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Air Braking Equipment

for Towed Vehicles in Accordance with Council Directive 71/320/ EEC Diagrammatic Views and Description of Braking Systems

and Air Braking Equipment

2. Edition

This publication is not subject to any update service.

New versions are available in INFORM at

https://www.doczj.com/doc/497387221.html,

Copyright WABCO 2004

Vehicle Control Systems

An American Standard Company

The right of amendment is reserved

Version 002/07.03

Wabcodruck 815 010 034 3

Table of Contents

2Page

1.Graphic symbols4

2.Identification of Port Connections19

3.Recommendations for Installation for

fitting standard braking systems to RREG21

4.Description of Components35

Please note:

For Trailer ABS ”VARIO-C“, see brochures 815 000 163 3 For Vario Compact ABS ”VCS“, see brochures 815 000 242 3 and VCS II815 000 426 3 Trailer EBS, see brochure 815 000 298 3 Trailer EBS D, see brochure 815 000 420 3

2

WABCO

The right partner - to be on the safe side To bring safety to our roads - this has been WABCO’s objective for decades. Through continuing technical in-novations in the research, development and manu- fac-turing processes, we have today achieved a leading position in many market segments of pneumatic and electronic systems for commercial vehicles.

Intelligent solutions for practical operation

One example for the successful synthesis of the elec-tronics and pneumatics sectors is WABCO’s ABS brak-ing system which has for years proved its worth in actual operation and which is being used by leading interna-tional manufacturers of commercial vehicles today. The drive-slip control system, ASR, is another feature which people have now come to expect in modern com-mercial vehicles.

In the electronics sector, WABCO’s product range also focuses on transmission controls, on air suspension sys-tems (ECAS) for lorries and trailers, and on heating, air conditioning and ventilation controls. And in the me-chanical/pneumatics sector WABCO has made a name for itself in compressed-air and air/hydraulic braking sys-tems, compressors, door actuators and coupling con-trols.Success through international commitment WABCO forms an important part in a group of compa-nies successfully operating all over the world. There are WABCO companies in Germany, Austria, Switzerland, France, the Benelux countries, Great Britain, Sweden, Italy, Spain and Brazil, and we are maintaining cooper-ating companies and joint ventures in Japan, India, and the USA. In addition to these interlinked companies, WABCO offers a comprehensive network of sales out-lets and workshops.

WABCO Service with a capital ‘S’

A staff of close to 6,000 people ensure constant availa-bility of service and proximity to our customers. This in-cludes both the reliable supply with genuine WABCO spares for retro-fitting and repairs, and competent sup-port and advice. And of course we also offer technical training on location.

Our world-wide commitment has made us one of the leading firms in the industry. It is through the compe-tence and dedication of our staff that WABCO today has a prominent position in the industry. A position which we intend to not only maintain but to strengthen further. With reliability, safety, quality and service, WABCO is your partner for the future.

2

3

Graphic and functional symbols correspond with German Standards DIN 74 253, Mai 1979 Edition, and DIN ISO 1210, August 1978 Edition.

The graphic symbols (DIN 74 253) can be used for dia-grammatic views of braking systems (plans of installa-tion) in motor vehicles.

The connections at the symbols have been marked in ac-cordance with DIN ISO 6786, December 1981 Edition. These markings are not strictly part of the symbols but can be used additionally for the purpose of clarification. The functional symbols (DIN ISO 1219) are designed to show the internal functions of the units or parts thereof.They consist of one or more basic symbols and normally of one or more functional symbols.

In circuit diagrams, the units are shown in their off posi-tion or in the neutral position of the control. If this is not the case, this is mentioned specifically (e. g. operating position).

Please note:

The graphic and functional symbols shown on Pages 5 to 18 are extracted from the respective DIN Standards. Only those symbols required for towed vehicles are shown.

Graphic Symbols 1.

2

4

Basic Symbols 1.

5

1.

Basic Symbols

6

Basic Symbols 1.

7

1.

Basic Symbols and Valves

8

Valves 1.

9

1.

Valves

10

Valves 1.

11

1.

Valves

12

Valves 1.

13

1.

Valves

14

Cylinders 1.

15

1.

Cylinders

16

Reservoirs, Filters and Shut–Off Valves 1.

17

1.

Hose Couplings, Switches,

Other Accessories

18

On Units in Air Braking Systems in accordance with DIN ISO 6786

For marking the port connections of units of compressed air braking systems, a standards sheet was compiled in the FAKRA and in the ISO which was published in De-cember, 1981 as a Standard under number DIN ISO 6786.

This Standard contains DIN 74 254, 04.1976 Edition, into which the International Standard ISO 6786, 06.1980 Edi-tion was incorporated without any alterations.

We are already gradually introducing these new mark-ings, initially for new designs and when making replace-ment casting moulds.

The main characteristics of the Standard are that the connections on the unit

–are expressed in figures and not in letters. The reason for this is to prevent letters being misinterpreted in other countries.

–are not to be numbered consequtively but that the identification digits of the connection provide informa-tion on the funcion of the unit's connection.

The identification code consists of a one or two digit number. The first digits mean:

0Suction connection

1Energy supply

2Energy delivery (not to atmosphere, see Digit 3)

3Exhaust

4Pilot connection (entry into unit)

5Spare

6Spare

7Anti-freeze liquid connection

8Lubricating oil connection

9Cooling liquid connection A second digit may be added when several similar port connections are available, for example in the case of split systems. The function represented by this second digit is left to the discretion of the vehicle manufacturer but should start at 1 and continue consecutively, for example 21, 22, 23, etc. Exceptions are permitted when applying the ”building block“ principle.

The following codes are not available for free choice: 71Anti-freeze inlet 72 Anti-freeze outlet

81Lubricating oil inlet 82 Lubricating oil outlet 91Cooling liquid inlet92 Cooling liquid outlet If there are a number of similar connections belonging to one unit and intended to fulfil the same function, they shall have the same designation.

A connection which can fulfil, in any one application, more than one function, shall be identified by two (first) digits. These shall be separated by a dash (see example on next page).

A connection which can fulfil more than one function in different applications shall be identified in accordance with agreement between the manufacturer and the cus-tomer (for example multiway valves).

The digits designated shall be placed close to the ports on the units and can also be placed in the braking system diagram next to the identified line connections. They ap-ply to air braking systems in motor vehicles, including those in which the transfer is in part hydraulic, and their towed vehicles.

Identification of Port Connections 2.

} for compressor

19

20

In this example, the references signify:

1Energy supply from the compressor

1-2Energy supply using a valve for filling the air braking system, and energy delivery by use of a valve as used for inflating tyres 3Connection to atmosphere (venting)

21Energy delivery to the energy accumulator (air reservoir)22

Energy delivery (switching connection)

Identification of Port Connections

2.

As an example, DIN ISO 6786 shows an unloader

valve with filling and switching connections.

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