Wabco Fahrzeugbremsen Gmbh

Wabco Westinghouse Fahrzeugbremsen Gmbh

Heinz-Werner Konig

Karl-Heinz Deike

Bernd-Joachim Kiel

Klaus-Dieter Bergemann

Gerhard Fauck

Bernd Kiel

The present invention provides a pressure regulating valve which substantially avoids shutoff noises. The pressure regulating valve is designed such that the opening process of the shutoff valve proceeds in two steps. The two-step switching process is made possible by the provision of a seal ring which slides on an activating piston which activates the shutoff valve. This seal ring acts upon a housing mounted detent and an activating piston mounted additional detent, thus creating an automatically acting additional surface area for the activating piston. This design also makes it possible to increase the safety function of the pressure regulating valve, by increasing the pressure medium activated surface area of the valve body for the shutoff valve without incurring higher work forces at the activating piston.

Pressure regulating valve

The invention relates to a pneumatic relay valve for regulating output pressure in proportion to a control pressure. The relay valve includes a first piston member which is acted on by the control pressure and a second piston member which is acted on by the input pressure. A compression spring is located between the two relay piston members. The strength of the compression spring determines the height of a predetermined minimum controlled pressure even if the input pressure is subsequently lost or drops to a low value. In addition, the output pressure of a receiver can be maintained at a specific adjustable level which may be below the maximum pressure value of the input pressure due to the compression spring located between the two relay piston members.

Pneumatic relay valve

This invention relates to a control system for a pneumatically cushioned vehicle having at least a first and a second pneumatically cushioned axle. The pressure in the air spring bellows of the second axle is controlled in accordance with the air spring bellows of the first axle. The air spring bellows of the second axle are connected to a source of supply pressure by a pneumatic relay valve. The relay valve includes a control inlet which is connected with the air spring bellows of the first axle. The relay valve is designed in such a way, that if no pressure or a relatively low control pressure is present at the control inlet, the pressure at an outlet port of the relay valve leading to the air spring bellows of the second axle will be maintained at a minimum value. The relay valve includes a first control chamber and a second control chamber which are separated by a relay piston. The piston of the relay valve is biased by a compression spring which establishes a predetermined level of the pressure initially entering the air spring bellows of the second axle in the event of subsequent pressure loss.

Control arrangement for a pneumatically cushioned vehicle

In a variable load valve device of the type employing a walking beam type lever arrangement via which the control and compensating pistons are interconnected to obtain proportional control of the brake pressure, there is provided an externally accessible screw adjustment for varying the tension of a bias spring acting on one of the levers, whereby the proportional brake control is withheld until a predetermined level of brake pressure is achieved corresponding to the spring bias.

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Barsinghausen, Germany

Heinz-Werner Konig