CA2032283C - Gas fitting - Google Patents
Gas fittingInfo
- Publication number
- CA2032283C CA2032283C CA002032283A CA2032283A CA2032283C CA 2032283 C CA2032283 C CA 2032283C CA 002032283 A CA002032283 A CA 002032283A CA 2032283 A CA2032283 A CA 2032283A CA 2032283 C CA2032283 C CA 2032283C
- Authority
- CA
- Canada
- Prior art keywords
- gas
- valve
- rod
- proportional magnet
- gas fitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/005—Regulating fuel supply using electrical or electromechanical means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/04—Control of fluid pressure without auxiliary power
- G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
- G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
- G05D16/0644—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator
- G05D16/0655—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using one spring-loaded membrane
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2086—Control of fluid pressure characterised by the use of electric means without direct action of electric energy on the controlling means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F23N2235/16—Fuel valves variable flow or proportional valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F23N2235/24—Valve details
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
- Portable Nailing Machines And Staplers (AREA)
Abstract
Abstract In the case of a gas fitting, in particular for gas-firing systems, comprising a housing containing two chambers which are connected via an inlet and/or outlet and which are separated one from the other by a wall provided with a valve face, and comprising further a rod extending in perpendicular direction relative to the wall, which rod can be displaced in longitudinal direction by means of a drive and is equipped with a valve disk coacting with the valve face, the gas fitting being further equipped with a gas-pressure regulator acting upon the rod, the outlet pressure can be controlled in a simple manner if the said rod is connected to the armature of a proportional magnet which counteracts the force of the said drive.
Description
-Z03Z~:~33 Gas Fittina Field o$ the Invention The present invention relates to a gas fitting, in particular for gas-firing systems, comprising a valve with a housing containing two chambers which are connected via an inlet and/or outlet and which are separated one from the other by a wall provided with a valve $ace, and comprising further a rod extending in perpendicular direction relative to the wall, which rod can be displaced in longitudinal directlon by means of a drive and is equipped with a valve di~k coacting with the valve face, the gas fitting being further equipped with a gas-pressure regulator acting upon the rod.
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203~lE; .3 Backaround of the Invention Fittings of the design described above have been known in many forms. DE-OS 31 46 591 describes a gas fitting of this type where the yas pressure is controlled by means of a gas-pressure regulator using a diaphragm. In the case of this gas fitting, the pressure at the outlet of the fitting can be adjusted by means of an adjusting screw at the valve drive. The adjusting screw of the drive serves, for example, for setting the gas fitting to a specific burner efficiency.
In order to vary the burner efficiency, or to provide a burner with variable efficiency, the output pressure of the gas fitting must be variable. This can be achieved by equipping the gas fitting with an additional valve with infinitely variable valve cross-section. There have been known coupled ga~ and air controls where in the event the air supply volume changes, the gas volume is adjusted in accordance with that change. The actuating forces are produced in this case by diaphragms which adjust the valve cross-section in response to the pressures. Systems of this type constitute coupled air and gas controls.
Now, it is the object of the present invention to have the outlet pressure of the gas fitting controlled by an electric signal.
Summarv of the Invention Thi~ object is achieved according to the invention by an arran~ement in which the rod is connected to the armature of a proportional magnet which counteracts the force of the drive.
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In the case of the gas fitting according to the invention it is now possible, with the aid of the proportional magnet, to control the outlet pressure in a simple way, without the use of an additional valve. Given the fact that the proportional magnet is connected to the rod actuating the valve of the gas fitting via its armature, it is now possible to influence the valve cross-section directly by displacing the rod. In the dead condition of the proportional magnet, the gas fitting and/or its valve remains uninfluenced so that the valve, when opened, will present its maximum valve cross-section that has been adjusted by the drive, with the pressure prevailing at the outlet of the gas fitting being the pre-adjusted outlet pressure. Now, if the pressure is to be lowered, the proportional magnet is excited by a given current which will cause the armature to be retracted into the magnet at a given force. This force counteracts the actuating force of the drive, thereby reducing the opening cross-section of the valve. As a result, the outlet pressure will drop simultaneously. It is thus possible to vary the opening cross-section and, consequently, the outlet pressure via the current intensity of the proportional magnet. A low outlet pressure may be required, for example, if a low burner efficiency i~ desired. Consequently, the control signal for the proportional magnet may consist of the output signal of an electric temperature sensor or controller by which the proportional magne~ is activated directly.
According to another possibility, the control signal may consist of the output signal of an electric pressure sensor picking up, for example, the air pressure prevailing at any t~me ~o that the outlet pressure is related to the air pressure. It i5 thus possible, with the aid of the proportional magnet, to drive the gas fitting by an electric value in such a way that lts outlet pressure and, consequently, the thermal ef~iciency of a burner, can be controlled elastically and in a simple manner.
' ': , 2032~
The gas fitting according to the invention provides, for example, the possibility to start a burner up in several stages, with any desired time delay. By driving the proportional magnet in a purposeful manner, the starting curve can be given any desired configuration. This makes it possible for specially designed gas fittings to do without such commonly used components as by-pass valves, two-stage valves and hydraulic brakes, to achieve delayed opening. The inventive design of the gas fitting, therefore, also allows modulating operation, that is operation with an atmospheric burner. In combination with a corresponding electronic control circuit, a 0~ control, a coupled gas and air control, temperature control or the like can be implemented in a simple way with the aid of the gas fitting according to the invention. In addition, the invention provides certain safety aspects insofar as the gas fitting will continue to operate in the conventional manner in the event the proportional magnet should fail.
According to a particularly advantageous embodiment of the invention, the proportional magnet is designed in such a way that as long as the current remains constant, a constant force is exerted upon the armature which is arranged in the coil for movement in the longitudinal direction. This design ensures that a constant actuating force acts on the valve rod regardle~s of the position of the valve, i.e. whether the drive of the valve is ~et to a high outlet pressure or a low outlet pre~sure, and irrespective of the force of the gas-pressure regulator. Consequently, the proportional magnet exerts an equal controlling force on the valve rod, even if the valve position should change due to the action o~ the gas-pressure controller. And this applies even if the drive should be adjusted later in the sense of increasing or , - ' ': .
20~;~2~:~
lowering the outlet pressure. This does away advantageously with the need for recalibrating the proportional valve, or its actuating force which is a function of the excitation current.
According to a particularly preferred embodiment of the invention, the proportional magnet presents a linear relationship between the excitation current and the actuating force. This provides the advantage that the output signal of a measuring sensor, for example, such as a temperature or pressure sensor, can be used as excitation signal, i.e. as excitation current for the proportional magnet, directly, i.e. without the provision of an intermediary measuring transducer. The proportional magnet thus reacts directly to any variation of the output signal of an electric measuring instrument.
A particular advantage is achieved when the proportional magnet acts in the closing direction of the valve. This is regarded as an additional safety feature as in the event an overvoltage should be applied to the magnet by error, the force of the proportional magnet will have a closing effect which means that the valve of the gas fitting will be closed and the burner supply will be interrupted.
According to a preferred embodiment of the invention, the actuating force of the proportional magnet at maximum excitation current is at least equal to the actuating force of the drive. This provides the poRsibility to have the proportional magnet control the flow cross-section of the valve down to zero, which means that the valve can be completely blocked.
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In order to minimize the bearing friction, the proportional magnet can be controlled advantageously by a dither signal.
In the case of this type of signal control, a frequency is superimposed upon the working or control current so that the armature will move continuously at a small amplitude, i.e.
oscillate at a small amplitude, thereby eliminating the static friction influences.
According to a further improvement, the proportional magnet acts upon the rod of the valve via a vibration damper. The vibration damper, which may be designed for example as a spring with suitable stiffness, provides the advantage of dampening the oscillating movement of the proportional magnet in a manner such that the valve itself remains almost completely uninfluenced by the oscillating movement. On the other hand, any positional change of the armature in the magnet will be transmitted unchanged.
According to a preferred embodiment of the invention, the actuating force of the proportional magnet is infinitely variable. This opens up the possibility to set the valve, in any po~sible way, to any intermediary position between its fully open and its fully closed positions.
In order to increase the versatility of the proportional magnet, the invention provides that the proportional magnet be de~igned as flange-mounting retrofit assembly. This allows to equip exieting fittings with such a proportional magnet with a minimum o~ modifications.
The gas ~ittin~ according to the invention i8 transferred to it~ open or closed positions by means of a solenoid valve, the open position being assumed when the coil of the solenoid .
20322~:~
valve is passed by an excitation current. Any interruption of that current will cause the solenoid valve to be released and the gas fitting, i.e. the valve of the fitting, to assume its closed position. Consequently, only the excitation current for the solenoid valve is required for opening or closing the fitting.
The gas fitting according to the invention is further equipped with a gas pressure regulator which acts to balance out any fluctuations of the input pressure Pe relative to the atmospheric pressure. This leads to the advantageous situation that the outlet pressure Pa always remains at a constant value.
Moreover, the rod that tends to lift the valve disk off the valve face i8 connected to the armature of an additional magnet which in the excited condition urges the rod and, thus, the valve disk, toward the closed position, against the force which tends to keep it in the open position. Due to the direct connection between the rod and the armature of ~the proportional magnet, direct power transmission from the magnet to the valve disk is achieved so that the valve will respond to any variations of the proportional magnet without any time delay.
Brief DescriDtion of the Drawinas Other features, advantages and details of the invention will become apparent from the following specification describing a particularly preferred embodiment of the invention with re~erence to the drawing in which:
... . . . ..
203;~2~
ig. 1 shows a longitudinal section through a gas fitting, with flange-mounted proportional magnet;
and ig. 2 shows a function chart of the gas fitting illustrating the operation of the proportional magnet.
Detailed DescriDtion of the Drawinas The gas fittin~ illustrated in fig. 1 comprises a central housing part 1 having substantially four chambers, namely an inlet chamber 2 adjacent the left outer panel, as viewed in the drawing, an outlet chamber 3 adjacent the right outer panel, as viewed in the drawing, and two central, upper and lower, chambers 4 and 5 defining an upper and a lower housing portion, respectively. The inlet and outlet chambers 2 and 3 are separated from the upper chamber 4 and the lower chamber 5 by horizontal walls 6 and 7, or 8 and 9 respectively, and are separated one from the other by a transverse wall 10. A transverse channel 11 provided in the tran~verse wall 10 connects the two central chambers 4 and 5.
Each of the horizontal walls 6 and 7, that separate the inlet chamber 2 from the two central chambers 4 and 5, comprises a valve face 12, 13, respectively. The lower valve face 13, as viewed in fig. 1, ha~ a plane contact surface acting as seat for the cutter-shaped ed~e 15 of the valve d~k 14. The cutter-shaped edge 15 is disposed on a plate 16 consi~ting of an elastic material, such as rubber or the like, fixed to the bottom of the valve disk 14. The valve di~k 14 has the same diameter a~ the upper valve face 12 ..
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which in its turn is equipped with a cutter-shaped edge 12 coacting with a plane contact surface of the upper valve disk 18, as viewed in fig. 1, the said contact surface being disposed on the bottom of a plate 19 provided on the valve disk 18 and consisting likewise of an elastic material. Both valves disks 14 and 18 are fixed rigidly on a rod 20 that extends perpendicularly to the plane of the valve faces 12 and 13 and the valve disks 14 and 18, in a manner such that both valve disks 14 and 18 are simultaneously in sealing contact with the valve faces 13 and 12. The rod 20 is passed through the two valve faces 12 and 13, and its one end is connected to a diaphragm 21 of a gas-pressure regulator 24.
In addition, the closing element formed by the rod 20 and the two valve disks 14 and 18 is subjected to the action of an armature 22 of a solenoid valve 25.
As can be seen best in fig. 1, the arrangement of the illustrated embodiment is such that the diaphragm 21 of the gas-pre~sure regulator 24 is located in a lower housing part 31 which i5 fixed to the bottom of the central housing part 1 and which comprises a cavity divided by the diaphragm 21 into two chambers 32 and 33. The upper chamber 33 is separated from the lower, central chamber 5 of the central housing part 1 by a partition 34 arranged in sealing relationship between the two housing parts 1 and 31. The partitlon 34 i8 equipped with a bearing 35 in which the rod 20 is guided for axial displacement. In addition, one can see an opening 36 interconnecting the two central chambers 4 and 5, and the transver~e channel 11 with the chambers 33 of the gas-pressure regulator 24. This guarantees that the pres~ure prevailing in the chamber 33 of the gas-pressure regulator 24 i9 characteristic of the mean pressure in the chamber~ 4 and 5 which are interconnected by the said transver~e channel 11.
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203~2f;~.3 It will be readily understood that the gas pressure acting on the diaphragm 21 tends to move the diaphragm 21, with the rod 20, in downward direction and, consequently, to apply the valve disks 14 and 18 against their valve faces 13 and 12, i.e. to close the passage from the chamber 2 to the chambers 4 and 5. The gas pressure is counteracted by a control spring 37 which is designed as helical tension spring and which acts upon the end of the rod 20 opposite the diaphragm 21. The control spring 37 carries on its one end a connecting element 38 which is fixed on the end face of the rod 20, as can be seen best in fig. 1. The other end of the control spring 37 is equipped with a sliding element 40 carrying a projection 41 of the hexagonal cross-section which is guided in a tube 42 of corresponding inner cross-section, thereby being fixed against rotation. The tube 42 extends coaxially to the rod 20, and to the control spring 37 extending from the latter, and comprises an actuating spindle 43, the latter being mounted at the end of the tube 42 facing away from the control spring 37 in rotating, but axially fixed relationship. The actuating spindle 43 engages an inner thread of the sliding element 40 90 that the sliding element 40 can be displaced in the longitudinal direction 42 by turning the actuating spindle 43. It is thus possible to vary the tension of the control spring 37 within broad limits and to pre-set the nominal lower threshold pressure below which the valve disks 14 and 18 o~ the gas fitting will be lifted off their valve faces 12 and 13.
A~ has been mentioned before, the gas fitting is equipped, in the case of the illustrated embodiment of the invention, with a first solenoid valve 25 whose armature 22 extends coaxially to the rod 20 and to the control spring 27 and which is equipped with a central bore accommodating these ... . ..... . .. ... . . .
2032~
latter components. The lower end of the armature 22 is surrounded by a helical pressure spring 52 whose lower end is supported on a shoulder of the armature 22 which, in the case of the illustrated embodiment, is formed by a snap ring 53 fitted in an annular groove of the armature 22. The upper end of the helical pressure spring 53 is supported on the lower end face of a magnetic flux sleeve 54 of the solenoid 25. In the non-excited condition of the solenoid 25, the armature 22 bears against the upper surface of the upper valve disk 18 under the action of the helical pressure spring 52, thus keeping the gas fitting closed. If, however, the solenoid is excited, by feeding current to the coil 55 surrounding the magnetic flux sleeve 54, then the armature 22 is lifted off the valve disk 18, whereby the valve is released and will open or close to a greater or lesser degree, under the action of the control spring 37, depending on the gas pressure prevailing at that time.
Similar to the horizontal walls 6 and 7, the horizontal walls 8 and 9 of the central housing part 1 are likewise provided with valve faces 61 and 62 which coact with valve disks 63 and 64 mounted rigidly on the rod 65. The design of the valve faces 61 and 62, and of the valve disks 63 and 64, as well as their arrangement on the rod 65 is completely identical to the arrangement of the gas fitting described before so that a repeated description can be dispensed with.
There is only one difference insofar as the rod 65 is not connected to the diaphragm of a gas-pressure regulator, but is connected exclusively to an armature 66 of another solenoid valve 67. The armature 66 and the rod 65 are connected in form-locking engagement so that when the armature 66 picks up a~ the coil 68 is excited, the valve disks 63 and 64 will be forcedly lifted off their valve ~aces 61 and 62. In the non-excited condition of the 2032~
solenoid valve 67, the valve disks 63 and 64 are retained in their closed positions by a helical pressure spring 69 which is arranged to surround the armature 66 and which in its turn is supported by the lower end of a magnetic flux sleeve 70 and, at its other end, on the upper face of the valve disk 63.
Similar to the way in which the lower central chamber 5 of the central housing part 1 is closed by the partition 34, the upper central chamber 4 of the central housing part 1 is closed a ferromagnetic plate 71 being part of the magnet arrangements of the two solenoid valves 25 and 67. The ferromagnetic plate 71 accommodates the magnetic flux sleeves 54 and 70 of the two solenoid valves, which are screwed into the plate and which are surrounded by the coils 55 and 68. The upper ends of the magnetic flux sleeves 5~
and 70 projecting from the coils 55 and 68 are interconnected by another ferromagnetic plate 72. The arrangement is such that the two magnetic flux sleeves 54 and 70 are connected in series with respect to the magnetic flux.
If, in the illustrated arrangement, the two magnet valves are excited and are, thus, in their open po~itions, or released for assuming their open positions, a gas flow is allowed to pass from the inlet chamber 2 through a filter 23 arranged therein and then, in the form of two parallel flows, through the open valve face~ 12 and 13 and into the central chambers 4 and 5, After having passed the valve faces 61 and 62, the flows are then united again in the outlet chamber 3 from where they can be supplied to a consumer connected to the central housing part 1. The gas flow can be lnterrupted by closing one of the two valves. It will be readily appreciated that in the clo~ed condition of the ~as ~ittin~, the gas pressure in the chamber 2 will act :, ' , ' :
.: ~ ' ~ '' ;
;~()3Z~
upon the upper valve disk 18 in the opening direction, and upon the lower valve disk 14 in the closing direction so that the forces exerted upon these two valve disks by the gas pressure will balance out each other. It is important in this connection that the active surfaces of the two valve sections defined by the cutter-shaped edges on the valve disk 14 and the valve seat 12 must be equai. The valve, and in particular the gas-pressure regulator 24, operate absolutely independently of the pressure of the uncontrolled gas flow. The same applies by analogy to the valve arranged downstream of the valve where the gas loading the valve disk 43 in the upper chamber 4 acts in the closing direction, whereas the gas in the lower chamber 4 acts on the valve face 64 in the opening sense The forces acting on the valve disks 63 and 64, therefore, balance out each other here, too. Consequently, no important pressures are required either to keep this second valve closed, or to open it against the prevailing gas pressure.
Simple regulation of the outlet pressure is achieved by means of a proportional magnet 26. To this effect, another housing 27 is mounted, for example flange-mounted by means of screws 28, at the bottom of the lower housing part 31.
The housing 27 accommodates the magnet coil 29 of the proportional magnet 26. The ring-shaped magnet coil 29 comprises a central opening accommodating a magnetic flux ~leeve 30 and an armature 39. The axes of the magnet coil 29, the magnetic flux sleeve 30 and the armature 39 extend coaxially to the axis of the rod 20. ~elow the diaphragm 21, the rod 20 i~ equipped with an extension 44 which extends axially through the armature 39 and which is fastened on the armature 39, for example by means of a setscrew 45. The extension 44 and the rod 20 may be formed as a single piece, .... .. . . . ...
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although the extension 44 may also be screwed into the end of the rod 20, via a thread, directly below the diaphragm 21, or be connected to the lower end of the rod 20, for example via a spring (not shown in the drawing).
Now, when the proportional magnet 26 is excited, as the magnet coil 29 is supplied with an excitation current, the armature 39 is pulled toward the lower end of the housing 27, as viewed in fig. 1. This has the consequence that the opening cross-section of the valves constituted by the two valve disks 14 and 18 and the two valve faces 13 and 20 is reduced. The actuating force of the proportional magnet 26, therefore, counteracts the force of the control spring 37 so that the valve cross-section is reduced when the actuating force in increased. It is thus possible to control the flow cross-section of the valve by the proportional magnet 26.
Considering that the actuating force of the proportional magnet 26 is independent of the position of the armature 39 in the ma~net coil 29, any change of the actuating force will always lead to the same variation of the flow cross-section of the valve, regardless of the importance of the force of the control spring 37, i.e. regardless of the particular setting of the adjusting spindle 43.
Fig. 2 shows a dia~ram illustrating the basic principle of the gas fitting, where the tension spring 37 acts upon the upper end of the rod 20 at a force F~, while the extension 44, with the armature 39 mounted thereon, i8 fixed at the lower end of the rod 20. The armature 39 is guided for vertical displacement in the magnet coil 29 of the proportional magnet which i9 indicated generally by 26. In addition, the lower end of the rod 20 i9 coupled with the diaphragm 21 whose upper surface is subjected to the action of the outlet pressure Pn, while its lower surface i8 ;
. . . :: . .
. . ~ . , ~ .
:; . . . .
203~21~.~
subjected to the action of the surrounding air pressure, so that the resultant force FP acts upon the rod 20. When a current flows through the magnet coil 29 of the proportional magnet 26, then the proportional magnet 26 exerts upon the rod 20 a force FM opposite to the force of the control spring 37. In the stabilized condition, there ~ n equilibrium of forces, the force FF of the control spring 37 being equal to the sum of the forces of the diaphragm 21 and the proportional magnet 26. Therefore, the following relationship applies:
FF = FP + FM.
From this it appears that a higher current flowing through the magnet coil 29 gives rise to a higher actuating force FM
of the proportional magnet 26, with the result that the rod 20 is lowered until the force FF of the control spring 37 has risen to an amount where the equilibrium of forces is restored. The downward movement of the rod 20 leads to a reduction of the valve cross-section and, consequently, to a lower outlet pressure Pa . When the current flowing through the magnet coil 29 rises, then the flow cross-section of the valve increases so that the outlet pressure P~ increases, too. Due to the gas-pressure regulator, this process is independent of the magnitude of the inlet pressure P~, any variations of the inner pressure P~ being balanced out already by the gas-pressure regulator 24. It will be readily understood that it is thus possible in a simple way to control the flow cross-section of the valve and, as a function thereof, the outlet pressure Pu of the gas fitting, and, accordingly, the burner efficiency by the current flowing through the magnet coil 29.
.
. . .
, ~ . . .
~ 16 -Z032Z~3 If the force FM of the proportional magnet 26 is increased by the amount F, with the force FF of the control spring 27 remaining constant, then the force Fp of the gas-pressure regulator 24, i.e. the force FP acting upon the diaphragm 21, must decrease by exactly that amount F in order to meet the conditions of the before-described equation. Given the fact, however, that the surface of the diaphragm 21 remains constant, the force FP can be lowered by the amount F only by lowering the outlet pressure Pa.
It is understood that the invention is not limited to the illustrated embodiment, but that certain deviations are imaginable including, for example, an arrangement doing without the second valve, or using valves having only a single valve disk.
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.~ .
~, ~ , ...... .
. . .
~ . . . . .. ... . . .. . .
.... . . ~': ' , ', ' . ' : ' :;, ' ':' ' ' , ?,, j~ ??. ,~ ~ ' ' ' . . ~
. ~
203~lE; .3 Backaround of the Invention Fittings of the design described above have been known in many forms. DE-OS 31 46 591 describes a gas fitting of this type where the yas pressure is controlled by means of a gas-pressure regulator using a diaphragm. In the case of this gas fitting, the pressure at the outlet of the fitting can be adjusted by means of an adjusting screw at the valve drive. The adjusting screw of the drive serves, for example, for setting the gas fitting to a specific burner efficiency.
In order to vary the burner efficiency, or to provide a burner with variable efficiency, the output pressure of the gas fitting must be variable. This can be achieved by equipping the gas fitting with an additional valve with infinitely variable valve cross-section. There have been known coupled ga~ and air controls where in the event the air supply volume changes, the gas volume is adjusted in accordance with that change. The actuating forces are produced in this case by diaphragms which adjust the valve cross-section in response to the pressures. Systems of this type constitute coupled air and gas controls.
Now, it is the object of the present invention to have the outlet pressure of the gas fitting controlled by an electric signal.
Summarv of the Invention Thi~ object is achieved according to the invention by an arran~ement in which the rod is connected to the armature of a proportional magnet which counteracts the force of the drive.
203~
In the case of the gas fitting according to the invention it is now possible, with the aid of the proportional magnet, to control the outlet pressure in a simple way, without the use of an additional valve. Given the fact that the proportional magnet is connected to the rod actuating the valve of the gas fitting via its armature, it is now possible to influence the valve cross-section directly by displacing the rod. In the dead condition of the proportional magnet, the gas fitting and/or its valve remains uninfluenced so that the valve, when opened, will present its maximum valve cross-section that has been adjusted by the drive, with the pressure prevailing at the outlet of the gas fitting being the pre-adjusted outlet pressure. Now, if the pressure is to be lowered, the proportional magnet is excited by a given current which will cause the armature to be retracted into the magnet at a given force. This force counteracts the actuating force of the drive, thereby reducing the opening cross-section of the valve. As a result, the outlet pressure will drop simultaneously. It is thus possible to vary the opening cross-section and, consequently, the outlet pressure via the current intensity of the proportional magnet. A low outlet pressure may be required, for example, if a low burner efficiency i~ desired. Consequently, the control signal for the proportional magnet may consist of the output signal of an electric temperature sensor or controller by which the proportional magne~ is activated directly.
According to another possibility, the control signal may consist of the output signal of an electric pressure sensor picking up, for example, the air pressure prevailing at any t~me ~o that the outlet pressure is related to the air pressure. It i5 thus possible, with the aid of the proportional magnet, to drive the gas fitting by an electric value in such a way that lts outlet pressure and, consequently, the thermal ef~iciency of a burner, can be controlled elastically and in a simple manner.
' ': , 2032~
The gas fitting according to the invention provides, for example, the possibility to start a burner up in several stages, with any desired time delay. By driving the proportional magnet in a purposeful manner, the starting curve can be given any desired configuration. This makes it possible for specially designed gas fittings to do without such commonly used components as by-pass valves, two-stage valves and hydraulic brakes, to achieve delayed opening. The inventive design of the gas fitting, therefore, also allows modulating operation, that is operation with an atmospheric burner. In combination with a corresponding electronic control circuit, a 0~ control, a coupled gas and air control, temperature control or the like can be implemented in a simple way with the aid of the gas fitting according to the invention. In addition, the invention provides certain safety aspects insofar as the gas fitting will continue to operate in the conventional manner in the event the proportional magnet should fail.
According to a particularly advantageous embodiment of the invention, the proportional magnet is designed in such a way that as long as the current remains constant, a constant force is exerted upon the armature which is arranged in the coil for movement in the longitudinal direction. This design ensures that a constant actuating force acts on the valve rod regardle~s of the position of the valve, i.e. whether the drive of the valve is ~et to a high outlet pressure or a low outlet pre~sure, and irrespective of the force of the gas-pressure regulator. Consequently, the proportional magnet exerts an equal controlling force on the valve rod, even if the valve position should change due to the action o~ the gas-pressure controller. And this applies even if the drive should be adjusted later in the sense of increasing or , - ' ': .
20~;~2~:~
lowering the outlet pressure. This does away advantageously with the need for recalibrating the proportional valve, or its actuating force which is a function of the excitation current.
According to a particularly preferred embodiment of the invention, the proportional magnet presents a linear relationship between the excitation current and the actuating force. This provides the advantage that the output signal of a measuring sensor, for example, such as a temperature or pressure sensor, can be used as excitation signal, i.e. as excitation current for the proportional magnet, directly, i.e. without the provision of an intermediary measuring transducer. The proportional magnet thus reacts directly to any variation of the output signal of an electric measuring instrument.
A particular advantage is achieved when the proportional magnet acts in the closing direction of the valve. This is regarded as an additional safety feature as in the event an overvoltage should be applied to the magnet by error, the force of the proportional magnet will have a closing effect which means that the valve of the gas fitting will be closed and the burner supply will be interrupted.
According to a preferred embodiment of the invention, the actuating force of the proportional magnet at maximum excitation current is at least equal to the actuating force of the drive. This provides the poRsibility to have the proportional magnet control the flow cross-section of the valve down to zero, which means that the valve can be completely blocked.
. .
20322~,~
In order to minimize the bearing friction, the proportional magnet can be controlled advantageously by a dither signal.
In the case of this type of signal control, a frequency is superimposed upon the working or control current so that the armature will move continuously at a small amplitude, i.e.
oscillate at a small amplitude, thereby eliminating the static friction influences.
According to a further improvement, the proportional magnet acts upon the rod of the valve via a vibration damper. The vibration damper, which may be designed for example as a spring with suitable stiffness, provides the advantage of dampening the oscillating movement of the proportional magnet in a manner such that the valve itself remains almost completely uninfluenced by the oscillating movement. On the other hand, any positional change of the armature in the magnet will be transmitted unchanged.
According to a preferred embodiment of the invention, the actuating force of the proportional magnet is infinitely variable. This opens up the possibility to set the valve, in any po~sible way, to any intermediary position between its fully open and its fully closed positions.
In order to increase the versatility of the proportional magnet, the invention provides that the proportional magnet be de~igned as flange-mounting retrofit assembly. This allows to equip exieting fittings with such a proportional magnet with a minimum o~ modifications.
The gas ~ittin~ according to the invention i8 transferred to it~ open or closed positions by means of a solenoid valve, the open position being assumed when the coil of the solenoid .
20322~:~
valve is passed by an excitation current. Any interruption of that current will cause the solenoid valve to be released and the gas fitting, i.e. the valve of the fitting, to assume its closed position. Consequently, only the excitation current for the solenoid valve is required for opening or closing the fitting.
The gas fitting according to the invention is further equipped with a gas pressure regulator which acts to balance out any fluctuations of the input pressure Pe relative to the atmospheric pressure. This leads to the advantageous situation that the outlet pressure Pa always remains at a constant value.
Moreover, the rod that tends to lift the valve disk off the valve face i8 connected to the armature of an additional magnet which in the excited condition urges the rod and, thus, the valve disk, toward the closed position, against the force which tends to keep it in the open position. Due to the direct connection between the rod and the armature of ~the proportional magnet, direct power transmission from the magnet to the valve disk is achieved so that the valve will respond to any variations of the proportional magnet without any time delay.
Brief DescriDtion of the Drawinas Other features, advantages and details of the invention will become apparent from the following specification describing a particularly preferred embodiment of the invention with re~erence to the drawing in which:
... . . . ..
203;~2~
ig. 1 shows a longitudinal section through a gas fitting, with flange-mounted proportional magnet;
and ig. 2 shows a function chart of the gas fitting illustrating the operation of the proportional magnet.
Detailed DescriDtion of the Drawinas The gas fittin~ illustrated in fig. 1 comprises a central housing part 1 having substantially four chambers, namely an inlet chamber 2 adjacent the left outer panel, as viewed in the drawing, an outlet chamber 3 adjacent the right outer panel, as viewed in the drawing, and two central, upper and lower, chambers 4 and 5 defining an upper and a lower housing portion, respectively. The inlet and outlet chambers 2 and 3 are separated from the upper chamber 4 and the lower chamber 5 by horizontal walls 6 and 7, or 8 and 9 respectively, and are separated one from the other by a transverse wall 10. A transverse channel 11 provided in the tran~verse wall 10 connects the two central chambers 4 and 5.
Each of the horizontal walls 6 and 7, that separate the inlet chamber 2 from the two central chambers 4 and 5, comprises a valve face 12, 13, respectively. The lower valve face 13, as viewed in fig. 1, ha~ a plane contact surface acting as seat for the cutter-shaped ed~e 15 of the valve d~k 14. The cutter-shaped edge 15 is disposed on a plate 16 consi~ting of an elastic material, such as rubber or the like, fixed to the bottom of the valve disk 14. The valve di~k 14 has the same diameter a~ the upper valve face 12 ..
Z032~
which in its turn is equipped with a cutter-shaped edge 12 coacting with a plane contact surface of the upper valve disk 18, as viewed in fig. 1, the said contact surface being disposed on the bottom of a plate 19 provided on the valve disk 18 and consisting likewise of an elastic material. Both valves disks 14 and 18 are fixed rigidly on a rod 20 that extends perpendicularly to the plane of the valve faces 12 and 13 and the valve disks 14 and 18, in a manner such that both valve disks 14 and 18 are simultaneously in sealing contact with the valve faces 13 and 12. The rod 20 is passed through the two valve faces 12 and 13, and its one end is connected to a diaphragm 21 of a gas-pressure regulator 24.
In addition, the closing element formed by the rod 20 and the two valve disks 14 and 18 is subjected to the action of an armature 22 of a solenoid valve 25.
As can be seen best in fig. 1, the arrangement of the illustrated embodiment is such that the diaphragm 21 of the gas-pre~sure regulator 24 is located in a lower housing part 31 which i5 fixed to the bottom of the central housing part 1 and which comprises a cavity divided by the diaphragm 21 into two chambers 32 and 33. The upper chamber 33 is separated from the lower, central chamber 5 of the central housing part 1 by a partition 34 arranged in sealing relationship between the two housing parts 1 and 31. The partitlon 34 i8 equipped with a bearing 35 in which the rod 20 is guided for axial displacement. In addition, one can see an opening 36 interconnecting the two central chambers 4 and 5, and the transver~e channel 11 with the chambers 33 of the gas-pressure regulator 24. This guarantees that the pres~ure prevailing in the chamber 33 of the gas-pressure regulator 24 i9 characteristic of the mean pressure in the chamber~ 4 and 5 which are interconnected by the said transver~e channel 11.
!
203~2f;~.3 It will be readily understood that the gas pressure acting on the diaphragm 21 tends to move the diaphragm 21, with the rod 20, in downward direction and, consequently, to apply the valve disks 14 and 18 against their valve faces 13 and 12, i.e. to close the passage from the chamber 2 to the chambers 4 and 5. The gas pressure is counteracted by a control spring 37 which is designed as helical tension spring and which acts upon the end of the rod 20 opposite the diaphragm 21. The control spring 37 carries on its one end a connecting element 38 which is fixed on the end face of the rod 20, as can be seen best in fig. 1. The other end of the control spring 37 is equipped with a sliding element 40 carrying a projection 41 of the hexagonal cross-section which is guided in a tube 42 of corresponding inner cross-section, thereby being fixed against rotation. The tube 42 extends coaxially to the rod 20, and to the control spring 37 extending from the latter, and comprises an actuating spindle 43, the latter being mounted at the end of the tube 42 facing away from the control spring 37 in rotating, but axially fixed relationship. The actuating spindle 43 engages an inner thread of the sliding element 40 90 that the sliding element 40 can be displaced in the longitudinal direction 42 by turning the actuating spindle 43. It is thus possible to vary the tension of the control spring 37 within broad limits and to pre-set the nominal lower threshold pressure below which the valve disks 14 and 18 o~ the gas fitting will be lifted off their valve faces 12 and 13.
A~ has been mentioned before, the gas fitting is equipped, in the case of the illustrated embodiment of the invention, with a first solenoid valve 25 whose armature 22 extends coaxially to the rod 20 and to the control spring 27 and which is equipped with a central bore accommodating these ... . ..... . .. ... . . .
2032~
latter components. The lower end of the armature 22 is surrounded by a helical pressure spring 52 whose lower end is supported on a shoulder of the armature 22 which, in the case of the illustrated embodiment, is formed by a snap ring 53 fitted in an annular groove of the armature 22. The upper end of the helical pressure spring 53 is supported on the lower end face of a magnetic flux sleeve 54 of the solenoid 25. In the non-excited condition of the solenoid 25, the armature 22 bears against the upper surface of the upper valve disk 18 under the action of the helical pressure spring 52, thus keeping the gas fitting closed. If, however, the solenoid is excited, by feeding current to the coil 55 surrounding the magnetic flux sleeve 54, then the armature 22 is lifted off the valve disk 18, whereby the valve is released and will open or close to a greater or lesser degree, under the action of the control spring 37, depending on the gas pressure prevailing at that time.
Similar to the horizontal walls 6 and 7, the horizontal walls 8 and 9 of the central housing part 1 are likewise provided with valve faces 61 and 62 which coact with valve disks 63 and 64 mounted rigidly on the rod 65. The design of the valve faces 61 and 62, and of the valve disks 63 and 64, as well as their arrangement on the rod 65 is completely identical to the arrangement of the gas fitting described before so that a repeated description can be dispensed with.
There is only one difference insofar as the rod 65 is not connected to the diaphragm of a gas-pressure regulator, but is connected exclusively to an armature 66 of another solenoid valve 67. The armature 66 and the rod 65 are connected in form-locking engagement so that when the armature 66 picks up a~ the coil 68 is excited, the valve disks 63 and 64 will be forcedly lifted off their valve ~aces 61 and 62. In the non-excited condition of the 2032~
solenoid valve 67, the valve disks 63 and 64 are retained in their closed positions by a helical pressure spring 69 which is arranged to surround the armature 66 and which in its turn is supported by the lower end of a magnetic flux sleeve 70 and, at its other end, on the upper face of the valve disk 63.
Similar to the way in which the lower central chamber 5 of the central housing part 1 is closed by the partition 34, the upper central chamber 4 of the central housing part 1 is closed a ferromagnetic plate 71 being part of the magnet arrangements of the two solenoid valves 25 and 67. The ferromagnetic plate 71 accommodates the magnetic flux sleeves 54 and 70 of the two solenoid valves, which are screwed into the plate and which are surrounded by the coils 55 and 68. The upper ends of the magnetic flux sleeves 5~
and 70 projecting from the coils 55 and 68 are interconnected by another ferromagnetic plate 72. The arrangement is such that the two magnetic flux sleeves 54 and 70 are connected in series with respect to the magnetic flux.
If, in the illustrated arrangement, the two magnet valves are excited and are, thus, in their open po~itions, or released for assuming their open positions, a gas flow is allowed to pass from the inlet chamber 2 through a filter 23 arranged therein and then, in the form of two parallel flows, through the open valve face~ 12 and 13 and into the central chambers 4 and 5, After having passed the valve faces 61 and 62, the flows are then united again in the outlet chamber 3 from where they can be supplied to a consumer connected to the central housing part 1. The gas flow can be lnterrupted by closing one of the two valves. It will be readily appreciated that in the clo~ed condition of the ~as ~ittin~, the gas pressure in the chamber 2 will act :, ' , ' :
.: ~ ' ~ '' ;
;~()3Z~
upon the upper valve disk 18 in the opening direction, and upon the lower valve disk 14 in the closing direction so that the forces exerted upon these two valve disks by the gas pressure will balance out each other. It is important in this connection that the active surfaces of the two valve sections defined by the cutter-shaped edges on the valve disk 14 and the valve seat 12 must be equai. The valve, and in particular the gas-pressure regulator 24, operate absolutely independently of the pressure of the uncontrolled gas flow. The same applies by analogy to the valve arranged downstream of the valve where the gas loading the valve disk 43 in the upper chamber 4 acts in the closing direction, whereas the gas in the lower chamber 4 acts on the valve face 64 in the opening sense The forces acting on the valve disks 63 and 64, therefore, balance out each other here, too. Consequently, no important pressures are required either to keep this second valve closed, or to open it against the prevailing gas pressure.
Simple regulation of the outlet pressure is achieved by means of a proportional magnet 26. To this effect, another housing 27 is mounted, for example flange-mounted by means of screws 28, at the bottom of the lower housing part 31.
The housing 27 accommodates the magnet coil 29 of the proportional magnet 26. The ring-shaped magnet coil 29 comprises a central opening accommodating a magnetic flux ~leeve 30 and an armature 39. The axes of the magnet coil 29, the magnetic flux sleeve 30 and the armature 39 extend coaxially to the axis of the rod 20. ~elow the diaphragm 21, the rod 20 i~ equipped with an extension 44 which extends axially through the armature 39 and which is fastened on the armature 39, for example by means of a setscrew 45. The extension 44 and the rod 20 may be formed as a single piece, .... .. . . . ...
, , .
2032~
although the extension 44 may also be screwed into the end of the rod 20, via a thread, directly below the diaphragm 21, or be connected to the lower end of the rod 20, for example via a spring (not shown in the drawing).
Now, when the proportional magnet 26 is excited, as the magnet coil 29 is supplied with an excitation current, the armature 39 is pulled toward the lower end of the housing 27, as viewed in fig. 1. This has the consequence that the opening cross-section of the valves constituted by the two valve disks 14 and 18 and the two valve faces 13 and 20 is reduced. The actuating force of the proportional magnet 26, therefore, counteracts the force of the control spring 37 so that the valve cross-section is reduced when the actuating force in increased. It is thus possible to control the flow cross-section of the valve by the proportional magnet 26.
Considering that the actuating force of the proportional magnet 26 is independent of the position of the armature 39 in the ma~net coil 29, any change of the actuating force will always lead to the same variation of the flow cross-section of the valve, regardless of the importance of the force of the control spring 37, i.e. regardless of the particular setting of the adjusting spindle 43.
Fig. 2 shows a dia~ram illustrating the basic principle of the gas fitting, where the tension spring 37 acts upon the upper end of the rod 20 at a force F~, while the extension 44, with the armature 39 mounted thereon, i8 fixed at the lower end of the rod 20. The armature 39 is guided for vertical displacement in the magnet coil 29 of the proportional magnet which i9 indicated generally by 26. In addition, the lower end of the rod 20 i9 coupled with the diaphragm 21 whose upper surface is subjected to the action of the outlet pressure Pn, while its lower surface i8 ;
. . . :: . .
. . ~ . , ~ .
:; . . . .
203~21~.~
subjected to the action of the surrounding air pressure, so that the resultant force FP acts upon the rod 20. When a current flows through the magnet coil 29 of the proportional magnet 26, then the proportional magnet 26 exerts upon the rod 20 a force FM opposite to the force of the control spring 37. In the stabilized condition, there ~ n equilibrium of forces, the force FF of the control spring 37 being equal to the sum of the forces of the diaphragm 21 and the proportional magnet 26. Therefore, the following relationship applies:
FF = FP + FM.
From this it appears that a higher current flowing through the magnet coil 29 gives rise to a higher actuating force FM
of the proportional magnet 26, with the result that the rod 20 is lowered until the force FF of the control spring 37 has risen to an amount where the equilibrium of forces is restored. The downward movement of the rod 20 leads to a reduction of the valve cross-section and, consequently, to a lower outlet pressure Pa . When the current flowing through the magnet coil 29 rises, then the flow cross-section of the valve increases so that the outlet pressure P~ increases, too. Due to the gas-pressure regulator, this process is independent of the magnitude of the inlet pressure P~, any variations of the inner pressure P~ being balanced out already by the gas-pressure regulator 24. It will be readily understood that it is thus possible in a simple way to control the flow cross-section of the valve and, as a function thereof, the outlet pressure Pu of the gas fitting, and, accordingly, the burner efficiency by the current flowing through the magnet coil 29.
.
. . .
, ~ . . .
~ 16 -Z032Z~3 If the force FM of the proportional magnet 26 is increased by the amount F, with the force FF of the control spring 27 remaining constant, then the force Fp of the gas-pressure regulator 24, i.e. the force FP acting upon the diaphragm 21, must decrease by exactly that amount F in order to meet the conditions of the before-described equation. Given the fact, however, that the surface of the diaphragm 21 remains constant, the force FP can be lowered by the amount F only by lowering the outlet pressure Pa.
It is understood that the invention is not limited to the illustrated embodiment, but that certain deviations are imaginable including, for example, an arrangement doing without the second valve, or using valves having only a single valve disk.
. .
.~ .
~, ~ , ...... .
. . .
Claims (10)
1) Gas fitting, in particular for gas-firing systems, comprising a housing containing two chambers which are connected via an inlet and/or outlet and which are separated one from the other by a wall provided with a valve face, and comprising further a rod extending in perpendicular direction relative to the wall, which rod can be displaced in longitudinal direction by means of a drive and is equipped with a valve disk coacting with the valve face, the gas fitting being further equipped with a gas-pressure regulator acting upon the rod, w h e r e i n said rod is connected to the armature of a proportional magnet which counteracts the force of said drive.
2) Gas fitting according to claim 1, w h e r e i n the said proportional magnet is designed in such a way that as long as the current remains constant, a constant force is exerted upon the armature which is arranged in the coil for movement in the longitudinal direction.
3) Gas fitting according to claim 1 or 2, w h e r e i n said proportional magnet presents a linear relationship between the excitation current and the actuating force.
4) Gas fitting according to claim 1 or 2, w h e r e i n said proportional magnet acts in the closing direction of said valve.
5) Gas fitting according to claim 1, w h e r e i n the actuating force of said proportional magnet at maximum excitation current is at least equal to the actuating force of said drive.
6) Gas fitting according to claim 1, w h e r e i n the said proportional magnet is controlled by a dither signal.
7) Gas fitting according to claim 5 or 6, w h e r e i n the actuating force of said proportional magnet is infinitely variable.
8) Gas fitting according to claim 1 or 2, w h e r e i n said armature of said proportional magnet is connected to said rod via a vibration damper or a spring.
9) Gas fitting according to claim 1 or 2, w h e r e i n said proportional magnet be designed as flange-mounting retrofit assembly.
10) Gas fitting according to claim 1 or 2, w h e r e i n said rod is arranged in such a way that it transfers said valve disk into its open or closed position, and said gas-pressure regulator serves for balancing out any variations of the inlet pressure Pe relative to the atmospheric pressure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3942437.5 | 1989-12-22 | ||
| DE3942437A DE3942437C3 (en) | 1989-12-22 | 1989-12-22 | Gas valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2032283A1 CA2032283A1 (en) | 1991-06-23 |
| CA2032283C true CA2032283C (en) | 1994-01-18 |
Family
ID=6396109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002032283A Expired - Fee Related CA2032283C (en) | 1989-12-22 | 1990-12-14 | Gas fitting |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0433595A1 (en) |
| CA (1) | CA2032283C (en) |
| DE (1) | DE3942437C3 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4033946C2 (en) * | 1990-10-25 | 1999-11-11 | Rausch & Pausch | Hydraulic 2-2 way magnetic valve - has 2 valve elements raised simultaneously from valve seats via magnetic armature |
| DE9316918U1 (en) * | 1993-11-05 | 1994-01-13 | Karl Dungs GmbH & Co, 73660 Urbach | Multiple actuator with controller on the input side |
| DE19525384C2 (en) * | 1995-07-12 | 2003-07-10 | Dungs Karl Gmbh & Co | Double safety solenoid valve |
| AUPO412896A0 (en) * | 1996-12-11 | 1997-01-09 | Upham, John D. | Electromagnetic gas injection valve |
| AU751916B2 (en) * | 1996-12-11 | 2002-08-29 | John Dillon Upham | Pressure balanced gas injection valve |
| DE19733577B4 (en) * | 1997-08-02 | 2006-04-13 | Pierburg Gmbh | Electric changeover valve |
| US6386234B2 (en) | 2000-02-05 | 2002-05-14 | Karl Dungs Gmbh & Co. | Overtravel-double seat magnetic valve |
| ITPD20050250A1 (en) * | 2005-08-09 | 2007-02-10 | Sit La Precisa Spa | VALVE GROUP FOR THE CONTROL OF THE DELIVERY OF A FUEL GAS |
| DE102011053152A1 (en) * | 2011-08-31 | 2013-02-28 | Karl Dungs Gmbh & Co. Kg | Device for controlling the amount of fuel through a fuel line |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1056894B (en) * | 1957-07-01 | 1959-05-06 | Franz Schmidt | Control spool with magnetic drive |
| DE1163450B (en) * | 1958-04-30 | 1964-02-20 | Buerkert Christian | Alternating current operated plunger solenoid, especially for valves |
| AT234449B (en) * | 1961-02-06 | 1964-07-10 | Kromschroeder Ag G | Electromagnetically controlled valve |
| AT226488B (en) * | 1961-02-06 | 1963-03-25 | Kromschroeder Ag G | Electromagnetically controlled valve |
| AT244699B (en) * | 1964-05-04 | 1966-01-25 | Kromschroeder Ag G | Valve with a small volume setting device |
| AT253884B (en) * | 1964-10-20 | 1967-04-25 | Kromschroeder Ag G | Valve with a small quantity setting device assigned to its closing element |
| US3385559A (en) * | 1965-05-12 | 1968-05-28 | Automatic Switch Co | Releasable latch mechanism for control devices, valves, and the like |
| DE2209206A1 (en) * | 1972-02-26 | 1973-08-30 | Mainz Gmbh Feinmech Werke | HYDRAULIC DIRECTIONAL VALVE WITH ELECTROMAGNETICALLY ACTUATED SPOOL |
| US3900822A (en) * | 1974-03-12 | 1975-08-19 | Ledex Inc | Proportional solenoid |
| US4023593A (en) * | 1976-02-17 | 1977-05-17 | The Rucker Company | Valve and control therefor |
| DE2809701A1 (en) * | 1978-03-07 | 1979-09-13 | Kromschroeder Ag G | Two stage electromagnetic gas supply control valve - has two armatures with coaxial spindles between oscillation damper and valve member |
| IT7822089V0 (en) * | 1978-06-12 | 1978-06-12 | Beretta A Costruzioni Metallic | CONTINUOUS STABILIZER OF THE COMBUSTIBLE GAS PRESSURE, ESPECIALLY APPLICABLE TO HEATING APPLIANCES, SUCH AS BOILERS AND SIMILAR. |
| DE3015980A1 (en) * | 1980-04-25 | 1981-11-05 | Honeywell B.V., Amsterdam | GAS PRESSURE REGULATOR |
| DE3146591A1 (en) * | 1981-11-25 | 1983-06-01 | Karl Dungs Gmbh & Co, 7067 Urbach | "VALVE OR REGULATOR" |
| US4546955A (en) * | 1982-10-14 | 1985-10-15 | Honeywell Inc. | Two-stage solenoid valve |
| US4515343A (en) * | 1983-03-28 | 1985-05-07 | Fev Forschungsgesellschaft fur Energietechnik und ver Brennungsmotoren mbH | Arrangement for electromagnetically operated actuators |
| DE3345561A1 (en) * | 1983-12-16 | 1985-07-11 | Gräber, Peter, 7541 Straubenhardt | GAS PRESSURE REGULATOR-SAFETY SOLENOID VALVE COMBINATION |
| EP0272348B1 (en) * | 1986-12-24 | 1989-10-11 | Honeywell B.V. | Gas regulation apparatus having a servo pressure regulator |
-
1989
- 1989-12-22 DE DE3942437A patent/DE3942437C3/en not_active Expired - Fee Related
-
1990
- 1990-10-15 EP EP90119718A patent/EP0433595A1/en not_active Withdrawn
- 1990-12-14 CA CA002032283A patent/CA2032283C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE3942437C3 (en) | 1994-04-07 |
| DE3942437C2 (en) | 1991-10-10 |
| DE3942437A1 (en) | 1991-07-04 |
| CA2032283A1 (en) | 1991-06-23 |
| EP0433595A1 (en) | 1991-06-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |