Installation

The pressure limiting valve can be installed either directly flanged on the relay emergency valve (using a sealing ring Part No, 025 0021 09) or installed in the line between the relay emergency valve and brake cylinder.

Care must be taken to ensure the lever is adequately accessible. The vent must face downwards.

lt is recommended to install a pressure limiting valve for each axle or axle pair if the front and rear axle(s) of the trailer are subjected to different loads during operation. Each pressure limiting valve then limits the brake pressure in the corresponding
axle independently of the other. The allocation of the pressure limiting valve should be indicated by means of an information plate.

The pressure limiting valve must be maintained as part of the legal regulations. Renew damaged dust caps. Pressure setting of manual load valve. Depending on the version, the pressure setting of the pressure limiting valve can be adjusted for the settings “no load”, “1/4 load” or “1/2 load” by turning the adjusting screws. lt is not possible to adjust the pressure for the “full load” setting.

A screwdriver DIN 911-4 (key for socket head cap screws 4 mm) is required for adjustment work. The lever position for adjusting the pressure in “no load”, “1/2 load”, “1/4 load” and “3/4 load” settings is specified in the following.

Turning the adjusting screw in a clockwise direction = pressure reduction
Turning the adjusting screw in a counterclockwise direction = pressure increase
The pressure value to be adjusted depends on the specifications of the vehicle manufacturer.

Testing

Check pressure setting in the individual lever positions (note specifications of vehicle manufacturer). For reference values, refer to types or information on carrying out special brake inspections. Check release position (if available). The brakes must be free in the “release” position. Check the dust cap.