder accommodating it, see above that between an inner wall of the hollow cylinder 186 and the wall of the second piston 172, an annular throttle gap 142 of predetermined flow cross-section is formed who is the one to the. End faces 173, 174 of the second piston 172 adjoining Areas of the second cylinder chamber 171 connects to one another. In the wall of the flask 172 several radial annular grooves 192 are provided, which shorten the effective Length of the throttle gap 142 without reducing the guide length of the piston t72 enable and at the same time ensure that the pressure one through the Dkosselspalt 142 flowing medium is effective evenly on the circumference of the piston, so that the Piston 172 is not in an eccentric position for rubbing against the wall the cylinder chamber 186 is relocated.

132 The input connection is via an axially through the end wall 176 guided bore with the area of the adjacent to this second Cylinder chamber 171 in connection. The area adjacent to the wall element 184 the second cylinder chamber 171 is via the bore 145 with one to the first End face 156 of the first piston 154 adjoining area of the first 4e cylinder chamber 153 in connection. In one of the first part of the bore 182 and the first stage 185 adjoining area, the wall element 184 has a tapered section 191 Diameter on, but its diameter is larger than that of the first stage 185 subsequent second part of the bore 182 is. Section 191 is limited with the adjacent area of the first portion of the bore 182 and the first step 185 an annular channel 149. The annular channel 149 is via a radial connecting bore 147 in the wall element 184 with its through hole 145 in connection. aside from that is the annular channel 149 via an axially through the first step 185 in the connecting bore 137 extending connecting bore 151 with the bore 137 in communication. The connections 132, 134, 136 have internal threads 193, 194, 195 for screwable connection with (not shown) connecting lines. For releasable connection of the closure part with the housing part are axially arranged centrally (not shown) bores through the closure part 133 in correspondingly arranged threaded holes (not shown) engageable screws 196 are provided. Balls a different fluid is to be used as air, portion 178 of the outlet conduit can of course also with a pressureless collecting area for the Fluid connected will.

To explain the mode of operation of the control device according to the invention 130 it is initially assumed that a flow through the float connections 134, 136 is blocked by the downstream float devices 50, 51. In this In this case, there is no flow of the pressure supplied to the inlet port 132 Air is held by the control device 130, so that the is over the throttle gap 142 propagating pressure on both end faces of the second piston 172 is the same is. The piston 172 is therefore over the sealing element by means of the spring 150 180 brought into contact with the end wall 176, the pressure also pushing the piston 172 acted upon in this position, as the effective area exposed to the pressure of the second end face 174 is then obviously larger than that of the first end face 173. The first end face 156 of the first Piston 154 is acted upon with this pressure, so that the piston 154 against the force the spring 155 is moved so that the sealing element 162 in sealing Plant with the end wall 158 is located.

Via the connecting bore 147, the annular channel 149, the connecting bore 151 and the connecting hole 137 are both the second float connection 136, and the tapered portion 161 is pressurized. However, since the effective Pressure areas of the sealing element 162 are substantially smaller than those of the first end face 156 of the first piston 154, the piston 154 may be in the manner previously described Way against that Pressure in the section 161 can be moved.

Since the bore 139 is thus sealed against the section 161 there is no change in the described conditions when the first float connection 134 is connected to the atmosphere via the upper float device 50. if however, the second float connection 136 via the lower float device 51 is connected to the atmosphere, the second float connector 136 becomes practical pressureless, so that the pressure in the bore 137, the bore 151, the annular channel 149, the hole 147 and the hole 145 drops accordingly. Due to the pressure drop in the bore 145, the spring 155 can now make the piston 154 bear against the To slide wall member 184, with an air flow path from bore 137 via the section 161 through the bore 139, the first float connection 134 and the downstream upper floating device 50 is released. Simultaneously the second piston 172 is effected by means of the throttle gap 142 Pressure difference between its end faces 173, 174 against the force of the spring 150 shifted so far that a state of equilibrium between the action of the Spring 150 and total residual pressure on the second face 174 and one on the first End face 173 acting pressure is achieved, the pressure on the first end face 173 acting pressure through the 42 and throttle point connected upstream of the bing eye connection 132 / the degree of displacement of the second Piston 172 caused Release of the output line 177, 178 is determined.

If now the flow through the with the second float connection 136 connected lower float device 51 is blocked, this has no effect significant change in the switching states described above, as the air continues via the first float connection 134 and the upper float device connected to it 50 can flow off. Only when the upper float device 50 also controls the flow locks, the pressure on the second end face 174 of the second piston can 172 via the throttle point 142, which now becomes flowless, to the pressure at the first end face 173, the second piston 172 by the force the spring 150 via the sealing element 180 in turn to the output line 177, 178 sealing system with the end wall 176 is brought.

At the same time, the first piston 154 is also connected via the bore 145 a pressure sufficient to move it is applied, so that the initially The initial state described is restored.

FIG. 4 according to the invention shows sectional images of a Echwimmer device 50, with the float device 50 on the left when it is raised by a liquid Float element 57 and shown on the right with the float element 57 lowered. The float device 50 has an opening in the cover wall section 15 substantially vertically aligned received chamber part 54 with a sealingly through the opening of the cover wall section 15 in the gas collection chamber 26 extending shaft portion 55. The shaft section 55 carries a centrally arranged and axially through an axial guide hole 58 of the float element 57 extending guide device 56 made of non-magnetizable Material. The stroke of the float 57 is integral with the upward by a Shank portion 55 formed stop 59 and down through one on one limit the lower end of the guide device attached stop, for example from a disc that can be slipped onto a tapered end of the guide device 60 may exist, which can be made by a clamping ring 60a which can be placed on the tapered end is secured. The guide device 56 points into this from the upper end extending axial central blind bore 61 for receiving a cylindrical veaezzliedes 62 made of magnetizable, preferably ferromagnetic material.

The diameter of the valve member 62 is so much smaller than that of the Blind bore 61, which the valve member 62 can be freely slidably received in this can without the risk of jamming. Above the valve member 62 extends a valve body 64 made of magnetizable, preferably ferromagnetic Material sow a blind hole 61 that the valve member 62 between these facing and a valve opening 62 having end of the valve body and the The end of the blind hole is axially displaceable by a distance that is smaller than the Stroke of float 57 is. The part of the extending into the blind bore 61 Valve body 64 has a diameter that increases by a predetermined amount is smaller than the diameter of the blind hole 61.

The float element is an annular groove 72, which extends into the upper side thereof and is arranged coaxially to the guide bore 58, for receiving an annular permanent magnet 69, the axial length of which corresponds approximately to that of the valve member 62. The axial position of a lower end of the annular groove 72 and the lower end of the blind bore 61 are coordinated so that a lower end of the permanent magnet 69 in the lowered position of the float element 57 is at the same height as or slightly lower than a lower end of the valve member 62 is located if that the A Valve member 62 is in its lowered position, in which an edge region of its lower end prevents the valve member 62 from sticking to the lower end of the blind hole with a stuck at the lower end of the blind hole The annular groove and the top of the float element 57 is provided with a cylindrical recess 73 adjoining the guide bore 53 with an undercut 74 for receiving an annular securing member 75 made of deformable material, with which the annular groove 72 can be closed The area adjoining the lower end of the float 57 has a section 71 of enlarged diameter of a length sufficient to completely accommodate a spring 70. The spring 70 which acts on the float element 57 in its raised position is supported on the stop 60 and is designed so that it does full weight of the float element 57 not z u are able to carry. With the aid of a selected biasing force of the spring 70, the liquid level required relative to the float element 57 to raise it can be freely selected, so that the float device 50 can respond to different liquid levels by springs 70 of different biasing force.

The shaft section 55 has an adjacent to its upper end, centrally arranged chamber 76, the lower end of which is integral with a the shaft portion 55 connected, extending radially inward therefrom Annular flange 78 is limited. The annular flange 78 defines an opening through which the guide device extends downward.

The guide device 56 has on its upper one, in the chamber 76 received end one with the annular flange 78 to be brought into abutment, radially after outwardly directed flange portion 79. Ddr valveKqzxr 64 has a radially outwardly extending and section to the plant with an upper end of the flange 79 designed flange with a tapering into the interior of the flange section 79 extending centering attachment 80a, the centering attachment 80a being an automatic Centering of the valve body 64 when it is applied to the guide device 56 causes. As the valve body in contact with the guide device and this in abutment with the annular flange holding member 77 is a with the upper end of the shaft portion 55 connectable cover portion 82 with one of this through the interior of the chamber 76 to the plant with the valve body 64 extending tubular pressure piece 83 is provided. The lid portion has in its upper side eWe like centrally arranged, axially directed connection opening 66, the lower end of which has an axial through hole 66a with the underside of the leakage portion 82 is in communication. The underside of the lid section 82 also has a centrally arranged, projecting centering shoulder 86 which is designed for centering engagement in the upper end of the chamber 76 and a centrally arranged annular groove 84 for receiving one end of the pressure piece 83 has.

The other end of the pressure piece 83 can be received in an annular groove 85, which are arranged in the top of the valve body 64 concentrically to a centered one and axially between the top of the valve body 64 and the valve port 63 extending valve bore 81 is provided. In the annular grooves 84, 85 are between their bottoms and the ends of the pressure piece 83 sealing means in the form of O-rings 92 and 93 vorgeseso hen that the pressure piece 83 is a sealed connection between the through hole 66a and the valve hole 81 creates, the O-rings 92, 93 at the same time the transfer of a holding force while compensating for manufacturing tolerances from the cover section 82 via the pressure piece 83 onto the valve body 64. The upper end of the blind bore 61 projects radially through the flange section 79 guided connection bore 65 with a flange section 79, the flange 80 and the pressure piece 83 annularly surrounding outlet channel 67 in connection. Of the Outlet channel is via one above the Lid wall section arranged Outlet in the form of a radially directed bore 68 through the flange section 55 connected to the atmosphere or a (not shown) pressureless space.

The annular flange 78 has in one of the opening surrounded by it and the region adjoining the flange section 79, an annular recess 90 to accommodate an annular seal (for example an O-ring 91), the one sealing connection between the outside of the puhrungseinrichtung 56 and the annular flange 78 and thus the chamber 76 opposite the gas collection chamber 26 seals gas-tight.

In one at an upper edge of the opening in the top wall section 15, the shaft section 55 has a radially outward direction extending approach 87, which with the upper edge of the opening of the Leckelwandabschnitts 15 can be brought into abutment to a relative axial position of the chamber part 54 opposite to define the leakage wall section.

In one on an inner edge of the opening of the top wall section 15, the shaft section has a radially outer annular groove 88 for receiving an annular seal, for example in the form of an O-ring 89, which has a sealed connection between the top wall section 15 and the shaft portion 55 guaranteed. For Z8-compatible connection of the cover section 82 with the shaft section 55 can be several, through corresponding axial bores (not shown) through the lid portion 82 engaged with correspondingly arranged threaded bores (not shown) in the shaft section 55 extending screws 94 may be provided.

To explain the mode of operation of the float device according to the invention 50 it is initially assumed that the float 57 is in the position shown in FIG the lowered position shown on the right. In this case a the port 66 supplied fluid under pressure through the passage bore 66a, the interior of the pressure piece 83, the valve bore 81, the valve opening 63, through the wall of the blind bore 61 and the diameter of the extending into this Part of the valve body 64 in a predeterminable manner limited flow cross-section, the connecting bore 65, the outlet channel 67 and the outlet 68 in the unpressurized Flow space.

If the liquid level rises slowly and causes a corresponding effect If the float 57 is slowly raised, the above-described conditions change initially nothing, since the strength of the float element 57 in corresponding Way raised permanent magnets 69, the weight of the valve member 62, the magnetic Properties of the material of the valve member 62 and the valve body 64 as well the effective magnetic resistance determined by the shape and spacing of the parts mentioned are so coordinated that the by gravity and the impact flow emerging from the valve opening 63 into the lowered position acted upon valve member 62 is initially not raised. Upon reaching a a predetermined degree of lifting of the permanent magnet 69 becomes the valve member 62 raised by the magnetic forces and very quickly to a valve opening 63 brought sealing abutment with the valve body 64, since the magnetic Field of the permanent magnet partly through the valve body 64 and to another Part runs through the valve member 62, so that between these two parts a magnetic attraction becomes effective, which increases with decreasing distance enlarged.

If the float is lowered again, the process described takes place Actuation process in the opposite direction, the valve member 62 when falling below a minimum required value of the valve member 62 in contact with the valve body 64 holding magnetic holding force suddenly falls back into its lowered position.

Instead of an annular permanent magnet 69 can of course also two or more differently shaped and expediently in or on the float element arranged permanent magnets are used. A valve body 64 can also be made from non-magnetizable material are used. Preferably, however, the described arrangement is used, which is a safe and fast in an advantageous manner Actuation of the valve member between its lowered and raised position and between the raised and lowered position ensures and a tightly closing Closure of the valve opening 63 in the raised position of the valve member 62 is ensured.

Claims (1)

P a t e n t a n s p r ü c h e: Gas meter for separating gases from thin liquids with an inlet and an outlet connection for the liquid flowing through having closed gas separator, the upper space of which through a ventilation device can be vented, a detection device sensing a liquid level in the upper space, which actuates the venting device in accordance with the fluid level, and a shut-off device connected downstream of the outlet connection via a flow measuring device, characterized in that the housing (11) of the gas separator (10) is annular Has inlet chamber (16) which at a lower end with the inlet connection (12) and communicates with a main chamber (18) only along an upper end, whose lower end is in communication with the outlet connection (14), and that the Detection device (40) an upper and a lower float device (50 or 51), the response to fluid levels that are staggered one below the other are designed and arranged, and a control device cooperating with these (130) for the venting device (30), which when actuated in the same direction both float devices (50, 51) an opening or closing the venting device (30) causes. 2. Gasmeßverhüter-according to claim 1, characterized in that the Inlet chamber (16) in one piece from one side wall section (13) and one at the lower end bounded with this connected inner chamber wall section (20) of the housing (11) is. 3. Gas meter according to claim 1 or 2, characterized in that that the inlet connection (12) is oriented and arranged so that the liquid is introduced tangentially into the inlet chamber (16). 4. Gasmeßverhüter according to claim 1-3, characterized in that the inlet chamber (16) with a substantially constant cross-sectional width at least has a steadily increasing ring diameter in an upper region (16a). 5. Gas meter according to one of claims 1 - 5, characterized in that that the housing (11) extends on all sides from above the upper end of the inlet chamber (16) at a distance from it inwards around it and at a distance from the inner chamber wall (20) extending downwards Wall process (22) has that the wall extension (22) has an annular shape with the inner chamber wall (20) Connecting channel (24) limited between the inlet chamber (16) and the main chamber (18) and this from one upwards through part of the venting device (30) and cover wall section (15) of the Housing (11) limited gas collection chamber (26) separates and that a lower edge of the Wall extension (22) is arranged substantially coaxially to the inlet chamber (16) circular opening (25) surrounding a connection between the main chamber (18) and the gas collection chamber (26). 6. Gasmeßverhüter according to claim 5, characterized in that the Wall extension (22) has a funnel-like shape that tapers downwards. 7. Gas meter according to claim 5 or 6, characterized in that that the Eammérwand (20) at its upper end is essentially horizontal over part of the upper end of the inlet chamber (16) towards the side wall has to be extended gas catching flange (17) that an adjacent to the catching flange (17) Area of the chamber wall (20) at least one point over a substantially vertically aligned support member (19) with a Part of the wall process (22) is integrally connected and that in each support member (19) one through the adjacent Wall areas of the chamber wall (20) and the wall extension (22) guided connection channel (21) between the region of the inlet chamber adjoining the gas ring flange (17) (16) and the gas collection chamber (26) is provided. 8. Gasmeßverhüter according to claim 7, characterized in that the Housing (11) is separable and at least one between the lower edge of the wall extension (22) and the inlet connection (12) provided separation surface. 9. Gas meter according to one of claims 1 - 8, characterized in that that the outlet connection (14) is located on a side wall section below the inlet chamber (16) (27) of the housing (11) is provided and via an integrally formed, im Inside the housing (11) with the housing 11) / essentially vertically downwards directed exhaust manifold (28) only with a bottom area of the main chamber (18) in Connection. 10. Gas meter according to one of claims 1 - 9, characterized in that that an input terminal (152) of the control device (130) via a resistance device (42) is connected to an energy supply (100) that the upper float device (50) with a first Float connection (134) and the lower float device (51) connected to a second float connection (136) of the control device (130) is and when responding, depending on the sense of actuation, an energy flow in each case via the associated float connection (134 or 136) and that a control input (32) the Entlüftungsein direction (30) with an energy level at the input port (132) the control device (130) is acted upon and at one by the response both float devices (50, 51) caused one of them to be exceeded or fallen below by means of the biasing force of a valve body (36) acting in the closing direction Valve spring (34) an opening or closing of a predeterminable energy value Vent valve (31) causes. 11. Gasmeßverhüter according to claim 10, characterized in that the Ventilation device (30) one via the control input (32) and one with the Energy supply (100) connected supply connection (35) in parallel with the resistance device (42) switched first threshold value switch (33), which when over or Falling below a predetermined value by means of a pretensioning device (37) Difference between the energy level of the energy supply (100) and that at the control input (32) an actuating device (38) of the vent valve (31) with the power supply (100) connects or disconnects from it. 12. Gas meter according to claim 10 or 11, characterized in that that the control device (130) has a memory element (138) with two switching states has, whose respective switching state is determined by the direction of actuation of the previous one and actuation of both float devices (50, 51) in the same direction is determined and that in one of its switching states an energy flow over a selected one the float (134, 136) connections / locks. 14. Gasmeßverhüter according to claim 12, characterized in that the Control device (130) a second resistance device (142), one end of which via an input line (140) to the input connection (132) and the other End connected to the float connections (134, 136) via a sensing line (141) is, and a second threshold switch (144) that the second threshold switch (144) has two control inputs (146, 148s) and via these in parallel to the second Resistance device (142) is connected and in one by means of a pretensioning device (150) predeterminable difference in energy levels before and after the second Resistance device (142) responds and that the second threshold switch (144) a switching device (152) actuated for the duration of a response, the one Energy outflow of a defined size from the input line - (140) permitted. 14. Gas meter according to one of claims 10-13, characterized in that that a closing in the opposite direction to the actuation of the ventilation device (30) or opening of the shut-off device (120) can be controlled by the control device (130) is. 15. Gasmeßverhüter according to claim 14, characterized in that a Control input (122) of the shut-off device (120) - with the energy level at the input connection (132) of the control device (130) is acted upon and in the event of an over- or under-range one by means of the biasing force of a valve body (126) in the closing direction acting valve spring (124) a predeterminable energy value close or causes opening of a shut-off valve (121). 16. Gasmeßverhüter according to claim 15, characterized in that the. Shut-off device (120) one via the control input (122) and one with the power supply (100) connected supply connection (125) parallel to the resistance device (42) switched third threshold switch (123), which when over or Falling below a mediating. a pretensioning device (127) Difference between the energy level of the energy supply (100) and that at the control input (32) an actuating device (128) of the Abspçrrventils (121) with the energy supply (100) connects or disconnects from it. 19. Gasmeßverhüter according to claim 18, characterized in that the On-off device (102) one by means of a hand button (106) against the Effect of a resetting device (108) which can be switched on first switching device (110) has, which in a switched-on state, the energy source (101) via a first line (105) and a resistance device (107) provided in this with a second line (109) that connects the energy level in the second Line (109) by means of a limiting device (111) connected to it can be limited to an operating value in cooperation with the resistance device (107) is that the second line (109) with an actuator (112) of the first Switching device (110) is connected, which this when applied with the work value to hold against the action of the reset device (108) in the switched-on state capable, and in the case of a supporting the action of the resetting device (108) Switch-off actuation of the hand button (106) or a drop in the energy level below the work value by one due to the design of the reset device (108) predictable amount a return of the first switching device (110) in a Off state allowed, and that the on-off device (102) a second switching device (114) between the output line (104) and and a third line (113, 115) connected to the energy source (101) is switched and an actuator (116) connected to the third conduit (113, 115) and is proportional to the energy level of the Energy source (101) is acted upon in the closing direction, and with the second line (109) is in connection and applied with their energy level in the opening direction will. 20. Gas meter according to one of claims 10-19, characterized in that that the adjustment of the ventilation device (3Q) with the aid of fluid, preferably air, and that also a transmission and processing of the signals of the float devices (50, 51) and conversion into control signals with the aid of Fluid, preferably air, is provided. 21. Gas meter according to one of claims 14-20, characterized in that that the adjustment of the shut-off device (120) with the help of fluid, preferably air. 22. Gas meter according to claim 20 or 21, characterized in that that each of the float devices (50, 51) is stationary and essentially vertical aligned in an associated opening of the cover wall section (15) arranged Chamber part (54) with a through the opening into the interior of the gas collection chamber (26) has extending shaft section (55) that on the shaft section (55) a cylindrical guide device extending axially perpendicularly downwards (56) made of non-magnetizable material for a float element (57) is, the via a guide device '(56) receiving, cylindrical axial Guide bore (58) slidably mounted relative to the chamber part (54) is, such that there is a reciprocating movement between one on the chamber part (54) and one can execute the stop (59 or 60) provided on the guide device (56), that in the guide device (56) an axially extending into this from above cylindrical blind bore (61) for slidably receiving a cylindrical valve member (62) made of magnetizable material and one located above the valve member (62) valve body (64) partially extending into the blind bore (61) is provided, which is raised at its lower end by the valve member (62) in a Position closable valve opening (63) with a connection opening (66) is in V connection, while the blind hole (61) with an unpressurized outlet (68) is in communication, and that the float element (57) is a permanent magnet (69) which carries the valve member (62) in a raised position of the float element (57) in a die Valve opening (63) sealing system against the valve body (64) and in a lowered position of the float element (57) disengaged brings with the valve body (64). 23. Gasmeßverhüter according to claim 22, characterized in that the Valve body (64) consists of magnetizable material. 24. Gas meter according to claim 22 or 23, characterized in that that the float element (57) by gravity against the force of an between this and the stop (607 of the guide device (56) arranged spring (70) can be brought into the lowered position. 25.Gasmeßverhüter according to claim 24, characterized in that the Spring (70) in the lowered position of the floating element (57) completely in a section (71) of the guide bore (58) adjoining its lower end is received, which has an enlarged diameter. 26. Gas meter according to one of claims 22 to 25, characterized in that that the permanent magnet (69) is ring-shaped and in one is coaxial to the guide bore (58) arranged from above into the float element (57) extending annular groove (72) is. 27. Gas meter according to claim 26, characterized in that the float element (57) between an upper end and an upper end of the annular groove (72) an axial cylindrical recess (73) extending beyond that of the annular groove (72) Diameter with an undercut (74) for receiving an annular locking member (75) made of deformable material for the permanent magnet (69). 28. Gas meter according to one of claims 22 to 27, characterized in that that the shaft portion (55) of the chamber part (54) is arranged axially open to the top has cylindrical chamber (76), the lower end of which by a one-piece with the shaft section (55) formed annular flange (78) is defined that the guide device (56) extends sealingly through an axial opening surrounded by the annular flange (78) and at its upper end one which can be brought into supporting contact with the annular flange (78) radial cylindrical flange portion (79) has that the valve body (64) is cylindrical and has a radial flange (80) attached to a lower surface can be brought into supporting contact with an upper end of the flange section (79) is that the valve body (64) has an axial valve bore (81) which Valve opening () connects to an upper side of the valve body (64), and that a holding member (77) which can be connected to the shaft section (55) is provided, which can be brought into engagement with the top of the valve body (64) and thereby a sealing connection between the valve and the holding member f77) bore (81) and the connection opening (66) provided in /. 29. Gasmeßverhüter according to claim 28, characterized in that the Holding member (77) a cover section (82) and a tubular pressure piece (83) has that the connection opening (66) aligned with the valve bore (81) through the cover portion (82) is guided that on one of the valve body (64) facing The underside of the cover section (82) is concentric with the connection opening (66) arranged annular groove (84) for sealingly receiving an upper end of the pressure piece (83) is provided, and that on the top of the valve body (64) a concentric to the valve bore (81) arranged annular groove (85) for the sealing reception of a the lower end of the pressure piece (83) is provided. 30. Gas meter according to claim 29, characterized in that the underside of the cover section (82) is concentric with the connection opening (66) arranged projecting centering lug, the diameter of which in essentially corresponds to that of the chamber (76). 31. Gas meter according to one of claims 22 to 30, characterized in that that the one extending into the blind hole by a predetermined amount (61) Part of the valve body (64) has a / smaller diameter than the blind hole (61) and that an upper end of the guide device (56) has a connecting bore (65) provided between the blind hole (61) and one in the interior of the chamber part (54) Outlet channel (67) which communicates with outlet (68) 32. Gas meter according to claim 31, characterized in that at least one radial outlet is used directed bore (68) through one arranged above the cover wall section (15) Part of the shaft portion (55) is provided. 33. Gas meter according to one of claims 22 to 32, characterized in that that the shaft section (55) has a radially outwardly projecting shoulder (87) has, which from above with an upper edge of the opening of the cover wall section (15) can be brought to the plant. 34. Gas meter according to one of claims 22 to 33, characterized in that that the shaft section is approximately in the middle of an opening with an inner edge Lid wall section (15) engageable area an outer annular groove (88) for receiving an annular seal (89). 35. Gas meter according to one of claims 28 to 34, characterized in that that the annular flange (78) has an annular shape in the region of an upper inner edge Has recess (90) for receiving an annular seal (91). 36. Gas meter according to one of claims 29 to 35, characterized in that that in the the ends of the pressure piece (83) receiving annular grooves (84, 85) are annular Seals (92 or 93) between the respective end of the pressure piece (83) and a Bottom of the respective annular groove (84 or 85) are provided. 37. Gas meter according to one of claims 22 to 36, characterized in that that the upper and the lower float device (50 and 51) through the length a part of the shaft section extending into the gas collecting container (26) (55) differentiate. 38. Gas meter according to one of claims 33 to 37, characterized in that that the upper and the lower float device (50 and 51) through the axial Differentiate the distance between the extension (87) and the upper end of the shaft section (55). 39. Gas meter according to one of claims 24 to 38, characterized in that that the upper and the lower float device (50 and 51) by a biasing force distinguish the spring (70). 40. Gas meter according to one of claims 1 to 39, characterized in that that the lower float device (51) is arranged so that its central axis coincides with that of the housing (11) of the gas separator (10). 41. Gas meter according to one of claims 20 to 40, characterized in that that the storage device (138) is in a housing section (131) of the control device (130) in a first cylinder chamber (153) slidably arranged first Piston (154) has that a first end face (156) of the first piston (154) a pressure in the sensing line (141) can be applied to the first piston (154) to move against the force of a first spring (155) that on a second A first sealing surface (157) is provided on the end face of the first piston (154), when the first piston (154) is actuated with one of the first sealing surfaces (157) opposite end wall (158) of the first cylinder chamber (153) can be brought to bear and in this case one end of an axially directed section (139) a connecting bore t139) to the first float connection (134) sealing closes, and that the first cylinder chamber (153) in one to the end wall (158) adjoining side wall section of a radially directed connecting bore (137) to the second float connection (136), which is also connected to the sensing line (141) is in connection. 42. Gasmeßverhüter according to claim 41, characterized in that the first cylinder chamber (153) a section (161) adjoining the end wall (158) having a tapered diameter, and that the first piston is a differential pressure piston (154) is provided with a correspondingly tapered section (162). 43. Gasmeßverhüter according to claim 42, characterized in that as tapered portion of the first piston (154) with its second end face connected and the first sealing surface (157) having cylindrical sealing element (162) is provided. 44. Gasmeßverhüter according to claim 43, characterized in that the Sealing element (162) by means of an axially centered from the second end face in an axial blind bore of the sealing element (162) extending pin (163) is connected to the second end face. - 45. Gas detector according to claim 43 or 44, characterized in that the sealing element (162) has a radially disposed lip (164) which is in sealing engagement with the Side wall of the tapered portion (162) of the first cylinder chamber (153) is. 46. Gasmeßverhüter according to one of claims 41 to 45, dader through characterized in that / first piston (154) in one adjoining its second end face Area (165) has a tapered diameter and there with an adjacent one Wall of the first cylinder chamber (153) an annular space (166) for receiving forms at least a portion of the first spring (155). 47. Gas meter according to one of claims 41 to 46, characterized in that that the first piston (154) adjoins its first end face (156) in one Area of its side wall has a radial annular groove (167) for receiving one with this and the adjacent wall of the first cylinder chamber (153) in sealing engagement has standing annular sealing element (168). 48. Gas meter according to one of claims 41 to 47, characterized in that that the portion adjoining the portion (161) of tapered diameter of the first Cylinder chamber (153) can be vented via a vent hole (169). 49. Gasmeßverhüter according to claim 48, characterized in that the Vent hole (169) through a filter device (170) with the atmosphere in Connection. 50. Gas meter according to one of claims 20 to 49, characterized in that that the second threshold switch (144) has a housing section (131a) of the control device (130) slidably displaceable in a second cylinder chamber (171) arranged second piston (172) that at least part of a first End face (173) of the second piston (172) with a pressure in the input line (140) can be acted upon that a second end face (174) of the second piston with the force of the pretensioning device (150) and the pressure in the sensing line (141) can be acted upon, and that a part (175) of the switching device (152) is drivingly is connected to the second piston (172). 51. Gasmeßverhüter according to claim 50, characterized in that as with the second piston (172) connected part of the switching device (152) a whose first end face (173) is arranged, projecting second sealing surface (175) is provided, which in a rest position of the second piston (172) at least through the force of the pretensioning device (150) in contact with one of the second sealing surfaces (175) opposite end wall (176) of the second cylinder chamber (171) is held and here one end of an axially directed section (177) sealingly closes an output line (177, 178) of the switching device (152), and that another end of the output conduit (177, 178) is provided with a fluid sump connected is. 52. Gasmeßverhüter according to claim 51, characterized in that the second sealing surface through an end section (175) of a centrally arranged and axially directed first blind hole (179) in the first end face (173) of the second piston (172) tightly received, flexible sealing element (180) is formed. one of the 53rd gas meter according to / claims 50 to 52, thereby characterized in that a second spring (150) is provided as a pretensioning device. 54. Gasmeßverhüter according to claim 53, characterized in that the second spring (150) has a smaller diameter than the second piston (172) and at least for part of its length in one of the second end face (174) of the second piston (172) centrally arranged and axially directed second blind hole (181) can be recorded. 55. Gas meter according to one of claims 50 to 54, characterized in that that the second and first cylinder chambers (171 and 153) are one behind the other in only one stepped bore (182) in a housing part (183) of the control device (130) are arranged that the second and the first cylinder chambers (171 and 153) are delimited from one another by a wall element (184), the means of a to the stepped bore (183) in the vicinity of a radially inwardly directed first stage (185) complementary circumferential shape centered in engagement with this is bringbr, and that the stepped bore (182) through a with the housing part (183) sealingly connectable closure part (133) is closable, with a middle, the area of the closure part (133) adjoining the second cylinder chamber (171) whose end wall (176) forms and an eccentrically arranged axially directed connecting bore (143) to that provided on an opposite side of the closure part (133) Input connection (132), as well as a part of the output line (177, 178) biblende has axial bore (178). 56. Gas meter according to claim 55, characterized in that the Wall element (184) has a centrally arranged and axially directed through hole (16) which connects the first and second cylinder chambers (153 and 171) with each other connects and in a region adjoining the second cylinder chamber (171) Larger diameter to accommodate at least part of the spring (150) having, that one to the first step (185) and a first part of the stepped bore (182) adjacent portion (191) of the wall element (184) has a tapered diameter has and over. a radially directed connecting bore (147) with the through bore (1-45) and that one through the first stage (185), the first Part of the stepped bore (182) and the section (191) of the wall element (184) limited annular channel (149) is in communication with the sensing line (141). 57. Gas meter according to claim 55 or 56, characterized in that that a-sealing between the closure part (133) and the wall element (184) extending hollow cylinder (186) is provided, which the wall element (184) against secures a displacement and forms the side wall of the second cylinder chamber (171). 58. Gas meter according to claim 57, characterized in that the Wall element (184) in an area adjoining the hollow cylinder (186) a diameter substantially reduced to an inner diameter of the hollow cylinder (186) comprises that the closure part (133) has an axially in the direction of the second piston (172) to projecting section (188) of cylindrical cross-section and also substantially the inner diameter of the hollow cylinder (186) corresponding diameter having, and that between a respective end of the hollow cylinder (186) and the Wall element (184) or the closure part (133) has an annular sealing element (189) or 190) is provided. 59. Gas meter according to one of Claims 20 to 58, characterized in that that as a second resistance device one in the housing part (183) of the control device (130) and connecting the input line (140) to the sensing line (141) Throttle point (142) predetermined flow cross-section is provided. 60. Gas meter according to one of claims 56 to 58, dader the second Piston (172) has a diameter which is characterized by daa / r (rn one predetermined amount less than a diameter of the second cylinder chamber (171) is, and that as a resistance device such between a side wall of the second piston (172) and an adjacent portion of a side wall of the second Cylinder chamber (171) formed throttle gap (142) is provided. 61. Gasmeßverhüter according to claim 60, characterized in that the Through hole (145), the radial connecting hole (147) and the annular channel (149) in or on the wall element (184) form parts of the sensing line (141) and over a connecting bore (151) guided axially through the first step (185) with the radial connection bore (137) of the second float connection (136) in connection stand. 62. Gas meter according to claim 60 or 61, characterized in that that a plurality of annular grooves (192) are provided in the side wall of the second piston (172) are. 63. Gas meter according to one of claims 20 to 62, characterized in that that the actuating device (116) of the second switching device (114) according to Art a Differentialdruckkolbeneinriiitung acts and that a smaller effective frontal area a piston (117) with one pressure in the third line (113, 115) and one opposite directed larger effective end face of the piston (117) with a pressure in the second line (109) can be acted upon. L e r s e i t e