Relay valve, valve device, and vehicle associated therewith

1. A relay valve for a compressed air system, comprising:

a housing comprising

a pressure medium input configured to be connected to a pressure medium source,

at least one pressure medium output configured to be connected to a consumer,

at least one control input, and

at least one purge ( 32 ) leading to atmosphere,

a relay valve piston ( 14 ) which is arranged in the housing displaceably along a relay valve piston axis ( 16 ),

a first sealing element ( 54 ) for sealing the relay valve piston ( 14 ) against the housing, wherein the first sealing element ( 54 ) is fixed to the housing,

a second sealing element ( 56 ) for sealing the relay valve piston ( 14 ) against the housing, wherein the second sealing element ( 56 ) is fixedly arranged on the relay valve piston ( 14 ),

an annular chamber ( 58 ) which is delimited by the first sealing element ( 54 ), the second sealing element ( 56 ), the relay valve piston ( 14 ) and the housing, and

a connection of the annular chamber ( 58 ) to the atmosphere,

wherein a part of a control chamber ( 22 ) connected to the control input is separated off as a damping volume ( 68 ), the control chamber ( 22 ) and the damping volume ( 68 ) being connected together via a choke ( 72 ), wherein the damping volume ( 68 ) is separated from the control chamber ( 22 ) via a diaphragm ( 70 ), and an opening in the diaphragm acts as the choke ( 72 ).

2. The relay valve as claimed in claim 1 , wherein the housing has a two-part configuration with a first housing part ( 4 ) and a second housing part ( 6 ), wherein the second housing part ( 6 ) is constructed as a flat cover which is sealingly connected to the first housing part ( 4 ).

3. The relay valve as claimed in claim 1 , wherein the connection of the annular chamber ( 58 ) to atmosphere includes an axial bore ( 62 ) in the relay valve piston ( 14 ), the axial bore ( 62 ) leading into a purge chamber ( 30 ), and

a channel ( 60 ) in the relay valve piston ( 14 ) which is configured to connect the axial bore ( 62 ) to the annular chamber ( 58 ).

4. The relay valve as claimed in claim 1 , wherein the annular chamber ( 58 ) has a size adapted to establish a predefined ratio of a pressure present at the pressure medium output to a control pressure present at the control input.

5. The relay valve as claimed in claim 4 , wherein the predefined ratio is a 1:1 ratio.

6. A relay valve for a compressed air system, comprising:

a housing comprising

a pressure medium input configured to be connected to a pressure medium source,

at least one pressure medium output configured to be connected to a consumer,

at least one control input, and

at least one purge ( 32 ) leading to atmosphere,

a relay valve piston ( 14 ) which is arranged in the housing displaceably along a relay valve piston axis ( 16 ),

a first sealing element ( 54 ) for sealing the relay valve piston ( 14 ) against the housing, wherein the first sealing element ( 54 ) is fixed to the housing,

a second sealing element ( 56 ) for sealing the relay valve piston ( 14 ) against the housing, wherein the second sealing element ( 56 ) is fixedly arranged on the relay valve piston ( 14 ),

an annular chamber ( 58 ) which is delimited by the first sealing element ( 54 ), the second sealing element ( 56 ), the relay valve piston ( 14 ) and the housing, and a connection of the annular chamber ( 58 ) to the atmosphere,

wherein a damping volume ( 76 ) is arranged in the relay valve piston ( 14 ), wherein the damping volume ( 76 ) and a control chamber ( 22 ) connected to the control input are connected together via a choke ( 78 ).

7. The relay valve as claimed in claim 6 , wherein the housing has a two-part configuration with a first housing part ( 4 ) and a second housing part ( 6 ), wherein the second housing part ( 6 ) is constructed as a flat cover which is sealingly connected to the first housing part ( 4 ).

8. The relay valve as claimed in claim 6 , wherein the connection of the annular chamber ( 58 ) to atmosphere includes an axial bore ( 62 ) in the relay valve piston ( 14 ), the axial bore ( 62 ) leading into a purge chamber ( 30 ), and

a channel ( 60 ) in the relay valve piston ( 14 ) which is configured to connect the axial bore ( 62 ) to the annular chamber ( 58 ).

9. The relay valve as claimed in claim 6 , wherein the annular chamber ( 58 ) has a size adapted to establish a predefined ratio of a pressure present at the pressure medium output to a control pressure present at the control input.

10. The relay valve as claimed in claim 9 , wherein the predefined ratio is a 1:1 ratio.

11. A valve arrangement for a compressed air system, comprising two relay valves, one of which is the relay valve according to claim 1 .

12. The valve arrangement as claimed in claim 11 , wherein the two relay valves ( 2 ) are arranged in a valve block, wherein the two relay valves ( 2 ) are connected via a common purge chamber ( 30 ).

13. A vehicle comprising at least two relay valves, one of which is the relay valve according to claim 1 .

14. A valve arrangement for a compressed air system, comprising two relay valves, one of which is the relay valve according to claim 6 .

15. The valve arrangement as claimed in claim 14 , wherein the two relay valves ( 2 ) are arranged in a valve block, wherein the two relay valves ( 2 ) are connected via a common purge chamber ( 30 ).

16. A vehicle comprising at least two relay valves, one of which is the relay valve according to claim 6 .