JPS5930958B2 - valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve device particularly for use in a device for producing dry pressurized air, the valve device having an inlet opening, an outlet opening, and a valve located between these and closing in response to the pressure at the inlet opening. and a possible diversion opening.

A valve arrangement of this type is described in GB 1 238 325, which relates to a dry air installation incorporating a valve arrangement located between the outlet of the compressor and the inlet of an adsorption filter.

This known valve arrangement has an oil and water separator between an inlet opening and an outlet opening, which separator separates the liquid condensate from the supersaturated pressure air stream and transfers it to the operation of the compressor. It is used to collect the liquid in the collection chamber.

In this valve arrangement, the diversion opening is opened by a solenoid valve, which itself is controlled by a pressure switch, which is activated when the pressure in the pressurized air tank reaches a predetermined value.

At the same time, the compressor is deactivated and the solenoid valve is energized, which immediately responds.

When the diverter opening is opened, the condensate can flow out of the collection chamber, and when the compressor is stopped, the air that is led through the adsorption filter against the conveying direction can also subsequently flow out in order to regenerate it.

The valve arrangement described above is not necessarily manufactured with great care; for example, it requires a separate control device, which results in problems, especially in terms of export.

In other words, the supply voltage and/or frequency are often different between the producing country and the importing country, and furthermore, the safety measures regulations are also often different.

Therefore, in order to operate this device, it is often necessary to perform complicated repair work, and such modification work can be expensive in any case. In some cases, this can become extremely difficult and may even lead to litigation issues.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an improvement to a valve arrangement of the type mentioned at the outset, so that this arrangement does not have to be dependent on a separate external control device.

In order to solve this problem, according to the present invention, the five branch flow openings can be closed by a valve stem fixed to a diaphragm,
This diaphragm is loaded on one side by the pressure at the inlet opening and on the other side by a negative pressure derived from the inlet opening pressure via a suction flow nozzle arrangement configured as an outlet of the holder, and A suction flow nozzle arrangement is provided between the diaphragm and the outlet opening, and an auxiliary valve is provided in parallel to the suction flow nozzle arrangement, the auxiliary valve.

The connection between the side of the diaphragm opposite the inlet opening and the atmosphere is opened when the pressure in the valve device decays below a predetermined minimum pressure.

The valve arrangement according to the invention is therefore particularly advantageous when meeting foreign demands, since it is actuated solely by the pressure supplied by the pressurized air source or by the pressure derived therefrom, without any external control devices being involved.

That is, for example, when this valve device is applied to dry air equipment, it is only necessary to prepare a compressor or a drive motor that matches the supply voltage and frequency of the region concerned.

Furthermore, when connecting this valve device to an existing pressure circuit,
Omitting other control energy and control devices in this way has a significant effect.

Furthermore, according to the invention, an auxiliary valve is provided in a meandering manner for the blower flow nozzle device, which auxiliary valve prevents the pressure at the outlet opening and thus at other points of the valve device.

When the pressure decays below a predetermined minimum pressure, the connecting passage between the chamber located on the side of the diaphragm opposite the inlet opening, ie on the diaphragm, and the atmosphere is opened.

If such an auxiliary valve is used. When this valve device is applied to dry air equipment, it becomes possible to close the diversion opening before the pressure inside the adsorption filter reaches the atmospheric pressure value after the compressor is stopped, and therefore after a short compressor operation interruption. The introduction of compressed air into the compressed air tank can be resumed immediately.

It should be noted that it is possible to modify this type of auxiliary valve somewhat to make it suitable for many other applications, in which case not only the system internal pressure but also the negative pressure chamber is required to control the closing member. It is also relevant whether there is a flow in the suction flow nozzle arrangement which results in a lower pressure on the inlet side.

In the valve arrangement of the invention, a bypass valve or check valve is connected in parallel to the suction flow nozzle arrangement.

It is particularly advantageous if the bypass or check valve opens if the pressure at the inlet opening exceeds the pressure at the outlet opening by a predetermined value.

In this way, it is possible to design only the suction flow nozzle arrangement according to the desired pressure attenuation on one side of the diaphragm, and in this case the main part of the conveyed pressurized air only after the start-up phase. Since the air flows through parallel-connected check valves, no significant pressure loss occurs during pressurized air conveyance.

When the valve arrangement according to the invention is used in a dry air installation, the suction flow nozzle arrangement and the check valve are provided with a separate isolation valve which opens when the pressure at the outlet opening exceeds the pressure at the inlet opening. It has been confirmed that it is advantageous to provide

This shut-off valve makes it possible to pass the pressurized air flowing through the adsorption filter of the dry air installation during the regeneration phase through the diverter opening and, in a particularly advantageous manner, to the entire system very quickly after shut-off of the compressor. The internal pressure can be brought to atmospheric pressure, and therefore the amount of regeneration air can be reduced.

According to an advantageous embodiment of the invention, the auxiliary valve is provided with a diaphragm, which is loaded on one side by the pressure at the outlet opening and on the other side by a pressure spring. Communication with the atmosphere is established when the force exerted on the diaphragm by the diaphragm exceeds the force exerted on the opposite surface of the diaphragm by the pressure at the outlet opening.

According to yet another actual foil example, an auxiliary valve is provided in parallel with the suction conduit and the negative pressure chamber of the suction flow nozzle device (boulder outlet), and the suction flow nozzle device (boulder outlet) is provided with an auxiliary valve. In addition, there is no flow that would create a lower pressure on the inlet side.

If the pressure in the auxiliary valve falls below a predetermined minimum value, the auxiliary valve allows communication between the side of the diaphragm opposite the inlet opening and the atmosphere to be established.

In the embodiment described above, the closing member of the auxiliary valve is loaded by a pressure and a spring force occurring in the suction connection of the suction flow nozzle arrangement on one side which causes the opening of the auxiliary valve upon overcoming the force; On the other side, it can be loaded by pressures occurring in the conduits of other individual valves.

Furthermore, it is also possible in this case for the effective adjustment surface of the closing member on the side opposite the spring to be larger than on the side on which the spring acts by a surface element depending on the predetermined minimum pressure and the spring force, or It is also possible to provide the closing member with a diaphragm which, under pneumatic force, resists the spring force and seals against the closing opening of the auxiliary valve.

Furthermore, it is expedient in the valve arrangement according to the invention if a throttle valve is arranged between the outlet of the auxiliary valve and the atmosphere.

It is also advantageous if all the individual valves together with the oil/water separator are combined in one common housing block, in which case the housing block is mounted in close proximity to the adsorption filter.

It is even more effective if this adsorption filter and, if appropriate, further components form a closed component.

Furthermore, in the valve arrangement according to the invention, it is advantageous if a noise damping filter is arranged in the diverter opening of the valve housing.

The invention will now be explained in more detail with reference to the exemplary embodiment shown: The device shown in FIG. However, if a normal compressed air cylinder is used as the compressed air source, the cooling device can of course be omitted.

A valve device 14 having a separator for separating oil and water and a flow dividing opening 16 is arranged downstream of the cooling device 12.

A filter 18 is located behind this valve device 14.

As can be seen in FIG. 2, this has an adsorption filter and an additional mechanical filter and a separate valve arrangement 20
It is connected to the pressurized air tank 22 via.

Is the compressor 10 operating? As long as the compressed air cylinder is opened, the unpurified pressurized air, after being cooled and prepurified in the valve arrangement 14, is further purified and dried by the filter 18 and is passed through the second valve arrangement 20. Pressurized air flows into tank 22.

The mode of operation of the apparatus shown in FIG. 1 during this operating phase and the components or components used for its operation are generally conventional and will not be described here.

As soon as the desired pressure has been built up in this pressurized air tank 22, the compressor 10 is switched off via a pressure switch 24 which is connected to the pressurized air tank 22.

By the way, in the known devices of the type mentioned at the outset, which work with a single adsorption filter, a regeneration cycle is started automatically after the compressor 10 has been shut off, and during its course, that is, during the regeneration phase, a predetermined amount of drying is carried out. In the device according to the invention shown in FIG. Unless the air humidity reaches or exceeds a predetermined upper limit.

The second valve arrangement 2 prevents the initiation of the regeneration cycle.
Furthermore, the pressure air necessary for regenerating the filter 18 is taken directly from the pressure air tank 22,
No auxiliary tank is used as in known devices.

In an advantageous embodiment of the device of FIG.
and the valve device 14 are combined into one assembly unit as shown in FIG. 2, to which the cooling device 12 and a part of the second valve device 20 are additionally attached.

When the compressor 10 is activated, the assembled unit in FIG. 2 is supplied with pressurized air via the supply conduit 26, which air is brought to a relatively high temperature by the compression process, reaching a temperature of about 115 DEG C.

Purification and drying of this pressurized air is first started at a temperature of about 60°C, so the heated pressurized air is
It must first be cooled to this temperature.

This cooling can be performed within the cooling hose 28 that is wrapped around the entire length of the adsorption filter 30;
Reference numeral 8 forms a part of the cooling device designated by the reference numeral 12 in FIG.

The compressed air cooled in the cooling hose 28 is transferred to the inlet opening 3
2 into the valve device 14.

The valve device 14 includes a separator 34 connected to the inlet opening 32 and having the effect of creating a cyclone.

In this oil and water separator 34, after cooling in the cooling hose 28, the supersaturated pressure air is purified from the condensation products, which are transferred to the separator below the deflection plate 38. They are collected at the lower end 36.

The oil and water separator 34 is located in a chamber closed on top by a diaphragm 40, and on the lower side of the diagram facing this chamber cooperates with a valve seat 46 provided at the lower end 36 of the two chambers. The valve stem 42 is fixed, and the valve stem 42
and valve seat 46 cooperate to form the closable diverter opening 16 in the apparatus of FIG.

At the upper end of the chamber containing the separator 34 there is a filter sieve 50
There are outlet passages 48 which lead to various individual valves in the valve arrangement 14, there being a total of four individual valves, referenced 52 to 55.

Its functions are described below.

The first of these individual valves is a suction flow nozzle arrangement, which is shown in conventional form as a holder outlet (boulder nozzle) 52, the nozzle opening of which is , a chamber 5 connected to a hollow chamber 58 located above the diaphragm 40 via a communicating conduit 56
5'.

When pressurized air enters the valve arrangement 14 via the inlet opening 32, a negative pressure is created in the chamber 55', which acts on the upper side of the diaphragm 40 via the communication conduit 56 and the hollow chamber 58. and in turn attracts the valve stem 42 to the valve seat 46,
Therefore, the compressed air supplied from the compressor 10 does not escape through the diversion opening 16.

A bypass valve 53 is arranged as a second individual valve in parallel with the air outlet 52 of this boulder, and the pressure drop is approximately 0.1.
Since this bypass valve 53 is designed to open when the crowbar is reached, only a relatively small pressure loss occurs even when the amount of temporary carriages is relatively large.On the other hand, the outlet 52 of the boulder is Diaphragm 4 throughout the cycle
The pressure difference between the upper and lower sides of 0 is maintained at approximately 1 bar.

Further individual valves 54, 55, which will be described later, remain closed while the compressor 10 is supplying air to the compressed air tank 22, and behind these individual valves 52-55 there are outlet openings of the valve arrangement 14. 60 is located.

The prepurified supersaturated pressure air passes from the outlet opening 60 through another filter sieve 62 into the adsorption filter 30 , where the dried pressure air is passed along the upper end of the adsorption filter 30 to a sintered filter 64 and downstream. passes through a filter 66;
This pressurized air leaving the filter 18 finally reaches the pressurized air tank 22 via a conduit 68 containing a check valve 69 .

A valve 70 is connected to the pressure air tank 22, but -
Like the check valve 69, this valve 70 is a component of the second valve device 20 in FIG. 1, and is shown in detail in FIG.

The outlet of this valve 70 is connected to the filter 18 via a return conduit 72.
In particular, it is connected to the filter head 74 itself.

The valve 70 has as its operating element a plastic snack belt 76 made of, for example, polyamide, which expands as the humidity of the compressed air stored in the compressed air tank increases; The other belt end 80 is connected rigidly to the valve casing of the valve 70 at the pivot point 8.
It is connected to the free end of an L-shaped bar 82 which is pivotable about 4.

The L-shaped bar leg, which is not in contact with the plastic snack belt 76, has a sealing element, for example in the form of a small rubber plate 86, by means of which the valve opening 88 can be closed.

The legs of the L-shaped bar 82 carrying this rubber plate 86 are plate-shaped in the case of the valve 70 and are loaded by the internal pressure of the compressed air pump 22 .

In order to compensate for this pressure value, a pressing spring 90 is provided which acts on the upper side of the plate-like leg.

The design of the plastic belt 76, the length of both legs of the L-shaped bar 82, the area of the legs supporting the rubber plate 86, and the push spring 90 is such that the humidity of the pressurized air in the pressurized air tank 22 is maintained at a predetermined level. When the value is reached, the rubber plate 86 opens the valve opening 88, so that the compressor 10 is shut off.

One arrangement is made such that the regeneration cycle is initiated as soon as the diversion opening 16 is opened.

When the compressor 10 is shut off, the diaphragm 4
Pressure compensation (cancellation) between the upper and lower sides of 0 can be performed.

This is because, due to the interruption of the flow, the outlet 52 of the boulder is no longer able to maintain a negative pressure in the cavity 58.

With this pressure compensation in place, the valve stem 42 lifts off the valve seat 46 so that the two-way flow opening 16 opens and the oil and water mixture collected during the dispensing process is advantageously transferred to the noise attenuator. The pressurized air which flows out to the outside via this diverter opening 16 which is downstream connected and which then remains in the filter flows out via a third individual valve which is designed as a shut-off valve 54 .

When shutting off the compressor or pressurized air source, the valve 70
The states inside the adsorption filter 30 and the valve device 14 differ depending on the switching position.

If the valve 70 is closed when the compressor 10 is shut off, in other words, if the pressurized air in the compressed air tank 22 is so dry that no regeneration of the adsorption filter 30 is required, the adsorption filter 30 and valve device 1
The pressure in the pressurized air tank 22 falls to atmospheric pressure, and the air system remains inactive until the pressure in the compressed air tank 22 exceeds its lower limit, and then the compressor 10 is started anew by the pressure regulator 24.

When fresh air flows into the separator 34 from the compressor 10, the diaphragm 40 is immediately lifted up and the 1-separation port 16 is closed, so that the pressurized air passes through the filter 18 and returns to the pressure via the conduit 68. The air is returned to the air tank 22.

Conversely, if the valve 70 is open when the compressor 10 is shut off, after pressure compensation on both sides of the diaphragm 40 and after the opening of the diversion opening 16.

Dry pressurized air flows from the pressurized air tank 22 into the adsorption filter 30, thereby regenerating the adsorption filter 30.

In this case, the pressure inside the adsorption filter 30 and the valve device 14 decreases to almost atmospheric pressure, and the pressure generated in the valve device 14 decreases to almost atmospheric pressure.
adjusted according to the flow state and flow resistance within the
The regeneration cycle ends as soon as the compressor is started anew.

For example, when the compressor 10
If operation is interrupted only for a very short time, for example less than 5 seconds, there is a risk that the pressure in the valve arrangement 14 and the filter 18 will not fall satisfactorily to atmospheric pressure.

In that case, the pressurized air delivered from the compressor 10 will not have the ability to lift the diaphragm 40, so unless special precautions are taken, if the 1 part volume port 16 is open, all the air delivered from the compressor 10 will be Effectively diverting opening 1
6, and will end up in an equilibrium state where it will escape.

To cope with this, a fourth individual valve is provided, which is designed as a shut-off valve 55 which is pneumatically operable against the force of a return adjustment spring and is as shown in FIG. It has a piston 96, which is housed in the housing and is loaded with the pressure in the filter 18 via the communication line 92 and the outlet opening 60.

A push spring 94 acts on the lower side of the piston 96.

As soon as the pressure above the piston 96 falls below a predetermined lower limit, the pressure spring 94 presses the piston 96 upwards, causing the hollow chamber 58 above the diaphragm 40 and the throttle valve 98 opening to the atmosphere to open. communicate between.

Therefore, when the compressor 10 is started again after a short interruption, the desired pressure difference on the upper and lower sides of the diaphragm 40 is achieved very quickly, so that the diverting opening 16 is reliably closed after a short starting phase, and then the pressure is supplied again. Air can be supplied to the tank 22.

On the other hand, whatever form the shutoff valve 55 takes, it does not interfere with the return flow of pressurized air from the pressurized air tank 22 through the adsorption filter 30.

This is because during the regeneration phase only a small amount and small pressure of air flows through the valve arrangement.

Therefore, pressure compensation between the upper side and the lower side of the diaphragm 40 is always ensured.

The shutoff valve 55 has a diaphragm instead of a piston, which closes the valve opening leading to the throttle valve 98 when the pressure at the outlet opening 60 of the valve arrangement 14 becomes high enough, so that the pressure of the compression spring It is advantageous if the valve opening is lifted up and opened when the valve opening decreases.

As already mentioned, the upper end of the suction filter 30 is provided with its own filter head 74.

There is a hollow chamber inside thereof that houses a post-filter 66, and a sintered filter 64 is arranged below the post-filter 66.

A supply conduit 26 is guided through this filter head 74.

Hot pressurized air coming from the compressor 10 flows through this supply conduit 26.

The advantage of such an arrangement is that the filter head 74 is heated during operation of the compressor 10, so that the pressurized air entering via the return conduit 72 is warmed during the regeneration phase.

As a result, a more effective drying effect can be obtained.

As is clear from the foregoing, the device of FIG. Conduit 26.72 is connected to filter head 7
4 is laid out in such a way that it is satisfactorily heated and that the heat transfer to the return conduit 72 is satisfactory.

Yet another advantage of this configuration according to the invention is:

Since all parts of the valve arrangement 14 are housed in a single block of material 1, such as aluminum, which conducts heat well, there is a substantial temperature drop between the inlet opening 32 and the outlet opening 60. One example is that there is no.

This is because adsorption filters are extremely sensitive to supersaturated pressure air.

This is especially important.

By configuring the filter and valve device in this way,
Behind the oil and water separator 34 there is virtually no further cooling of the pressure air, so that the adsorption filter 3 is connected directly to the housing block of the valve arrangement 14.
0 is supplied with saturated (not supersaturated) pressure air.

By compactly combining the filter 18 and the valve device 14 into a single structural unit, the load on the adsorption filter 30 is reduced, the regeneration time is shortened, and the filter service life is extended.

A further advantage of this design of the valve arrangement 14 is that all valve functions can be controlled using the existing pneumatic pressure or the pressure derived therefrom, so that no additional control devices, in particular electrical controls, are required. Equipment etc. can be omitted.

As a result, even when assembling and manufacturing the device and exporting it to a foreign country, various domestic and foreign laws regarding electrical safety must be taken into consideration.

There is no need to tune to different supply current voltages and frequencies; all that is required is
All that is required is to install a suitable compressor or compressor drive motor or other pressure source at the appropriate location.

Furthermore, in order to fully utilize the regenerated air and obtain high efficiency, a throttle valve is provided in the return guide device.

It would be advantageous if this significantly damped the stress of the air returned into the adsorption filter.

This function as a throttle valve is performed in this embodiment by a valve opening 88, which is so narrow that the pressure in the adsorption filter 30 is slightly above atmospheric pressure during the regeneration phase.

For example, it is designed to have a diameter of only 0.75 mm.

. In addition, in installations with a compressor, and especially in installations without one, it is advantageous to provide a connection piece for a compressed air cylinder directly at the inlet opening 32.

This is because in this case, if air is supplied from the compressed air circuit, there is no need to cool this compressed air.

The embodiment shown in FIG. 4 (zeta) differs from the embodiment shown in FIG. 2 only in two components, and parts common to both are given the same reference numerals.

One of the constituent parts in this case is a sound-absorbing filter 105 for noise attenuation, which is additionally provided in the one-way divider 16 and consists of two relatively thick filter discs 106. The disk 106 is arranged between a plurality of perforated bearing disks 107 and is connected to the upper bearing disk 1 under it.
07 abuts against the collar 108, and the lower bearing disc 107 is held by a securing disc 109.

The second different component is an auxiliary valve 155, which corresponds to or is constructed somewhat differently from the auxiliary or isolation valve 55 of FIG.

This auxiliary valve 155 is also connected to a conduit 15 that connects the chamber 55' of the outlet 52 of the holder and one outlet 157 to the atmosphere.
A throttle valve 98 is also located within the conduit 158.

The auxiliary valve 155 can assume two positions, an open position and a closed position, although its closing member 160 is loaded on both sides by pressure from conduits 156, 159.

In this case, a pressure spring 161 is additionally provided on the side on which the pressure from the conduit 156 acts.

The auxiliary valve 155 operates under the action of air force and the pressing force of the pressing spring 161.

The conduit 159 is connected to the inlet conduit 162 to the outlet 52 of the holder, while the conduit 156 is connected to the conduit 56 leading to the hollow chamber 58 and to the outlet chamber 55' of the boulder.

The closing member 160 has a diaphragm tightly stretched in the casing, which carries a pressure and sealing plate which opens and closes the outlet opening 163 connected to the conduit 158 and A weak pressure spring 161 is supported on this plate, the other end of which is supported in the casing wall.

Due to the fact that the closure member 160 rests on its seat surrounding the outlet opening 163, the effective adjustment surface on the upper side of the closure member 160 is smaller than the effective adjustment surface on its lower side.

In this case, the adjustment surfaces effective on both sides of the closure member 160 and the force of the pressure spring 161 are mutually synchronized, such that the inflow conduit 16
If a flow movement occurs in the suction flow nozzle arrangement (boulder outlet) 52 in the direction indicated by the arrow marked 2, that is, the pressure in the chamber 55' falls somewhat below the pressure in the inlet conduit 162. If this occurs, the connection between conduit 156 and conduit 158 is interrupted, and on the other hand, the system is stopped, or a weak reverse flow movement occurs, and thus conduit 156.
If no flow movement occurs in the direction of said arrow through the suction flow nozzle arrangement 52 due to equal pressures occurring on both sides of the closing member 160 of the auxiliary valve 155 at 59;
In other words, if no pressure decay occurs within chamber 55',
When the pressure in each conduit connected to the auxiliary valve 155 falls below a predetermined lower limit value, the auxiliary valve 155 is opened by the force of the pressure spring 161.

This auxiliary valve 155 is used for the same purpose as the isolation valve 55 as an auxiliary valve in the first practical case, and operates in principle in the same manner, but it is more efficient under any operating conditions. It can be set more safely, that is, less likely to fail.

This means that if the flow of pressurized air to be supplied to the inlet opening 32 of the valve arrangement 14 is interrupted for a short period of time, for example due to a temporary interruption of the power supply to the compressor, the Due to the flow resistance and the short pause time which is insufficient for complete pressure compensation, pressure remains in the filter device 18 and the valve device 14, which residual pressure is caused in particular by the isolation valve 54. Allowing free backflow, the values are approximately equal at the outlet opening 60 and within the conduit 162.

In the suction flow nozzle device, that is, the outlet 52 of the boulder.

Equal pressure is generated on both sides of the closing member 160 in the auxiliary valve 155, since no flow movements occur that would cause a pressure drop in the chamber 55'.

If the value of this pressure falls below, for example, 3.5 bar, the pressure spring 161 brings the conduits 156 and 158 into communication, so that the interior of these two groove tubes 156, 158, the communication conduit 56 and the hollow chamber 58 is Although it is set to atmospheric pressure, there is still some residual pressure in other systems.

When the pressurized air supply at the inlet opening 32 is started anew, the diaphragm 40 is lifted impulsively and the diverter opening 1
6 is closed, the supplied pressurized air flows through the diversion opening 1.
6, a flow is formed in the direction of the filter 18 without being depressurized, and thus a flow is formed through the inlet conduit 162 and the outlet 52 of the boulder, so that a negative pressure is again created in the chamber 55', and this Negative pressure is applied to the closing member 16 of the auxiliary valve 155
0 and immediately closes the outlet opening 163 against the weak pressure spring 161, thereby allowing negative pressure to be transmitted from the chamber 55' to the hollow chamber 58 above the diaphragm 40.

The throttle valve 98 is used to suppress excessively rapid air flow through the auxiliary valve 155 while the closure member 160 is open and especially in its intermediate position.

By configuring the auxiliary valve 155 as a diaphragm valve.

It operates virtually without friction, which means that the valve device is used especially for oil-free air.

Therefore, it is extremely significant because it does not require lubrication of pistons, etc.

The valve arrangement in the two illustrated embodiments can not only be successfully applied in cases where the supply of pressurized air is started, interrupted or terminated in a purely pneumatically controlled manner;
It can also be used to deload the lines leading from the compressor to the tank without dryers and separators, or as a device without adsorption filters but with only oil and water separators. is also used.

[Brief explanation of the drawings] Figure 1 is a schematic diagram of a device for generating dry pressurized air;
FIG. 2 is an enlarged longitudinal sectional view of the adsorption filter of the device shown in FIG. 1 and the valve device assigned thereto. 3 is a principle diagram of a valve used in the device of FIG. 1 and can be actuated via a humidity-sensitive feeler element; FIG. 4 is an enlarged longitudinal section showing a second embodiment of the valve device according to the invention; FIG. It is a front view. 10...Compressor, 11...Motor, 12...Cooling device, 14...Valve device, 16...Diversion opening, 18... ... Filter, 20 ... Valve device, 22 ... Pressure air tank, 24 ... Pressure switch, 26 ...
... Supply conduit, 28 ... Cooling hose, 30
... Adsorption filter, 32 ... Inlet opening, 34 ... Separator. 36... Lower end of separator, 38... Deflection plate, 40... Diaphragm, 42...
・Valve stem, 46...valve seat, 48...outflow passage, 50...filtration sieve, 52...
Boulder outlet, 53...Bypass valve, 54°55...Shutoff valve, 55'...Chamber, 56
・・・・・・Communication conduit. 58...Hollow chamber, 60...Exit opening,
62... Filter sieve, 64... Sintered filter 1, 66... Post filter, 68...
...Conduit, 69...Check valve, 70...
・Valve, 72...Return conduit, 74...Filter head, 76...Plastic belt,
78.80... Heald end, 82...
L-shaped bar, 84... Turning point, 86...
・Rubber plate, 88...Valve opening. 90... Pressing spring, 92... Communication conduit,
94...Press spring, 96...Piston,
98... Throttle valve. 105...Sound absorption filter for noise attenuation, 106
...Filter disk, 107...Support disk, 108...Brim, 109...Security disk,
155...Auxiliary valve. 156...Conduit, 157...Exit point, 158°159...Conduit, 106...
- Closing member, 161... Pressing spring, 162...
... Inflow conduit, 163 ... Outlet opening.

Claims (1)

[Claims] 1 In a valve device comprising an artificial opening, an outlet opening, and a dividing opening located between these openings that can be closed depending on the pressure at the inlet opening, the dividing opening 16 is connected to the diaphragm 4.
The said inlet is closed via a suction flow nozzle device 52, which can be closed by a valve stem 42 fixed at zero, and whose diaphragm 40 is configured on one side by the pressure at the inlet opening 32 and on the other side as a boulder outlet. A suction flow nozzle arrangement is provided between the diaphragm and the outlet opening 60, each loaded with a negative pressure derived from the opening pressure, and an auxiliary valve 55 is provided in parallel to the suction flow nozzle arrangement. is provided, the auxiliary valve being adapted to open the connection between the diaphragm side 58 opposite the inlet opening and the atmosphere when the pressure in the valve arrangement decays below a predetermined minimum pressure. A valve device characterized by: