Control valve for automatic compressed-air brakes having a special valve housing

Patent metadata

Field	Value
Publication number	US-10399549-B2
Application number	US-201515509039-A
Country	US
Kind code	B2
Filing date	Aug 21, 2015
Priority date	Sep 4, 2014
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

A control valve for automatic compressed-air brakes forms a brake cylinder pressure in at least one connected brake cylinder in accordance with a pressure difference between a pressure in a continuous main air line of a train and a stored reference pressure, which is drawn from the pressure of the main air line, comprising valve means for drawing a control pressure from the pressure of the main air line in order to produce a brake cylinder pressure for applying to the brake cylinder. A first piston system provides the control pressure from the pressure of the main air line and a valve mechanism for producing the brake cylinder pressure, wherein a short-stroke first piston system actuates the accelerating element in the same valve housing interacts with a second piston system for actuating the valve mechanism, the second piston system being of longer stroke in relation to the first piston system.

First claim

The invention claimed is:

1. A control valve for automatic air brakes for forming a brake cylinder pressure in at least one connected brake cylinder according to a pressure difference between a pressure in a continuous main air line of a train and a stored reference pressure which is derived from the pressure of the main air line, the control valve comprising:
valve structure for deriving a control pressure from the pressure of the main air line to generate a brake cylinder pressure for loading the brake cylinder, wherein the valve structure includes a short-stroke first piston system for providing the control pressure from the pressure of the main air line and a valve mechanism for generating the brake cylinder pressure;
an acceleration member actuated by the short-stroke first piston system; and
a second piston system for actuating the valve mechanism,
wherein the acceleration member interacts in a common valve housing as the second piston system for actuating the valve mechanism, and
wherein the second piston system has a longer stroke relative to the short-stroke first piston system,
wherein the acceleration member comprises a venting valve and, wherein an actuated switching position which brings about a braking operation, additionally vents the main air line to bring about signal boosting.

2. The control valve of claim 1 , wherein the piston stroke of the second piston system corresponds to, from 1.5 to 3 times, the piston stroke of the short-stroke first piston system.

3. The control valve of claim 1 , wherein the acceleration member comprises a spring-loaded check valve.

4. The control valve of claim 1 , wherein the short-stroke first piston system comprises a control piston which actuates a venting valve via a piston rod.

5. The control valve of claim 1 , wherein the second piston system comprises a control piston which actuates the valve mechanism via a piston rod.

6. A control valve for automatic air brakes for forming a brake cylinder pressure in at least one connected brake cylinder according to a pressure difference between a pressure in a continuous main air line of a train and a stored reference pressure which is derived from the pressure of the main air line, the control valve comprising:
valve structure for deriving a control pressure from the pressure of the main air line to generate a brake cylinder pressure for loading the brake cylinder, wherein the valve structure includes a short-stroke first piston system for providing the control pressure from the pressure of the main air line and a valve mechanism for generating the brake cylinder pressure;
an acceleration member actuated by the short-stroke first piston system; and
a second piston system for actuating the valve mechanism,
wherein the acceleration member interacts in a common valve housing as the second piston system for actuating the valve mechanism, and
wherein the second piston system has a longer stroke relative to the short-stroke first piston system,
wherein the valve mechanism is a double seat valve and, wherein an actuated switching position which brings about a braking operation, loads the brake cylinder with a supply pressure which comes from a supply air reservoir.

7. The control valve of claim 6 , wherein the piston stroke of the second piston system corresponds to, from 1.5 to 3 times, the piston stroke of the short-stroke first piston system.

8. The control valve of claim 6 , wherein the acceleration member comprises a spring-loaded check valve.

9. The control valve of claim 6 , wherein the short-stroke first piston system comprises a control piston which actuates a venting valve via a piston rod.

10. The control valve of claim 6 , wherein the second piston system comprises a control piston which actuates the valve mechanism via a piston rod.

11. A control valve for automatic air brakes for forming a brake cylinder pressure in at least one connected brake cylinder according to a pressure difference between a pressure in a continuous main air line of a train and a stored reference pressure which is derived from the pressure of the main air line, the control valve comprising:
valve structure for deriving a control pressure from the pressure of the main air line to generate a brake cylinder pressure for loading the brake cylinder, wherein the valve structure includes a short-stroke first piston system for providing the control pressure from the pressure of the main air line and a valve mechanism for generating the brake cylinder pressure;
an acceleration member actuated by the short-stroke first piston system; and
a second piston system for actuating the valve mechanism,
wherein the acceleration member interacts in a common valve housing as the second piston system for actuating the valve mechanism, and
wherein the second piston system has a longer stroke relative to the short-stroke first piston system,
wherein the common valve housing is attached releasably to a valve support which provides compressed air connections.

12. The control valve of claim 11 , wherein the piston stroke of the second piston system corresponds to, from 1.5 to 3 times, the piston stroke of the short-stroke first piston system.

13. The control valve of claim 11 , wherein the acceleration member comprises a spring-loaded check valve.

14. The control valve of claim 11 , wherein the short-stroke first piston system comprises a control piston which actuates a venting valve via a piston rod.

15. The control valve of claim 11 , wherein the second piston system comprises a control piston which actuates the valve mechanism via a piston rod.

Assignees

• Knorr Bremse Systeme

Inventors

• Lund Karsten

Classifications

• B60T15/302

  Railway control or brake valves with evacuation of air to a reservoir, to the atmosphere or to the brake cylinder · CPC title

• B60T15/188

  with a slide valve for initiation and annular valves for control of the braking · CPC title

• B60T15/306

  with a slide valve for initiation and a second slide valve for control of the braking · CPC title

• B60T15/184

  Railway control or brake valves · CPC title

• B60T15/187

  with a slide valve for initiation and a second slide valve for control of the braking · CPC title