DATA PD BR43.. Load Sensing Valve - mechanically controlled. Product. Function. Technical Features. Range Overview

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Daniella Franklin
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Commercial Vehicle Systems Product DATA BR.. Doc. No. Y0 (EN - Rev.

The mechanical suspension Load Sensing Valve uses the movement between the vehicle s chassis and axle to sense the load imposed on the axles.

Any movement of the chassis changes the position of the valve s control arm which, in turn, alters the ratio of input pressure to output pressure.

The relay emergency feature provides automatic braking on a trailer in the event of a breakaway. A static valve uses the braking ratio at commencement of braking throughout the brake application.

1 Commercial Vehicle Systems Product DATA BR.. Doc. No. Y0 (EN - Rev. 00) May 0 PD Function The Load Sensing Valve is used to adjust the applied service brake pressure in relation to the load imposed on the vehicle s axles. The mechanical suspension Load Sensing Valve uses the movement between the vehicle s chassis and axle to sense the load imposed on the axles. The valve is installed on the chassis and a linkage is required to connect the control arm of the valve to the axles. Any movement of the chassis changes the position of the valve s control arm which, in turn, alters the ratio of input pressure to output pressure. BR Versions of the Load Sensing Valve are available with standard relay or relay emergency feature and with static or dynamic operation. The relay emergency feature provides automatic braking on a trailer in the event of a breakaway. A static valve uses the braking ratio at commencement of braking throughout the brake application. A dynamic valve adjusts the braking ratio throughout the brake application to counteract the effect of axle load change due to load transfer. To adjust the rate of change of control ratio due to change in axle load, the effective length of the lever can be adjusted. A vehicle data plate showing the setting of the Load Sensing Valve is required by law. Technical Features Maximum Operating Pressure:. bar Operating Temperature Range: -0 C to +0 C Working Angle: 0 Weight:. kg approx. Range Overview Part No. Type No. Operation Type Relay Emergency Valve Relay Function K0790 ) BR dynamic with with SEB009 BR70 static without without Part No. Type No. Port Threads Remark with rigid link with cable link - K0790 ) BR Mx. Mx. Mx. (x) Mx. (x) - Mx. SEB009 BR70 Mx. - Mx. (x) - - Other versions are available. Maximum adjustable lever length: 00 mm. ) The part number will carry a suffix N00 which defines that it is supplied without packaging. BR BR70 BR70 Standard Symbol as DIN ISO 9 - BR BR 70 Service Parts: Lever with Rubber Links for BR: SEB00 Lever with Cable Link for BR70: SEB0 Accessories: Tandem Axle Linkage K00 ) Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

2 PD BR.. Product Data Doc. No. Y0 (EN - Rev. 00) May 0 Functional Diagrams Control ratio / / max. a=0 a=0 7 Delivery Pressure vs Angle p = 7. bar (BR) p = 7. bar (BR70) 7 Automatic braking (only BR) A = Pressure in the Supply Line [bar] = Pressure in the Brake Actuators [bar] = Signal pressure p (BR), p (BR70) [bar] = Delivery pressure p [bar] = Lever deflection α [º] = Delivery pressure p [bar] A = Initial charging 0 7 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

3 Commercial Vehicle Systems Doc. No. Y0 (EN - Rev. 00) May 0 BR.. PD Dimensions BR - K0790. Limitation STOP 0 9 Mx. 7. Overtravel 0 + M.. - Mx. Mx Mx. - Mx M M Working angle 0 0 STOP 7 ) ) Ø Ports: = Supply (from Red Trailer Coupling) - = Trailer Service Brake Reservoir = Delivery (to Brake Actuator) = Exhaust = Signal (from Yellow Trailer Coupling) ) Tightening torque 0± Nm. M = Required adjusting torque: Nm M = Permissible adjusting torque: 0 Nm ) maximum Mounting Plate Dimension Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

4 0 PD BR.. Product Data Doc. No. Y0 (EN - Rev. 00) May 0 BR70 - SEB009 R0 STOP 0 Mx. 7 M Overtravel 0. Working angle ) STOP 7 ) x Mx. M M a+ a- a=0 M0 00 max. 00 Tightening torque 0 Nm 7 ) Ports: = Signal (from Foot Valve on trucks and tractors) (from yellow Trailer Coupling on trailers) = Delivery to Brake Actuators = Exhaust M = Required adjusting torque: Nm M = Permissible adjusting torque: 0 Nm Tightening torque Nm ) maximum Mounting Plate Dimension Load Sensing Valve Data Plate Vorderachse, Front Axle, Essieu avant Feder-Nr Spring No Ressort No Ventile Nr Valves No Valves No KNORR- BREMSE AG l S Achslast Axle Load Charge essieu kg l= mm Ausgangsdruck Output Pressure Pression de sortie bar Automatisch-Lastabhängige Bremskraftregeleinrichtung (ALB) für Typ: Load Sensing Device for Type: Dispositif de correction automatique de frainage pour type: Eingangsdruck Input Pressure Pression de entrée Weg s am Hebel Stroke s at Lever Course s ou Levier mm Hinterachse, Rear Axle, Essieu arrière Feder-Nr Spring No Ressort No Ventile Nr Valves No Valves No Achslast Axle Load Charge essieu kg bar Ausgangsdruck Output Pressure Pression de sortie bar l S l= Weg s am Hebel Stroke s at Lever Course s ou Levier mm mm DIN 77-C for mechanically controlled suspension, BR..: Part No.: EB09 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

5 Commercial Vehicle Systems Doc. No. Y0 (EN - Rev. 00) May 0 BR.. PD Determining the Lever Length l - graphical method Lever Length Diagram for mechanical Control Load Sensing Valves: BR, BR Lever Length "l" [mm] Valve Ratio-determined from Brake calculation i ) Example: for an Axle Spring Deflection of 0 mm and a Valve Ratio of : the required Lever Length is mm Axle Spring Deflection "s" [mm] ) i = p - 0. p unladen - 0. Important Note: The graphical method should only be used when the ratio for the laden trailer is :. If the ratio for the laden trailer is not :, use the arithmetic method or contact your Knorr-Bremse representative for guidance. Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

6 PD BR.. Product Data Doc. No. Y0 (EN - Rev. 00) May 0 Determining the Lever Length l - arithmetic method Axle Spring Deflection: s [mm] = Foot Valve delivery pressure on trucks and tractors Control (Yellow) Line pressure on trailers - input: p [bar] = Load dependent brake actuator pressure - unladen: p unladen [bar] = Load dependent brake actuator pressure - laden: p laden [bar] = Valve Ratio (unladen): i L = p unladen - 0. = p - 0. Valve Ratio (laden): i V = p laden - 0. = p - 0. Secondary variable A [angle degree]: A =. x i L -. = Secondary variable B [angle degree]: B =. x i V -. = Secondary variable C: C = sin (A) - sin (B) = Lever Length l [mm]: l = Axle Spring Deflection s = Secondary variable C A computer calculation program is available on request. Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

7 Commercial Vehicle Systems Doc. No. Y0 (EN - Rev. 00) May 0 BR.. PD How to adjust a mechanically controlled Load Sensing Valve BR.. Determine the lever length with the help of the brake calculation, the nomogram and the formula. Fit the Cable attachment on the lever at this length. Write the following data on the Load Sensing Valve Data Plate: input pressure; output pressure of the Load Sensing Valve, unladen and laden, axle load, unladen and laden; lever length and spring deflection. With the lever of the Load Sensing Valve horizontal, the connecting link should be at right angles to it. The length of the link can be adjusted using the clamp screw. Ensure that the vehicle is on level ground and chock the wheels. Axle weight must be according to the data of the axle manufacturer for an unladen vehicle. Check that sufficient service pressure is available. Connect pressure gauges to the control input of the Load Sensing Valve and to the output (Brake Actuators). Apply input pressure as stated on the Data Plate. Read the output pressure on the gauge and correct if necessary (shorten the link to give lower unladen brake pressure and vice versa). See Attention note below. Disconnect the cable and with reference to a suitable measuring device, raise the lever a distance s, i.e. the distance of spring deflection as taken from the data plate. Apply input pressure as stated on the Data Plate. Read the output pressure and check it is the same as the Laden pressure as defined on the data plate. If it is not then correct by adjusting the lever length (shorten to increase output pressure and vice versa). Check and adjust until both unladen (with cable fitted) and laden settings are correct. See Attention note below. After finishing the test ensure that the lever and cable clamps are tightened securely. Attention: To adjust valve BR70 with static characteristic the supply pressure must be released to make any adjustment and then the output pressure re-checked. Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

8 PD BR.. Product Data Doc. No. Y0 (EN - Rev. 00) May 0 Rubber mounting for suspension equalisation Function Rubber mounts are used in mechanically suspended tandem bogies to get an elastic connection between the axles. The arrangement as shown below, averages the movements of both axles. Installation recommendation Use the tandem axle mounting kit K00 (see drawing) to connect the linkage of the Load Sensing Valve to the axles. Attach mounting brackets to the axles for the rubber mountings ( A and B ). The rubber mountings are connected to each other using a tube or angle section link D. Part C provides an attachment point on link D for the Load Sensing Valve linkage. L A L/ C 0 Øx D B 90 Axle M0 Ø Ø M0 Axle 70 K00* = A + B + C 0 0 A B C Note: Item D is not supplied by Knorr-Bremse and must be manufactured by the installer to the necessary dimensions. ) The part number will carry a suffix N00 which defines that it is supplied without packaging. For further information contact your Knorr-Bremse distributor. Servicing The Load Sensing Valves BR and BR70 are not serviceable. Revision Details Rev. 00 October 0 Correction - details of Port - added to diagrams, Part Nos. for data plate and tandem axle linkage kit updated Rev. 00 March 0 Important Note added to page. Rev. 00 May 0 Replaced valves removed. Text amended to cover use in more catalogues. Knorr-Bremse Systeme für Nutzfahrzeuge GmbH. Moosacher Straße Munich. Germany. Tel: Fax:

Weight Stroke TÜV-Inspection approx. [kg] II )4) BZ M16x Port threads:

Weight Stroke TÜV-Inspection approx. [kg] II )4) BZ M16x Port threads: Commercial Vehicle Systems Product DATA Spring Brakes (S-cam), diaphragm/piston Doc. No. Y1137 (EN - Rev. 5) September 216 PD-413-1 Function This range of Spring Brakes is used on axles fitted with drum