DE2931501A1 - Gas pressure vessel stop valve - comprises plug released by piston subjected to internal gas pressure - Google Patents

Abstract

The stop valve is for a vessel containing gas under pressure, particularly in a hand fire extinguisher, the plug being lifted off its seat by a hand-operated actuator. A piston (24) opens the valve, being subjected to the pressure inside the vessel (10) when the actuator (31) is operated. The actuator can be arranged to open a release valve (27,29) in a passage between the vessel interior and the cylinder (24) in which the piston works. The release valve has a stem working in a bore so as to leave an annular gap and a seal shutting off the latter when closed.

Description

Titles shut-off valve for pressurized gas containers and the like, in particular for hand fire extinguishers

The invention relates to a shut-off valve for pressurized gas containers and the like, in particular for hand-held fire extinguishers which the closing member can be lifted from its valve seat by manual actuation of an actuator.

The valve fittings of hand fire extinguishers or other pressurized gas containers are known to be related to Functional reliability made extremely high demands. At the same time, however, the valve fittings should as far as possible build small and simple and can be manufactured with the least possible manufacturing effort. For the The shut-off valves on the cylinder head are usually operated, for example, on hand-held fire extinguishers Actuators in the form of hand levers and the like. Provided. In the case of pressurized gas containers for technical gases the valve actuation, however, mostly by means of handwheels or similar actuators. Both

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high operating pressures result for opening the Shut-off valves require considerable opening forces make hand levers and the like with a correspondingly large transmission ratio and accordingly large dimensions to use the bulky hand lever e.g. on the head of a fire extinguisher or the like. are but highly undesirable when these devices are housed in confined spaces, e.g. in motor vehicles.

When using the handwheel, it is necessary when withdrawing gas or when filling the pressurized gas container Unscrew the prescribed bottle cap that protects the valve during transport.

In the case of hand-held fire extinguishers and other pressurized gas containers that are under permanent pressure, there is an additional one Requirement to provide the container with a display that shows the internal pressure of the container at all times can be read. For this purpose, small pressure gauges are arranged on the valve fittings, which are used in production are relatively expensive and do not always work reliably during long periods of use.

Finally, with handheld fire extinguishers and other pressurized gas containers, it is often necessary to have safety valves to be provided to avoid impermissibly high pressures, such as those that arise when heating fire extinguishers or pressurized gas containers and which would lead to the containers bursting. With hand fire extinguishers separate safety valves are used for these purposes, as the design of the shut-off valves as safety valves due to the high spring closing forces would lead to large opening moments and accordingly inadmissibly large hand levers. It understands that the use of additional safety

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valves to a further increase in manufacturing costs leads.

The object of the invention is primarily to provide one in particular for handheld fire extinguishers, but also for other pressurized containers, such as shut-off valve devices especially for pressurized gas cylinders su create, while maintaining the high funk " reliability and with the smallest possible dimensions even at high operating pressures with little manual force Can be operated reliably without bulky hand levers, handwheels or other large-scale actuating devices are needed.

This object is achieved according to the invention in that a piston is provided to open the shut-off valve, the manual operation of the actuator of the pressure inside the pressurized gas container or the like. can be charged is.

According to the invention is therefore for opening the shut-off valve the operating pressure prevailing in the interior of the container is used, that when the actuating element is manually operated is brought to action on the piston, whereby the closing member coupled to the piston of the Shut-off valve is lifted from its seat. This makes it possible to use the shut-off valve even at high operating pressures and correspondingly large spring closing forces small hand force, which can be applied by finger pressure, to open. At the same time, there is a functionally reliable and small overall arrangement, since the relatively There is no need for heavy and bulky hand levers, hand wheels, etc. The entire valve fitting can be produce with comparatively small dimensions.

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It is advisable to use a connection between the interior of the container and the cylinder space of the piston to arrange a release valve to be opened by the actuator. The release valve can be extremely Build small, so that the overall dimensions of the Valve fitting cannot be enlarged significantly. A release valve is preferably used which consists of a valve rod connected to the actuator, which is located in one of the inner roughness of the container with the bore connecting the cylinder space of the piston, axially displaceable while leaving a circumferential gap and with a rod seal that seals the circumferential gap between the valve rod and the bore in the closed state is provided «The valve rod expediently carries the actuating element at its upper end, while it is in the area its lower end facing the interior of the pressurized gas container carries the rod seal, which in simple Way can consist of at least one O-ring. A release valve of the aforementioned type is emerging mainly characterized by small dimensions, low construction costs and small actuation forces. It can be used as a springless valve be formed because the resetting of the valve rod when the actuator is released by the internal pressure takes place in the container. There is the possibility of the actuator or the release valve one Allocate lock which, with brief manual or finger actuation of the actuating element, the release valve holds in its open position automatic holding open of the shut-off valve via a Any length of time possible Closing the release valve and thus also the shut-off valve can be brought about by actuating the actuator again releasing the lock via the release valve can also be used to vent the cylinder chamber of the

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Piston are accomplished by placing the valve rod receiving bore of the release valve on its the interior of the container facing away from the end is brought into communication with the outside atmosphere.

A particularly expedient embodiment of the valve fitting with the smallest possible dimensions results when the piston is arranged on the closing element or on a valve spindle carrying the closing element of the shut-off valve will. The release valve is advantageously parallel to the axis of the shut-off valve in the common Valve body arranged. However, an embodiment in which the release valve in the axis of the shut-off valve, that is, is arranged coaxially to the axis of the shut-off valve. There is the valve rod in an axial bore, which expediently extends through the closing element, the valve spindle and extending the piston therethrough.

As for opening the shut-off valve according to the invention Only very little manual forces have to be applied, according to the invention there is still the possibility of using the shut-off valve at the same time as a safety valve which limits the internal pressure in the container or the like. In this case, the shut-off valve opens in the direction the operating pressure, whereby the valve closing spring is matched to the response pressure of the safety valve which corresponds to an internal pressure in the container which is considerably higher than the operating pressure.

In particular when using the valve fitting according to the invention In the case of portable pressure cylinders, especially hand-held fire extinguishers, it is advisable to place them on the head of the pressurized gas cylinder a cap to accommodate the shut-off valve, which in the area of a handle has an opening

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has voltage for the actuator and with a the release valve is provided against actuation locking, removable from the locking position locking member. The cap is preferably made of plastic. A finger-operated one is advantageously used as the actuating element Button or the like, provided.

At the same time, the cylinder receiving the piston can be integrally formed on the cap, with the cylinder a metal ring is expediently used. The metal ring is expediently in the before the injection molding process Injection mold introduced and the subsequent fuel zen in one piece with the plastic cap, connected.

The release valve of the valve fitting according to the invention can be designed in a further embodiment in such a way that that it also fulfills the function of the pressure gauge otherwise required for the pressure test. To this end the blocked release valve according to the invention has a free stroke by which it, without opening, against that of the internal pressure of the container or the like. caused restoring force is adjustable. The valve rod can be opened by pressing the actuating element, e.g. the actuating button against the resistance of the pneumatic pressure medium which is under pressure in the pressurized gas container exerts to depress the free stroke, after releasing the actuator this under the restoring force of the pneumatic medium returns to its original position. This reset process is omitted if the internal pressure in the container or the like. has dropped to zero or an impermissibly low value, so that the Resetting behavior of the actuator causes an indication of the pressure state inside the container.

In particular when using the inventive

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shut-off valve as a gas cylinder valve, it is recommended to train the shut-off valve at the same time as a filling valve provided with a filling connection, via which the emptied pressurized gas cylinder e.g. at a filling station with which pressurized gas or liquid gas is filled.

In such pressurized gas containers or pressurized gas cylinders, in which the valve fitting arranged on the cylinder head is protected against external influences by a screwed-on protective cap, it is recommended that the inventive To train shut-off valve and the cap and coordinate with each other that the shut-off valve to remove the contents of the bottle or to fill the bottle can be operated »without this the The protective cap needs to be removed from the bottle. The invention accordingly also includes an arrangement in which the actuator of the shut-off valve is accessible for finger actuation through an opening in the cap is. The cap opening is preferably arranged at the head of the cap, which is expediently arranged on its circumference another opening for removing the contents of the bottle or for filling the bottle with the compressed gas having.

In the drawing, embodiments of the invention are shown, Ee show:

Fig. 1 la vertical section the head area of a hand-held fire extinguisher β with the valve fitting according to the invention arranged here;

FIG. 2 shows a modified embodiment example in the illustration of FIG. 1; FIG.

3 shows a section along line III-III of FIG. 2;

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FIG. 4 shows an embodiment variant of FIG. 2 in side view, partly in vertical section;

5 shows a further exemplary embodiment of the invention in a sectional view corresponding to FIG. 1;

6 shows a gas cylinder valve according to the invention in vertical section .

In the drawing, 10 is a print area The name of an existing pressurized gas container which, in the case of a hand-held fire extinguisher, takes the extinguishing agent under a certain operating pressure. For example it is a Halon fire extinguisher better known per se Art.

In the bottle neck 11 of the pressure bottle 10 is a valve body 12 screwed in. The valve body has a stepped axial bore 13, which the functional parts of the shut-off valve and a cross hole 14 is connected to a nozzle 15 through which the extinguishing agent when opening the shut-off valve Pressure leaks

The shut-off valve has a closing element 16, which has an annular seal 17 in an enclosure made of rubber or some other elastic material, with which the locking member can be seen against the valve seat 18 of the valve body 12 in the SohlieBsustand The closing element 16 is pressed into the closed position by a valve spring 19. The valve spring 19 is supported on a stopper 20, with which the riser 21 immersed in the pressure bottle 10 is connected, which establishes the connection between the inner

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space of the pressure bottle and the shut-off valve arranged on the bottle head. The plug 20 is from screwed into the valve body 12 at the bottom.

The closing member 16 of the shut-off valve is attached to a valve spindle 22, which by means of an O-ring 23 is sealed in the axial bore of the valve body and at its upper end carries a piston 24, which in a cylinder space 25 of the valve body 12 is arranged. The cylinder space 25 is of an upper axial Approach of the valve body 12 is formed, which is closed by a screwed-in cylinder base 26.

Axially parallel to the shut-off valve and its actuating piston 24, a release valve is arranged on the valve body 12, which consists of a valve rod 27 with consists of small diameter, which is guided with play in an axial bore 28 of the valve body 12 and in Area of its lower end one consisting of two O-rings Rod seal 29 carries, which saves the circumference seals between the valve rod and the inner wall of the bore 28 in the closed state of the release valve. The bore 28 opens at its lower end into a bore section 30 with an enlarged diameter, which in turn is connected to the interior of the pressure bottle 10 * on the lower end of the valve rod 27 therefore the internal pressure of the pressure bottle 10 acts.

The valve rod 27 carries at its upper end, protruding from the axial bore 28, above a Rod seal 27 'an actuator 31 in the form of an actuator button or the like. When lowering the Button 31 by finger actuation, the valve rod 27 is pressed in the bore 28 downwards, first the upper rod seal 27 'from the atmosphere

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seals. If the valve rod is moved further downwards, the rod seal 29 enters the expanded position Section of the bore 30 so that the interior of the pressure bottle 10 over the bore section 30 as well over the gap channel between the valve rod 27 and the inner wall of the bore 28 and finally over a transverse bore 32 comes into connection with the cylinder space 25 of the piston 24. In the cylinder space 25 builds sioh therefore the internal pressure of the pneumatic pressure medium contained in the pressure bottle, whereby the Closing member 17 of the shut-off valve is lifted from its valve seat 18 against the restoring force of the spring 19 so that the extinguishing agent exits through the open shut-off valve, the transverse bore 14 and the nozzle 15.

When the actuating member 31 is released, the valve rod 27 is opened by the internal pressure in the pressure bottle 10 pushed back into the starting position shown, in which the rod seal 29 seals the bore 28. At the same time, the rod seal 27 'emerges from the bore 28, Here the cylinder space 25 is vented via the transverse bore 32 and the circumferential part in the bore 26, so that the closing member 16 of the shut-off valve by the restoring force of the spring 19 back into the Closing position · is brought.

The pressure bottle has a plastic cap 33 'which covers the valve fitting on the bottle head and is provided with an integrally formed handle 34 and a jacket opening 35 which is located on the handle 34 opposite side in front of the nozzle 15 is located. At the bottom of the approximately cup-shaped cap 33, an opening 36 is arranged in the vicinity of the handle 34, in which the Actuating button 31 is in the closed position of the release valve, as shown in FIG. 1. The actuation button

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31 has a / Hansch-like approach 37 with which he is supported on the underside of the cap base when the release valve is closed. There is also on the cap a locking member 38 is arranged above the handle 34, which grasps with fork-like fingers 39 under the actuating button 31 and thus prevents the When the locking member 38 is in the locked position, the actuating button can be depressed so far that the release valve opens.

The release valve has a free stroke X, which is through the distance between the bottom of the operating button 31 and the top of the fork parts of the locking member 38 is formed and its size is determined by the distance which the rod seal 29 in the Closed position of the release valve from the extended Hole 30 has. When the locking member 38 is in the locked position, the valve rod 27 can therefore be actuated by a finger the button 31 to the free stroke X are pressed down to the stop on the locking member, without opening the release valve. This movement takes place against the resistance of the pressure bottle 10 located medium, which acts on the lower end of the rod 27. When you release the button 31 the rod 27 is automatically returned to the position shown by the internal pressure in the pressure bottle 10 deferred. This resetting process does not take place when the pressure in the pressure bottle 10 is at zero or at a lower limit has fallen, which is mainly due to the friction of the rod seal 29 in the bore 28 is determined. If, therefore, the return of the valve rod 27 to the starting position does not occur, then it is this is an indication of the filling status or the operating pressure in the pressure bottle.

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When using the hand-held fire extinguisher, the locking member 38, which is fixed e.g. by means of a lead-sealed wire is removed, so that the actuator 31 can be depressed so far that the release valve opens and thereby the opening of the shut-off valve by pressurizing the piston 24 is brought about.

The exemplary embodiment according to FIG. 2 largely corresponds Parts which correspond to those according to FIG. 1 have the same reference numerals, whereas in FIG. 1 the release valve axially parallel to the shut-off valve on the valve body 12 located in the axis of the pressure bottle 10 is arranged, is in the exemplary embodiment according to Fig. 2, the release valve in a coaxial position to the shut-off valve. The closing member 16 of the shut-off valve is here connected to the piston 24 via a valve spindle 22, which is designed as a sleeve or with a Axial bore is provided which forms part of the bore 28 of the valve rod 27. The valve rod 27, which also carries the actuating member 31 designed as a push button here at its upper end, is accordingly movable in a bore 28 coinciding with the axis of the bottle and the axis of the shut-off valve, which extends through the valve stem 22, through the piston 24 and through a cylindrical cap 40, which closes the cylinder space 23 at the top and at the same time serves to guide the actuation button 31 axially. The bore extends in the lower area 28 through a bore 38 * of the annular locking member 16. The bore 38 opens into the space 41 of the plug 20, which accommodates the valve spring, in the illustrated embodiment The closed position of the release valve is sealed by the O-rings 29 from the axial bore 28 in the interior of the bore section 38 *. When depressing the valve rod 27, what with the help of a finger on the handle 34

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hand, the rod seal pushes itself 29 in the enlarged spring chamber 41, whereby the connection between the interior of the pressure bottle 10 via the riser pipe 21 and the bore 38, 38 'with the cylinder space 25 is produced. The piston 24 acted upon by the operating pressure lifts the closing member 16 against the restoring force of the spring 19 from its valve seat, so that the extinguishing agent under pressure from the nozzle 15 can emerge. When the operating button 31 is released, the valve rod 27 is activated by the internal pressure in the Pressure bottle 10 returned to the position shown, in which the rod seal 29 seals the bore 38, 38 *. At the same time, the rod seal 27 ' from the bore 28. The cylinder space 25 is through the circumferential gap between the valve rod 27 and the bore 38 of the part 40 vented to the outside.

Fig. 3 shows that the valve body 12 also has a safety valve 42 and a pressure gauge 43 as a pressure indicator can be arranged. The safety valve 42 limits the internal pressure in the pressure bottle 10; it is designed for a response pressure that is considerably higher than the operating pressure. On the pressure gauge 43 can the internal pressure or the filling level of the hand-held fire extinguisher can be read off.

The pressure gauge 43 can be omitted if, as described in connection with FIG. 1, the valve rod 27 of the Release valve when the locking member 38 is in the locked position has a free stroke X, by which it is actuated of the push button 31 can be depressed without opening the release valve, i.e. the Rod seal 29 emerges downward into the enlarged space 41. If the operating button 31 remains in the lowered position Position so this is an indication that

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the internal pressure in the pressure bottle 10 is inadmissible Value has decreased.

The embodiment according to FIG. 4 differs from that according to FIG. 2 essentially only in that that the cylinder part 50 receiving the piston 24

the cup-shaped cap 33 made of plastic

is integrally formed on the inside, such that when the cap 33 is attached, this cylinder part 50 seals against the upper side of the valve body 12 To achieve proper guidance of the piston 24 in the cylinder part, a metal ring 51 is in the cylinder part 50 inserted, on which the piston 24 is guided with its circumferential seal. Preferably the metal ring 51 inserted into the injection mold before the injection process, so that when injecting the cap 33 of the Plastic is overmolded.

FIG. 5 shows an embodiment in which the release valve, as provided in FIG. 1, is axially parallel to the shut-off valve is arranged. While in the embodiment of FIGS. 1 and 2, the shut-off valve is designed as a check valve that opens against the internal pressure in the pressure bottle 10, there is in the Embodiment according to FIG. 5, the shut-off valve from a safety valve, the closing member 16 through the internal pressure in the pressure bottle 10 can be lifted from the valve seat 18 against the restoring force of the spring 19 is. The spindle 22 connecting the piston 24 to the closing member 17 is enclosed by the spring 19. Of the The response pressure of the safety valve is matched to the maximum permissible internal pressure in the pressure bottle 10; it is above the> normal operating pressure. Upon reaching the maximum permissible pressure, the interior of the pressure is opened by opening the safety and shut-off valve.

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bottle 10 Relieved of pressure via nozzle 15. Open that the safety valve in its function as a shut-off valve is also carried out here by means of the release valve, which, as described in connection with FIG. 1, is guided in the bore 28 with play, with a rod seal 29 provided valve rod 27 has. Here, too, a sufficiently large free stroke X is the Valve rod available to get a display of the filling content or the internal pressure and thereby the otherwise to save required pressure gauges.

It goes without saying that also in the embodiment according to FIG. 2, in which the release valve is in the axis of the shut-off valve, the latter, as described in connection with FIG. 5, at the same time as a safety valve can be trained.

Fig. 6 shows a gas cylinder valve, which in construction and largely corresponds to that of FIG. 2 in its mode of operation. The one arranged at the head of the bottle 10 Here, too, the valve fitting is protected inside a protective cap 33, which preferably consists of a screwed-on steel cap * The protective cap 33 has a relatively small finger opening on the head 36 for finger actuation of the push button 31, which is easily accessible under the finger opening 36. An The protective cap 33 '' with a jacket opening is on its jacket 35 provided, through which a connection fitting 60 of the valve body 12 is accessible. To the connection fitting 60, a line can be connected via which the contents of the pressure bottle 10 are removed and / or the Pressure bottle 10 is filled with the pressurized gas at a filling station

In the embodiment according to FIG. 6, the actuating

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Assignment button 31 a lock 61, which consists of two interacting locking rings 61. Such locks are known, for example, in ballpoint pens with pressure actuation to keep the refill in the extended position to keep. The arrangement is accordingly made so that when the push button 31 is depressed, this is in the depressed position is held by the lock 61. As a result, this becomes the valve rod 27 existing release valve and with it the closing member 16 of the shut-off valve held in the open position, so that the contents of the bottle can be removed e.g. via a line connected to the connection fitting 60. If the push button 31 is depressed again by finger operation, the lock is released, so that the release valve 27 and with it the shut-off valve closes.

Instead of the lock described above, however, another locking device with a finger-operated one can also be used mechanical locking element can be used, with which the actuator 31 of the shut-off valve can be releasably set in the open position of the release valve.

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Claims (1)

Note: Carl Esser, Druckgasarmaturen, 5000 Köln AO, Zeiss-Str. Title: Shut-off valve for pressurized gas containers and the like, especially for hand-held fire extinguishers Expectations: Shut-off valve for pressurized gas containers and the like, especially for hand-held fire extinguishers, in which the closing element can be lifted off its valve seat by manual actuation of an actuating member, characterized in that that in order to open the shut-off valve a piston (24) is provided which, during manual operation of the actuating member (31) can be acted upon by the pressure in the interior of the pressurized gas container (10) or the like. Shut-off valve according to claim 1, characterized in that that in a connection between the interior of the compressed gas container (10) and the cylinder space (25) of the piston (24) a release valve (27, 29) to be opened by the actuating element (31) is arranged «, 130Q.0 8/0369 Carl Esser pressurized gas fittings
Ee 257 3. Shut-off valve according to .Anspruch 2, characterized in that that the release valve consists of a valve rod (27) connected to the actuator (31), in one of the interior of the pressure vessel (10) or the like. with the cylinder space (25) of the Piston (24) connecting bore (28) leaving a circumferential gap axially displaceable and is provided with a circumferential gap in the closed state Abdich border rod seal (29). 4. Shut-off valve according to claim 3, characterized in that that the valve rod (27) at its upper end the actuator (31) and in the region of its lower End carries the rod seal (29). 5. Shut-off valve according to claim 3 or 4, characterized in that the valve rod (27) receiving Bore (28) of the release valve at the same time as a vent hole for the cylinder space (25) serves. 6. Shut-off valve according to one of claims 1 to 5 _f, characterized in that the piston (24) is arranged on a valve spindle (22) having the closing member (16). 7. Shut-off valve according to one of claims 2 to 6, characterized in that the release valve is parallel is arranged to the axis of the shut-off valve in the common valve body (12). 8. Shut-off valve according to one of claims 2 to 7, characterized in that the release valve in the axis of the shut-off valve is arranged. 1 30008/0369 293150 Carl Esser pressure fittings
Ee 257 - ϋϊ * 9. Shut-off valve according to claim 8, characterized in that that the valve rod (27) is arranged in a bore (28) which extends through the closing member (16), the valve spindle (22) and the piston (24) extending therethrough. 10. Stop valve according to one of claims 1 to 9, characterized characterized in that it is also designed as a safety valve. 11. Shut-off valve according to one of claims 1 to 10, characterized in that the actuating member (31) from a finger-operated button or the like. consists. 12. Stop valve according to one of claims 1 to 11, daduroh characterized in that it lies protected inside a cap (33), its actuating member (31) is accessible through an opening (36) in the cap for pinger actuation * 13. Shut-off valve according to claim 12, characterized in that the cap (33) in the region of a handle (34) has the opening (36) for the actuating member (31) and the release valve against one Actuation blocking, removable from the blocking position Locking member (38) is provided. 14. Shut-off valve according to claim 12 or 13, characterized in that that on the cap (33) of the piston receiving cylinder (25) is arranged. 15. Shut-off valve according to claim 14, characterized in that the cylinder (50) on the plastic cap (33) is integrally formed, with a metal ring (51) lying in the cylinder (50). 130008/0369 Carl Esser DruckgaearmaturGn
Ee 257 -H- 16. Shut-off valve according to one of claims 2 to 15, characterized in that the blocked release valve has a free stroke (X) by which it can without opening against the internal pressure of the Pressure vessel (10) or the like. caused restoring force is adjustable. 17. Shut-off valve according to one of claims 2 to 16, characterized in that it has a release valve is provided in its open position holding lock. 18. Shut-off valve according to claim 17, characterized in that the lock da8 by switching actuation of the actuating member (31) is releasable. 19 shut-off valve according to one of claims 1 to 18, characterized in that it is designed at the same time as a filling valve and with a filling connection (60) is provided. 13 0008/0369