JP2001221361A - Control valve for pneumatic equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To supply / discharge a small amount of pilot air to a supply / discharge air chamber, quickly switch a supply / discharge valve, prevent wasteful pilot air consumption, and reduce exhaust noise. SOLUTION: A supply / discharge piston 24f is provided in a piston accommodating chamber 24e of a supply / discharge valve 24 formed in a casing 21a.
Are vertically movably accommodated, and a supply / discharge air chamber 24d is formed above the supply / discharge piston of the piston accommodating chamber in a state where the elastic body 24g pushes up the supply / discharge piston. Pilot air for pushing down the supply / discharge piston is supplied to the supply / discharge air chamber, and the supply / discharge valve 24 switches the pneumatic device to communicate with the air tank or the atmosphere by the vertical movement of the supply / discharge piston. A supply / discharge pilot solenoid valve 23 is connected to the supply / discharge air chamber, and the supply / discharge pilot solenoid valve supplies / discharges pilot air to / from the supply / discharge air chamber by an electric signal. Further, a projection is provided on the top surface of the supply / discharge piston so as to narrow the supply / discharge air chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic device, and more particularly to a control valve suitable for supplying and discharging compressed air to and from an air spring which is a suspension device of a vehicle.

[0002]

2. Description of the Related Art Conventionally, as a control valve of this type, as shown in FIG. 3, a supply / discharge valve 3 supplies / discharges pilot air with a supply / discharge pilot solenoid valve 4, so that the left and right air springs ( (Not shown) is switched to communicate with an air tank (not shown) or the atmosphere, and the first switching valve 1 supplies and exhausts pilot air with the first pilot solenoid valve 5, so that one air spring and a supply / discharge valve are provided. And the second switching valve 2 supplies and discharges pilot air with the second pilot solenoid valve 6 so that the other air spring and the supply / discharge valve 3 are connected or disconnected. A control valve 7 is known. The supply / discharge valve 3 is a three-port, two-position switching spring return type air valve, and includes first and second switching valves 1, 2.
Is a two-port, two-position switching spring return air valve.

The supply / discharge valve 3, the first switching valve 1, the second switching valve 2, the supply / discharge pilot solenoid valve 4, the first pilot solenoid valve 5, and the second pilot solenoid valve 6 are integrally formed in a casing 7a. It is formed. The supply / discharge valve 3 is a piston housing chamber 3a formed at the lower right side of the casing 7a.
And a supply / discharge piston 3b accommodated vertically in the piston accommodation chamber 3a, and a supply / discharge air chamber 3c formed above the supply / discharge piston 3b of the piston accommodation chamber 3a. The supply / discharge piston 3b is pushed up by the elastic force of the first spring 3d (compression coil spring), and the supply / discharge air chamber 3c is supplied / discharged in a state where the supply / discharge piston 3b is pushed up by the first spring 3d. The pilot air valve 4 supplies pilot air. In addition, piston 3 for supply and discharge
A relatively large concave portion 3e is formed on the top surface of b, and a supply / discharge valve body 3f is provided below the supply / discharge piston 3b.
The supply / discharge valve body 3f is a second spring 3g (compression coil spring).
And is seated on the supply / discharge valve seat 3h.

The supply / discharge pilot solenoid valve 4 includes a casing 7.
A supply / discharge through hole 4a formed in the upper right part of the right side of FIG. 1A, a fixed plunger 4b inserted in the upper part of the through hole 4a so as not to be vertically movable, and a vertically movable part below the through hole 4a. The inserted movable plunger 4c and the movable plunger 4c
A third spring (not shown) for urging the movable plunger 4c away from the fixed plunger 4b;
And a supply / discharge solenoid 4e that is in pressure contact with the solenoid. A through hole 4f is formed at the center of the fixed plunger 4b, and a gap (not shown) through which pilot air can pass is formed between the outer peripheral surface of the movable plunger 4c and the inner peripheral surface of the through hole 4a.

[0005] The first switching valve 1 includes a first piston accommodating chamber 1a formed at a lower left portion of a casing 7a and a first piston accommodating chamber 1a.
A first piston 1b accommodated in the piston accommodating chamber 1a so as to be vertically movable, and a first piston 1 in the first piston accommodating chamber 1a.
b and a first air chamber 1c formed above. A first valve body 1d is provided below the first piston 1b. The first valve element 1d is provided with a first switching spring 1e (compression coil spring).
To be seated on the first valve seat 1f. The second switching valve 2 includes a second piston housing chamber 2a formed at the lower center of the casing 7a, a second piston 2b housed in the second piston housing chamber 2a so as to be vertically movable, and a second piston housing chamber. 2a and a second air chamber 2c formed above the second piston 2b. Second
A second valve body 2d is provided below the piston 2b. The second valve body 2d is configured to be pushed up by the second switching spring 2e (compression coil spring) and to be seated on the second valve seat 2f. In addition, the first and second pilot solenoid valves 5,
6 is the same as the supply / discharge pilot solenoid valve 4,
And second solenoids 5a and 6a, respectively. Further, the vehicle height is detected by a vehicle height sensor (not shown). Each detection output of the first pressure sensor, the second pressure sensor, and the vehicle height sensor is connected to a control input of a controller (not shown), and the control output of the controller is a supply / discharge solenoid 4.
e, connected to the first and second solenoids 5a, 6a, respectively.

In the control valve constructed as described above, when a load is loaded on the vehicle and the vehicle height is lowered, the controller controls the supply / discharge solenoid 4e, the first and second solenoids 5a based on the detection output of the vehicle height sensor. , 6a. When the supply / discharge solenoid 4e is energized,
The movable plunger 4c rises due to the electromagnetic force, and the upper surface thereof comes into close contact with the lower surface of the fixed plunger 4b, and the compressed air (pilot air) in the air tank is supplied to the supply / discharge air chamber 3c as indicated by a broken line arrow. Since the discharge piston 3b descends, the supply / discharge valve body 3f is pushed down by the supply / discharge piston 3b and separates from the supply / discharge valve seat 3h. Meanwhile, the first
When power is supplied to the second solenoids 5a and 6a, the compressed air (pilot air) in the air tank is supplied to the first and second air chambers 1c and 2c, respectively, so that the first and second pistons 1b and 2b descend. The first and second valve bodies 1d,
2d is depressed by the first and second pistons 1b, 2b and separates from the first and second valve seats 1f, 2f, respectively.
As a result, the compressed air in the air tank is supplied to the left and right air springs, thereby increasing the vehicle height.

When the vehicle height reaches a predetermined height, the controller stops supplying power to the supply / discharge solenoid 4e and the first and second solenoids 5a, 6a based on the detection output of the vehicle height sensor. When the power supply to the supply / discharge solenoid 4e is stopped,
The movable plunger 4c descends due to the elastic force of the third spring, and the upper surface thereof separates from the lower surface of the fixed plunger 4b. The discharge piston 3b is raised by the elastic force of the first spring 3d, and the supply / discharge valve body 3f is raised by the elastic force of the second spring 3g to be seated on the supply / discharge valve seat 3h. On the other hand, when the energization of the first and second solenoids 5a, 6a is stopped, the pilot air in the first and second air chambers 1c, 2c is discharged into the atmosphere, so that the first and second valve bodies 1d, 2d. Rises together with the first and second pistons 1b and 2b by the elastic force of the first and second switching springs 1e and 2e, and sits on the first and second valve seats 1f and 2f, respectively.
As a result, the air tank and the left and right air springs are shut off.

[0008]

However, in the conventional control valve, since a large concave portion is formed on the upper surface of the supply / discharge piston, the supply / discharge piston is pushed when the first spring pushes up the supply / discharge piston. The capacity of the discharge air chamber is relatively large, and a relatively large amount of pilot air (compressed air) is required to depress the supply / discharge piston, which may delay the operation of the supply / discharge valve. On the other hand, when raising and lowering the supply / discharge piston in order to stop the supply of compressed air to the pneumatic device, the pilot air in the air chamber must be discharged. At this time, there is a problem that a lot of pilot air is exhausted and exhaust noise of the air is loud. An object of the present invention is to supply / discharge a relatively small amount of pilot air (compressed air) to a supply / discharge air chamber, thereby enabling quick switching of a supply / discharge valve, thereby suppressing wasteful consumption of pilot air. An object of the present invention is to provide a control valve for a pneumatic device, which can reduce exhaust noise. Another object of the present invention is to provide a control valve for a pneumatic device that can improve the response of an air spring.

[0009]

The invention according to claim 1 is
As shown in FIGS. 1 and 2, a casing 21 a having a piston accommodating chamber 24 e formed therein, a supply / discharge piston 24 f accommodated in the piston accommodating chamber 24 e so as to be vertically movable and pushed up by the elastic force of an elastic body 24 g, Supply / discharge piston 24
The air supply / discharge air chamber 24d formed above the supply / discharge piston 24f in the piston accommodating chamber 24e in a state where f is pushed up by the elastic body 24g and supplied with pilot air for pushing down the supply / discharge piston 24f. A supply / discharge valve 24 for switching the pneumatic devices 11, 12 to communicate with the air tank 19 or the atmosphere by vertically moving the supply / discharge piston 24f.
And an air supply / discharge pilot solenoid valve 23 connected to the supply / discharge air chamber 24d for supplying pilot air to the supply / discharge air chamber 24d or discharging the pilot air from the supply / discharge air chamber 24d by an electric signal. Improvement of control valve for pressure equipment. The characteristic configuration is the supply / discharge piston 2
A projection 2 is formed on the top surface of 4f so as to narrow the supply / discharge air chamber 24d.
4h is provided. In the control valve for a pneumatic device according to the first aspect, the supply / discharge piston 24f is lowered only by supplying a relatively small amount of pilot air (compressed air) to the supply / discharge air chamber 24d.
Since the consumption of pilot air in the air tank 19 can be reduced, and the amount of pilot air discharged from the supply / discharge air chamber 24d is relatively small, the exhaust noise can be reduced.

The invention according to claim 2 is the invention according to claim 1, and further includes, as shown in FIG.
2 is an air spring provided between the wheels 13 and 14 and the chassis frame 16 to support the chassis frame 16. In the control valve for a pneumatic device according to the second aspect, the supply / discharge piston 24f moves up and down only by supplying / discharging a relatively small amount of pilot air to / from the supply / discharge air chamber 24d. , 12
Responsiveness is improved, and vehicle height adjustment can be performed smoothly.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. As shown in FIG. 2, in this embodiment, the pneumatic devices 11 and 12 are left and right air springs provided between the wheels 13 and 14 of the automobile and the chassis frame 16, respectively. 12 supports the chassis frame 16. The vehicle height adjusting device 17 for adjusting the vehicle height of the automobile includes the air springs 11 and 12 and the air passages 1 through which the compressed air is stored.
An air tank 19 is connected through the air passage 8 and a control valve 21 provided in the air passage 18 for switching the supply and discharge of compressed air to and from the air springs 11 and 12. The first and second chassis frames 16 extend in the traveling direction of the vehicle.
It has side members 16a and 16b, and a cross member 16c extending in the vehicle width direction and having both ends bridged between the first and second side members 16a and 16b. Also left and right wheels 1
The axles 3 and 14 are fixed to both ends of an axle (not shown), and the axle is rotatably held by an axle housing 22. The left air spring 11 is interposed between the axle housing 22 and the first side member 16a, and the right air spring 12 is interposed between the axle housing 22 and the second side member 16b.

As shown in FIGS. 1 and 2, the control valve 21 supplies and discharges pilot air with a supply / discharge pilot solenoid valve 23 to thereby control the left and right air springs 11 and 12.
And a supply / discharge valve 24 for switching the air supply to the air tank 19 or the atmosphere, and a first pilot solenoid valve 31 for supplying / discharging the pilot air to connect / disconnect the left air spring 11 to / from the supply / discharge valve 24. 1 switching valve 41
By supplying and exhausting pilot air with the second pilot solenoid valve 32, the right air spring 12 and the supply and exhaust valve 24
And a second switching valve 42 for communicating or shutting off.

As shown in FIG. 2, the supply / discharge valve 24 is a three-port, two-position switching spring return type air valve. The first port 24a is connected to the air tank 19 through the main supply passage 26, and the second port 24a is connected to the second tank. Port 24b is the first
Left and right air springs 1 through the second branch passages 51 and 52
The exhaust ports 24c are connected to the exhaust ports 1 and 12, respectively, and are opened to the atmosphere through the main exhaust passage 27. The first and second switching valves 41 and 42 are two-port two-position switching spring return type air valves, and are provided in the first and second branch passages 51 and 52, respectively. The first port 41a of the first switching valve 41 is connected to the second port 24b of the supply / discharge valve 24, and the second port 41b is connected to the air spring 11 on the left side. Also, the second switching valve 42
The first port 42a is connected to the second port 24 of the supply / discharge valve 24.
b, and the second port 42b is connected to the right air spring 12.

The supply / discharge pilot solenoid valve 23, the first and second pilot solenoid valves 31, 32 are spring return type solenoid valves that switch between three ports and two positions. The first port 23a of the supply / discharge pilot solenoid valve 23 is connected to the branch supply passage 28.
The second port 23b is connected to the supply / discharge air chamber 24d (FIG. 1) of the supply / discharge valve 24 through the supply / discharge passage 29, and is connected to the exhaust port 24c through the main supply passage 26 and the air tank 19. Is opened to the atmosphere through the branch exhaust passage 33 and the main exhaust passage 27. The first port 31 a of the first pilot solenoid valve 31 is connected to the air tank 19 through the branch supply passage 28 and the main supply passage 26, and the second port 31 b is connected to the first switching valve 41 through the first switching passage 61. Is connected to the first air chamber 41c (FIG. 1),
The exhaust port 31c is connected to the branch exhaust passage 33 and the main exhaust passage 2
7 and open to the atmosphere. 2nd pilot solenoid valve 3
The second first port 32a is connected to the air tank 19 through the branch supply passage 28 and the main supply passage 26, and the second port 32b is passed through the second switching passage 62 and the second air chamber 42c of the second switching valve 42. (FIG. 1), and the exhaust port 32c is opened to the atmosphere through the branch exhaust passage 33 and the main exhaust passage 27.

As shown in FIG. 1, the supply / discharge valve 24, the first
The switching valve 41, the second switching valve 42, the supply / discharge pilot solenoid valve 23, the first pilot solenoid valve 31, and the second pilot solenoid valve 32 are integrally formed in the casing 21a. The supply / discharge valve 24 includes a piston accommodating chamber 24e formed at a lower right portion of the casing 21a, and a supply / discharge piston 2 accommodated in the piston accommodating chamber 24e so as to be vertically movable.
4f, a piston 24f for supplying and discharging the piston accommodating chamber 24e
And a supply / discharge air chamber 24d formed above. The supply / discharge piston 24f is a first spring 24g (compression coil spring).
The supply / discharge air chamber 24d is configured to be supplied with pilot air by the supply / discharge pilot solenoid valve 23 in a state where the supply / discharge piston 24f is pushed up by the first spring 24g. Is done. A projection 24h is provided on the top surface of the supply / discharge piston 24f so as to narrow the supply / discharge air chamber 24d, and a supply / discharge valve body 24i is provided below the supply / discharge piston 24f. The supply / discharge valve body 24i is configured to be pushed up by a second spring 24j (compression coil spring) and to be seated on the supply / discharge valve seat 24k.

The supply / discharge pilot solenoid valve 23 has a supply / discharge through-hole 23d extending vertically in the upper right part of the casing 21a, and a fixed plunger 23e inserted in the upper part of the through-hole 23d so as not to be vertically movable. A movable plunger 23f vertically movably inserted into a lower portion of the through hole 23d, a third spring (compression coil spring: not shown) for urging the movable plunger 23f away from the fixed plunger 23e,
And a supply / discharge solenoid 23h which is provided around the through hole 23d and raises the movable plunger 23f when energized to press against the fixed plunger 23e. Fixed plunger 2
A through hole 23i is formed at the center of 3e, and a gap (not shown) through which pilot air can pass is formed between the outer peripheral surface of the movable plunger 23f and the inner peripheral surface of the through hole 23d.

The first switching valve 41 includes a first piston housing chamber 41d formed at the lower left portion of the casing 21a, a first piston 41e housed vertically in the first piston housing chamber 41d, and a first piston housing 41d. A first air chamber 41c formed above the first piston 41e of the accommodation chamber 41d. A first valve body 41 is provided below the first piston 41e.
f is provided. The first valve body 41f is configured to be pushed up by a first switching spring 41g (compression coil spring) and to be seated on the first valve seat 41h. The second switching valve 42 includes a second piston housing chamber 42d formed at a lower center portion of the casing 21a and a second piston housing chamber 4d.
A second piston 42e housed in the 2d so as to be vertically movable;
A second air chamber 42c formed above the second piston 42e in the second piston housing chamber 42d. A second valve body 42f is provided below the second piston 42e. The second valve body 42f is configured to be pushed up by a second switching spring 42g (compression coil spring) and to be seated on the second valve seat 42h. In addition, the first and second pilot solenoid valves 3
Reference numerals 1 and 32 have the same configuration as the supply / discharge pilot solenoid valve 23, and have first and second solenoids 31d and 32d, respectively.

On the other hand, first and second pressure sensors 71 and 72 are provided in the first and second branch passages 51 and 52, and the left and right air springs 11 and 72 are provided by these pressure sensors 71 and 72.
It is configured to detect the pressure of the compressed air in the respective sections 12. Left and right vehicle height sensors 36 and 37 are attached to the cross member 16c. Left and right vehicle height sensors 36, 3
Reference numeral 7 denotes a non-contact type potentiometer in this embodiment, which is configured to be the same on the left and right. These vehicle height sensors 36, 37 have sensor main bodies 36a, 37a attached to the cross member 16c and base ends of the sensor main bodies 36a, 37a.
and levers 36b and 37b pivotally attached to a, and links 36c and 37c whose upper ends are pivotally attached to the distal ends of the levers 36b and 37b and whose lower ends are pivotally attached to the axle housing 22. These vehicle height sensors 36, 37 are connected to levers 36b, 3
When the tip of 7b is directed obliquely upward, it is electrically detected that the vehicle height is lower than the reference value, and when it is diagonally downward, it is electrically detected that the vehicle height is higher than the reference value. It is composed of The detection outputs of the first pressure sensor 71, the second pressure sensor 72, and the left and right vehicle height sensors 36, 37 are connected to the control input of the controller 38, and the control output of the controller 38 is the supply / discharge solenoid 23h,
And the second solenoids 31d and 32d.

The operation of the control valve thus configured will be described. When the vehicle height is lowered by loading the load on the vehicle, the controller 38 supplies current to the supply / discharge solenoid 23h and the first and second solenoids 31d and 32d based on the detection outputs of the vehicle height sensors 36 and 37, respectively.
When the supply / discharge solenoid 23h is energized, the movable plunger 23f rises due to its electromagnetic force, and its upper surface comes into close contact with the lower surface of the fixed plunger 23e, and the compressed air (pilot air) in the air tank 19 is indicated by a broken line arrow in FIG. As described above, the main supply passage 26, the branch supply passage 28, and the supply / discharge passage 2
9, the air is supplied to the supply / discharge air chamber 24d. At this time, the volume of the supply / discharge air chamber 24d is extremely small due to the presence of the projection 24h. Valve body 24i is supplied / discharged piston 24f
The first port 24a (FIG. 2) of the supply / discharge valve 24 and the second port 2
4b (FIG. 2).

On the other hand, the first and second solenoids 31d, 3d
When the power is supplied to the second, the compressed air (pilot air) in the air tank 19 is supplied to the first and second air chambers 41c and 42c, respectively. At this time, the first and second air chambers 41c,
Since the volume of 42c is only slightly larger than the supply / discharge air chamber 24d, only a relatively small amount of pilot air is supplied / discharged to the first and second air chambers 41c and 42c, and the first and second pistons 41e are provided. , 42e descends quickly, and the first and second valve bodies 41f, 42f move the first and second pistons 41f, 42f.
e, 42e to push down the first and second valve seats 41.
h, 42h. Thus, the first port 41a and the second port 41b of the first switching valve 41 communicate with each other, and the first port 42a and the second port 42b of the second switching valve 42 communicate with each other. As a result, the compressed air in the air tank 19 is quickly supplied to the left and right air springs 11 and 12 to increase the vehicle height, so that the vehicle height can be adjusted smoothly.

When the vehicle height reaches the reference value, the controller 3
Reference numeral 8 denotes a supply / discharge solenoid 23h, first and second solenoids 31d, based on the detection outputs of the vehicle height sensors 36 and 37.
The energization to 32d is stopped. When the supply of electricity to the supply / discharge solenoid 23h is stopped, the movable plunger 23f is lowered by the elastic force of the third spring, and the upper surface thereof is fixed.
e, the pilot air in the supply / discharge air chamber 24d is supplied from the branch supply passage 28, as shown by the solid line arrow in FIG.
The air is discharged into the atmosphere through the gap on the outer peripheral surface of the movable plunger 23f, the through hole 23i, the branch exhaust passage 33, and the main exhaust passage 27. At this time, the amount of pilot air discharged from the supply / discharge air chamber 24d is small. On the other hand, when the power supply to the first and second solenoids 31d and 32d is stopped, the pilot air in the first and second air chambers 41c and 42c is discharged into the atmosphere. At this time, the first and second air chambers 41c, 42
The amount of pilot air in c is only slightly larger than the amount of pilot air in the supply / discharge air chamber 24d, and is relatively small. As a result, since the total amount of pilot air exhausted from the main exhaust passage 27 is relatively small, the exhaust noise is small.

When the pilot air in the supply / discharge air chamber 24d is discharged into the atmosphere, the supply / discharge piston 24f rises due to the elastic force of the first spring 24g, and the supply / discharge valve 24i.
Rises due to the elastic force of the second spring 24j and sits on the supply / discharge valve seat 24k. Also, the first and second air chambers 41c, 4
When the pilot air of 2c is discharged into the atmosphere, the first and second valve bodies 41f and 42f move to the first and second pistons 41f.
e, 42e and first and second switching springs 41g, 4g.
The first and second valve seats 41h,
Each seats at 42h. Therefore, the air tank 19 and the left and right air springs 11 and 12 are shut off.

[0023]

As described above, according to the present invention, the projection is provided on the top surface of the supply / discharge piston of the supply / discharge valve so as to narrow the supply / discharge air chamber to which the pilot air is supplied / discharged. Therefore, only by supplying / discharging a relatively small amount of pilot air to the supply / discharge air chamber, the supply / discharge piston moves up and down, and the supply / discharge valve is quickly switched. As a result, unnecessary consumption of pilot air can be suppressed, and exhaust noise can be reduced. If the pneumatic device is an air spring provided between the wheel and the chassis frame and supporting the chassis frame, the responsiveness of the air spring is improved, so that the vehicle height can be adjusted smoothly.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a control valve for a pneumatic device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a vehicle height adjusting device including the control valve.

FIG. 3 is a longitudinal sectional view showing a conventional example and corresponding to FIG.

[Explanation of symbols]

 11, 12 Air spring (pneumatic device) 13, 14 Wheel 16 Chassis frame 19 Air tank 21 Control valve 21a Casing 23 Supply / discharge pilot solenoid valve 24 Supply / discharge valve 24d Supply / discharge air chamber 24e Piston storage chamber 24f Supply / discharge piston 24g First spring (elastic body) 24h Projection

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D001 AA00 AA08 AA19 BA05 DA02 DA17 DA19 EA01 EA04 EB17 3H056 AA01 BB02 BB49 BB50 CA03 CB03 CC12 CD04 CD06 DD10 GG11 GG12

Claims (2)

[Claims] 1. A casing (21a) having a piston accommodating chamber (24e) formed therein, and a supply / discharge unit accommodated in the piston accommodating chamber (24e) so as to be vertically movable and pushed up by the elastic force of an elastic body (24g). The piston (24f) and the supply / discharge piston (24f) are formed above the supply / discharge piston (24f) in the piston housing chamber (24e) in a state where the piston is pushed up by the elastic body (24g). A supply / discharge air chamber (24d) to which pilot air for pushing down the discharge piston (24f) is supplied, and a pneumatic device (11, 12) by the vertical movement of the supply / discharge piston (24f). A supply / discharge valve (24) for switching the pilot air to communicate with the air tank (19) or the atmosphere; and connecting the pilot air to the supply / discharge air chamber (24d) by an electric signal connected to the supply / discharge air chamber (24d). A pneumatic device comprising a supply / discharge pilot solenoid valve (23) for supplying or discharging the pilot air from the supply / discharge air chamber (24d). Pneumatic dexterity control valve, characterized in that the projections (24h) is provided so as to narrow the supply and discharge air chamber on the top surface of the supply and discharge piston (24f) and (24d); in the control valve. 2. The pneumatic device (11, 12) is an air spring provided between the wheels (13, 14) and the chassis frame (16) to support the chassis frame (16). Control valve for pneumatic equipment.